摘要
可调谐空间光学衰减器在各类光电系统中具有广泛的应用前景。基于法布里-珀罗多光束干涉原理,创新性地设计了一种适用于相干光束的可调谐空间光学衰减器,该衰减器选取在红外波段具有较高折射率的硒化锌晶体作为材料,结合温度控制系统,实现光功率的调谐。采用Nd:YAG激光器作为光源,对该衰减器的性能进行测量,其调谐范围可以达到3 d B。理论分析表明,相对于热膨胀系数,硒化锌材料的热光系数是决定衰减器性能的关键参量。此外,通过在硒化锌光学平板前后表面镀高反膜,可进一步提高调谐范围。
Continuously tunable space optical attenuator has a wide prospect in various optoelectronic equipments. Based on the principle of Fabry-Perot interferometer, a new space optical attenuator was presented, its key component is a Zn Se crystal sheet, combined with a high accurate temperature control system, the attenuation ratio of laser beam can be tuned. The attenuation performance was measured with a Nd：YAG laser as light source. The experimental results indicate that the tuning range of the attenuator can reach 3 d B. Theoretical analysis shows that compared with thermal expansion coefficient, thermo-optic coefficient of Zn Se material plays a key role in determining the attenuator performance. In addition, by coating highly reflective dielectric film on both sides of Zn Se sheet, the tuning range can be further increased.
出处
《红外与激光工程》
EI
CSCD
北大核心
2015年第2期673-676,共4页
Infrared and Laser Engineering
基金
国家863计划(2009AA7010402)
关键词
光学衰减
连续调谐
法布里-珀罗干涉
热光系数
optical attenuator
continuously tunable
Fabry-Perot interference
thermo-optic coefficient
