You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither SPIE nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the SPIE website.
6 September 2013Method for wavelength locking of tunable diode lasers based on photoacoustic spectroscopy
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.
The alert did not successfully save. Please try again later.
David Tatrai, Zoltan Bozoki, Gábor Szabó, "Method for wavelength locking of tunable diode lasers based on photoacoustic spectroscopy," Opt. Eng. 52(9) 096104 (6 September 2013) https://doi.org/10.1117/1.OE.52.9.096104