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Generation of dual and quad‑optical frequency combs in the injected radiation free mode‑locked frequency‑shifted feedback laser

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Frontiers of Optoelectronics 2023年第3期16卷 43-56页

作者： Sergey N.Mantsevich Ekaterina I.Kostyleva Andrey N.Danilin Vladimir S.Khorkin Physics Department M.V.Lomonosov Moscow State UniversityMoscow 119991Russia Russian Quantum Center(RQC) Skolkovo 143026Russia

The results of an optoelectronic system—frequency-shifted feedback(FSF)laser experimental examination are presented.The considered FSF laser is seeded only with optical amplifer spontaneous emission(ASE)and operates in the mode-locked regime,whereby the output radiation is sequence of short pulses with a repetition rate determined by the delay time in its optical feedback circuit.In the frequency domain,the spectrum of such a pulse sequence is an optical frequency comb(OFC).These OFCs we call initial.We consider the possibility of tunable acousto-optic(AO)dual and quad-comb frequency spacing downconversion in the FSF laser seeded with ASE and operating in the mode-locked regime.The examined system applies a single frequency shifting loop with single AO tunable flter as the frequency shifter that is fed with several radio frequency signals simultaneously.The initial OFCs with frequency spacing of about 6.5 MHz may be obtained in the wide spectral range and their width,envelope shape and position in the optical spectrum may be tuned.The dual-combs are obtained with a pair of initial OFCs aroused by two various ultrasound waves in the acousto-optic tunable flter(AOTF).The dual-combs frequency spacing is determined by the frequency diference of the signals applied to the AOTF piezoelectric transducer and can be tuned simply.The quad-combs are obtained with three initial OFCs,forming a pair of dual-combs,appearing when three ultrasound frequencies feed the AOTF transducer.The quad-combs frequency spacing is defned by the diference between the frequency spacing of dual-combs.Quad-combs with more than 5000 spectral lines and tunable frequency spacing are observed.The successive frequency downconversion gives the possibility to reduce the OFC frequency spacing form several MHz for initial OFC to tens of kHz for quad-combs.

关键词： Frequency-shifted feedback laser Optical frequency combs acousto-optics Dual-combs Quad-combs

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Optical image processing using acousto-optic modulators as programmable volume holograms: a review [Invited]

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Chinese optics Letters 2022年第2期20卷 24-33页

作者：张亚萍范厚鑫潘定中 Yunnan Provincial Key Laboratory of Modern Information optics Kunming University of Science and TechnologyKunming 650500China The Bradley Department of Electrical and Computer Engineering Virginia TechBlacksburgVirginia 24061USA

Bragg processing using a volume hologram offers an alternative in optical image processing in contrast to Fourier-plane processing. By placing a volume hologram near the object in an optical imaging setup, we achieve Bragg processing. In this review, we discuss various image processing methods achievable with acousto-optic modulators as dynamic and programmable volume holograms. In particular, we concentrate on the discussion of various differentiation operations leading to edge extraction capabilities.

关键词： optical image processing edge extraction acousto-optics volume gratings

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Theoretical studies on optimum design of acousto-optic modulator using lithium niobate crystal

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Chinese optics Letters 2015年第13期13卷 52-54页

作者：庞兆广李洁高艳磊杨振军 College of Physics Science and Information Engineering Hebei Normal University Shijiazhuang 050024 China

We theoretically study tile optimum design of anisotropic acousto-optic modulator （AOM） based on lithium niobate crystal. Four different kinds of operating modes in the XOZ and YOZ acousto-optic （AO） planes arc systematically analyzed by the tangent condition theory and the optimized operating mode is deternfined. Purthermore, the dependence of the AO merit on the operating frequency and the off-axis angle of the AOM are also obtained by numerical simulations.

关键词： 160.1190 Anisotropic optical materials 170.1065 acousto-optics 230.1040 acousto-optical devices 230.4110 Modulators

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Hybrid laser-EMAT system for non-destructive testing continuous casting billet

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Chinese optics Letters 2013年第14期11卷 56-58页

作者：赵扬刘帅郭锐马健宋江峰孙继华贾中青 Laser Research Institute of Shandong Academy of Sciences Jinan 250014 China

A novel laser-electro magnetic acoustic transducer （EMAT） system for nondestructive testing NDT surface crack of continuous casting billet （CCB） is provided. Rayleigh wave generated by line laser source is used to detect the surface crack of CCB. According to the principle of mode conversion from Rayleigh wave to shear wave, the defect signal is received using the shear wave EMAT sensor in a non-contact way. Experiments are carried out on the steel sample with size 30 × 0.2 ×0.2 （mm） of crack. Further, the influences of life off value and distance between EMAT sensor and laser beam on the testing sensitivity are discussed, respectively. It is found that the life off value is the main factor that effects sensitivity of the proposed method. There is a clear prospect of the method applied to test continuously cast bloom at high temperature.

