南京大学 现代工程与应用科学学院, 江苏 南京 210000
为了改善内腔连续光参量振荡器(IC-OPO)输出功率不稳定, 弛豫振荡严重等问题, 对IC-OPO进行了改进: (1) 采用热透镜补偿设计, 改善模式匹配; (2) 使用光阑限模, 抑制高阶模振荡; (3) 在腔内加入KTP晶体, 利用二次谐波产生(SHG)过程的非线性损耗抑制弛豫振荡。通过改进, 获得了稳定的紧凑型2.2～4.2 μm的可调谐连续波中红外光源。输出功率波动标准偏差(RMS) 0.52%, 峰值波动范围1.8%, 光束质量因子M2=1.72, 弛豫振荡得到有效抑制。当腔内不加入KTP晶体时, 阈值(808 nm)仅为1.5 W。据笔者所知, 该阈值为国内相关工作报道中的最低值。
光参量振荡器 内腔 连续波 弛豫振荡抑制 OPO intra-cavity continuous-wave relaxation-oscillation suppression 红外与激光工程
2017, 46(4): 0406004
Author Affiliations
Abstract
1 National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
2 College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China
We demonstrate an efficiency-enhanced picosecond (ps) mid-infrared radiation via optical parametric downconversion. Based on a cascaded periodically poled MgO-doped stoichiometric lithium tantalate crystal (MgO:sPPLT), a tandem optical parametric oscillation-optical parametric amplification (OPO-OPA) process is achieved. Compared with a single OPO process, the conversion efficiency obtains an enhancement of 71%.
140.0140 Lasers and laser optics 190.0190 Nonlinear optics Chinese Optics Letters
2016, 14(4): 041402
Author Affiliations
Abstract
National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China
We demonstrate a tunable optical parametric oscillator in a periodically poled congruently grown lithium tantalite whispering gallery mode resonator. The resonator is mechanically polished to millimeter size, and the quality factor is approximately 107 at 1064 nm. Our experiments show that this kind of resonator is capable of reaching a very low threshold and having a wide tuning range. Combined with its narrow resonant linewidth, it is potentially used as a compact, widely tunable, and narrow-linewidth infrared to mid-infrared laser source.
140.0140 Lasers and laser optics 190.0190 Nonlinear optics Chinese Optics Letters
2016, 14(9): 091902
