Passively Q-switched laser with single longitudinal mode based on the frequency selection of grating and F-P etalon in twisted-mode folded cavity  

作　　者：宋宝安 赵卫疆 任德明 曲彦臣 张合勇 钱黎明 胡孝勇 

机构地区：[1]National Key Laboratory of Tunable Laser Technology,Harbin Institute of Technology

出　　处：《Chinese Optics Letters》2009年第9期805-808,共4页中国光学快报（英文版）

摘　　要：A passively Q-switched side-pumped laser with folded resonator is specially constructed for single- longitudinal-mode smooth pulse output. Nd：YAG is chosen as the laser active medium and Cr^4＋：YAG as the saturable absorber medium. Additionally, the method of frequency selection by grating with 1200 line/mm and Fabry-Perot （F-P） etalon is used in the twisted-mode cavity. The single-frequency smooth pulses are produced with 10-Hz repetition rate, 20-ns pulse width, and 1.064-μm wavelength. The proba- bility of single-frequency laser output measured is over 99% by using the methods of Fourier analysis and F-P etalon multiple-beam interferometry at the threshold voltage. The measured near-field and far-field angles of divergence are 1.442 and 1.315 mrad, respectively. The values of M^2 are 1.32 and 1.31 separately with the knife-edge method. Single pulse at 1.064 tim with the energy of 8.8 mJ is achieved in TEM00 mode.A passively Q-switched side-pumped laser with folded resonator is specially constructed for single- longitudinal-mode smooth pulse output. Nd：YAG is chosen as the laser active medium and Cr^4＋：YAG as the saturable absorber medium. Additionally, the method of frequency selection by grating with 1200 line/mm and Fabry-Perot （F-P） etalon is used in the twisted-mode cavity. The single-frequency smooth pulses are produced with 10-Hz repetition rate, 20-ns pulse width, and 1.064-μm wavelength. The proba- bility of single-frequency laser output measured is over 99% by using the methods of Fourier analysis and F-P etalon multiple-beam interferometry at the threshold voltage. The measured near-field and far-field angles of divergence are 1.442 and 1.315 mrad, respectively. The values of M^2 are 1.32 and 1.31 separately with the knife-edge method. Single pulse at 1.064 tim with the energy of 8.8 mJ is achieved in TEM00 mode.

关 键 词：CHROMIUM Etalons Fourier analysis Pulsed laser applications Pumping (laser) Q switching 

分 类 号：TN248[电子电信—物理电子学]