为实现对大尺寸光学材料及系统元件的高精度对准测试, 设计了一种新型Φ200 mm口径长焦距准直干涉测试装置。该装置以球面标准镜作为参考镜, 结合斐索型透射式干涉机制和长焦距准直测试原理对凹球面大曲率半径光学元件进行面形精度检测, 最大测试口径为Φ226.67 mm, 且球面标准镜和球面标准反射镜同轴共球心, 大幅度减小了测试空腔距离。结果表明, 该系统空腔测试精度PV值为0097λ@6328 nm, RMS值为0013λ@6328 nm, 系统重复稳定性优于λ/500@6328 nm, 可实现曲率半径为7 500~8 500 mm测试, 且大曲率半径测试误差小于1/1 000。

采用635 nm波长半导体可见光激光和10.5 μm波长半导体红外激光作为干涉光源, 设计了635 nm和10.5 μm 双波段共光路透射式红外干涉仪, 实现了可见光波段干涉测试与红外光波段干涉测试共光路, 且双光路共用可见光对准。双波段共用机械式相移系统, 并采用635 nm测试光分段驻点标定10.5 μm测试时相移器的长行程误差。研制的双波长红外干涉仪系统的红外测试精度达到PV优于0.05λ, RMS优于0.02λ, 系统重复性RMS优于0.001λ。采用该干涉仪测试口径为400 mm×400 mm, 离轴量为800 mm的离轴非球面, 得到边缘最大偏差值为21.9 μm, 能够实现大口径离轴非球面从粗磨到精磨高精度加工面形的全过程干涉测试。

分析了相移干涉测量过程中相移误差产生的原因, 研究了基于迭代最小二乘算法的相移误差修正法, 实现了任意两幅干涉图间相对移相量的计算和自适应校正。基于光、机、电、算四系统, 实现任意步长的3幅以上干涉图像的采集, 用迭代最小二乘法计算任意两幅干涉图间的相对移相量, 然后将其闭环反馈至硬件相移系统, 自动修正相移步长为给定量的特征相移值, 从而完成干涉仪相移误差的自修正。 构建了相移误差自校正系统, 通过实际干涉测量验证了算法的正确性和相移误差自修正系统的可行性。结果表明, 自适应修正后相移量相对误差<5％, 面形RMS测量重复性<λ/1 000, 实现了高精度、高效率的相移误差自适应修正。

A stable and efficient all solid-state green laser with average power over 30 W is studied. The phase mismatching and thermal lens effect induced by local temperature rise of doubling frequency crystal are the major reasons affecting frequency doubling efficiency and laser output power stability. The method of grads-compensating temperature controll is used to adjust the operating temperature of frequency doubling crystal with large size. This temperature control system debases the inside and outside temperature grads of crystal to compensate the phase mismatching and thermal lens effect of frequency doubling crystal. This laser that is side-pumped by three bars laser diode array of 60 W and adopts the high efficiency flat-concave cavity, intracavity frequency doubling resonance structure, and acoust-optic Q-switching generates a maximum green average power of 31.6 W with 110 ns pulse width and 10 kHz repetition rate when pumped current of laser diode was 25 A and pumped power was 174.6 W. The optic-optic transition efficiency is up to 18.1%, and power stability is up to ±0.66% with beam quality factor of green laser M2=4.3.

This paper introduces a self-tuning fuzzy temperature control system for the diode-pumped solid-state (DPSS) blue laser at 473 nm. This temperature control system includes circuit of temperature sampling, power circuit of temperature adjusting, and fuzzy proportional-integral derivative (PID) controller. Circuit of temperature sampling adopts the precision temperature sensor for exact temperature sampling. The input signal of fuzzy PID controlling is digital signal from A/D transform chip, then the input analog signal of A/D transform chip is the differential signal of temperature sampling signal and setting temperature signal. The traditional PID control method cannot self-tune parameters of Kp, Ki, Kd in operating, this paper applies the method of combining fuzzy illation with traditional PID controlling to realize self-tuning parameter of PID. This system designs the power circuit to respond to control signal of fuzzy PID controller, that power circuit is made up of high power metal-oxide-semiconductor (MOS) field effect transistors semiconductor and Peter component. This self-tuning fuzzy temperature control system has good dynamic characteristic and static characteristic, and the system has lower over-adjusting and shorter response time. The temperature control precision of system is up to +-0.05 deg., the change range of the pump laser diode wavelength is below 0.02 nm, and the power stability of the laser at 473 nm is below +-1%.

研究了平均功率超过30 W的稳定高效全固态绿光激光器,分析得出影响全固态腔内倍频激光器倍频效率和输出稳定性的主要因素是倍频晶体局部温升造成的相位失配和热透镜效应,采用温度梯度补偿控温法对大尺寸倍频晶体进行温度控制,降低激光器工作中倍频晶体内外温度梯度从而有效地克服因晶体局部温升造成的倍频相位匹配角失配和热透镜效应。采用三条60 W的半导体激光二极管阵列板条侧面抽运Nd:YAG激光增益介质棒,采用声光调Q,平凹直腔和腔内倍频结构配合温度梯度补偿控温法对大尺寸倍频晶体进行温度控制,得到了稳定高效的532 nm绿光输出。在抽运电流25 A,抽运功率174.6 W时,得到了脉冲宽度110 ns,重复频率10 kHz,输出平均功率31.6 W稳定高效的绿光输出,光-光转换效率为18.1%,功率稳定性为±0.66%,绿光输出光束质量因子M2=4.3。

从理论上分析了强激光能源系统新型放电回路能量传输效率和氙灯能量分配均匀性问题,给出了预电离回路的实验研究结果,此外还介绍了新型大尺寸氙灯爆炸能量的测试情况.

高功率固体激光驱动器能源系统主要为闪光灯提供脉冲能量。在对能源系统的研究中,通过采用具有预电离技术的电容器一端接地的电路结构,选用新品低损耗电缆及其它措施,有效地抑制了电磁干扰和地电位抬高,提高了电路的能量转换效率,从而满足了惯性约束聚变驱动器对能源系统的要求。尤其加预电离后,闪光灯放电电流波形发生变形有利于提高放大器效率的变化。