Decreasing effective reflectivity of the output coupler in the power scaling of fiber lasers

被引：8

作者：

Hejaz, K. ^{[1
,2
]}

Shayganmanesh, M. ^{[2
]}

Roohforouz, A. ^{[1
]}

Rezaei-Nasirabad, R. ^{[1
]}

Heidariazar, A. ^{[1
]}

Vatani, V. ^{[1
]}

Nabavi, S. Hassan ^{[1
]}

机构：

[1] Iranian Natl Ctr Laser Sci & Technol, Tehran, Iran

[2] Iran Univ Sci & Technol, Dept Phys, Tehran, Iran

来源：

LASER PHYSICS LETTERS | 2016年 / 13卷 / 03期

关键词：

Yb-doped fiber laser; fiber Bragg grating; high power; spectral width;

D O I：

10.1088/1612-2011/13/3/035107

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Increasing power leads to the spectral broadening of fiber laser beams. In this effect the spectral line width of the laser beam becomes broader than that of the output coupler (OC) due to power scaling. Therefore, the effective reflectivity of the OC mirror decreases. In this paper, this phenomenon is investigated theoretically and experimentally. A Liekki Application Designer V3.3 was used for the theoretical investigation and the experiments were conducted during the fabrication of a 630W fiber laser. Given the excellent agreement between the simulation and the experimental results, a decrease in the effective reflectivity of the OC mirror was proved. The decrease in the effective reflectivity of the OC mirror changes some of the laser parameters, such as optical efficiency, longitudinal distribution of population inversion and the backward power inside the resonator. This may also lead to power instability. The effects of a decrease in the reflectivity of the OC on the mentioned parameters of the fiber laser are investigated in the present paper. Finally, recommendations for choosing appropriate OC mirror parameters in high-power (kW class) fiber lasers are suggested.

引用

页数：4

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