Optical detection of terahertz using nonlinear parametric upconversion
2008; Optica Publishing Group; Volume: 33; Issue: 23 Linguagem: Inglês
10.1364/ol.33.002725
ISSN1539-4794
AutoresM. Jalal Khan, Jerry C. Chen, Sumanth Kaushik,
Tópico(s)Gyrotron and Vacuum Electronics Research
ResumoWe extend our work to perform sensitive, room-temperature optical detection of terahertz (THz) by using nonlinear parametric upconversion. THz radiation at 700 GHz is mixed with pump light at 1550 nm in a bulk GaAs crystal to generate an idler wave at 1555.6 nm. The idler is separated, coupled into optical fiber, and detected using a gated Geiger-mode avalanche photodiode. The resulting THz detector has a power sensitivity of 4.5 pW/Hz and a timing resolution of 1 ns.
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