Method for wavelength locking of tunable diode lasers based on photoacoustic spectroscopy

Dávid Tátrai, Z. Bozóki, Gábor Szabó

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A new wavelength locking method for tunable diode lasers based on a photoacoustic (PA) detection unit is presented. A wavelength modulated laser is repeatedly tuned over an absorption line of a small molecule in the gaseous phase and the generated PA signal is recorded. In the phase variation curve of the recorded PA signal, there is a 180-deg phase reversal around the peak of the absorption line, and the corresponding inflection point is a characteristic wavelength feature to be used for wavelength locking. An automated algorithm has been developed, which has ¢5 cm¢1. With this algorithm, the wavelength of a near-infrared distributed feedback diode laser can be locked with an absolute accuracy of 60 fm (i.e., relative accuracy of 4 × 10¢8) or better even at atmospheric sample gas pressure. As there is no need to stabilize the gas pressure or temperature or the concentration of the light absorbing component and the PA detection unit can be easily integrated into various experimental setups, the proposed method has the potential to be applicable even under demanding industrial or field conditions.

Original languageEnglish
Article number130777
JournalOptical Engineering
Volume52
Issue number9
DOIs
Publication statusPublished - Sep 2013

Fingerprint

Photoacoustic spectroscopy
photoacoustic spectroscopy
Photoacoustic effect
locking
Semiconductor lasers
semiconductor lasers
Wavelength
wavelengths
gas pressure
inflection points
gas temperature
Gases
Infrared radiation
Feedback
Molecules
Lasers
curves
lasers
molecules

Keywords

  • Distributed feedback diode laser
  • Photoacoustic spectroscopy
  • Wavelength locking

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)

Cite this

Method for wavelength locking of tunable diode lasers based on photoacoustic spectroscopy. / Tátrai, Dávid; Bozóki, Z.; Szabó, Gábor.

In: Optical Engineering, Vol. 52, No. 9, 130777, 09.2013.

Research output: Contribution to journalArticle

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