Maintaining the Polarization, Temperature and Amplification Characteristics of a Ytterbium-doped Rod-type Photonic Crystal Fiber (PCF) Amplifier

被引：5

作者：

Kim, Yong-Gi ^{[1
]}

Ryu, Ji Wook ^{[1
]}

Cha, Yong-Ho ^{[2
]}

Park, Hyunmin ^{[2
]}

Lim, Gwon ^{[2
]}

Han, Jaemin ^{[2
]}

Ko, Kwang-Hoon ^{[2
]}

Kim, Taek-Soo ^{[2
]}

Jeong, Do-Young ^{[2
]}

机构：

[1] Kongju Natl Univ, Dept Phys, Kong Ju 314701, South Korea

[2] Korea Atom Energy Res Inst, Labs Quantum Opt, Taejon 305600, South Korea

来源：

JOURNAL OF THE KOREAN PHYSICAL SOCIETY | 2011年 / 59卷 / 05期

关键词：

Fiber laser; PCF; PCF amplifier; Degree of polarization; STIMULATED BRILLOUIN-SCATTERING; LARGE-MODE-AREA; SBS-THRESHOLD; SUPPRESSION; LASER;

D O I：

10.3938/jkps.59.3182

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on a single-frequency ytterbium (Yb)-doped end-capped 81-cm rod-type photonic crystal fiber (PCF) amplifier. At a pump power of 250 W and seed power input of 4 W, the CW PCF amplifier was found to generate average output powers of 138 W, 110 W, and 82 W at 1056-nm, 1070-nm, and 1089-nm wavelengths, respectively. The amplified PCF output beam had a linewidth of 70 MHz full width at half maximum (FWHM). These PCF amplified beams had good beam qualities with M(2) values of less than 1.8 at all three wavelengths. The gain saturation seed input power in the 81-cm PCF was found to be similar to 6 W at 1056 nm. The temperature of the PCF core reached over 230 degrees C at the pumping section of the PCF. The temperatures of the end-cap heads on both the pumping and the output end-cap sides were 81.4 degrees C and 35.7 degrees C, respectively. The PCF amplifier maintained good polarization mode characteristics with an average degree of polarization of over 87%. The slight decrease in degree of polarization (DOP) at output power over 170 W may have been caused by a variation in the air hole diameter and an asymmetry in the PCF structure.

引用

页码：3182 / 3187

页数：6

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