Author Affiliations
Abstract
1 Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS), 46 Ulyanov Street, Nizhny Novgorod 603950, Russia
2 National University of Science and Technology “MISIS,” 4 Leninsky Prospekt, Moscow 119049, Russia
We report on the design and performance of a fiber laser system with adaptive acousto-optic macropulse control for a novel photocathode laser driver with 3D ellipsoidal pulse shaping. The laser system incorporates a three-stage fiber amplifier with an integrated acousto-optical modulator. A digital electronic control system with feedback combines the functions of the arbitrary micropulse selection and modulation resulting in macropulse envelope profiling. As a benefit, a narrow temporal transparency window of the modulator, comparable to a laser pulse repetition period, effectively improves temporal contrast. In experiments, we demonstrated rectangular laser pulse train profiling at the output of a three-cascade Yb-doped fiber amplifier.
Laser amplifiers Lasers, ytterbium Acousto-optical devices Modulators Photonics Research
2017, 5(4): 04000293
Author Affiliations
Abstract
School of Electrical and Computer Engineering, University of Seoul, 163 Seoulsiripdae-ro, Dongdaemun-gu, Seoul 02504, South Korea
An all-fiber acousto-optic modulator (AOM), which features a compact structure and a low-driving voltage, is experimentally demonstrated for the active mode-locking of a fiber laser. The proposed AOM is based on the short length of the cladding-etched fiber, the ends of which are fixed on a slide glass. On top of the cladding-etched fiber, a piezoelectric transducer was overlaid. A chemical wet-etching technique, which is based on a mixed solution of NH4F and (NH4)2SO4, is used to reduce the fiber diameter down to ～25 μm, and the length of the etched section is only 0.5 cm. The fabricated device exhibited a modulation depth of 73.10% at an acoustic frequency of 918.9 kHz and a peak-to-peak electrical voltage of 10 V, while a laser beam was coupled at 1560 nm. By using the prepared AOM within an erbium-doped-fiber ring cavity, the mode-locked pulses with a temporal width of 2.66 ps were readily obtained at a repetition rate of 1.838 MHz.
(060.2340) Fiber optics components (140.4050) Mode-locked lasers (230.1040) Acousto-optical devices. Photonics Research
2017, 5(5): 05000391
Author Affiliations
Abstract
College of Physics Science and Information Engineering, Hebei Normal University,
We theoretically study the 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 are systematically analyzed by the tangent condition theory and the optimized operating mode is determined. Furthermore, the dependence of the AO merit on the operating frequency and the off-axis angle of the AOM are also obtained by numerical simulations.
160.1190 Anisotropic optical materials 170.1065 Acousto-optics 230.1040 Acousto-optical devices 230.4110 Modulators Chinese Optics Letters
2015, 13(s1): S11601
Author Affiliations
Abstract
An alternative technique for infrasound detection based on the self-mixing (SM) interference of a laser diode is described. The principle involved is the dependence of the power emitted by the laser diode on infrasound-induced membrane vibration. The Fourier transform and fringe-counting methods are used to analyze the self-mixing signal. Infrasound signals are experimentally measured from 2 to 20 Hz with a resolution of 0.25, and the results well agree with the theoretical ones.
120.7280 Vibration analysis 230.1040 Acousto-optical devices 280.3420 Laser sensors Chinese Optics Letters
2013, 11(2): 021201
Author Affiliations
Abstract
Department of Optoelectronic Engineering, College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
A novel concept for an optical multilayer ultrasonic hydrophone with the sensing film deposited on a triangular pyramid glass substrate is proposed. Using the calculation model for the spectral coefficients’ derivatives of a dielectric multilayer optical coating, the acousto-optic sensitivity characteristic of the hydrophone is analyzed with different measurement laser polarizations and incident angles. We present a reasonable method and adjusting strategy for the optimum working point selection of the ultrasound measurement. Analytic results show that the novel hydrophone possesses all the other merits of a plate glass substrate optical multilayer hydrophone but with improved detection sensitivity. A longer measurement time without distortion decreases the difficulty of high frequency signal circuits. Spatial split of the ultrasound signal caused by the substrate’s triangular pyramid roof simplifies the spatial spot area correction, which contributes to the accurate calibration of the hydrophone’s wideband frequency response.
薄膜 光学薄膜水听器 膜系导数模型 声光灵敏度 基片结构 230.1040 Acousto-optical devices 280.4788 Optical sensing and sensors 310.6845 Thin film devices and applications 310.6870 Thin films, other properties Chinese Optics Letters
2011, 9(1): 013101
Author Affiliations
Abstract
1 Institute of Physics, Nankai University, Tianjin 300071, China
2 Institute of Modern Optics, Nankai University, Tianjin 300071, China
The interaction of multi-channel surface acoustic waves (SAWs) and a guided optical wave in fiber is studied, and the corresponding coupled wave equations are derived. A novel two-channel SAW all-fiber acousto-optic modulator is designed, fabricated, and tested. The theoretical analysis is supported by the experimental results.
声光元件 调制 调制器 230.1040 Acousto-optical devices 060.4080 Modulation 250.4110 Modulators Chinese Optics Letters
2010, 8(1): 107
