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Tunable Diode Laser Absorption Spectroscopy Detection of N2O at 2.1μm Using Antimonide Laser and InGaAs Photodiode |
| ZHANG Yong-Gang;ZHANG Xiao-Jun;ZHU Xiang-Rong;LI Ai-Zhen;LIU Sheng |
| State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050 |
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| Cite this article: |
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ZHANG Yong-Gang, ZHANG Xiao-Jun, ZHU Xiang-Rong et al 2007 Chin. Phys. Lett. 24 2301-2303 |
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Abstract Tunable diode laser absorption spectroscopy detection of N2O around 2.1μm is demonstrated by using a homemade InGaAsSb/AlGaAsSb MQW laser diode and an InGaAs wavelength extended photodiode. Details of the devices and the detection system are described. In the system, the laser is driven by low frequency pulses with long duration to form a wavelength scan around 4741cm-1; the absorption information is obtained from the detected signal of the photodiode. By using a gas cell with 15cm path length, a detection limit is estimated to be smaller than 0.2Torr.
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| Keywords:
52.25.Rv
42.55.Px
85.60.Dw
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Received: 26 December 2006
Published: 25 July 2007
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