Abstract: A high resolution and high sensitivity spectroscopic technique is developed by utilizing a Bruker IFS 120HR Fourier-transform spectrometer to detect the absorption spectra of samples inside a Ti:Sapphire laser cavity. A trigger-sampling system makes it possible to investigate the evolution of intra-cavity laser absorption spectra with the generation time. Owing to the multiplex advantage of FTS, the quantum noise in ICLAS can be significantly reduced in FT-ICLAS. The absorption of atmospheric water vapor in the range of 12450 - 12700 cm$+$MIN@1$/ was recorded at a resolution of 0.05 cm$+$MIN@1$/ to examine the performance of our FT-ICLAS apparatus. With 200 scans on the FT-ICLAS within 2 hours, a sensitivity of 10$+$MIN@9$/ cm$+$MIN@1$/ was obtained. It is also demonstrated that the FT-ICLAS is able to record both positions and intensities in a wide spectral range. This technique was applied to measure the HOD v$-OD$/ $EQ 5 overtone in the range of 12550 - 12900 cm$+$MIN@1$/ with a resolution of 0.05 cm$+$MIN@1$/. The spectrum was analyzed with the ground states combination differences method and the spectroscopic parameters were obtained. For 81.1% rotational levels in this band, the difference between calculate and experimental energy was less than 0.01 cm$+$MIN@1$/ which indicated that both the recording and analyzing of this spectrum were successful.!4
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机译：摘要：利用布鲁克IFS 120HR傅里叶变换光谱仪开发了一种高分辨率，高灵敏度的光谱技术，用于检测Ti：Sapphire激光腔内样品的吸收光谱。触发采样系统使研究腔内激光吸收光谱随时间的演变成为可能。由于FTS的多重优势，可以显着降低FT-ICLAS中ICLAS中的量子噪声。以0.05 cm ++ MIN @ 1 $ /的分辨率记录了在12450-12700 cm ++ MIN @ 1 $ /范围内的大气水蒸气的吸收，以检查FT-ICLAS仪器的性能。在2小时内用FT-ICLAS进行了200次扫描，灵敏度为10 $ + MIN @ 9 $ / cm $ + MIN @ 1 $ /。还证明了FT-ICLAS能够在很宽的光谱范围内记录位置和强度。该技术用于测量HOD v $ -OD $ / $ EQ 5泛音，范围为12550-12900 cm $ + $ MIN @ 1 $ /，分辨率为0.05 cm $ + $ MIN @ 1 $ /。用基态组合差法分析光谱，得到光谱参数。对于该频带中81.1％的旋转水平，计算能量与实验能量之差小于0.01 cm $ + $ MIN @ 1 $ /，这表明该光谱的记录和分析均成功完成了！！ 4
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