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Study on a Laser-Diode (LD)-Pumped, Neodymium (Nd)-Doped KGd(WO$_4$)$_2$ (Nd:KGW) Laser and a Ytterbium (Yb)-Doped Fiber Amplifier
New Phys.: Sae Mulli 2019; 69: 295~301
Published online March 29, 2019;
© 2019 New Physics: Sae Mulli.

Chihyun JUNG1, Jonghoon YI*1, Dohyung KIM2, Jiyoung BAE2, Jiwoong JANG2, Yeongchan HAN2, Kyungyung KIM2

1Department of Physics, Yeungnam University. Gyeongsan 38541, Korea
2Daegu Science High School, Daegu 42110, Korea

Correspondence to:
Received December 9, 2018; Revised January 30, 2019; Accepted January 30, 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.
A laser diode(LD) with a center wavelength of 804.7 nm was used to pump a neodymium (Nd)-doped KGd(WO$_4$)$_2$ crystal. The output power of the Nd:KGW laser was measured as a function of the pump power of the LD while varying the reflectivity of the output mirror from 88\% to 97\%. The lasing threshold, slope efficiency, and round-trip loss of the resonator were measured from the experimental results. The resonator round-trip loss was obtained using the Findlay \& Clay method. In addition, the polarization, spectral and line width characteristics of the laser were analyzed. The output beam from the LD-pumped Nd:KGW laser was focused to a ytterbium (Yb)-doped large mode area fiber with a core diameter of 25 $\mu$m. A LD with a center wavelength of 915 nm was used to pumped the fiber in the counter propagating direction. The amplified Nd:KGW laser showed enhanced beam quality, and the maximum gain was about 10 compared to a Nd:YAG oscillator and amplifier, the developed Nd:KGW laser and fiber amplifier system is expected to show on output power that is more stable against temperature variation and a beam quality that is more enhanced.
PACS numbers: 42.55.Xi, 42.55.Wd, 42.60.Da
Keywords: Nd:KGW laser, fiber amplifier, beam quality

March 2019, 69 (3)
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