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

David Tatrai; Zoltan Bozoki; Gábor Szabó

doi:10.1117/1.OE.52.9.096104

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 <2 s execution time if the optical absorption coefficient at the peak of the absorption line is at least 2×10 ⁻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.

Citation Download Citation

David Tatrai, David Tatrai, Zoltan Bozoki, Zoltan Bozoki, Gábor Szabó, Gábor Szabó, } "Method for wavelength locking of tunable diode lasers based on photoacoustic spectroscopy," Optical Engineering 52(9), 096104 (6 September 2013). https://doi.org/10.1117/1.OE.52.9.096104 . Submission:

ACCESS THE FULL ARTICLE

PERSONAL SIGN IN
Full access may be available with your subscription

Email or Username Forgot your username?

Password Forgot your password?

Show

Remember Email/Username on this computer

Remember Password

No SPIE account? Create an account
or Institutional Sign In via Shibboleth

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $20.00

Non-members: $25.00 ADD TO CART

Show All Keywords

Keywords/Phrases

Search In:

Publication Years