Intracavity absorption spectroscopy with thulium-doped fibre laser
Intracavity absorption spectroscopy with thulium-doped fibre laser
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DOI：
10.1016/s0030-4018(02)02188-0
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发表时间：
2003
影响因子：
2.4
通讯作者：
A. Stark;L. Correia;M. Teichmann;S. Salewski;C. Larsen;V. Baev;P. Toschek
中科院分区：
文献类型：
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作者：
A. Stark;L. Correia;M. Teichmann;S. Salewski;C. Larsen;V. Baev;P. Toschek
为了将其应用于腔内激光吸收光谱，我们研究了由二极管激光器泵浦的多模掺Tm3+二氧化硅光纤激光器的光谱特性。在连续波工作中，光纤激光器的发射光谱通常为4 nm宽，可以在1.70 ~ 1.98 μm范围内调谐。由于空腔中存在大气，它显示出许多H2O和co2的吸收谱线。谱线的强度对应于7公里的有效吸收路径长度。通过光纤激光器的重复脉冲操作，利用专门设计的快速扫描傅立叶光谱仪进行光谱动力学测量。利用光声探测与波长调制相结合的方法，将激光调至1.9 μm附近的最强吸收，实现了对激光腔内水蒸气的高灵敏度探测。
For applications to intracavity laser absorption spectroscopy, we study the spectral properties of a multimode Tm3+-doped silica fibre laser pumped by a diode laser. In cw operation, the emission spectrum of the fibre laser is typically 4 nm wide and can be tuned from 1.70 to 1.98 μm. It shows many absorption lines of H2O and CO2due to the presence of the atmosphere in the cavity. The strength of the lines corresponds to a 7 km effective absorption path length. With repetitively pulsed operation of the fibre laser, measurements of the spectral dynamics are carried out by a specially designed rapid-scan Fourier spectrometer. Highly sensitive detection of water vapour in the laser cavity is possible when tuning the laser to the strongest absorption near 1.9 μm, and by using photoacoustic detection combined with wavelength modulation.