Sampled grating DBR laser as a spectroscopic source in multigas detection at 1.52-1.57 μm

Author

Boylan, K. ; Weldon, V. ; McDonald, D. ; O´Gorman, J. ; Hegarty, J.

Author_Institution

Dept. of Phys., Trinity Coll., Dublin, Ireland

Volume

148

Issue

1

fYear

2001

fDate

6/23/1905 12:00:00 AM

Firstpage

19

Lastpage

24

Abstract

The first application is reported of multigas sensing using a widely tuneable sampled grating DBR laser with a tuning range 1520⩽λ⩽1570 nm. The laser diode consists of four independently biased sections, two sampled gratings, a phase section and a gain section. Setting the laser emission wavelength within its broad tuning range is achieved by tuning the front and back grating mirrors. Three gases H₂S, C₂H₂ and CO₂ with absorption features within the 30 nm tuning range of the device were targeted and successfully detected. In addition, minimum detection limits were estimated using wavelength modulation spectroscopy. Initial results demonstrate the value of this device as a light source in absorption spectroscopy based multigas detection systems

Keywords

carbon compounds; diffraction gratings; distributed Bragg reflector lasers; hydrogen compounds; infrared spectroscopy; laser tuning; modulation spectroscopy; organic compounds; pollution measurement; process monitoring; remote sensing by laser beam; semiconductor lasers; spectrochemical analysis; spectroscopic light sources; 1.52 to 1.57 mum; C₂H₂; CO₂; H₂S; absorption features; absorption spectroscopy based multigas detection systems; acetylene; back grating mirrors; broad tuning range; four independently biased sections; front grating mirrors; gain section; laser diode; laser emission wavelength; light source; minimum detection limits; multigas detection; multigas sensing; phase section; sampled grating DBR laser; spectroscopic source; wavelength modulation spectroscopy; widely tuneable laser;

fLanguage

English

Journal_Title

Optoelectronics, IEE Proceedings -

Publisher

iet

ISSN

1350-2433

Type

jour

DOI

10.1049/ip-opt:20010191

Filename

914417