Acousto-optic wide band optical low-frequency shifter

Dieulangard, Anthony; Kastelik, Jean‐Claude; Dupont, Samuel; Gazalet, Joseph

doi:10.1364/ao.52.008134

Cited by 4 publications

(2 citation statements)

References 28 publications

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“…As seen below, this represents the perfect TPM configuration. In AOD applications, a larger frequency bandwidth can be established modifying the incident optical beam angle which creates a midband mismatch with different ripple criteria, depending on the angle tilt [9]. Similar ripple criteria can be obtained on the spectral bandwidth according to an appropriate couple (θ , f ).…”

Section: Acousto-optical Grating Beam Splitter Designmentioning

confidence: 99%

Acousto-optical tunable transmissive grating beam splitter

et al. 2014

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We present a tunable transmissive grating beam splitter for multiple laser line separation based on acousto-optic interaction in tellurium dioxide. Acousto-optic devices are well known for light modulation, frequency shifting, filtration or deflection. For a deflector, the incident light beam is monochromatic and the angular deviation is proportional to the ultrasonic frequency excursion. For a tunable filter, the selected wavelength is determined by the ultrasonic frequency. Several wavelengths may be simultaneously diffracted using several associated ultrasonic frequencies and all the diffracted beams have the same angular deviation. Unlike the classical operating modes of acousto-optic devices, we consider the simultaneous diffraction of several optical wavelengths by a single ultrasonic frequency. The device is based on Bragg anisotropic interaction in the specific "Tangent Phase Matching" configuration. The acousto-optic interaction takes place with a single ultrasonic frequency and the diffraction efficiency remains high over a wide optical spectral range. The different diffracted beams are then angularly well separated, due to the slow velocity of the ultrasonic wave propagating in tellurium dioxide. The optical bandwidth is directly related to the operating ultrasonic frequency. Numerical calculations were carried out to determine the main parameters of the device: operating ultrasonic frequency, optical bandwidth, tunability range, crystalline cut and transducer length. A practical device has been designed for visible spectrum. Experimental results will be presented as for example a spectral bandwidth from 450 nm to 550 nm with a RF carrier frequency f = 125 MHz.

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Section: Acousto-optical Grating Beam Splitter Designmentioning

confidence: 99%

Acousto-optical tunable transmissive grating beam splitter

et al. 2014

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“…If the frequencies of two RF drive signals are different, the structure can also achieve a small frequency shift of the output light. Dieulandard et al [23] studied a tunable low-frequency optical frequency shifter, which is also based on the series connection of two acousto-optic crystals, and the final operation tuning range is extended to 42 MHz. Wang et al [24] designed a low-frequency polarization maintaining fiber acousto-optic frequency shifter with a frequency shift of 10 MHz and an insertion loss of 3.3 dB.…”

Section: Introductionmentioning

confidence: 99%

Double-Frequency-Shift Acousto-Optic Modulator with Controllable Pulse Pair Frequency Difference

et al. 2021

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A scheme for controlling the frequency difference of output pulse pair with double frequency shift loops is proposed. The frequency shift system includes two loop elements of 20 and 200 MHz. The first one carries out a single selective positive frequency shift of 1–20 MHz, and the second one can satisfy a single fixed positive frequency shift of 200 MHz. The reverse cascade technology of two acousto-optic crystals is introduced to solve the limitation of the small frequency shift of crystal size. A multichannel synchronization signal completes the time domain control of each acousto-optic modulator. Finally, the frequency shift difference of the output pulse pair ranges of 0–2 GHz, and the frequency shift accuracy is 5 MHz.

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Heterodyne phase measurement in low signal-to-noise ratios using genetic algorithm

Dong

Yang

et al. 2019

Optics Communications

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Acousto-optic wide band optical low-frequency shifter

Cited by 4 publications

References 28 publications

Acousto-optical tunable transmissive grating beam splitter

Acousto-optical tunable transmissive grating beam splitter

Double-Frequency-Shift Acousto-Optic Modulator with Controllable Pulse Pair Frequency Difference

Heterodyne phase measurement in low signal-to-noise ratios using genetic algorithm

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