题目

英语翻译
First there is an optical gain medium that amplifies the light via stimulated emission and second an optical feedback structure that repeatedly passes a resonant light field through the gain medium to establish a very intense,coherent optical field inside the laser.
A second simple configuration for an optical cavity is an optical ring resonator,in which the light circulates as a travelling wave around a closed path defined by three or more mirrors

提问时间：2020-11-30

答案

First there is an optical gain medium that amplifies the light via stimulated emission and second an optical feedback structure that repeatedly passes a resonant light field through the gain medium to...