Frequency Up-Conversion Imaging with 60 dB Gain Using Picosecond Optical Parametric Amplifier
Chinese Optics Letters
A weak infrared (IR) image amplifier with more than 60-dB optical gain and frequency up-conversion is developed from a picosecond (PS) 355-nm pumped gated optical parametric amplifier (OPA) in a \beta- BaB2O4 (BBO) crystal. The IR image at 1064 nm is amplified and up-converted into the visible region at 532 nm by parametric amplification and up-conversion. With the optimized optical gain, the lowest detectable energy of the image can be as low as 1.8 femto-Joule per pulse, which is three orders of magnitude lower than the detection limit of a charge-coupled device (CCD) camera. The transversal resolution of the OPA imaging is investigated, and the approaches for higher detection sensitivity and higher transversal resolution are proposed.
Li, Xiaoqing, Jing Yang, Xinzhi Sheng, Jing-Yuan Zhang, Da-Fu Cui, Qin-Jun Peng, Zu-Yan Xu.
"Frequency Up-Conversion Imaging with 60 dB Gain Using Picosecond Optical Parametric Amplifier."
Chinese Optics Letters, 11 (11).