1 中国科学院 国家空间科学中心, 北京 100190
2 中国科学院大学, 北京 100190
3 Synopsys(北京)有限公司, 北京 100086
针对国内星载数传发射机无法实现载波频率灵活可变的问题, 提出了一种可配置输出频率的载波源方案。采用现场可编程门阵列(FPGA)和数模转换器(DAC)相结合, 实现参考频率高精度可变且灵活配置锁相环(PLL)中鉴相器的鉴相频率, 使载波源输出频率可程控配置。实测结果表明, 载波源可实现任意配置X波段8.025～8.4 GHz的输出中心频点, 相位噪声优于-66 dBc/Hz@100 Hz、-75 dBc/Hz@1 kHz 、-80 dBc/Hz@10 kHz、-95 dBc/Hz@100 kHz、-120 dBc/Hz@1 MHz, 杂散抑制度优于-74 dBc, 频率分辨率小于10 Hz。相关电路替代专用直接数字频率合成(DDS)芯片的功能, 能适应空间应用环境。
星载数传发射机 载波源 锁相环(PLL) X波段 直接数字频率合成(DDS) 空间应用环境 space-borne data transmitter carrier source phase-locked loop(PLL) X-band direct digital frequency synthesis(DDS) space application environment
Author Affiliations
Abstract
1 Key Lab of Functional Crystal and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
2 School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China
3 Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China
A high efficiency, high power diode-side-pumped quasi continuous wave (QCW) Nd:YAG ceramic rod laser at 1064 nm based on the domestic transparent ceramic is reported. The average output power of 961 W is achieved with double ceramic rods by means of a symmetrical convex-convex cavity. The optical-to-optical conversion efficiency is 38.3% and the slope efficiency is 45.3%. To the best of our knowledge, this is the highest level of efficiency achieved for the domestic Nd:YAG ceramic rod laser.
Nd:YAG陶瓷激光器 二极管侧面泵浦激光器 准连续波 140.3460 Lasers 140.3480 Lasers, diode-pumped 140.3580 Lasers, solid-state Chinese Optics Letters
2010, 8(12): 1144
