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Articles 31  60 of 113
FullText Articles in Physics
Secure Transmission And Retrieval Of Images In Conjunction With Steganography Using Chaos In Nonlinear AcoustoOptic Feedback, Monish Ranjan Chatterjee, Fares S. Almehmadi
Secure Transmission And Retrieval Of Images In Conjunction With Steganography Using Chaos In Nonlinear AcoustoOptic Feedback, Monish Ranjan Chatterjee, Fares S. Almehmadi
Monish R. Chatterjee
Digital images are encrypted onto a chaotic carrier in a Bragg cell under hybrid nonlinear feedback and secure data is embedded into the system via steganography. System robustness (with and without channel noise) is analyzed visavis information security.
Numerical Examination Of The Nonlinear Dynamics Of A Hybrid AcoustoOptic Bragg Cell With Positive Feedback Under Profiled Beam Propagation, Fares S. Almehmadi, Monish Ranjan Chatterjee
Numerical Examination Of The Nonlinear Dynamics Of A Hybrid AcoustoOptic Bragg Cell With Positive Feedback Under Profiled Beam Propagation, Fares S. Almehmadi, Monish Ranjan Chatterjee
Monish R. Chatterjee
In standard weak interaction theory, acoustooptic Bragg analysis typically assumes that the incident light and sound beams are uniform plane waves. Acoustooptic Bragg diffraction with nonuniform profiled input beams is numerically examined under open loop via a transfer function formalism. Unexpected deviations in the firstorder diffracted beam from the standard theory are observed for high 𝑄 values. These deviations are significant because the corresponding closedloop system is sensitive to input amplitudes and initial conditions, and the overall impact on the dynamical behavior has not been studied previously in standard analyses. To explore the effect of such nonuniform output profiles on ...
Numerical Examination Of AcoustoOptic Bragg Interactions For Profiled Lightwaves Using A Transfer Function Formalism, Monish Ranjan Chatterjee, Fares S. Almehmadi
Numerical Examination Of AcoustoOptic Bragg Interactions For Profiled Lightwaves Using A Transfer Function Formalism, Monish Ranjan Chatterjee, Fares S. Almehmadi
Monish R. Chatterjee
Classically, acoustooptic (AO) interactions comprise scattering of photons by energetic phonons into higher and lower orders. Standard weak interaction theory describes diffraction in the Bragg regime as the propagation of a uniform plane wave of light through a uniform plane wave of sound, resulting in the wellknown first and zerothorder diffraction. Our preliminary investigation of the nature of wave diffraction and photon scattering from a Bragg cell under intensity feedback with profiled light beams indicates that the diffracted (upshifted photon) light continues to maintain the expected (uniform plane wave) behavior versus the optical phase shift in the cell within a ...
Numerical Investigation Of The Nonlinear Dynamics Of A Hybrid AcoustoOptic Bragg Cell With A Variable Feedback Gain, Monish Ranjan Chatterjee, Hao Zhou
Numerical Investigation Of The Nonlinear Dynamics Of A Hybrid AcoustoOptic Bragg Cell With A Variable Feedback Gain, Monish Ranjan Chatterjee, Hao Zhou
Monish R. Chatterjee
Since around 1979, the operation of an acoustooptic Bragg cell under positive firstorder feedback via amplification and delay in the loop has been studied extensively by several groups [13]. In recent work, the analysis of the nonlinear dynamics (NLD) of the system was extended to include bistable maps and Lyapunov exponents, and application of the chaos for signal encryption and decryption for uniform plane waves. The present work originated with the problem of a variable photodetector aperture opening relative to the firstorder light. This potentially complex problem is simplified by assuming instead a variable feedback gain ( β ~ (t)), which leads ...
