High-speed vertical-cavity surface-emitting laser (VCSEL) absorption spectroscopy of ammonia (NH3) near 1.54 μm

G. Totschnig, M. Lackner, R. Shau, M. Ortsiefer, J. Rosskopf, M. C. Amann, F. Winter

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

48 Zitate (Scopus)

Abstract

A single-frequency VCSEL has been used for the first time for high-resolution spectroscopy near 1.5 μm. The incorporated buried-tunnel-junction technology enabled the realization of a long-wavelength InGaAlAs/InP VCSEL with low threshold current (0.925 mA), high output powers (0.576 mW) and low series resistance (60 Ω). The high-speed tuning capability of the long-wavelength VCSEL was investigated and used to conduct high-speed absorption spectroscopy. The peak tuning speed was measured to be 3.4 cm-1/μs and a 4.5-cm-1-wide NH3 spectrum was recorded in 2 μs. The VCSEL was used to measure highly resolved low-pressure spectra for pressures ranging from 9.6 mbar to 1 bar. The measured Doppler-broadened linewidth of 0.02 cm-1 agrees within 3% with the theoretical calculations. The availability and various advantages of 1.3-2-μm single-frequency VCSELs as compared to edge-emitting diode lasers, such as a large current tuning range even at very high tuning frequencies, and low production costs, should significantly expand the application fields for near-infrared laser gas sensors.

OriginalspracheEnglisch
Seiten (von - bis)603-608
Seitenumfang6
FachzeitschriftApplied Physics B: Lasers and Optics
Jahrgang76
Ausgabenummer5
DOIs
PublikationsstatusVeröffentlicht - Mai 2003

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