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Development of a Contact Cooling Type Nd:YAG Laser Pumping Module
New Phys.: Sae Mulli
Published online January 28, 2019;
© 2019 New Physics: Sae Mulli.

Dohwan Kwon, Gyu Ug Kim*
Received December 11, 2018; Revised January 24, 2019; Accepted January 25, 2019.
We have fabricated a contact cooling type pumping module, and constructed a Nd:YAG laser pumped by three laser diode bars in series. The 1064 nm output power of the linearly polarized single mode was 17.7 W for the 80% reflectance of output mirror, when a Nd:YAG laser rod with a diameter of 1.6 mm and a length of 63 mm and having Brewster's angle at both ends was transversely pumped with the 91 W laser diodes. 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 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 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, it was found that the laser diode absorbed into the Nd:YAG laser rod was uniformly distributed.

January 2020, 70 (1)
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