Numerical Inversion And Assessment Of 2d Laplace Transforms Using The Brancik Algorithm And Its Use In 3d Holography, Monish Ranjan Chatterjee, Le Feng
Numerical Inversion And Assessment Of 2d Laplace Transforms Using The Brancik Algorithm And Its Use In 3d Holography, Monish Ranjan Chatterjee, Le Feng
Monish R. Chatterjee
An analytic examination of 3D holography under a 90° recording geometry was carried out earlier in which 2D spatial Laplace transforms were introduced in order to develop transfer functions for the scattered outputs under readout [1,2]. Thereby, the resulting reconstructed output was obtained in the 2D Laplace domain whence the spatial information would be found only by performing a 2D Laplace inversion. Laplace inversion in 2D was attempted by testing a prototype function for which the analytic result was known using two known inversion algorithms, viz., the Brancik and the Abate [2]. The results indicated notable differences in the ...
Performance Measures In AcoustoOptic Chaotic Signal Encryption System Subject To Parametric Variations And Additive Noise, Monish Ranjan Chatterjee, Anjan K. Ghosh, Mohammed A. AlSaedi
Performance Measures In AcoustoOptic Chaotic Signal Encryption System Subject To Parametric Variations And Additive Noise, Monish Ranjan Chatterjee, Anjan K. Ghosh, Mohammed A. AlSaedi
Monish R. Chatterjee
Signal encryption and recovery using chaotic optical waves has been a subject of active research in the past 10 years. Since an acoustooptic Bragg cell with zeroth and firstorder feedback exhibits chaotic behavior past the threshold for bistability, such a system was recently examined for possible chaotic encryption using a lowamplitude sinusoidal signal applied via the bias input of the sound cell driver. Subsequent recovery of the message signal was carried out via a heterodyne strategy employing a locally generated chaotic carrier, with threshold parameters matched to the transmitting Bragg cell. The simulation results, though encouraging, were limited to relatively ...
Numerical Analysis Of FirstOrder AcoustoOptic Bragg Diffraction Of Profiled Optical Beams Using OpenLoop Transfer Functions, Monish Ranjan Chatterjee, Fares S. Almehmadi
Numerical Analysis Of FirstOrder AcoustoOptic Bragg Diffraction Of Profiled Optical Beams Using OpenLoop Transfer Functions, Monish Ranjan Chatterjee, Fares S. Almehmadi
Monish R. Chatterjee
In standard acoustooptic Bragg analysis, the incident light and sound beams are assumed to be uniform plane waves (with constant profiles) leading to the results based on standard weak interaction theory. As a followup to earlier work dealing with nonuniform incident optical beams, we revisit the problem of Bragg diffraction under nonuniform profiles, and include Gaussian, thirdorder Hermite–Gaussian, and zerothorder Bessel profiles in our investigation, along with a few others. The firstorder diffracted beam is examined (using a transfer function formalism based on angular spectra) under several parametric limits [such as the Klein–Cook parameter Q, the effective profile ...
Nonlinear Dynamics Of BraggDomain AcoustoOptic Hybrid Feedback For FirstOrder Scattering Of Profiled Optical Beams, Monish Ranjan Chatterjee, Fares S. Almehmadi
Nonlinear Dynamics Of BraggDomain AcoustoOptic Hybrid Feedback For FirstOrder Scattering Of Profiled Optical Beams, Monish Ranjan Chatterjee, Fares S. Almehmadi
Monish R. Chatterjee
A series of recent studies involving hybrid acoustooptic (AO) scattering in the Bragg domain under firstorder feedback have shown the ability of the AO feedback system to encrypt, transmit and decrypt RF information applied via the sound driver. The basic premise of this operation is founded on the chaotic nature of the hybrid Bragg cell under feedback.
