Phys.org May 30, 2024 Researchers in China demonstrated a 978 nm laser diode (LD) side-pumped YSGG/Er:YSGG/YSGG composite crystal with a size of Ф 3 mm × 65 mm and continuous-wave (CW) mode. By optimizing resonator length and output mirror transmittance, a maximum output power of 28.02 W was generated, corresponding to slope efficiency of 17.55% and optical-optical efficiency of 12.29%, respectively. The thermal focal lengths were obtained by resonator stability condition. The laser wavelength was centered near 2.8 µm. Moreover, the beam quality factors 2/2 were fitted to be 8.14 and 7.35, respectively. The results indicated that a high-performance 2.8 µm CW laser could […]
Tag Archives: Mid-infrared laser
Widely tunable and high resolution mid-infrared laser based on optical parametric oscillator
Phys.org October 18, 2023 A widely tunable and high resolution mid-infrared radiation source operating in the 3–5 µm region has been applied to numerous frontier applications. However, due to the narrow absorption peak linewidth of atmospheric molecules, it is necessary to strictly align the output wavelength with the target wavelength, which requires high wavelength resolution. Researchers in China tuned the temperature and angle of BaGa4Se7 (BGSe) crystals simultaneously placing the crystals in a temperature-controlled furnace, and placed the furnace on an electric rotary platform. This scheme achieved both wide-range wavelength tuning and high-resolution wavelength tuning with stable output wavelength. It […]