| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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All-polarization-maintaining tunable L-band mode-locked fiber laser and cascaded second-harmonic generation |
| Kang-Rui Chang(常康瑞)1,2,, Xiang Zhang(张祥)1,2,3, Cheng-Jie Gao(高承杰)1,2, Hao-Bin Zheng(郑浩斌)1,2, Yong Shen(沈咏)1,2,†, and Hong-Xin Zou(邹宏新)1,2,3,‡ |
1 Institute for Quantum Science and Technology, College of Science, National University of Defense Technology, Changsha 410073, China;
2 Hunan Key Laboratory of Mechanism and Technology of Quantum Information, Changsha 410073, China;
3 National Key Laboratory for Positioning, Navigation and Timing Technology, Changsha 410073, China |
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Abstract There is an urgent demand for highly stable, broadly wavelength-tunable, and low-repetition-rate pulsed lasers in fields such as cold-atom physics, precision spectroscopy, and bioimaging. However, conventional L-band lasers often suffer from environmental instability and limited tuning range. To address this, we propose an all-polarization-maintaining, wavelength-tunable L-band mode-locked fiber laser, followed by cascaded second harmonic generation. Wavelength tuning from 1570 nm to 1596 nm was achieved by incorporating a rotatable intracavity filter with a bandwidth of 10 nm. The laser exhibits self-starting mode locking and can generate pulses with a pulse width of 87 ps and a repetition rate of 15.6 MHz. Using cascaded periodically poled lithium niobate and β-barium borate crystals, we perform frequency conversion on the output pulses to produce tunable near-infrared (778-804 nm) and ultraviolet (389-402 nm) light. With broad wavelength tunability enabling applications such as two-photon excitation fluorescence imaging at 780 nm, laser cooling of calcium ions at 397 nm, and optical pumping in miniaturized rubidium atomic clocks, this laser system can serve as a versatile platform for quantum technologies and ultrafast spectroscopy.
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Received: 20 October 2025
Revised: 23 December 2025
Accepted manuscript online: 26 December 2025
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| Fund: This work was supported by the National Natural Science Foundation of China (Grant Nos. 62105368, 62275268, and 62375284). |
Cite this article:
Kang-Rui Chang(常康瑞), Xiang Zhang(张祥), Cheng-Jie Gao(高承杰), Hao-Bin Zheng(郑浩斌), Yong Shen(沈咏), and Hong-Xin Zou(邹宏新) All-polarization-maintaining tunable L-band mode-locked fiber laser and cascaded second-harmonic generation 2026 Chin. Phys. B 35 084209
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