LargeArea Object Search And Recovery Using SectorBased Aerial AcoustoOptic Scanning And Reflection Sensing, Monish Ranjan Chatterjee, Salaheddeen G. Bugoffa
LargeArea Object Search And Recovery Using SectorBased Aerial AcoustoOptic Scanning And Reflection Sensing, Monish Ranjan Chatterjee, Salaheddeen G. Bugoffa
Monish R. Chatterjee
A sectorbased angular scanning system intended to identify and spatially locate relatively small objects scattered over a large terrain is described in this paper. The system is modeled as a planar surface on the horizontal (XY) plane, with an acoustooptic Bragg cell on board an unmanned aerial vehicle (UAV) operating in the XZ plane. The Bragg cell is excited by a chirped RF signal with a designed frequency ramp. As the scanning beam reflects off the horizontal surface, a detector placed strategically at a suitable altitude (in the analysis shown to be on board the UAV itself) picks up the ...
Negative Index In A Lossy Chiral Metamaterial Under FirstOrder Material Dispersion Using A Drude Model, Tarig A. Algadey, Monish Ranjan Chatterjee
Negative Index In A Lossy Chiral Metamaterial Under FirstOrder Material Dispersion Using A Drude Model, Tarig A. Algadey, Monish Ranjan Chatterjee
Monish R. Chatterjee
Using the Drude model for complex conductivity,phase and group velocities, and indices are calculated under firstorder dispersion in chiral metamaterials. Conditions are derived for negative index, and the results compared with parametric analyses.
Investigation Of Negative Refractive Index In Reciprocal Chiral Materials, Monish Ranjan Chatterjee, Partha P. Banerjee, Pradeep R. Anugula
Investigation Of Negative Refractive Index In Reciprocal Chiral Materials, Monish Ranjan Chatterjee, Partha P. Banerjee, Pradeep R. Anugula
Monish R. Chatterjee
It is well known that there exist both natural materials (such as milk or sugar solution) possessing chiral (or handed) properties, as well as an increasing list of manmade materials (such as sodium bromate) that exhibit chirality. One of the principal properties of chirality is that light of any arbitrary polarization, when propagating through a chiral material, splits up into two circular polarizations propagating in different directions. In the past decade or longer, researchers have investigated electromagnetic transverse (plane) wave propagation across a nonchiral/chiral interface, and determined the electromagnetic Fresnel coefficients for such propagation. Traditionally, such coefficients are derived ...
Modeling Of Power Spectral Density Of Modified Von Karman Atmospheric Phase Turbulence And AcoustoOptic Chaos Using Scattered Intensity Profiles Over Discrete Time Intervals, Monish Ranjan Chatterjee, Fathi H.A. Mohamed
Modeling Of Power Spectral Density Of Modified Von Karman Atmospheric Phase Turbulence And AcoustoOptic Chaos Using Scattered Intensity Profiles Over Discrete Time Intervals, Monish Ranjan Chatterjee, Fathi H.A. Mohamed
Monish R. Chatterjee
In recent research, propagation of plane electromagnetic (EM) waves through a turbulent medium with modified von Karman phase characteristics was modeled and numerically simulated using transverse planar apertures representing narrow phase turbulence along the propagation path. The case for extended turbulence was also studied by repeating the planar phase screens multiple times over the propagation path and incorporating diffractive effects via a splitstep algorithm. The goal of the research reported here is to examine two random phenomena: (a) atmospheric turbulence due to von Karmantype phase fluctuations, and (b) chaos generated in an acoustooptic (AO) Bragg cell under hybrid feedback. The ...
Investigation Of Profiled Beam Propagation Through A Turbulent Layer And Temporal Statistics Of Diffracted Output For A Modified Von Karman Phase Screen, Monish Ranjan Chatterjee, Fathi H.A. Mohamed
Investigation Of Profiled Beam Propagation Through A Turbulent Layer And Temporal Statistics Of Diffracted Output For A Modified Von Karman Phase Screen, Monish Ranjan Chatterjee, Fathi H.A. Mohamed
Monish R. Chatterjee
Gaussian beam propagation through a turbulent layer has been studied using a splitstep methodology. A modified von Karman spectrum (MVKS) model is used to describe the random behavior of the turbulent media. Accordingly, the beam is alternately propagated (i) through a thin Fresnel layer, and hence subjected to diffraction; and (ii) across a thin modified von Karman phase screen which is generated using the power spectral density (PSD) of the random phase obtained via the corresponding PSD of the medium refractive index for MVKS turbulence. The random phase screen in the transverse plane is generated from the phase PSD by ...
