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Design and fabrication of a Nd:YAG unstable multi-pass telescopic amplifier
•Design and fabrication of a compact unstable positive branch multi-pass telescopic amplifier.•Assembly and operation of a homemade Q-Switched Nd:YAG oscillator coupled with multi-pass telescopic amplifier.•Output beam diagnosis.•Beam tuning study by investigating beam divergence control with mirror...
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Published in: | Optics and laser technology 2024-01, Vol.168, p.109851, Article 109851 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites |
Online Access: | Get full text |
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Summary: | •Design and fabrication of a compact unstable positive branch multi-pass telescopic amplifier.•Assembly and operation of a homemade Q-Switched Nd:YAG oscillator coupled with multi-pass telescopic amplifier.•Output beam diagnosis.•Beam tuning study by investigating beam divergence control with mirror pair-separation in multi-pass telescopic amplifier.
Here, an unstable positive branch multi-pass telescopic amplifier has been designed and fabricated. At first, a stable Q-switched Nd: YAG oscillator has been implemented operating in near fundamental mode. A well-designed pair of mirrors is elaborated for the multi-pass telescopic amplifier to extract the maximum energy from the gain medium within a compact volume. This configuration exhibits a small angular beam divergence (typically 0.06 mrad). Furthermore, the tuning of beam diameter at far field is investigated in terms of mirrors separation. Hence, it is feasible to tune the beam diameter during remote sensing not only to reduce the divergence but also to focus the beam at the target under certain conditions. The experimental arrangement gives out a near field donut-shaped profile with 1 J pulse energy, 10 ns, 1 Hz at 1064 nm. Systematic measurements are carried out to obtain the small-signal gain and saturation properties in terms of various pump energies and the correlation of those parameters are elucidated with the beam profile in near field configuration. The output beam profile is empirically recorded at different distances as far as 50 m to verify the theoretical model given by the physical optical propagation algorithm of the Zemax software. The latter simulates the laser beam intensity distribution in the far field. The measurements taken by the beam profiler are in good agreement with those given by Zemax simulation. |
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ISSN: | 0030-3992 1879-2545 |
DOI: | 10.1016/j.optlastec.2023.109851 |