上海大学特种光纤与光接入网重点实验室，上海 200444
针对调制光栅Y分支型（MG-Y）激光器在实际应用中波长-电流查找表（LUT）构建效率低、调谐方式复杂、波长调谐时功率漂移量大等问题，对其调谐特性进行了深入研究。利用左、右反射器电流的调谐特性，设计出一种具有普适性的波长测试框架，能够高效且准确地定位激光器的平滑波长调谐路径。同时提出一种自适应功率校准算法，提升了激光器在波长调谐时的功率稳定性。测试结果表明：基于波长测试框架的LUT仅包含3147个反射器电流-波长组合；激光器的波长调谐范围为1528~1568 nm，波长调谐步长为5 pm；边模抑制比（SMSR）大于40 dB；波长准确度优于±2.9 pm；波长重复性优于1.9 pm；波长调谐时功率漂移量小于0.408 mW，稳定度为3.57%；解调出光纤非本征法布里-珀罗干涉型（EFPI）传感器的腔长变化量小于7.58 nm，可以应用于光纤传感等实际场景。
激光器 半导体激光器 波长调谐 功率校准 光纤传感
1 中国科学技术大学 核探测与核电子学国家重点实验室,合肥 230026
2 中国科学技术大学 物理学院 光学与光学工程系,合肥230026
3 先进激光技术安徽省实验室,合肥 230026
为了在光纤激光器中获得具有中心波长可调谐的锁模脉冲柱矢量,采用半导体可饱和吸收镜和高反的啁啾光纤光栅作为腔镜,搭建了直腔掺镱脉冲光纤激光器,腔内插入长周期光纤光栅作为模式转化器件,进行了实验验证,取得了波长可调谐的柱矢量脉冲数据。结果表明,激光器工作在1060.72 nm时,光谱带宽0.22 nm,输出斜率效率为8.6%,锁模脉冲宽度为10.9 ps,重频 18.66 MHz,锁模脉冲信噪比高达65 dB,同时获得了模式纯度超过97%的柱矢量光束; 调节腔内的偏振控制器来改变腔内波长的损耗,可以实现锁模柱矢量脉冲的谐振波长在1060.72 nm~1066.04 nm连续可调。该研究为可调谐脉冲柱矢量光纤激光器研制提供了重要的参考价值。
激光器 波长可调谐 锁模 柱矢量光束 掺镱光纤激光器 lasers wavelength tuning mode-locked cylindrical vector beam ytterbium doped fiber laser
Author Affiliations
Abstract
1 Fujian Key Laboratory of Ultrafast Laser Technology and Applications, School of Electronic Science and Engineering, Xiamen University, Xiamen 361005, China
2 Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen 361005, China
3 Prokhorov General Physics Institute, Dianov Fiber Optics Research Center, Russian Academy of Sciences, Moscow 119333, Russia
4 Devyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences, Nizhny Novgorod 603951, Russia
We have successfully generated a 1.3/1.4 µm random fiber laser (RFL) using bismuth (Bi)-doped phosphosilicate fiber. The Bi-doped RFL has shown excellent long-term operational stability with a standard deviation of approximately 0.34% over 1 h at a maximum output power of 549.30 mW, with a slope efficiency of approximately 29.21%. The Bi-doped phosphosilicate fiber offers an emission spectrum ranging from 1.28 to 1.57 µm, indicating that it can be tuned within this band. Here, we demonstrated a wavelength-tuning fiber laser with a wavelength of 1.3/1.4 µm, achieved through the using of a fiber Bragg grating or a tunable filter. Compared to traditional laser sources, the RFL reduces the speckle contrast of images by 11.16%. Due to its high stability, compact size, and high efficiency, this RFL is highly promising for use in biomedical imaging, communication, and sensor applications.
random fiber laser bismuth-doped fiber wavelength tuning fiber laser Chinese Optics Letters
2023, 21(7): 071401
Author Affiliations
Abstract
State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon Technology, School of Physics, Northwest University, Xi’an 710069, China
We report a Yb-doped mode-locked fiber laser based on a nonlinear amplifying loop mirror (NALM), which is all-normal-dispersion (ANDi), and allows the output wavelength to be tunable. The laser can generate a stable femtosecond dissipative soliton with a maximum output power of 196 mW. Its repetition rate is 112.4 MHz, and the final pulse duration is 236 fs. By adjusting the angle of the reflective diffraction grating, the mode-locked fiber laser was realized to tune the output with a tuning range of 54 nm from 1011.8 nm to 1065.6 nm. To the best of our knowledge, this is the widest tuning range of an ANDi Yb-doped mode-locked fiber laser based on NALM.
