Diode-based difference-frequency pulsed laser photo-acoustic system for trace gas sensing

Author

Fischer, Claudia ; Yu, Qian ; Seiter, M. ; Sigrist, M.

Author_Institution

Inst. for Quantum Electron., Swiss Fed. Inst. of Technol., Zurich, Switzerland

fYear

2001

fDate

11-11 May 2001

Firstpage

521

Lastpage

522

Abstract

Summary form only given. Many trace gases, particularly volatile organic compounds, have their fundamental absorption lines in the mid-infrared region of the electromagnetic spectrum around 3.3 /spl mu/m. In order to be able to detect these trace gases, e.g. for environmental sensing, broadly tunable narrowband laser sources are needed. The source used in this study is based on difference-frequency generation (DFG). We employ a diode-pumped pulsed Nd:YAG laser as pump beam and a continuous-wave external cavity diode laser tunable between 1550 and 1610 nm as signal beam. An antireflex-coated PPLN is used for DFG. We present to our best knowledge the first photo-acoustic measurements performed with such a system.

Keywords

air pollution measurement; gas sensors; laser tuning; optical frequency conversion; photoacoustic spectroscopy; CW external cavity diode laser; continuous tuning range; conversion efficiency; diode-based difference-frequency generation; diode-pumped pulsed Nd:YAG laser; methane detection; periodically poled crystal; pulsed laser photoacoustic system; trace gas sensing; volatile organic compounds; Diodes; Electromagnetic wave absorption; Gas lasers; Gases; Laser beams; Laser excitation; Optical pulses; Pump lasers; Tunable circuits and devices; Volatile organic compounds;

fLanguage

English

Publisher

ieee

Conference_Titel

Lasers and Electro-Optics, 2001. CLEO '01. Technical Digest. Summaries of papers presented at the Conference on

Conference_Location

Baltimore, MD, USA

Print_ISBN

1-55752-662-1

Type

conf

DOI

10.1109/CLEO.2001.948122

Filename

948122