Frequency-locking and threshold current-lowering effects of a quantum cascade laser and an application in gas detection field

doi:10.1088/1674-1056/24/2/024206

Abstract In this paper, the frequency-locking and threshold current-lowering effects of a quantum cascade laser are studied and achieved. Combined with cavity-enhanced absorption spectroscopy, the noninvasive detection of H₂ with a prepared concentration of 500 ppm in multiple dissolved gases is performed and evaluated. The high frequency selectivity of 0.0051 cm^-1 at an acquisition time of 1 s allows the sensitive detection of the (1-0) S(1) band of H₂ with a high accuracy of (96.53± 0.29)% and shows that the detection limit to an absorption line of 4712.9046 cm^-1 is approximately (17.26± 0.63) ppm at an atmospheric pressure and a temperature of 20 ℃.

Keywords: quantum cascade laser frequency locking threshold current lowering cavity-enhanced absorption spectroscopy

Received: 05 June 2014
Revised: 04 August 2014
Accepted manuscript online:

PACS:	42.50.Gy	(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
	42.15.Eq	(Optical system design)
	25.20.Dc	(Photon absorption and scattering)

Fund: Project supported by the Special Funds for the Development of National Major Scientific Instruments and Equipment, China (Grant No. 2012YQ160007) and the National Natural Science Foundation of China (Grant No. 51277185).

Corresponding Authors: Wan Fu
E-mail: wanfuhappy@163.com

Cite this article:

Chen Wei-Gen (陈伟根), Wan Fu (万福), Zou Jing-Xin (邹经鑫), Gu Zhao-Liang (顾朝亮), Zhou Qu (周渠) Frequency-locking and threshold current-lowering effects of a quantum cascade laser and an application in gas detection field 2015 Chin. Phys. B 24 024206

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Frequency-locking and threshold current-lowering effects of a quantum cascade laser and an application in gas detection field

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