search for
Development of a Contact-Cooling-Type Nd:YAG Laser Pumping Module
New Phys.: Sae Mulli 2019; 69: 302~308
Published online March 29, 2019;
© 2019 New Physics: Sae Mulli.

Dohwan KWON1, Gyu Ug KIM*2

1Department of Physics, Kumoh National Institute of Technology, Gumi 39253, Korea
2Department of Optical Engineering, Kumoh National Institute of Technology, Gumi 39253, Korea

Correspondence to:
Received December 11, 2018; Revised January 24, 2019; Accepted January 25, 2019.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
We have fabricated a contact-cooling-type pumping module and constructed a Nd:YAG laser pumped by using three laser-diode bars in series. When a Nd:YAG laser rod with a diameter of 1.6 mm and a length of 63 mm, for which the Brewster's angle at both ends was transversely pumped using 91 W laser diodes, the 1064 nm output power of the linearly polarized single mode was 17.7 W for an output mirror with 80\% reflectance. The slope efficiency was measured to be 24.7\%, 20.4\%, and 17.8\% for output coupler reflectivities of 80\%, 90\%, and 95\%, respectively. From this experimental result, the internal loss $L$ of the laser oscillator was calculated to be 0.23. The small-signal gain coefficient and the single-pass gain were estimated to be $g_0$ = 33.7 $\times$ 10$^{-3}$/cm and $G_0$ = 1.24, respectively, when the reflectivity of the output coupler was 80\%. The far-field intensity distribution of the 1064 nm Nd:YAG laser was Gaussian, and the beam quality factor was measured to be $M_x^2$ = 1.17, $M_y^2$ = 1.20. From the measurement of the fluorescence distribution of 1064 nm, the radiation from laser diode that was absorbed into the Nd:YAG laser rod was found to be uniformly distributed.
PACS numbers: 42.55.Xi, 42.60.By, 42.60.Da
Keywords: diode-pumped laser, transverse pumping, contact cooling

March 2019, 69 (3)
  • Scopus
  • CrossMark