High-Efficiency Broadband Near-Infrared Single-Photon Frequency Upconversion and Detection

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2020,（3）
• 页码范围: 17-21
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/0256-307X/37/3/034202

摘要

We propose and demonstrate a high efficiency broadband near infrared single-photon upconversion and detection with a broadband pump laser based on sum frequency conversion in the PPLN crystal.By using a pump laser centered at 1040nm with a spectral bandwidth of 10nm,the signal single-photons centered at 1562nm with a broadband bandwidth up to 7.2nm are frequency-converted from the near infrared to the visible regime.A maximum conversion efficiency of 18.8％ is achieved,while the background noise is measured to be only 1.2 × 10-3 counts/pulse.The corresponding spectral linewidth of the upconverted photons is 0.2nm.This scheme of broadband infrared single-photon upconversion and detection provides potential solutions in infrared laser ranging,broadband infrared imaging and quantum key distribution.