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Abstract
The characterization of a laser diode (LD)-pumped neodymium-doped silica glass (NDSG) laser is here described. The gain performance and wavefront distortion were measured, and the thermal toughness and uniformity distribution of the material were experimentally observed. At a pumping frequency of 1 Hz and energy 7.79 J, a small-signal gain of 1.16 was measured, and the wavefront distortion reached 2.67 λ (wavelength λ = 1053 nm). At a pumping frequency of 25 Hz with 194 W power, the NDSG was still not cracked, which is consistent with its high thermal shock parameter. However, the material uniformity was relatively poor. These results indicate good prospects for the application of NDSG lasers at high energy and high repetition frequency, but the gain performance, uniformity, and other aspects affected by the manufacturing process need to be improved.
Highlights
High-energy and high repetition frequency lasers are urgently required for applications in Optical Parametric Chirped-Pulse Amplification (OPCPA) pump sources, particle acceleration, medical treatment and material processing
Because the neodymium-doped silica glass (NDSG) laser is amplified in a four-level system, the ideal gain can be calculated using
Nd-doped yttrium aluminum garnet (Nd):glass showed thatwas was which deficientdiffered in material uniformity
Summary
High-energy and high repetition frequency lasers are urgently required for applications in Optical Parametric Chirped-Pulse Amplification (OPCPA) pump sources, particle acceleration, medical treatment and material processing. In order to reach high energy and high repetition frequency, the unavoidable accumulation of heat occurs in the gain medium. A part of the energy is used in laser amplification, and most of the energy is absorbed by the medium, generating excessive heat. This will cause the phenomenon of thermal lensing [1,2] with the beam quality affected, but can cause the gain medium to rupture and be damaged
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