Long-wave infrared ZnGeP2 optical parametric oscillator with improved tunability by use of a cavity compensation technique

Gain Measurement of ZnGeP2 Optical Parametric Oscillator Pulses in a High-Pressure CO2 Amplifier

“…The experimental setup is shown in Figure 1. The seed pulses were generated using a ZGP OPO that was constructed in-house [15]. The oscillator was pumped using a 23.03 W Q-switched Ho:YAG laser with a wavelength of 2.1 µm and a type-I phase matching angle.…”

Ho:YAG laser at 2097 nm pumped by a narrow linewidth tunable 1.91 μm laser

“…A 2.1 μm laser is located in the atmospheric window and widely used in applications such as laser medical 1 , material processing 2 , optical communication lidar detection and ranging systems 3 , and the optical parametric oscillators 4 , 5 . At present, the main approach to obtain lasers with wavelengths at 2.1 μm is to pump a Ho-doped crystal with a 1.9 μm laser that coincides with the absorption wavelength peak of Ho-doped crystal.…”

“…The output power of the Ho:YAG laser is between 21.04 and 23.53 W and the slope efficiency is between 64.08 and 68.26% at the pump power of 39.8 W. The output power and slope efficiency corresponding to the pump wavelength of 1907.36 nm are 23.53 W and 68.26%, respectively. This study illustrates that fine-tuning the pump wavelength is an effective way to improve the slope efficiency and output power of the Ho:YAG laser at room temperature.A 2.1 μm laser is located in the atmospheric window and widely used in applications such as laser medical 1 , material processing 2 , optical communication lidar detection and ranging systems 3 , and the optical parametric oscillators 4,5 . At present, the main approach to obtain lasers with wavelengths at 2.1 μm is to pump a Ho-doped crystal with a 1.9 μm laser that coincides with the absorption wavelength peak of Ho-doped crystal.…”