Quantitative metrics of efficacy of higher harmonic detection in wavelength modulation spectroscopy for precision measurements

Mohammad A. Khan; Amin N. Dharamsi

doi:10.1117/12.529103

16 June 2004 Quantitative metrics of efficacy of higher harmonic detection in wavelength modulation spectroscopy for precision measurements

Mohammad A. Khan, Amin N. Dharamsi

Author Affiliations +

Proceedings Volume 5364, Vertical-Cavity Surface-Emitting Lasers VIII; (2004) https://doi.org/10.1117/12.529103
Event: Integrated Optoelectronic Devices 2004, 2004, San Jose, CA, United States

Abstract

A quantitative analysis of Wavelength Modulation Spectroscopy (WMS) signals at various harmonic detection orders for use in precision, non-intrusive measurements is performed. A theoretical analysis of fitting of WMS signals is developed. The detailed structures of WMS signals at various harmonic detection orders are studied and analyzed, using statistical measures. It is shown that the variance of errors increases with mesmatches in linewidth in a particular (N^th order) harmonic signal. However, this rate of increase in variance is characteristic of the harmonic detection order used, thereby demonstrating the advantage in measurements at different harmonics. It is shown that for a constant error in estimation of linewidth of a profile, the variance of errors can be higher for higher detection orders. Therefore, mismatches in fits are more prominent at some optimal detection order. The methods developed can be used to examine subtle effects such as Dicke narrowing in certain molecular spectra. These small perturbations of lineshape profile reveal details of the molecular collision kinetics, and hence yield precise measurements that are difficult to achieve by other techniques.

Citation Download Citation

Mohammad A. Khan and Amin N. Dharamsi "Quantitative metrics of efficacy of higher harmonic detection in wavelength modulation spectroscopy for precision measurements", Proc. SPIE 5364, Vertical-Cavity Surface-Emitting Lasers VIII, (16 June 2004); https://doi.org/10.1117/12.529103

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

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