摘要
针对当前可调谐半导体激光器吸收光谱(TDLAS)技术中调谐范围、调谐时间以及系统复杂性方面存在的不足,提出了利用激光器模块中的热电制冷器(TEC)和负温度系数(NTC)热敏电阻等元件对激光二极管(LD)进行温度宽谱调谐的方法,并在快速温度调谐过程中精确计算激光器的辐射波长。利用温度调谐二极管吸收光谱技术在3s的时间内测得了CO2气体在6320～6336cm-1波段的高分辨率吸收光谱。在此波段共测得8个较强吸收线。将得到的光谱参数与HITRAN 2008中的数据比较,吸收线位置、线强以及半峰全宽(FWHM)的偏差分别小于1%,3%以及6%。另外,测得的14条较弱的吸收谱线也与谱库中的谱线参数吻合。
There are some disadvantages in the current tunable diode laser absorption spectroscopy （TDLAS）, such as tuning range, tuning time and system complexity. A fast temperature tuning method of broad spectrum is developed and the dynamic wavelength of the laser is calculated precisely during the temperature tuning by means of thermo-electric cooler （TEC） and negative temperature coefficient （NTC） thermistor integrated in laser diode module. The spectral measurements of CO2 absorption lines from 6320 to 6336 cm-1 are performed at room temperature by using fiber-coupled distributed feedback （DFB） diode laser operating at 1.58 ~m with measurement time less than 3 s. Eight strong absorption lines are obtained and are compared with HITRAN 2008 database, which shows that the deviations of absorption line positions, line strength and full-width at half-maximum （FWHM） are less than 1%, 3 % and 6 %, respectively. Additionally, the corresponding spectral parameters of 14 weak absorption lines are very consistent with those in HITRAN 2008 database.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2012年第1期298-303,共6页
Acta Optica Sinica
基金
精密测试技术及仪器国家重点实验室探索课题(PILT1107)
天津市自然科学基金(10JCZDJC22700)资助课题
关键词
光谱学
可调谐半导体激光器吸收光谱
温度调谐
谱线参数
spectroscopy
tunable diode laser absorption spectroscopy
temperature tuning
spectral line parameter
