报道了一种基于空芯光子晶体光纤中氘气转动受激拉曼散射的单程高效光纤气体激光光源。因空芯光子晶体光纤具有特殊的传输谱,增益相对较大的振动受激拉曼散射被很好地抑制,使得泵浦激光能够高效地向转动斯托克斯光转化。采用自行搭建的1540 nm纳秒脉冲光纤放大器,泵浦一段长为20 m、充高压氘气的空芯光子晶体光纤,在单程结构中实现了高效的1645 nm拉曼激光输出。当气压为2 MPa时,最大平均输出功率约为0.8 W(单脉冲能量约为1.6 μJ),激光光源斜率效率约为71.4%。研究结果为1.7 μm波段光纤激光的实现提供了一条简单有效的新途径。

In this study, a high-efficiency fiber gas laser source is developed in a single-pass deuterium-filled hollow-core photonic crystal fiber by rotational stimulated Raman scattering (SRS). The ordinary dominant vibrational SRS with relatively large gain is suppressed because of the special transmission properties of this low-loss hollow-core photonic crystal fiber, permitting its efficient conversion to a rotational Stokes wave. A homemade 1540-nm nanosecond pulsed fiber amplifier is used to pump a hollow-core photonic crystal fiber having a length of 20 m with a high-pressure deuterium gas. Thus, a high-efficiency 1645-nm Raman laser is obtained using a single-pass configuration. A maximum average output power of ~0.8 W (single-pulse energy of ~1.6 μJ) can be obtained with respect to the 1645-nm Raman laser at a pressure of 2 MPa, and the slope efficiency is observed to be ~71.4%. This study introduces a simple and effective way for the realization of 1.7-μm-band fiber lasers.