Oscillations in an acoustooptic bistable device

Chrostowski, J.; Delisle, Claude; Tremblay, R.

doi:10.1139/p83-025

Cited by 22 publications

(13 citation statements)

References 2 publications

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“…under the condition A =0 as ( Tm) ._. _ n7r , (7) non ~ 1-Tr Tr where n is odd. As ,cl is increased further, each self oscillation at GDn (n-th harmonic oscillation) exhibits successive period-doubling bifurcations.…”

Section: Eigen Frequencies Of the Systemmentioning

confidence: 99%

“…7(a) shows the relation between relative phase and injection signal frequency for the (7,2) mode oscillation in the frequency-10cking state, where the waveforms of the injection signal and the oscillation were sinusoidal and rectangular, respectively, as shown in Fig. 7(b).…”

Section: First-harmonic Lockingmentioning

confidence: 99%

“…Dependence of lock-range for frame pulse injection on frame pulse width. Small black and white squares indicate data for(7,1) and(7, 2)mode oscillations, respectively. Oscillation and frame pulse amplitudes for (7, 1) mode locking are v ~:~3.0 Vp_p and vp ~~35 mVpp, respectively.…”

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confidence: 99%

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Effects of Small Signal Injection on Laser Diode Pumped Hybrid Bistable System with Large Delay

Aida

Iino

1995

OPT REV

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Hybrid BistableEffects of small signal injection on an electro-optical bistable system with a very large delay are theoretically and experimentally investigated from the viewpoint of linear stability analysis. The resonance phenomena and frequency locking are observed when sinusoidal and rectangular small signals are additively injected into the system. Experiments confirm that theoretical results obtained by linear stability analysis are good predictions of the effects of both resonance and frequency-10cking phenomena and show the dependence of these phenomena on the system parameters. As an application 0L the frequency locking phenomenon to the dynamical memory, the phase identification of the memory oscillation using the frame pulse externally injected is successfully executed.

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Section: Eigen Frequencies Of the Systemmentioning

confidence: 99%

Section: First-harmonic Lockingmentioning

confidence: 99%

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Effects of Small Signal Injection on Laser Diode Pumped Hybrid Bistable System with Large Delay

Aida

Iino

1995

OPT REV

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“…A plot of the first order intensity (I 1 ) versus the bias inputα 0 yields the well known bistable and hysteretic behavior. 3,4 The bistability and hysteresis characteristics depend strongly on the feedback gain (β), the feedback time delay (TD), and the amplitude (I inc ) of the incident 0091-3286/2011/$25.00 C 2011 SPIE light. In this paper, we specifically focus on the behavior of the diffracted first-order light under feedback, operating in the chaotic regime, with or without (RF) signal modulation.…”

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Examination of chaotic signal encryption and recovery for secure communication using hybrid acousto-optic feedback

Chatterjee

Alsaedi

2011

Opt. Eng

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Generation of chaos from acousto-optic (A-O)Bragg cell modulators with an electronic feedback has been studied for over 3 decades. Since an acousto-optic Bragg cell with zeroth-and first-order feedback exhibits chaotic behavior past the threshold for bistability, such a system was recently examined for possible chaotic encryption of simple messages (such as a low-amplitude sinusoidal signal) applied via the bias input of the sound cell driver. Subsequent recovery of the message signal was carried out via a heterodyne-type strategy employing a locally generated chaotic carrier, with threshold parameters matched to the transmitting Bragg cell. In this paper, we present numerical results and detailed interpretations for signal encryption and recovery under hybrid A-O electronic feedback using a heterodyne strategy. Important features of this setup, such as the system robustness in terms of parameter matching (feedback gain, dc bias, and time delay) are also examined in some detail. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). IntroductionIn an acousto-optic (A-O) modulator, an RF signal applied to a piezo-electric transducer, bonded to a suitable crystal, will generate an acoustic wave. It is well known that the acoustic wave acts like a "phase grating" that diffracts any incident laser beam into a number of diffracted orders. The Raman-Nath regime is characterized by multiple scattered orders while in the Bragg regime there are typically only two scattered orders (zeroth-and first-orders). 1 Around 1978, it was reported that A-O devices with positive feedback gain exhibit bistability characteristics. 2 In an A-O device, the amplitude of the diffracted fields that operate in the Bragg regime, i.e., the zeroth-and first-orders, which appear at the output of the Bragg cell, are related through a set of coupled differential equations. In Refs. 3 and 4, Chrostowski and co-workers present experimental results for A-O bistability and chaos using an equivalent circuit model of the Bragg cell with feedback. In a standard setup, a Bragg cell is driven by an ultrasonic sound wave from an RF generator at 40 MHz, and the resulting sound grating diffracts an incident He-Ne laser beam into the first Bragg order under Bragg condition. The first-order is then picked up by a linear photodetector, fed to an amplifier, and then returned to the bias input of the RF generator. The arrangement is shown in Fig. 1. Nominally, the scattered light beam is intrinsically frequency or phase modulated (with the acoustic frequency). In typical waveform sources, the external bias input amplitude modulates the RF waveform. A plot of the first order intensity (I 1 ) versus the bias inputα 0 yields the well known bistable and hysteretic behavior. 3,4 The bistability and hysteresis characteristics depend strongly on the feedback gain (β), the feedback time delay (TD), and the amplitude (I inc ) of the incident

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Experimental examination of frequency locking effect in acousto-optic system

Манцевич

Balakshy

2018

Appl. Phys. B

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Oscillations in an acoustooptic bistable device

Abstract: A study of an acoustooptic bistable device operating as a self-sustained generator is presented. The frequency of oscillation can be altered by an external voltage.

Cited by 22 publications

References 2 publications

Effects of Small Signal Injection on Laser Diode Pumped Hybrid Bistable System with Large Delay

Effects of Small Signal Injection on Laser Diode Pumped Hybrid Bistable System with Large Delay

Examination of chaotic signal encryption and recovery for secure communication using hybrid acousto-optic feedback

Experimental examination of frequency locking effect in acousto-optic system

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