Video rate imaging of narrow band THz radiation based on frequency upconversion

Patrick F. Tekavec; Vladimir G. Kozlov; Ian Mcnee; Igor E. Spektor; Sergey P. Lebedev

doi:10.1117/12.2080379

14 March 2015 Video rate imaging of narrow band THz radiation based on frequency upconversion

Patrick F. Tekavec, Vladimir G. Kozlov, Ian Mcnee, Igor E. Spektor, Sergey P. Lebedev

Proceedings Volume 9362, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VIII; 93620I (2015) https://doi.org/10.1117/12.2080379
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

We demonstrate video rate THz imaging by detecting a frequency upconverted signal with a CMOS camera. A fiber laser pumped, double resonant optical parametric oscillator generates THz pulses via difference frequency generation in a quasi-phasematched gallium arsenide (QPM-GaAs) crystal located inside the OPO cavity. The output produced THz pulses centered at 1.5 THz, with an average power up to 1 mW, a linewidth of <100 GHz, and peak power of >2 W. By mixing the THz pulses with a portion of the fiber laser pump (1064 nm) in a second QPM-GaAs crystal, distinct sidebands are observed at 1058 nm and 1070 nm, corresponding to sum and difference frequency generation of the pump pule with the THz pulse. By using a polarizer and long pass filter, the strong pump light can be removed, leaving a nearly background free signal at 1070 nm. For imaging, a Fourier imaging geometry is used, with the object illuminated by the THz beam located one focal length from the GaAs crystal. The spatial Fourier transform is upconverted with a large diameter pump beam, after which a second lens inverse transforms the upconverted spatial components, and the image is detected with a CMOS camera. We have obtained video rate images with spatial resolution of 1mm and field of view ca. 20 mm in diameter without any post processing of the data.

Citation Download Citation

Patrick F. Tekavec, Vladimir G. Kozlov, Ian Mcnee, Igor E. Spektor, and Sergey P. Lebedev "Video rate imaging of narrow band THz radiation based on frequency upconversion", Proc. SPIE 9362, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VIII, 93620I (14 March 2015); https://doi.org/10.1117/12.2080379

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