A frequency-stabilized difference frequency generation laser spectrometer for precise line profile studies in the midinfrared

作者：Deng Wen Ping^*; Gao Bo; Cheng Cun Feng; Cheng Guo Sheng; Hu Shui Ming; Zhu Qing Shi

来源：Review of Scientific Instruments, 2008, 79(12): 123101.

DOI：10.1063/1.3033164

• infrared spectra
• infrared spectrometers
• laser frequency stability
• laser tuning
• lithium compounds
• neodymium
• optical frequency conversion
• sapphire
• solid lasers
• titanium

A midinfrared laser spectrometer is built up based on the difference frequency generation (DFG) of a Nd:YAG (yttrium aluminum garnet) laser and a tunable Ti:sapphire (Ti:Sa) laser. Tuning the Ti:Sa laser and operating properly with the periodically poled lithium niobate crystal, the DFG emission is tunable in the spectral range of 2.3-5.0 mu m. The 1064 nm Nd:YAG laser frequency is stabilized to the 10(-6) cm(-1) level on a Doppler-broadened I(2) absorption line at 532 nm. As a result, the DFG emission frequency is stabilized within 1x10(-4) cm(-1). The measurement of an absorption line of CH(4) near 3 mu m demonstrates that the DFG spectrometer is very suitable for the molecular absorption line profile studies in the midinfrared region.

• 出版日期2008-12
• 单位中国科学技术大学