期刊
OPTICS AND LASER TECHNOLOGY
卷 170, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2023.110211
关键词
Semiconductor laser; Narrow linewidth; Linear polarization; Birefringent Bragg grating
This study demonstrates an external-cavity semiconductor laser with linear polarization and a narrow linewidth. A birefringent Bragg grating prepared using a femtosecond laser point-by-point technique in a polarization-maintaining fiber is used to provide external-cavity feedback and enable linewidth narrowing. The compact and robust laser achieved high output power and polarization extinction ratio.
We demonstrate an external-cavity semiconductor laser (ECSL) with linear polarization and a narrow linewidth. A birefringent Bragg grating prepared by a femtosecond laser point-by-point technique in a polarization-maintaining fiber (PMF) is used to provide external-cavity feedback, and its polarization-dependent characteristics enable selection of the main polarization mode and linewidth narrowing of the ridge waveguide emission gain chip (GC). This compact and robust ECSL achieves an output power of > 60 mW and a polarization extinction ratio (PER) of > 30 dB. We simulate and calculate the linewidth and injection current, while a Lorentz linewidth of 2.58 kHz is obtained based on delayed self-heterodyne beat frequency measurement. This flexible and cost-effective solution allows realization of a compact ECSL with linear polarization and a narrow linewidth.
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