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This paper demonstrates a laser diode double-ended pumped Yb: YAG rod regenerative amplifier (RA) with an average power of 37 W, which substantially exceeds the performance of previously reported bulk Yb: YAG medium RAs. Compared to other bulk Yb: YAG medium RAs, we have introduced several enhancements in thermal management, such as employing a double-ended pump to reduce the temperature gradient inside the crystal, and the cooling efficiency is significantly enhanced by designed heat sink. As a result, the thermal effect is effectively suppressed. The system attains high average output power and power stability (RMS = 0.56%) at a pulse repetition rate of 400 kHz. In addition, the output beam maintains excellent quality even under varying high pump powers, demonstrating an M 2 consistently below 1.1. [ABSTRACT FROM AUTHOR]

The pulse duration of a burst-mode 100 W Nd-doped picosecond amplifier is nonlinearly compressed in a multi-pass cell device. The spectral broadening and pulse compression are investigated theoretically. The spectral bandwidth is broadened from 0.13 to 3.28 nm experimentally, corresponding to a broadening factor of 25.2. The pulse duration is compressed from 14.2 to 0.99 ps, corresponding to a compression factor of 14.3. The compressed pulse duration of four successive pulses are theoretically estimated to be 0.98 ps, 1.47 ps, 1.86 ps, and 3.07 ps, respectively. The laser power after the grating pair compressor is 72 W. Therefore, the total efficiency of our system reaches 72%. The beam quality after the MPC unit is almost preserved with a M2 value of 1.38 × 1.40. [ABSTRACT FROM AUTHOR]

The original article can be found online at https://doi.org/10.1007/s00340-023-08032-9. B Correction to: Applied Physics B (2023) 129:86 b https://doi.org/10.1007/s00340-023-08032-9 The funding information has been incorrectly published in the original publication. [Extracted from the article]