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High-resolution (Doppler-limited) spectroscopy using quantum-cascade distributed-feedback lasers

机译:使用量子级联分布反馈激光器的高分辨率(多普勒限制)光谱仪

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Lasing characteristics were evaluated for distributed-feedback quantum-cascade (QC) lasers operating in a continuous mode at cryogenic temperatures. These tests were performed to determine the QC lasers' suitability for use in high-resolution spectroscopic applications, including Doppler-limited molecular absorption and pressure-limited lidar applications. By use of a rapid-scan technique, direct absorbance measurements of nitric oxide (NO) and ammonia (NH3) were performed with several QC lasers, operating at either 5.2 or 8.5 mu m. Results include time-averaged linewidths of better than 40 MHz and long-term laser frequency reproducibility, even after numerous temperature cycles, of 80 MHz or better. Tuning rates of 2.5 cm(-1) in 0.6 ms can be easily achieved. Noise-equivalent absorbance of 3 x 10(-6) was also obtained without optimizing the optical arrangement. (C) 1998 Optical Society of America. [References: 12]
机译:对在低温下以连续模式工作的分布式反馈量子级联(QC)激光器的激光特性进行了评估。进行这些测试是为了确定QC激光器是否适用于高分辨率光谱应用,包括多普勒限制分子吸收和压力限制激光雷达应用。通过使用快速扫描技术,使用数个在5.2或8.5微米下工作的QC激光器对一氧化氮(NO)和氨(NH3)进行了直接吸光度测量。结果包括超过40 MHz的时间平均线宽和即使在多个温度循环后仍具有80 MHz或更高的长期激光频率再现性。可以很容易地在0.6毫秒内达到2.5 cm(-1)的调谐速度。在不优化光学结构的情况下,也获得了3 x 10(-6)的等效噪声吸收率。 (C)1998年美国眼镜学会。 [参考:12]

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