A distributed feedback (DFB) fiber laser with a ratio of the backward to forward output power of 1:100 was composed by a 45-mm-length asymmetrical phase-shifted fiber grating fabricated on the 50-mm erbium-doped photosensitive fiber. Forward output laser was amplified using a certain length of Nufern EDFL-980-Hp erbium-doped fiber to absorb the surplus pump power after the active phase-shifted fiber grating and get population inversion. By using OptiSystem software, the best fiber length of the EDFL to get the highest gain was simulated. In order to keep the amplified laser with the narrow line-width and low noise, a narrow-band light filter consisting of a fiber Bragg grating (FBG) with the same Bragg wavelength as the laser and an optical circulator was used to filter the amplified spontaneous emission (ASE) noise of the out-cavity erbium-doped fiber. The designed laser structure sufficiently utilized the pump power, and a DFB fiber laser with the 32.5-mW output power, 11.5-kHz line width, and -87-dB/Hz relative intensity noise (RIN) at 300 mW of 980 nm pump power was brought out.

采用“一体化自放大”技术，从实验上研究了XeCl激光器振荡-放大一体化的特性，获得了自放大输出的明显结果，并分析了自放大的内在要求。结果及理论分析表明，这种系统可适用于高增益激光系统的光束质量的改善，并用于准分子激光器件的窄带高功率输出的获得。

本文阐述了使连续、单模、稳频、环形染料激光通过CuBr放电管,在578.2nm跃迁线上进行放大和吸收的方法。得到了2P1/2和2D3/2能级的粒子数分布情况。用黄光自放大方法测出了随输入功率变化的578.2nm跃迁线上下两能级的反转粒子数。