Artigo Revisado por pares

Intracavity absorption spectroscopy with thulium-doped fibre laser

2002; Elsevier BV; Volume: 215; Issue: 1-3 Linguagem: Inglês

10.1016/s0030-4018(02)02188-0

ISSN

1873-0310

Autores

Arnold Stark, Lucas Ian Veloso Correia, Martin Teichmann, Stefan Salewski, Camilla Marie Larsen, V. M. Baev, P. E. Toschek,

Tópico(s)

Laser Design and Applications

Resumo

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 CO2 due 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.

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