Multi-Beam Large Fundamental Mode Neodymium Glass Regenerative Amplifier With Uniform Performance

Abstract

In this study, the designing method of multi-beam regenerative amplifiers with the repetitive rate was proposed and demonstrated. To obtain multi-beam regenerative amplifiers with uniform performance, the disparities in output energy, energy stability, and mode size were analyzed, and the detailed optimizing method was presented. With the designs, eight-beam regenerative amplifiers were developed. The output performances of eight-beam regenerative amplifiers were uniform. The output energies were in the range of 25.4–28.8 mJ, and the energy stabilities over two hours were in the range of 2.4%–5.1% (PV) and 0.3%–0.9% (RMS).

Investigation of the photothermal weak absorption and laser damage characteristics of a Nd,Y:SrF2 crystal

“…Despite the fact that the fruitful efforts in increasing laser pulse energy focus on Yb 3+ -doped materials whose energy level configuration is more suitable for the laser diode (LD) scheme, 10 the development of Nd 3+ -doped gain materials has frequently been proposed recently because a saturation fluence of around 5 J cm −2 is easier to achieve in the latter category. 11,12 This saturation fluence is within the typical range of Nd 3+ -doped phosphate glasses, 13,14 i.e., the most important gain medium for high-energy laser facilities, 12,15 and is considered beneficial for generating energy pulses with high energies without increasing the risk of damaging laser gain materials. In this case, Nd 3+ -doped laser gain materials with a moderate saturation fluence and high thermal conductivity, e.g., Nd:LuAG, 16 Nd:CaF 2 (ref.…”