Generation of broadly tunable picosecond mid-infrared laser and sensitive detection of a mid-infrared signal by parametric frequency up-conversion in MgO:LiNbO<sub>3</sub> optical parametric amplifiers |
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| Authors: | Zhang Qiu-Lin a Zhang Jing a Qiu Kang-Sheng a Zhang Dong-Xiang a Feng Bao-Hua a and Zhang Jing-Yuan |
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| Affiliation: | Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences;Department of Physics,Georgia Southern University |
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| Abstract: | Picosecond optical parametric generation and amplification in the near-infrared region within 1.361-1.656 μm and the mid-infrared region within 2.976-4.875 μm is constructed on the basis of bulk MgO:LiNbO 3 crystals pumped at 1.064 μm.The maximum pulse energy reaches 1.3 mJ at 1.464 μm and 0.47 mJ at 3.894 μm,corresponding to a pumpto-idler photon conversion efficiency of 25%.By seeding the hard-to-measure mid-infrared radiation as the idler in the optical parametric amplification and measuring the amplified and frequency up-converted signal in the near-infrared or even visible region,one can measure very week mid-infrared radiation with ordinary detectors,which are insensitive to mid-infrared radiation,with a very high gain.A maximum gain factor of about 7 × 10 7 is achieved at the mid-infrared wavelength of 3.374 μm and the corresponding energy detection limit is as low as about 390 aJ per pulse. |
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| Keywords: | optical parametric amplifiers picoseconds mid-infrared laser sensitive detection |
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