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Real-time imaging using a 4.3-THz quantum cascade laser and a 320 /spl times/ 240 microbolometer focal-plane array

IEEE Photonics Technology Letters · 2006 · Vol. 18(13) · pp. 1415–1417

A.W.M. Lee✉(Massachusetts Institute of Technology)B.S. WilSushil Kumar(Massachusetts Institute of Technology)Qing Hu(Massachusetts Institute of Technology)John L. Reno(Sandia National Laboratories)

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Abstract

We report the use of a ~50-mW peak power 4.3-THz quantum cascade laser (QCL) as an illumination source for real-time imaging with a 320 times 240 element room-temperature microbolometer focal-plane array detector. The QCL is modulated synchronously with the focal-plane array for differential imaging. Signal-to-noise ratios of ~340 are achieved at a 20-frame/s acquisition rate, and the optical noise equivalent power of the detector array at 4.3 THz is estimated to be ~320 pW/radicHz. Both reflection and transmission mode imaging are demonstrated

Spectroscopy and Laser Applications Terahertz technology and applications Photonic and Optical DevicesMicrobolometerCardinal pointOpticsQuantum cascade laserTerahertz radiationDetectorLaserFrame rateBolometerOptoelectronics

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