Frequency tuning of long-wavelength VCSELs

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
A LytkineJ Tulip

Abstract

Tuning properties of long-wavelength VCSELs have been studied experimentally, for the first time to our knowledge. Injection current and temperature tuning rates of two VCSELs operating near 1,512 and 1,577 nm have been measured using a Fabry-Perot etalon with free spectral range 0.056 cm(-1). A 100-Hz saw-tooth modulation with depths of modulation of approximately 10% or less was superimposed on a direct injection current (dc bias) to tune lasers in narrow spectral intervals (0.3-1.2 cm(-1)) around a central frequency set by the dc bias. The lasers have been found to be capable of being tuned faster at higher levels of dc bias. The enhancement factors were up to approximately 2 and approximately 3 for the 1,512- and 1,577-nm lasers, respectively, as compared with their tuning rates measured at the levels of the dc bias close to the threshold of lasing. A linear dependence between injection current tuning rates and the levels of dc bias has been observed. Temperature tuning coefficients have been proved to be independent of the laser heat sink temperature and of the dc bias. Frequency tuning curves were approximated with a second-order polynomial. The frequencies of more than 40 absorption lines of CO, CO(2), H(2)O and NH(3) kn...Continue Reading

References

Oct 2, 2002·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·E SchlosserV Ebert
Nov 25, 2004·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Heidi CattaneoRolf Hernberg

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Citations

Sep 1, 2006·Photomedicine and Laser Surgery

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