光学学报, 2014, 34(8): 0814004, 网络出版: 2014-08-01

单程高增益1.9 μm光纤气体拉曼激光器

Single-Pass High-Gain 1.9 μm Optical Fiber Gas Raman Laser
作者单位

1国防科学技术大学光电科学与工程学院, 湖南 长沙 410073

2巴斯大学物理系, 英国 巴斯 BA2 7AY

摘要
报道了基于空心光子晶体光纤中氢气分子振动受激拉曼散射(SRS)的单程高增益1.9 μm光纤气体激光器。用一个线偏振1064 nm 亚纳秒脉冲微芯激光器抽运一段长6.5 m、充高压氢气的低损耗负曲率空心光纤,实现了到氢气分子一级振动斯托克斯波1907 nm的有效转换。气压为2.3 MPa时最大能量转换效率大于27%,相应的量子转换效率大于48%,激光平均功率约为10 mW,峰值功率大于2000 W。为实现高功率、窄线宽、大范围调谐的紧凑型中红外光纤激光器提供了一条潜在的有效途径。
Abstract
A single-pass high-gain 1.9 μm fiber gas laser, based on vibrational stimulated Raman scattering in a hydrogen-filled hollow core photonic crystal fiber, is reported. Efficient conversion to the first-order vibrational Stokes wave of 1907 nm is obtained in a low loss negative curvature hollow core fiber with a length of 6.5 m, which is filled with high pressure hydrogen pumped with a linearly polarized 1064 nm microchip pulse laser. The maximum power conversion efficiency, which is more than 27% at 2.3 MPa hydrogen pressure, and a quantum conversion efficiency of 48% are achieved. The maximum laser average power is about 10 mW,and the maximum peak power is more than 2000 W. It provides a potentially effective method to obtain broadly tunable mid-IR fiber lasers of high power and narrow linewidth.
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