文档介绍：华中科技大学
硕士学位论文
低噪声LD泵浦固体激光器及其控制电路设计
姓名:黄马波
申请学位级别:硕士
专业:光学工程
指导教师:胡必春
20060419
摘要
随着高效率、高功率的 LD 及其阵列的突破性发展,LD 泵浦的固体激光器的研究
也不断取得进展并达到实用化水平。LD 泵浦的固体激光器具有高效率、高稳定性、窄
线宽、较长的使用寿命及小型化等优点,已经在激光医学、光存储、激光测距、光谱
分析等很多领域取得了广泛的应用。
本文对 LD 泵浦的固体激光器系统进行了深入研究,指出了影响激光器输出光功
率噪声的“绿光问题”,分析了解决的方法。实验中采用 Nd:YVO4 作为激光晶体,KTP
晶体作为倍频晶体,通过双折射滤波的方式,使激光器运行在单纵模下,在 500mW 的
泵浦功率下获得 21mW 的低噪声 532nm 绿光输出,其功率稳定度优于 %。通过实
验测试表明双折射滤波激光器系统的噪声水平严重依赖于温度控制的精度。
此外本文还对温度控制的 PID 方法进行了介绍,比较了各种温度传感器的优缺点,
根据实验中激光器系统的特殊需求设计了两套电流驱动和温度控制电路。它们均能提
供 LD 的稳流驱动、过流保护、高速调制等功能,能通过 NTC 热敏电阻和半导体制冷
器来实现对系统温度的精密控制。用分立元件构成的电路具有成本低、功能组合更灵
活的优点,并实现温控精度 ℃,用进口模块构成的电路具有电路板尺寸小、可靠
性高的优点,并实现温控精度 ℃,对于系统运转在低噪声输出功率下起到了重要
作用。

关键词:低噪声固体激光器 DPSL 电流驱动温度控制
Abstract
The research of LD pumped solid laser is making great progress as LD with high
efficiency and high power progresses. Because the LD pumped solid laser has so many
virtues, for example high efficiency, high stability, narrow line width, long life time and
small outline and so on, it has been utility instrument in many field such as laser medical,
optical storage, laser rangefinder, optical spectrum analysis etc..
LD pumped solid laser system is researched in this paper. The factors which influence
the noise of optical output power is pointed out. And the resolvent of “green problem” is
analysised. We used Nd:YVO4 as laser crystal and KTP as double frequency cystal in the
experiment. By the way of double refraction effect we get an optical filter to make the laser
system operate with single longitudinal mode. When the power of pumped light is 500mW,
we gain the freen light which’s power is 21mW. The noise of optical power is less than %.
We can draw a conclusion that the noise of the double refraction mode laser system depends
on the exact temperature control in the experiment.
The PID method which is applied to temperature control is introduced. And the
performance of several typ