Direct comb multi-heterodyne interference spectroscopy

Keunwoo Lee; Jaehyeon Lee; Young-Jin Kim; Seung-Woo Kim

doi:10.1117/12.2270783

13 June 2017 Direct comb multi-heterodyne interference spectroscopy

Keunwoo Lee, Jaehyeon Lee, Young-Jin Kim, Seung-Woo Kim

Proceedings Volume 10449, Fifth International Conference on Optical and Photonics Engineering; 104491Y (2017) https://doi.org/10.1117/12.2270783
Event: Fifth International Conference on Optical and Photonics Engineering, 2017, Singapore, Singapore

Abstract

We present a comb-based spectroscopic method that enables simultaneous detections of multiple gases by adopting an erbium-doped fiber femtosecond laser as a single broadband probing beam. The method takes multiple continuous-wave diode lasers as the frequency references, each being assigned to its distinct gas absorption line. The interference of the probing femtosecond laser with the diode lasers produces multi-heterodyne beats in the radio frequency domain, which are captured using a high-speed photodetector and electronically processed to identify the absorption lines of interest with a comb-mode spectral resolution. The experimental result of this study demonstrates that two gas absorption lines of H¹³CN and ¹²CO₂, separated by a 23 nm spectral offset, can be detected concurrently at a 10 μs update rate with a 100 kHz spectral resolution. The proposed method finds applications in not only fundamental spectral line measurements for atomic and molecular physics but also diverse practical uses for remote sensing of trace and toxic gas molecules.

Citation Download Citation

Keunwoo Lee, Jaehyeon Lee, Young-Jin Kim, and Seung-Woo Kim "Direct comb multi-heterodyne interference spectroscopy", Proc. SPIE 10449, Fifth International Conference on Optical and Photonics Engineering, 104491Y (13 June 2017); https://doi.org/10.1117/12.2270783

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