Optical detection of terahertz using nonlinear parametric upconversion

摘要

We extend our work to perform sensitive, room-temperature optical detection of terahertz (THz) by usingnnonlinear parametric upconversion. THz radiation at 700 GHz is mixed with pump light at 1550 nm in anbulk GaAs crystal to generate an idler wave at 1555.6 nm. The idler is separated, coupled into optical fiber,nand detected using a gated Geiger-mode avalanche photodiode. The resulting THz detector has a power sen-nsitivity of 4.5 pW/u0001Hz and a timing resolution of 1ns. © 2008 Optical Society of America