Investigation Of Negative Index In Dispersive, Chiral Materials Via ContraPropagating Velocities Under SecondOrder Dispersion (Gvd), Monish Ranjan Chatterjee, Tarig A. Algadey
Investigation Of Negative Index In Dispersive, Chiral Materials Via ContraPropagating Velocities Under SecondOrder Dispersion (Gvd), Monish Ranjan Chatterjee, Tarig A. Algadey
Monish R. Chatterjee
Negative refractive index arises typically in metamaterials via multiple routes. One such avenue is the condition where the Poynting vector of the electromagnetic wave is in opposition to the group velocity in the material. An earlier work along this route in a chiral material led to the wellknown result of requiring very large (nonrealizable) chirality. Thereafter, a combination of chirality together with firstorder dispersion was examined using plane wave electromagnetic analysis. To arrive at the conclusions in that approach, the three wave velocities (energy, group and phase) were derived under firstorder dispersion in permittivity, permeability and chirality. Negative index in ...
Information Encryption, Transmission, And Retrieval Via Chaotic Modulation In A Hybrid AcoustoOptic Bragg Cell Under Profiled Beam Illumination, Monish Ranjan Chatterjee, Fares S. Almehmadi
Information Encryption, Transmission, And Retrieval Via Chaotic Modulation In A Hybrid AcoustoOptic Bragg Cell Under Profiled Beam Illumination, Monish Ranjan Chatterjee, Fares S. Almehmadi
Monish R. Chatterjee
In recent work, the propagation of a profiled optical beam through an openloop acoustooptic Bragg cell was examined using a transfer function formalism. The device was also studied under closedloop via intensity feedback, and shown to exhibit more extended chaotic band responses, thereby potentially increasing the dynamic range and parameter sensitivities of any applied signal and the device operation respectively.
In this paper, simple low to midRF signals (periodic waveforms and low BW audio) are transmitted through the closedloop system and the resulting encryption and recovery at the receiver are examined especially from the perspective of overall robustness of the ...
Information Encryption And Retrieval In MidRf Range Using AcoustoOptic Chaos, Monish Ranjan Chatterjee, Abhinay Kundur
Information Encryption And Retrieval In MidRf Range Using AcoustoOptic Chaos, Monish Ranjan Chatterjee, Abhinay Kundur
Monish R. Chatterjee
In recent work, lowfrequency AC signal encryption, decryption and retrieval using systemparameter based keys at the receiver stage of an acoustooptic (AO) Bragg cell under firstorder feedback have been demonstrated [1,2]. The corresponding nonlinear dynamics have also been investigated using the Lyapunov exponent and the socalled bifurcation maps [3]. The results were essentially restricted to AO chaos around 10 KHz, and (baseband) signal bandwidths in the 14 KHz range. The results have generally been satisfactory, and parameter tolerances (prior to severe signal distortion at the output) in the ±5%  ±10% range have been obtained. Periodic AC waveforms, and a ...
Investigation Of Electromagnetic Velocities And Negative Refraction In A Chiral Metamaterial With SecondOrder Material Dispersion Using Spectral Analyses And Dispersive Models, Monish Ranjan Chatterjee, Tarig A. Algadey
Investigation Of Electromagnetic Velocities And Negative Refraction In A Chiral Metamaterial With SecondOrder Material Dispersion Using Spectral Analyses And Dispersive Models, Monish Ranjan Chatterjee, Tarig A. Algadey
Monish R. Chatterjee
In recent years, considerable research has been carried out relative to the electromagnetic (EM) propagation and refraction characteristics in metamaterials with emphasis on the origins of negative refractive index.
