Ultra-sensitive mid-wavelength-infrared upconversion detector

作者：Li, Yan^*; He, Yuhang; Wang, Yinqi; He, Weiji; Gu, Guohua; Chen, Qian

来源：Optics and Laser Technology, 2024, 168: 109993.

DOI：10.1016/j.optlastec.2023.109993

• Mid-wavelength-infrared
• Frequency upconversion
• Internal quantum efficiency
• Noise equivalent power

We have proposed and experimentally demonstrated an efficient ultra-sensitive mid-wavelength-infrared (MWIR) detector using a periodically poled lithium niobate nonlinear crystal and a silicon single-photon counting module. The involved frequency upconversion technique can spectrally convert the MWIR signal photons to the short-wavelength-infrared (SWIR) region. The internal quantum efficiency (QE) of the upconversion detector (UPD) reaches 8.87% at an average pump power of 10.67 W. The noise equivalent power of the UPD is measured as 3.24 x 10-15 W/Hz1/2 at the MWIR wavelength of 4.6 mu m. In addition, the long-term stability is manifested by at least 12 h of operation with a relative fluctuation in the count rates as low as 0.35%.

• 单位
  y; 南京理工大学