An Nd: YAG electro-optic Q-switched laser side-pumped by a laser diode and its extra-cavity frequency-doubling characteristics are reported in this paper. The laser employs a KD*P crystal as the electro-optic Q-switch and uses a combination of a 1/4 wave plate and a polarizer to achieve precise Q-switch control. Under the operating conditions of the pump power of 80W, the 1064 nm laser output with a pulse width of 10ns and a single-pulse energy of 3µJ was obtained, with a peak power of 300W. By inserting a 15mm long KTP frequency-doubling crystal outside the cavity, a 532nm single-pulse green of 1.75µJ was achieved with a frequency-doubling conversion efficiency of 58.3%. This experiment achieved high peak power pulsed output from an all-solid-state electro-optic Q-switched laser, with excellent pulse stability and energy fluctuations of less than ±1%. The results demonstrate that the KD*P crystal, as an electro-optic Q-switch, enables precise Q-switching control and generates laser output with narrow pulse width. Furthermore, the frequency-doubling crystal KTP is highly suitable for frequency doubling 1064nm laser radiation, achieving high conversion efficiency at moderate power densities. This study also effectively addressed potential thermal effects during laser operation by implementing a water-cooling system and optimized heat sink design, which successfully controlled the temperature of the Nd: YAG crystal, KD*P electro-optic crystal, and KTP frequency-doubling crystal.
| Published in | Optics (Volume 13, Issue 2) |
| DOI | 10.11648/j.optics.20251302.13 |
| Page(s) | 33-37 |
| Creative Commons |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
| Copyright |
Copyright © The Author(s), 2025. Published by Science Publishing Group |
Side-pumping, Electro-optic Q-switching, Nd: YAG Laser, Extra-cavity Frequency-doubling, KTP Crystal
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APA Style
Shang, L., Cao, Z. (2025). LD-pumped Nd: YAG Electro-optic Q-switched Laser and Its KTP Extra-cavity Frequency-doubling Characteristics. Optics, 13(2), 33-37. https://doi.org/10.11648/j.optics.20251302.13
ACS Style
Shang, L.; Cao, Z. LD-pumped Nd: YAG Electro-optic Q-switched Laser and Its KTP Extra-cavity Frequency-doubling Characteristics. Optics. 2025, 13(2), 33-37. doi: 10.11648/j.optics.20251302.13
AMA Style
Shang L, Cao Z. LD-pumped Nd: YAG Electro-optic Q-switched Laser and Its KTP Extra-cavity Frequency-doubling Characteristics. Optics. 2025;13(2):33-37. doi: 10.11648/j.optics.20251302.13
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Download@article{10.11648/j.optics.20251302.13,
author = {Lianju Shang and Zhenzhong Cao},
title = {LD-pumped Nd: YAG Electro-optic Q-switched Laser and Its KTP Extra-cavity Frequency-doubling Characteristics},
journal = {Optics},
volume = {13},
number = {2},
pages = {33-37},
doi = {10.11648/j.optics.20251302.13},
url = {https://doi.org/10.11648/j.optics.20251302.13},
eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.optics.20251302.13},
abstract = {An Nd: YAG electro-optic Q-switched laser side-pumped by a laser diode and its extra-cavity frequency-doubling characteristics are reported in this paper. The laser employs a KD*P crystal as the electro-optic Q-switch and uses a combination of a 1/4 wave plate and a polarizer to achieve precise Q-switch control. Under the operating conditions of the pump power of 80W, the 1064 nm laser output with a pulse width of 10ns and a single-pulse energy of 3µJ was obtained, with a peak power of 300W. By inserting a 15mm long KTP frequency-doubling crystal outside the cavity, a 532nm single-pulse green of 1.75µJ was achieved with a frequency-doubling conversion efficiency of 58.3%. This experiment achieved high peak power pulsed output from an all-solid-state electro-optic Q-switched laser, with excellent pulse stability and energy fluctuations of less than ±1%. The results demonstrate that the KD*P crystal, as an electro-optic Q-switch, enables precise Q-switching control and generates laser output with narrow pulse width. Furthermore, the frequency-doubling crystal KTP is highly suitable for frequency doubling 1064nm laser radiation, achieving high conversion efficiency at moderate power densities. This study also effectively addressed potential thermal effects during laser operation by implementing a water-cooling system and optimized heat sink design, which successfully controlled the temperature of the Nd: YAG crystal, KD*P electro-optic crystal, and KTP frequency-doubling crystal.},
year = {2025}
}
TY - JOUR T1 - LD-pumped Nd: YAG Electro-optic Q-switched Laser and Its KTP Extra-cavity Frequency-doubling Characteristics AU - Lianju Shang AU - Zhenzhong Cao Y1 - 2025/12/08 PY - 2025 N1 - https://doi.org/10.11648/j.optics.20251302.13 DO - 10.11648/j.optics.20251302.13 T2 - Optics JF - Optics JO - Optics SP - 33 EP - 37 PB - Science Publishing Group SN - 2328-7810 UR - https://doi.org/10.11648/j.optics.20251302.13 AB - An Nd: YAG electro-optic Q-switched laser side-pumped by a laser diode and its extra-cavity frequency-doubling characteristics are reported in this paper. The laser employs a KD*P crystal as the electro-optic Q-switch and uses a combination of a 1/4 wave plate and a polarizer to achieve precise Q-switch control. Under the operating conditions of the pump power of 80W, the 1064 nm laser output with a pulse width of 10ns and a single-pulse energy of 3µJ was obtained, with a peak power of 300W. By inserting a 15mm long KTP frequency-doubling crystal outside the cavity, a 532nm single-pulse green of 1.75µJ was achieved with a frequency-doubling conversion efficiency of 58.3%. This experiment achieved high peak power pulsed output from an all-solid-state electro-optic Q-switched laser, with excellent pulse stability and energy fluctuations of less than ±1%. The results demonstrate that the KD*P crystal, as an electro-optic Q-switch, enables precise Q-switching control and generates laser output with narrow pulse width. Furthermore, the frequency-doubling crystal KTP is highly suitable for frequency doubling 1064nm laser radiation, achieving high conversion efficiency at moderate power densities. This study also effectively addressed potential thermal effects during laser operation by implementing a water-cooling system and optimized heat sink design, which successfully controlled the temperature of the Nd: YAG crystal, KD*P electro-optic crystal, and KTP frequency-doubling crystal. VL - 13 IS - 2 ER -
School of Physics and Physical Engineering, Qufu Normal University, Qufu, China
School of Cyber Science and Engineering, Qufu Normal University, Qufu, China