Negative refractive index may be introduced in metamaterials via different methods; one such is the condition whereby the Poynting vector of the EM wave is in opposition to the group velocity in the material. Alternatively, negative refractive index also occurs when the group and phase velocities in the medium are in opposition. The latter phenomenon has been extensively investigated in the literature, including recent work involving chiral metamaterials with material dispersion ...
Investigation Of Electronic Holography Using Spice Computer Simulation Experiments, Monish Ranjan Chatterjee
Investigation Of Electronic Holography Using Spice Computer Simulation Experiments, Monish Ranjan Chatterjee
Monish R. Chatterjee
Using SPICE experiments, it has been possible to verify most of the important aspects of electronic holography. The generation and properties of dynamic echoes under different types of nonlinearities have been extensively tested, and some new information has been garnered in the process. The case of pulse and generalized memory echoes has also been tested, and the results have been fairly satisfactory. Most of all, the simplicity with which the intriguing concept of memory echoes has translated into the circuit implementation on SPICE, and the closeness of the results to predicted behavior have been somewhat of a pleasant surprise. Since ...
Feedback Correction Of Angular Error In Grating Readout, Monish Ranjan Chatterjee, Sundaram Ramachandran
Feedback Correction Of Angular Error In Grating Readout, Monish Ranjan Chatterjee, Sundaram Ramachandran
Monish R. Chatterjee
Angular and wavelength READ beam errors in holographic interconnection systems are often a recurrent problem. Several strategies have been proposed to minimize or eliminate such READOUT misalignments. Some years ago, Chatterjee and coworkers proposed a method involving READ beam wavelength tuning to correct output angular errors. In this paper, we investigate the possibility of using an acoustooptic (AO) Bragg cell with optoelectronic feedback to dynamically correct the scattered beam for deviations in the incidence direction of the READ beam of a hologram. The concept here is based on an acoustic frequency feedback strategy used recently by Balakshy and Kazaryan for ...
Improved Performance Of Analog And Digital AcoustoOptic Modulation With Feedback Under Profiled Beam Propagation For Secure Communication Using Chaos, Fares S. Almehmadi, Monish Ranjan Chatterjee
Improved Performance Of Analog And Digital AcoustoOptic Modulation With Feedback Under Profiled Beam Propagation For Secure Communication Using Chaos, Fares S. Almehmadi, Monish Ranjan Chatterjee
Monish R. Chatterjee
Using intensity feedback, the closedloop behavior of an acoustooptic hybrid device under profiled beam propagation has been recently shown to exhibit wider chaotic bands potentially leading to an increase in both the dynamic range and sensitivity to key parameters that characterize the encryption. In this work, a detailed examination is carried out visàvis the robustness of the encryption/decryption process relative to parameter mismatch for both analog and pulse code modulation signals, and bit error rate (BER) curves are used to examine the impact of additive white noise. The simulations with profiled input beams are shown to produce a stronger ...
Diffractive Propagation And Recovery Of Modulated (Including Chaotic) Electromagnetic Waves Through Uniform Atmosphere And Modified Von Karman Phase Turbulence, Monish Ranjan Chatterjee, Fathi H.A. Mohamed
Diffractive Propagation And Recovery Of Modulated (Including Chaotic) Electromagnetic Waves Through Uniform Atmosphere And Modified Von Karman Phase Turbulence, Monish Ranjan Chatterjee, Fathi H.A. Mohamed
Monish R. Chatterjee
In a parallel approach to recentlyused transfer function formalism, a study involving diffraction of modulated electromagnetic (EM) waves through uniform and phaseturbulent atmospheres is reported in this paper. Specifically, the input wave is treated as a modulated optical carrier, represented by use of a sinusoidal phasor with a slowly timevarying envelope. Using phasors and (spatial) Fourier transforms, the complex phasor wave is transmitted across a uniform or turbulent medium using the KirchhoffFresnel integral and the random phase screen. Some preliminary results are presented comparing nonchaotic and chaotic information transmission through turbulence, outlining possible improvement in performance utilizing the robust features ...