all-normal-dispersion wavelength tuning mode-locked fiber laser Chinese Optics Letters
2023, 21(6): 061402
1 海南师范大学物理与电子工程学院海南省激光技术与光电功能材料重点实验室，海南 海口 571158
2 中国科学院长春光学精密机械与物理研究所发光学及应用国家重点实验室，吉林 长春 130033
3~5 μm中红外波段激光在气体分子传感、空间光通信、差频太赫兹产生等领域中有广阔的应用前景。研究了一种4 μm波段宽谱可调谐外腔量子级联激光器，设计了一种以Littrow结构为基础的紧凑便携可调谐激光器模块。在激光器模块中采用同一个量子级联增益芯片，分别使用刻线密度为450 line/mm和300 line/mm的闪耀光栅组建了不同的外腔。当采用刻线密度为450 line/mm的闪耀光栅时，注入电流303 mA下的输出光功率为7.30 mW，具有380 nm的调谐范围（3774~4154 nm），边模抑制比为20 dB，出现高阶模式激射现象；当采用刻线密度为300 line/mm的闪耀光栅时，303 mA注入电流下的输出功率为5.24 mW，调谐范围为297 nm（3779~4076 nm），边模抑制比为20 dB，出现基模激射现象。由此可见，采用不同的外腔配置，可以分别获得满足高精度波长调谐和高光束质量要求的激光器性能。
激光器 量子级联激光器 闪耀光栅 波长调谐 Littrow结构 中国激光
2023, 50(11): 1101020
1 光电信息控制和安全技术重点实验室, 天津
2 中国人民解放军93046部队, 沈阳
作为光纤非线性效应中的一种, 孤子自频移效应由于其特殊的脉冲自持性而成为光纤中超短脉冲波长调谐的有效方式。从理论计算和实验验证角度对光纤中的孤子自频移效应进行研究, 基于广义非线性薛定谔方程对光纤中的孤子自频移效应进行仿真计算, 通过测量超短脉冲在保偏光子晶体光纤输出端的光谱对其进行实验分析, 理论和实验结果相符合, 均表明基于孤子自频移效应的超短脉冲波长可以实现大于300 nm的光纤反常色散区连续调谐。
孤子自频移 超短脉冲 波长调谐 光子晶体光纤 soliton self-frequency shift effect ultrashort pulse wavelength tuning photonic crystal fiber
Author Affiliations
Abstract
1 State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3 Changchun University of Science and Technology, Changchun 130021, China
4 TRUMPF GmbH + Co. KG, Ditzingen 71254, Germany
We report a wavelength-tunable multi-point pump scheme of the semiconductor disk lasers (SDLs). By designing an external cavity of SDL with an intra-cavity transmission grating, multiple pump gain regions share the same resonator. The effect of the intra-cavity grating on the output laser power, wavelength, and beam quality was investigated. The emission wavelength could be tuned over a bandwidth of . With multi-point pumping, we achieve the laser output power with almost no loss, and further improvement is limited by the thermal effect. The changes in the beam are due to the mode selectivity by the intra-cavity grating.
semiconductor disk laser wavelength tuning transmission grating multi-point pump Chinese Optics Letters
2023, 21(2): 021401
1 南京理工大学电子工程与光电技术学院，江苏 南京 210094
2 中科院南京天文仪器有限公司，江苏 南京 210042
为抑制Φ600 mm波长调谐干涉仪测量过程中振动引起的测量误差，研究了波长调谐振动抑制算法。该算法构建了基于波长调谐移相的振动理论模型，在此基础上建立光强与初始相位的关系曲线，从它的频谱中提取谐波系数用于修正初始相位，解算出真实相位。引入评价参数误差抑制系数，将该算法应用于Φ600 mm波长调谐平面移相干涉仪，经过振动抑制算法的处理，振动引起的二倍频“纹波”误差得到较好的抑制，波面峰谷值由0.1180λ降至0.0951λ（λ为波长），均方根值由0.0164λ降到0.0135λ，结果验证了振动抑制算法在波长调谐移相干涉仪上的有效性。
测量 移相干涉 波长调谐 大口径干涉仪 振动抑制 光学学报
2022, 42(23): 2312005
