Injection seeded single mode intra-cavity absorption spectroscopy
- 79 Downloads
We present a single mode intra-cavity spectroscopy system in which the test laser is locked to a narrow band external single mode laser. This technique solves many problems typically encountered in single mode intra-cavity spectroscopy: it results in good tuning properties, a stable single mode operation close to the lasing threshold, a high side-mode suppression and a reduction of spontaneous emission without the use of any frequency selective element. Measurements of broadband absorptions as well as measurements of a narrow band absorption line of the oxygen A-band are presented and compared with theoretical model predictions. The prototype described in this work provides an enhancement in sensitivity of approximately a factor of 12, and it demonstrates the influence of optical injection to single mode intra-cavity spectroscopy. As there is no need for any frequency selective element inside the cavity, the sensitivity can be massively enhanced by optimizing the laser cavity.
PACS42.62.Fi 42.55.Px 07.07.Df
Unable to display preview. Download preview PDF.
- 1.F.K. Tittel, G. Wysocki, A. Kosterev, Y. Bakhirin, Semiconductor Laser Based Trace Gas Sensor Technology: Recent Advances and Applications, Mid-Infrared Coherent Sources and Applications. NATO Science Series (Springer, New York, 2008), pp. 467–493 Google Scholar