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


    • University of Wisconsin-Madison
  • V. Jayaraman
    • Praevium Research, Inc.
  • J. Y. Jiang
    • Thorlabs, Inc.
  • A. Cable
    • Thorlabs, Inc.
  • S. T. Sanders
    • University of Wisconsin-Madison
Rapid Communication

DOI: 10.1007/s00340-012-5135-1

Cite this article as:
Stein, B.A., Jayaraman, V., Jiang, J.Y. et al. Appl. Phys. B (2012) 108: 721. doi:10.1007/s00340-012-5135-1


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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© Springer-Verlag 2012