A tunable diode-laser spectrometer for the MIR region near 7.2 μm applying difference-frequency generation in AgGaSe2 |
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Authors: | B Sumpf D Rehle T Kelz H-D Kronfeldt |
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Institution: | Optisches Institut der Technischen Universit?t Berlin, Sekr. PN 0-1, Hardenbergstr. 36, 10623 Berlin, Germany (Fax: +49-30/314-22742, E-mail: kf@mail.physik.tu-berlin.de), DE
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Abstract: | 2 and two diode lasers as pump sources are presented. A single-mode Fabry–Pérot-type tunable diode laser (TDL) and an external-cavity
diode laser (ECL) were combined to generate radiation in the mid-infrared region near 7.2 μm. With a TDL at a wavelength of
approximately 1290 nm and an ECL emitting between 1504 and 1589 nm it was possible to carry out spectroscopic experiments
concerning SO2 at five different phasematching points between 1350 and 1400 cm-1 by fixing the wavelength of one pump laser and tuning the wavelength of the other. With an input power of 8 mW for the single-mode
Fabry–Pérot-type diode laser and 6 mW for the external-cavity laser an output power of about 10 nW was generated. Using the
tuning capabilities of the external-cavity laser a spectral region up to 5 cm-1 could be covered within one scan. Measurements of SO2 absorption lines at low pressure demonstrate the high-resolution features of the spectrometer. Moreover, these data provide
new direct experimental phasematching data for the rarely investigated spectral region at 7.2 μm.
Received: 27 October 1997/Revised version: 8 May 1998 |
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Keywords: | PACS: 42 60 B 35 80 + |
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