Numerical study of a thermally-compensated high-energy double-pass Nd:YAG amplifier design

Jeong, Jihoon; Cho, Seryeyohan; Kim, Taeshin; Tao, Yu

doi:10.3938/jkps.68.653

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…Thus, the residual thermal depolarization does not constitute a problem anymore, but it should be kept in mind that the imperfect compensation of depolarization is likely to damage optical elements. In these experiments, we confirm that, to improve the compensation performance, the thermal lens and thermal depolarization should be compensated together [20] .…”

Section: Thermal Effect Compensation Of Laser Headssupporting

confidence: 63%

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High-power, Joule-class, temporally shaped multi-pass ring laser amplifier with two Nd:glass laser heads

Guo

Hui

Huang

et al. 2019

High Pow Laser Sci Eng

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A high-power, Joule-class, nanosecond temporally shaped multi-pass ring laser amplifier system with two neodymium-doped phosphate glass (Nd:glass) laser heads is demonstrated. The laser amplifier system consists of three parts: an all-fiber structure seeder, a diode-pumped Nd:glass regenerative amplifier and a multi-pass ring amplifier, where the thermally induced depolarization of two laser heads is studied experimentally and theoretically. Following the injection of a square pulse with the pulse energy of 0.9 mJ and pulse width of 6 ns, a 0.969-J high-energy laser pulse at 1 Hz was generated, which had the ability to change the waveform arbitrarily, based on the all-fiber structure front end. The experimental results show that the proposed laser system is promising to be adopted in the preamplifier of high-power laser facilities.

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Section: Thermal Effect Compensation Of Laser Headssupporting

confidence: 63%

“…To understand the process of thermal depolarization compensation, single-pass thermal depolarization after compensation was simulated and measured following the method in Ref. [20]. In Figure 4, the top and bottom panels show the simulated and experimentally measured residual thermal depolarization.…”

Section: Thermal Effect Compensation Of Laser Headsmentioning

confidence: 99%

High-power, Joule-class, temporally shaped multi-pass ring laser amplifier with two Nd:glass laser heads

Guo

Hui

Huang

et al. 2019

High Pow Laser Sci Eng

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“…The thermally induced birefringence will lead to severe thermal depolarization and limit the output energy of picosecond laser source when the linearly polarized laser beam passes through the Nd:YAG crystal. Therefore, the compensation of the thermally induced birefringence is a significant issue that needs to be solved for the 10 mJ-level hundred-picosecond laser source, especially in a double-pass laser amplifier [35][36][37]. This is because, in the double-pass amplifier, the generated thermal depolarization power will be reflected back to the pre-stage regenerative amplifier, thereby damaging the optical components.…”

Section: Compensation For Self-focusing and Thermally Induced Birefri...mentioning

confidence: 99%

Compact 15 mJ Fiber–Solid Hybrid Hundred-Picosecond Laser Source for Laser Ablation on Copper

Wang

Zhao

et al. 2022

Applied Sciences

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We report on a millijoule-level fiber–solid hybrid hundred-picosecond laser system with a stable performance and compact structure. The laser system is based on a master oscillator power amplifier structure containing an all-fiber master oscillator, a quasi-continuous-wave side-pumped Nd:YAG regenerative amplifier, and a double-pass amplifier. By using the filtering effect of fiber Bragg grating and the dispersion characteristics of single-mode fiber stretcher, the spectrum broadening caused by self-phase modulation effect is effectively suppressed. Thus, the gain linewidth of the Yb-doped fiber seed source and Nd:YAG laser amplifiers is accurately matched. The reason for thermally induced depolarization in the solid-state laser amplifier is theoretically analyzed, and a more flexible depolarization compensation structure is adopted in amplifier experiment. Furthermore, the pulse energy of 14.58 mJ and pulse width of 228 ps is achieved at 500 Hz repetition rate. The central wavelength is 1064.1 nm with a 3 dB bandwidth of 0.47 nm. The beam quality factors in the horizontal and vertical directions are 1.49 and 1.51, respectively. This laser system has a simple and compact structure and has a power stability of 1.9%. The high pulse energy and beam quality of this hundred-picosecond laser are confirmed by latter theoretical simulation of copper laser ablation. It is a very practical laser system for material processing and laser-induced damage.

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“…To resolve this contradiction, an iterative algorithm is employed, as follows: first, calculate I in under the assumption of = A low flashing rate (1 Hz) is used, so that the thermal lens has the focal length (approximately 70 m) much longer than amplifier length (0.51 m) and the depolarization loss 26) become negligible without additional divergence control. 27,28) Before the amplification measurement, the saturation threshold 8) is measured. By measuring the pump power that the saturation of the amplifier starts without the seed pulse for the cases of with and without the SA, the allowable pumping ranges can be determined, and the fundamental ASE suppression effect of the SA can be verified.…”

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confidence: 99%

Amplified spontaneous emission suppression of a saturable absorber in a nanosecond double-pass laser amplifier

Jeong

Cho

Hwang

et al. 2019

Jpn. J. Appl. Phys.

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We propose the insertion of a saturable absorber (SA) in a nanosecond double-pass laser amplifier as an amplified spontaneous emission (ASE) suppressor. To analyze the influence of the SA, a theoretical model is developed. One-dimensional simulation results show reasonable agreement with measurements in terms of the output energy and temporal pulse shape. For our amplifier parameters, when an SA of initial transmission 0.5 is inserted, the simulation anticipates the ASE to be reduced by a factor of 0.37 while the output pulse energy is maintained.

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Numerical study of a thermally-compensated high-energy double-pass Nd:YAG amplifier design

Cited by 7 publications

References 9 publications

High-power, Joule-class, temporally shaped multi-pass ring laser amplifier with two Nd:glass laser heads

High-power, Joule-class, temporally shaped multi-pass ring laser amplifier with two Nd:glass laser heads

Compact 15 mJ Fiber–Solid Hybrid Hundred-Picosecond Laser Source for Laser Ablation on Copper

Amplified spontaneous emission suppression of a saturable absorber in a nanosecond double-pass laser amplifier

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