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High power tunable Raman fiber laser at 1.2μm waveband

Frontiers of Optoelectronics 2024年第1期17卷 1-8页

作者： Yang Zhang Jiangming Xu Junrui Liang Jun Ye Sicheng Li Xiaoya Ma Zhiyong Pan Jinyong Leng Pu Zhou College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Nanhu Laser Laboratory National University of Defense TechnologyChangsha 410073China Hunan Provincial Key Laboratory of High Energy Laser Technology National University of Defense TechnologyChangsha 410073China

Development of a high power fiber laser at special waveband,which is difficult to achieve by conventional rare-earth-doped fibers,is a significant challenge.One of the most common methods for achieving lasing at special wavelength is Raman conversion.Phosphorus-doped fiber(PDF),due to the phosphorus-related large frequency shift Raman peak at 40 THz,is a great choice for large frequency shift Raman conversion.Here,by adopting 150 m large mode area triple-clad PDF as Raman gain medium,and a novel wavelength-selective feedback mechanism to suppress the silica-related Raman emission,we build a high power cladding-pumped Raman fiber laser at 1.2μm waveband.A Raman signal with power up to 735.8 W at 1252.7 nm is obtained.To the best of our knowledge,this is the highest output power ever reported for fiber lasers at 1.2μm waveband.Moreover,by tuning the wavelength of the pump source,a tunable Raman output of more than 450 W over a wavelength range of 1240.6–1252.7 nm is demonstrated.This work proves PDF’s advantage in high power large frequency shift Raman conversion with a cladding pump scheme,thus providing a good solution for a high power laser source at special waveband.

关键词： Phosphosilicate fiber Raman fiber laser 1.2μm waveband wavelength tunable

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Low fabrication cost wavelength tunable WG-FP hybrid-cavity laser working over 1.7μm

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Journal of Semiconductors 2022年第6期43卷 29-33页

作者： Fangyuan Meng Hongyan Yu Xuliang Zhou Mengqi Wang Yejin Zhang Wenyu Yang Jiaoqing Pan Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices Beijing 100083China

A wide wavelength tuning range and single-mode hybrid cavity laser consists of a square Whispering-Gallery(WG)microcavity and a Fabry–Pérot(FP)was introduced and demonstrated.A wavelength tuning range over 12.5 nm from 1760.87 to 1773.39 nm which was single-mode emitting was obtained with the side-mode suppression ratio over 30 dB.The hybrid cavity laser does not need grating etching and special epitaxial structure,which reduces the fabrication difficulty and cost,and shows the potential for gas sensing with absorption lines in this range.

关键词： wavelength tunable hybrid cavity laser Whispering-Gallery microcavity gas sensing

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Experimental Study on One-mirror-inclined Three-mirror-cavity Photodetectors

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Chinese Journal of Lasers 2002年第6期11卷 41-45页

作者：黄辉张瑞康王琦黄永清任晓敏 Beijing University of Posts and Telecommunications Beijing University of Posts and Telecommunications Beijing 100876 China

Research on the one mirror inclined three mirror cavity (OMITMiC) photodetectors in the laboratory is reported. In the structure of photodetectors, it is the inclined mirror that makes the filtering cavity and the absorption cavity decoupled, thus narrow spectral response linewidth, wavelength tunable and high quantum efficiency can be achieved simultaneously. On the basis of the theoretical analysis and experimental verification on the principle with separated optical components, the vertical taper structure, the key part in the whole integrated device was realized, by dynamic etch mask technique. Moreover, the first integrated device of this type was fabricated. A spectral linewidth less than 6 nm and a quantum efficiency of 52.6% have been achieved experimentally.

关键词： photodetectors wavelength tunable linewidth taper structure

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