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首页> 外文会议>Conference on Laser Applications to Chemical and Environmental Analysis, Feb 11-13, 2000, Santa Fe, New Mexico >A widely tunable cw Raman laser in H_2 pumped by an external cavity diode laser
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A widely tunable cw Raman laser in H_2 pumped by an external cavity diode laser

机译：外腔二极管激光器泵浦的H_2中可广泛调谐的Cw拉曼激光器

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Stimulated Raman scattering is conventionally studied in high-power and pulsed laser regimes. Continuous-wave (cw) Raman lasers have been realized but they have to operate near a molecular/atomic resonance utilizing the high Raman gain. The first non-resonant cw Raman laser was demonstrated by Brasseur, et al. in 1998. In this system, a frequency doubled cw Nd:YAG laser at 532nm was used as the pump source. The extremely low Raman gain far off resonance was compensated by placing the Raman gas between the mirrors of a high-finesse cavity (HFC). By high-reflective (HR) coating the HFC mirrors for both the pump and Stokes wavelengths, a threshold on the order of~lmW was achieved. This indicated the possibility of pumping the cw Raman laser with conventional diode lasers. Roos et al. then demonstrated the first diode-pumped cw Raman laser. A free-running laser diode was optically locked to an HFC and a threshold of 240μW was achieved. Both of these cw Raman laser systems exhibited difficulty in wavelength tuning and the tuning ranges were limited. In this paper we choose an external-cavity diode laser (ECDL) as the Raman pump. Owing to the wide tuning range and wavelength selectivity of the ECDL, we obtain tunable cw Raman-shifted output in the NIR spectral region from 1174 to 1214nm. A 1.5GHz mode-hop-free continuous tuning is currently observed. Combined with its high spectral purity, this ECDL-pumped cw Raman laser becomes an attractive new laser source for high-resolution spectroscopy in the NIR spectral region.
机译：传统上在高功率和脉冲激光条件下研究受激拉曼散射。已经实现了连续波（cw）拉曼激光器，但是它们必须利用高拉曼增益在分子/原子共振附近工作。 Brasseur等人证明了第一个非共振连续拉曼激光器。 1998年。在该系统中，使用了倍频的532nm连续Nd：YAG激光作为泵浦光源。通过将拉曼气体放置在高精细腔体（HFC）的反射镜之间，可以补偿极低的拉曼增益，从而使其远离共振。通过针对泵浦波长和斯托克斯波长对HFC镜进行高反射（HR）涂层，可以达到约lmW的阈值。这表明用常规二极管激光器泵浦连续拉曼激光器的可能性。 Roos等。然后展示了第一台二极管泵浦的连续拉曼激光器。将自由运行的激光二极管光学锁定到HFC，并达到240μW的阈值。这两个连续拉曼激光系统都在波长调谐方面表现出困难，并且调谐范围受到限制。在本文中，我们选择外腔二极管激光器（ECDL）作为拉曼泵。由于ECDL的宽调谐范围和波长选择性，我们在1174至1214nm的NIR光谱区域中获得了可调谐的cw拉曼位移输出。当前观察到1.5GHz无跳频连续调谐。结合其高光谱纯度，这种ECDL泵浦的连续拉曼激光器成为近红外光谱区域中高分辨率光谱学的一种有吸引力的新型激光源。

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