Examination Of Energy And Group Velocities In Positive And Negative Index Chiral Materials With And Without Dispersion, Monish Ranjan Chatterjee, Partha P. Banerjee
Examination Of Energy And Group Velocities In Positive And Negative Index Chiral Materials With And Without Dispersion, Monish Ranjan Chatterjee, Partha P. Banerjee
Monish R. Chatterjee
Concepts of energy and group velocities, Poynting and propagation vectors are examined for both positive and negative index materials. Known definitions for these entities are explored in terms of the interplay of chirality and dispersion.
Analysis Of Beam Propagation In 90Degree Holographic Recording And Readout Using Transfer Functions And Numerical 2DLaplace Inversion, Monish Ranjan Chatterjee, Partha P. Banerjee, George Nehmetallah
Analysis Of Beam Propagation In 90Degree Holographic Recording And Readout Using Transfer Functions And Numerical 2DLaplace Inversion, Monish Ranjan Chatterjee, Partha P. Banerjee, George Nehmetallah
Monish R. Chatterjee
Recently, 2DLaplace analysis of recording and readout of edgeholograms was reported. Numerical Laplace inversion was examined for simple test cases. Inversion algorithms are applied to examine beam shaping and distortion in photovoltaic and photorefractive materials.
Electronic Simulation Of The Temporal Characteristics Of Photon Memory Echoes And Some Related Applications, Yuwen Kuo, Monish Ranjan Chatterjee
Electronic Simulation Of The Temporal Characteristics Of Photon Memory Echoes And Some Related Applications, Yuwen Kuo, Monish Ranjan Chatterjee
Monish R. Chatterjee
The characteristics of nonlinear photon memory echoes are investigated by means of SPICE simulations using equivalent resonator ensembles. By developing implicit nonlinear circuit models in the memory echo domain, the triple product formalism of electronic holography, involving correlation and convolution, is tested for the storage and recall of arbitrary signals and/or data bit streams in both timeinverted and nontimeinverted modes. Furthermore, a few specific optical data processing applications are also simulated in which the mixed binary multiplication of two or more binary bit streams is achieved.
Higher order products, optical pattern recognition, and other possible applications are also discussed ...
Design Of AcoustoOptic Chaos Based Secure FreeSpace Optical Communication Links, Anjan K. Ghosh, Pramode K. Verma, Samuel Cheng, Robert C. Huck, Monish Ranjan Chatterjee, Mohammed A. AlSaedi
Design Of AcoustoOptic Chaos Based Secure FreeSpace Optical Communication Links, Anjan K. Ghosh, Pramode K. Verma, Samuel Cheng, Robert C. Huck, Monish Ranjan Chatterjee, Mohammed A. AlSaedi
Monish R. Chatterjee
We discuss the design of an acoustooptic cell based free space optical communication link where the data beam is made secure through chaos encryption. Using external signal modulation of the diffracted light from a hybrid acoustooptic cell chaos (or directly via incorporation in the soundcell driver's bias voltage) encryption of data is possible. We have shown numerically that decryption of the encoded data is possible by using an identical acoustooptic system in the receiver.
Emergence Of Negative Index In A Lossy Chiral Metamaterial Under FirstOrder Material Dispersion, Monish Ranjan Chatterjee, Tarig A. Algadey
Emergence Of Negative Index In A Lossy Chiral Metamaterial Under FirstOrder Material Dispersion, Monish Ranjan Chatterjee, Tarig A. Algadey
Monish R. Chatterjee
For a lossless dispersive chiral material, negative index (NIM) occurred only by use of parametric analysis (and not via practical models) to firstorder. These findings are revisited for the lossy problem and the results are compared.
