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High efficiency mid- and long-wave optical parametric oscillator pump source and its applications
Figure 1 (a) Experimental setup of the Ho: YAG laser pumped by Tm: YLF laser. (b) Wavelengths at different VBG temperature. (c) Measured ZGP wave-tuning idler spectrum. (d) Absorption spectrum of 0.8 at.% doped Ho: YAG at 20C and output power. (Image by AIR)
High efficiency mid- and long-wave optical parametric oscillator pump source and its applications
by Staff Writers
Beijing, China (SPX) Feb 14, 2023

Widely tunable mid-and long-wave infrared (8-12 um) laser belongs to the atmospheric window range and the human eye safety range and has important application requirements in the field of Lidar.

A study published in Scientific Reports describes a high-efficiency mid- and long-wave optical parametric oscillator pump source: Ho: YAG laser, the system achieves high-efficiency 2.1 um laser output by scanning and optimizing the pump laser wavelength.

The research was led by the Laser Engineering Center with the Aerospace Information Research Institute (AIR), Chinese Academy of Sciences (CAS).

According to the temperature tuning characteristics of VBG, the wavelength of Tm: YLF laser continuous tunability ranges from 1906.04-1908.83 nm, corresponding to a linewidth of less than 0.41 nm. By scanning and optimizing the wavelength of the pump light, the Ho: YAG laser output with a light-to-light conversion efficiency of 59.12% and a slope efficiency of 68.26% is achieved under the center wavelength of the pump source of 1907.36 nm.

The research team used the Ho: YAG laser as the pump source of ZGP-OPO and obtained a high-efficiency tunable long-wave infrared laser under type I phase matching, with a tuning range of 8.02-9.15 um.

This research lays the foundation for the development of all-solid-state mid- and long-wave lasers and is expected to greatly expand the Lidar applications.

Related Links
Aerospace Information Research Institute
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