Universiti Teknologi Malaysia Institutional Repository

Finely tunable laser based on a bulk silicon wafer for gas sensing applications

Gallegos-Arellano, E. and Vargas-Rodriguez, E. and Guzman-Chavez, A. D. and Cano-Contreras, M. and Cruz, J. L. and Raja-Ibrahim, R. K. (2016) Finely tunable laser based on a bulk silicon wafer for gas sensing applications. Laser Physics Letters, 13 (6). ISSN 1612-2011

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In this work a very simple continuously tunable laser based on an erbium ring cavity and a silicon wafer is presented. This laser can be tuned with very fine steps, which is a compulsory characteristic for gas sensing applications. Moreover the laser is free of mode hopping within a spectral range sufficiently wide to match one of the ro-vibrational lines of a target molecule. Here the proposed laser reached, at ∼1530 nm, a continuous tuning range of around 950 pm (>100 GHz) before mode hopping occurred, when a silicon wafer of 355 μm thickness was used. Additionally, the laser can be finely tuned with small tuning steps of <12 pm, achieving a resolution of 84.6 pm °C-1 and by using a thermo-electric cooler (TEC) the laser showed a high wavelength stability over time. These tuning characteristics are sufficient to detect molecules such as acetylene in which the mean separation between two ro-vibrational lines is around 600 pm. Finally, it is shown that the tuning range can be modified by using wafers with different thickness.

Item Type:Article
Uncontrolled Keywords:Fabry-Perot interferometer, gas sensing mode, hopping thermo-optic, effect, tunable laser, wavelength selecting filter
Subjects:Q Science > QC Physics
ID Code:72510
Deposited By: Haliza Zainal
Deposited On:27 Nov 2017 01:34
Last Modified:27 Nov 2017 01:34

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