关键词： 110.5125 Photoacoustics 170.1065 acousto-optics 220.4840 Testing 070.1060 acousto-optical signal processing

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Hybrid laser ultrasonic inspection based on optical fiber technique

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Chinese optics Letters 2014年第A1期12卷 69-70页

作者：赵扬崔雷孙继华马健贾中青 Laser Institute of Shandong Academy of Sciences Jinan 250014 China Shandong Academy of Sciences Jinan 250014 China

Laser generation and electromagnetic acoustic transducer （EMAT） detection techniques are combined as a hybrid ultrasonic technique for the inspection of the defects in the steel. Laser transmits through the optical fiber and irradiates on the steel surface. In case of inspection, Rayleigh wave is generated to test the surface defects based on the principle of mode conversion. In order to improve the testing accuracy and signal-to- noise ratio, wavelet soft-threshold method is introduced in the present work. Experimental results show that errors of testing surface defect are less than 10%, which proves laser-EMAT technique to be suitable for non- destructive assessment of metallic materials.

关键词： 110.5125 Photoacoustics 170.1065 acousto-optics 220.4840 Testing 070.1060 acousto-optical signal processing

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Studies on the wideband design of acousto-optic deflector using lithium niobate crystal

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Chinese optics Letters 2014年第A2期12卷 100-103页

作者：杨婧高艳磊李洁杨振军庞兆广 College of Physics Science and Information Engineering Hebei Normal University Shijiazhuang 050024 China

We present theoretical studies on the wideband design of bulk lithium niobate （LN） acousto-optic deflector （AOD） through the walk-off design of the ultrasonic vector, which satisfies the momentum match condition. The ultrasonic properties of LN crystal are studied by solving the Christopher equation and the reciprocal velocity curves in the operating planes XOZ and YOZ are systematically obtained. The calculation results show that the bandwidth of the AOD is highly dependent on the incident angle of light beam and the velocity of the ultrasonic waves, which show strict linear properties in the operating bandwidth. Furthermore, the dependence of the central frequency of the AOD on the angle of incident light and the ultrasonic velocity are also analyzed.

关键词： 160.1050 acousto-optical materials 170.1065 acousto-optics 160.1190 Anisotropic optical materials

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State space formalism of Feynman diagram theory for acousto-optic interactions:Ⅱ. multifrequency case

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Chinese Journal of Acoustics 1993年第3期12卷 349-367页

作者： William T.Rhodes Georgia Institute of Technology Center for Optical Science and Technology Atlanta

A Feynman diagram theory for acousto-optic (AO) interactions is established, which provides a general method to calculate the scattering amplitudes and intensities for both single-frequency and multifrequency AO interactions. The method is based on counting the number of allowable Feynman diagrams. The following important assertion has been proved rigorously in this paper. The ratios of the numbers of Feynman diagrams allowable in various Bragg diffractions (isotropic, nondegenerate birefringent, and degenerate birefringent) to that in Raman-Nath diffraction are independent of the number of different acoustic frequencies, being a function only of the order of the Feynman diagram and the diffraction order of the final state. General expressions for these ratios are obtained. Based on this, complete perturbation solutions for the scattering amplitudes and intensities are obtained for any kind of AO interactions, any number of acoustic frequencies, and any final state. This theory gives all results obtained previously by the theory of coupled-wave equation. The theory is also verified by comparing with experiments.

关键词： acousto-optics Multifrcqucncy acousto-optic diffraction Feynman diagram theory.

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漫话起重机

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发明与创新(大科技) 1999年第1期 3-5页

中国远在春秋时期就发明了起重机—辘轳，即今天的绞车。这是一种将旋转运动转变为直线运动的机械，用来吊起重物。应用辘轳原理制成的机械有悬门沈机、巢车、铁索吊桥和连弩之车等。悬门沈机，远在公元前６４６年就已发明。据《左传庄... 详细信息

中国远在春秋时期就发明了起重机—辘轳，即今天的绞车。这是一种将旋转运动转变为直线运动的机械，用来吊起重物。应用辘轳原理制成的机械有悬门沈机、巢车、铁索吊桥和连弩之车等。悬门沈机，远在公元前６４６年就已发明。据《左传庄公２８年》“悬门不发”。庄公２８年...

关键词： acousto-optics heterodyne spectrum analysis sensitivity

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