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Proceedings Paper

Nonlinear frequency up-conversion for mid-infrared single-photon detection
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Paper Abstract

Remote sensing using mid-infrared wavelength has many applications in pollution surveillance and atmosphere studies. However, high gain, low noise detectors or single photon counters are not available in the mid-infrared wavelength range. One approach to obtain single-photon detection in mid-infrared wavelength is to convert the mid-infrared radiations into visible/near-infrared wavelengths where high efficiency and low dark current detectors are easily available. In this paper, the up-conversion of mid-infrared radiations based on the quasi-phase matching condition of periodically poled lithium niobate (PPLN) is investigated. The bandwidth and efficiency are the two essential parameters for the up-conversion process. The optimal pump wavelength λlasero and PPLN period Λ can be determined from conservations of energy and momentum. Once the λlasero and Λ are defined, the spectral bandwidth corresponding to the full width at half maximum of frequency up-conversion can be calculated. The spectral bandwidth of mid-infrared radiations can exceed 130 nm for a 25 mm PPLN crystal when the pump laser operates in the optimum wavelength. It is wide enough to cover both the on and off wavelengths of the species of interest in a Differential Absorption Lidar. The maximum up-conversion bandwidth usually corresponds to the longest PPLN period allowed by the quasi-phase matching condition. The conversion efficiency increases with the pump laser intensity. Both the external cavity pumping approach with cavity locking technique and the intra-cavity pumping approach can greatly increase the up-conversion efficiency.

Paper Details

Date Published: 12 January 2005
PDF: 8 pages
Proc. SPIE 5653, Lidar Remote Sensing for Industry and Environmental Monitoring V, (12 January 2005); doi: 10.1117/12.579287
Show Author Affiliations
Yingxin Bai, Science Applications International Corp. (United States)
Jirong Yu, NASA Langley Research Ctr. (United States)
Norman P. Barnes, NASA Langley Research Ctr. (United States)
Songsheng Chen, Science Applications International Corp. (United States)
Mulugeta Petros, Science and Technology Corp. (United States)
Hyung R. Lee, Hampton Univ. (United States)


Published in SPIE Proceedings Vol. 5653:
Lidar Remote Sensing for Industry and Environmental Monitoring V
Upendra N. Singh; Kohei Mizutani, Editor(s)

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