Applied Physics B

, Volume 108, Issue 4, pp 721–725

Doppler-limited H2O and HF absorption spectroscopy by sweeping the 1,321–1,354 nm range at 55 kHz repetition rate using a single-mode MEMS-tunable VCSEL

  • B. A. Stein
  • V. Jayaraman
  • J. Y. Jiang
  • A. Cable
  • S. T. Sanders
Rapid Communication

Abstract

A single longitudinal mode micro-electro-mechanical system-tunable vertical cavity surface-emitting laser (VCSEL) was used to measure H\(_{2}\)O and HF absorption spectra in the 1,321–1,354 nm range at 55 kHz repetition rate (\(\sim \)740 MHz/ns tuning rate). Pulse delay referencing was used to achieve an absorbance noise level of 0.004 (RMS), within a factor of 2.6 of the shot noise limit. The measured linewidths approach the low-pressure feature linewidths (\(\sim\)790 MHz) characteristic of the gases studied, highlighting the single-mode nature of the VCSEL throughout each rapid wavelength sweep. At even higher tuning rates, molecular features became asymmetric and broad, consistent with rapid passage and Fourier effects.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • B. A. Stein
    • 1
  • V. Jayaraman
    • 2
  • J. Y. Jiang
    • 3
  • A. Cable
    • 3
  • S. T. Sanders
    • 1
  1. 1.University of Wisconsin-MadisonMadisonUSA
  2. 2.Praevium Research, Inc.Santa BarbaraUSA
  3. 3.Thorlabs, Inc.NewtonUSA

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