Dual-wavelength Nd:YAG laser operation at 1319 and 1338 nm by direct pumping at 885 nm

Optical Crystals for 1.3 μm All-Solid-State Passively Q-Switched Laser

In recent years, optical crystals for 1.3 μm all-solid-state passively Q-switched lasers have been widely studied due to their eye-safe band, atmospheric transmission characteristics, compactness, and low cost. They are widely used in the fields of high-precision laser radar, biomedical applications, and fine processing. In this review, we focus on three types of optical crystals used as the 1.3 μm laser gain media: neodymium-doped vanadate (Nd:YVO4, Nd:GdVO4, Nd:LuVO4, neodymium-doped aluminum-containing garnet (Nd:YAG, Nd:LuAG), and neodymium-doped gallium-containing garnet (Nd:GGG, Nd:GAGG, Nd:LGGG). In addition, other crystals such as Nd:KGW, Nd:YAP, Nd:YLF, and Nd:LLF are also discussed. First, we introduce the properties of the abovementioned 1.3 μm laser crystals. Then, the recent advances in domestic and foreign research on these optical crystals are summarized. Finally, the future challenges and development trend of 1.3 μm laser crystals are proposed. We believe this review will provide a comprehensive understanding of the optical crystals for 1.3 μm all-solid-state passively Q-switched lasers.

Dual-wavelength TEM01 mode passively mode-locked Nd:YAG laser witha semiconductor saturable absorber mirror

A dual-wavelength ${{\rm TEM}_{01}}$TEM₀₁ mode synchronous continuous wave passively mode-locked (CWML) Nd:YAG laser has been demonstrated for the first time to the best of our knowledge with a semiconductor saturable absorber mirror (SESAM) at 1319 and 1338 nm. The maximum average output power of 10.84 W was obtained at a 113.8 W absorbed pump power, corresponding to an optical-to-optical conversion efficiency of 9.5%. The dual-wavelength CWML pulses had a pulse duration of 35.1 ps at a repetition rate of 76 MHz. The beam quality was measured to be ${{\rm M}^2} = {2.51}$M²=2.51.