Development and transmission measurement of an ultra-narrow optical band pass filter for sodium lidar daytime observations

用于钠激光雷达日间观测的超窄光学带通滤波器的开发和传输测量

基本信息

批准号：
17340144
负责人：
KAWAHARA Takuya
金额：
$ 3.48万
依托单位：
Shinshu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

Summary of this research based on the fund is as followed.Developing a new sodium cell for a Faraday filter with the stable material against high temperature sodium vapor:A commercial type Pyrex-glass sodium cell does not work well when the cell is heated and sodium vapor is activated. We developed a Sapphire sodium cell using the special technique, optical contact method Sapphire is extremely stable against strong acid or base as well as sodium vaporEstablishing the procedure to measure transmissions of ultra-narrow optical band-pass filter with ring dye laser:The transmission width of a Faraday filter is about 10 pico meter that an ordinary spectrometer cannot resolve. The transmission measurement was done with a ring dye laser as an ultra-narrow light source at Tokyo Metropolitan University to precisely scan the transmission profile. The measured profile was reasonable but the results suggest the effective temperature is 10 degree lower than the monitored value.Doppler free spectrum measurements for absolute frequency measurements:Doppler free technique is the absolute frequency monitoring system around sodium D2 line using a sodium cell. By warming the laser with a special optical configuration, the spectrum was measured and the absolute frequencies were determined. This is necessary to determine the absolute frequency when the Faraday filter transmission is measured.Lidar receiving system with optical fibers:Optical fiber system is designed for the Mar receiving system bemuse strong magnetic field of Faraday filter affects the photoelectric detection using a photomultiplier tube. Designing an optical alignment with lenses was done and the efficiency was measured without Faraday filter The efficiency is 1/3 of the common system. Faraday filter may decrease the signal to 1/4. The results show the signal intensity decreases to roughly 1/10 in daytime.

基于该基金的这项研究的摘要如下。开发一个新的钠电池，用于使用高温钠蒸气的稳定材料的Faraday滤清器：商业型Pyrex-Glass钠细胞在加热和钠时无法正常工作。蒸气被激活。我们使用特殊技术开发了一个蓝宝石钠电池，光接触方法蓝宝石对强酸或碱以及蒸气钠非常稳定，以测量用环染料激光器测量超鼻涕光带滤波器的传输的程序：法拉第滤波器的滤波器约为10 pico仪表，普通光谱仪无法解决。通过环染料激光作为东京大都会大学的超纳罗光源进行传输测量，以精确扫描传输概况。测得的曲线是合理的，但结果表明，有效温度比监视值低10度。多珀勒的自由频谱测量值的绝对频率测量值：多普勒自由技术是使用钠电池围绕钠D2线周围的绝对频率监测系统。通过使用特殊的光学构型加热激光，测量了光谱并确定绝对频率。这是确定在测量法拉第滤波器传输时确定绝对频率的必要条件。带有光纤的lidar接收系统：光纤系统设计用于MAR接收系统的bemuse tobuse tobuse tobuse faraday滤波器的强磁场会影响光电量化管的光电检测。设计了与透镜的光学对齐，并在没有法拉第过滤的情况下测量了效率，效率为公共系统的1/3。法拉第过滤器可能会将信号降低到1/4。结果表明，信号强度在白天降至大约1/10。