Examination Of The Nonlinear Dynamics Of A Chaotic AcoustoOptic Bragg Modulator With Feedback Under Signal Encryption And Decryption, Mohammed A. AlSaedi, Monish Ranjan Chatterjee
Examination Of The Nonlinear Dynamics Of A Chaotic AcoustoOptic Bragg Modulator With Feedback Under Signal Encryption And Decryption, Mohammed A. AlSaedi, Monish Ranjan Chatterjee
Monish R. Chatterjee
An acoustooptic Bragg cell with firstorder feedback, which exhibits chaotic behavior past the threshold for bistability, was recently examined for possible chaotic encryption and recovery of simple messages (such as lowamplitude periodic signals) applied via the bias input of the sound cell driver. We carry out a thorough examination of the nonlinear dynamics of the Bragg cell under intensity feedback for (i) dc variations of the feedback gain (β˜) and the phase shift parameter (α^ 0) and (ii) ac variations of α^ 0; total under signal encryption, investigating both from two different perspectives: (i) examining chaos in view of the ...
Examination Of Focused Beam Propagation Through A Finite NonReciprocal Planar Chiral Slab Using Complex Fresnel Coefficients And Dual Transforms, Monish Ranjan Chatterjee, Sumit Nema, Partha P. Banerjee
Examination Of Focused Beam Propagation Through A Finite NonReciprocal Planar Chiral Slab Using Complex Fresnel Coefficients And Dual Transforms, Monish Ranjan Chatterjee, Sumit Nema, Partha P. Banerjee
Monish R. Chatterjee
Recently, uniform plane wave propagation across a nonchiralchiral interface was examined via the development of appropriate Fresnel coefficients. In this extension, propagation of focused uniform and profiled beams through a finite, planar nonreciprocal chiral slab is investigated using complex Fresnel coefficients via angular plane wave decomposition and dual transforms.
Experimental Investigations Of Wavelength And Angular Errors In Holographic Gratings With NonBraggMatched Read Beams, Monish Ranjan Chatterjee, Vivek Ray
Experimental Investigations Of Wavelength And Angular Errors In Holographic Gratings With NonBraggMatched Read Beams, Monish Ranjan Chatterjee, Vivek Ray
Monish R. Chatterjee
Perfect Bragg matching is generally desirable for accurate optical interconnections with holographic gratings. In reality, however, gratings may be illuminated by READ beams with nonBraggmatched angles, or wavelengths, or both. In such cases, the scattered beams are generally misdirected, and may suffer loss of efficiency and possibly more serious errors such as crosstalk noise or missed connections. A conventional wavevector triad method of analyzing the scattered beam errors leads readily to nearBragg estimates of the output angular misalignment. However, the READ wavevector triads appear to indicate a possible wavelength shift in the output beam even with a Braggmatched READ wavelength ...
Examination Of Beam Propagation In Misaligned Holographic Gratings And Comparison With The AcoustoOptic Transfer Function Model For Profiled Beams, Monish Ranjan Chatterjee, David D. Reagan
Examination Of Beam Propagation In Misaligned Holographic Gratings And Comparison With The AcoustoOptic Transfer Function Model For Profiled Beams, Monish Ranjan Chatterjee, David D. Reagan
Monish R. Chatterjee
A transfer function formalism developed earlier for the propagation of profiled optical beams through acoustooptic Bragg cells is revisited and applied to a thick holographic grating. The results based on the holographic coupled wave model and the acoustooptic multiple scattering model are shown to be compatible, and equivalent parameters such as the Q and grating strength are defined for the two systems. Results for a Gaussian spatial profile are numerically computed and compared. For the holographic grating, a profiled beam may be interpreted as an angular misalignment or Braggangle mismatch problem. The case of Braggwavelength mismatch is also investigated for ...