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Wide-Angle Polarization-Independent Paratellurite-Based Acousto-Optic Laser Radiation Modulator
摘要： High-efficiency wide-angle polarization-independent acousto-optic diffraction of laser radiation in a paratellurite-based modulator is experimentally studied. The previously published main theoretical principles are confirmed. We have shown that the angular aperture of the acousto-optic modulator can be ~8° in an ultrasonic frequency range of 135–68 MHz depending on the light wavelength and 2°–5° in the range of 20–30 MHz. A wide-angle acousto-optic depolarized laser radiation modulator has been created that operates at a wavelength λ = 1.06 μ m with one output depolarized beam and an efficiency of no less than 90% for input radiation with an angular aperture of 30 mrad.
关键词： light polarization,angular diffraction range,anisotropic acousto-optic diffraction,acousto-optic modulator
更新于2025-09-23 15:19:57
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Laser frequency shift up to 5 GHz with a high-efficiency 12-pass 350-MHz acousto-optic modulator
摘要： We demonstrate a novel laser frequency shift scheme using a 12-pass 350-MHz acousto-optic modulator (AOM). This AOM system shows better performance compared to ordinary acousto-optic modulation schemes. The frequency of the incident laser beam is shifted by 4.2 GHz with the total diffraction efficiency as high as 11%, and the maximum frequency shift is 5 GHz. Combining the ±1st order diffraction, laser signals with up to 10 GHz frequency difference can be obtained, which fulfill most frequency shift requirements of laser cooling and coherent manipulation experiments with alkali metal atoms.
关键词： frequency stability,diffraction efficiency,acousto-optic modulator,multi-pass AOM,laser frequency shift
更新于2025-09-23 15:19:57
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[IEEE 2019 Wave Electronics and its Application in Information and Telecommunication Systems (WECONF) - Saint-Petersburg, Russia (2019.6.3-2019.6.7)] 2019 Wave Electronics and its Application in Information and Telecommunication Systems (WECONF) - Electronic Retuning of Acousto-Optic Laser Mode Locker. Experimental study
摘要： The effect of electronic retuning of acoustic resonances in an acousto-optic laser mode locker is investigated theoretically and experimentally. In the approximation of plane acoustic waves, the problem of excitation of the Fabry–Perot acoustic resonator by a plate piezoelectric transducer is solved with taking into account real parameters of a RF generator and matching elements. The resonances were retuned by changing reactive matching elements (inductance coil and capacitor) connected between the generator and the transducer. In the experiment, an acousto-optic cell made of crystalline quartz with a two-sectional lithium niobate transducer was used.
关键词： acoustic Fabry–Perot resonator,piezoelectric transducer,acousto-optic modulator,acousto-optic interaction,laser mode locking
更新于2025-09-11 14:15:04
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Ultra-low noise optical injection locking amplifier with AOM-based coherent detection scheme
摘要： A novel optical injection locking amplifier with acousto-optic modulator based phase modulation and a coherent detection scheme for optical frequency transfer applications is experimentally demonstrated in this study. A commercial distributed feedback diode laser is injection-locked to the resonant frequency of the optical signal with an optical fiber path length of hundreds of kilometers. This provides approximately 59 dB gain and ensures that the input carrier frequency fractional stability can be as good as 10?20 at 1000 s. The amplifier was tested for the transfer of a commercial narrow-linewidth laser in a 180 km fiber link to a remote site with only a single amplification step. The transferred frequency at the remote end reached 10?20 at 20000 s, which is suitable for optical frequency distribution and remote comparison between optical atomic clocks.
关键词： acousto-optic modulator,optical injection locking amplifier,optical frequency transfer,coherent detection
更新于2025-09-09 09:28:46