傅里叶望远镜发射系统的性能直接影响图像的分辨率和质量。分析了激光器的参数和性能要求，提出了光纤激光器的设计要点,并指出激光相干长度应至少为光程残差的1.6倍；对激光器的功率和频率稳定性进行了仿真，从设计、算法和使用角度给出了保证激光器稳定性的一些方法；而且结合仿真和实验结果，从发射孔径布局、孔径数量、位置精度和光束瞄准误差等方面，分析了发射器性能对成像质量的影响。指出了基线冗余度、图像分辨率、目标频谱分布和图像质量等因素在布设发射阵列应综合考虑。基于二维抽样定理和统计分析结果，得出计算发射孔径数量的公式，计算了傅里叶望远镜对1000 km 低轨道目标达到5 cm 分辨率时所需的发射孔径数目。此外，还得出发射孔径位置误差应小于最小孔径间距的5%的结论。

We report a nanosecond-pulse amplification system based on an Yb-doped, 100-\mu m core, rod-type photonic crystal fiber. Up to 10W of average power with pulse energy of 1 mJ and peak power of 450 kWis obtained at the repetition rate of 10 kHz. The high-power nanosecond pulse has a good pulse shape and spectral characteristics. The usage of rod-type fibers provides a novel structure for nanosecond pulse amplification.

This study presents an eye-safe, single-mode, nanosecond-pulsed, and all-fiber laser source with master-oscillator-power-amplifier configuration at 1 550 nm that is suitable for high-resolution three-dimensional (3D) imaging light detection and ranging (LIDAR) system. The output peak power of 7.6 kW is obtained at the 1.2-ns pulse width and 50-kHz repetition rate. The single-mode pulse laser output ensures the range precision and imaging results of the LIDAR system. The laser is used as a transmitter for the 3D imaging LIDAR system. The detailed characteristics of the LIDAR system and the results of the 3D imaging are presented.

An all-digital design method consisting of a laser drive circuit for gradually modulating the frequency, pulse width, and amplitude of the output of semiconductor laser is demonstrated. Field programmable gate arrays (FPGAs) and accurate delaying chip are used to generate the pulse. The repetition rate and pulse width of the laser pulse gradually adjust from 1 to 10 kHz and 700 ps to 3 ns, respectively. Furthermore, the time of the rising and falling edges for the laser pulse is less than 800 ps.

报道了一台适用于分布式光纤传感的全光纤激光器。激光器基于主振荡功率放大(MOPA)技术，种子光源为半导体激光器，放大器为掺铒光纤放大器。实现了重复频率和脉冲宽度分别独立可调的激光输出，中心波长为1550 nm，光谱的3 dB带宽小于0.2 nm，获得的最高峰值功率为1.1 kW，输出的激光脉冲中放大自发辐射(ASE)功率分数的最大值低于10%。

We present a novel high-energy, single-mode, all-fiber-based master-oscillator-power-amplifier (MOPA) laser system operating in the C-band with 3.3-ns pulses and a very widely tunable repetition rate, ranging from 30 kHz to 50 MHz. The laser with a maximum pulse energy of 25 \muJ and a repetition rate of 30 kHz is obtained at a wavelength of 1548 nm by using a double-clad, single-mode, Er:Yb co-doped fiber power amplifier.

对脉冲抽运与增益预抽运的微腔Cr4+:YAG/Nd:YAG被动调Q激光器的稳定性进行了理论和实验研究。结果表明在抽运时抽运脉宽和重复率较大的情况下,输出激光脉冲相对于抽运脉冲抖动范围明显加大。针对此情况,采用压缩抽运脉宽和降低重复率的方法获得了波长为1.06 μm、脉宽为3.8 ns、单脉冲能量为65 μJ、相对抽运脉冲的抖动范围小于0.8 μs的激光输出。同时分析了增益预抽运的优势和缺点。

报道了用976 nm激光二极管(LD)抽运掺Yb3+增益光纤,用光纤耦合的声光调制器(AOM)实现全光纤环形腔主动调Q激光输出的实验研究。激光器的调制频率在200 Hz～60.9 kHz之间调节时获得稳定的调Q脉冲输出。当抽运光功率为183 mW,调制频率为500.2 Hz时,获得输出峰值功率为2.7 W,脉冲宽度为53.2 ns,单脉冲能量为145.5 nJ的激光脉冲,激光器的输出波长为1030 nm。当Q开关关闭时间较短时,从实验中观察到高低脉冲间隔输出的情况,利用调Q原理给出了相应解释。从实验和理论上分析了调制频率和抽运功率对激光器输出脉冲的影响,并进行了相应的计算,计算值和实验结果符合得较好。