Novel surface-sensitive diode lasers for chemical detection

K. Peter Lo; Howard P. Groger; Shufang Luo; Russell J. Churchill

doi:10.1117/12.319635

19 August 1998 Novel surface-sensitive diode lasers for chemical detection

K. Peter Lo, Howard P. Groger, Shufang Luo, Russell J. Churchill

Proceedings Volume 3547, Semiconductor Lasers III; (1998) https://doi.org/10.1117/12.319635
Event: Photonics China '98, 1998, Beijing, China

Abstract

A novel near-infrared diode laser having sensitivity to change of absorption and refractive index at its surface- sensitive region is presented. This semiconductor laser utilizes an AlGaAs single quantum well structure emitting at a wavelength of 950 nm, and its dimensions are 1 mm X 0.5 mm X 0.2 mm. One of the cladding layers is thinned such that the evanescent wave in the quantum well interacts with a surface-sensitive region on the laser. A theoretical model of laser sensitivity toward changes in absorption of a dye- doped polymer coating is formulated. Experimental data using the surface-sensitive diode laser for sensing ammonia and adsorbed monolayers of molecular films are presented. The output power, threshold current and wavelength are shown to be affected by the changes in the adsorbed coating.

Citation Download Citation

K. Peter Lo, Howard P. Groger, Shufang Luo, and Russell J. Churchill "Novel surface-sensitive diode lasers for chemical detection", Proc. SPIE 3547, Semiconductor Lasers III, (19 August 1998); https://doi.org/10.1117/12.319635

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