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12 December 2018 Single-frequency fiber laser operating above 2 μm based on cascaded single-mode-multimode-single-mode fiber structures and Sagnac loop
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Proceedings Volume 10844, Advanced Laser Technology and Applications; 1084416 (2018) https://doi.org/10.1117/12.2505673
Event: International Symposium on Optoelectronic Technology and Application 2018, 2018, Beijing, China
Abstract
In this paper a single frequency thulium doped silica fiber(TDF) laser operating above 2 μm based on cascaded single-mode-multimode-single-mode(SMS) structures incorporating a Sagnac loop was experimentally demonstrated. Based on the theoretical analysis of the transmission properties of the SMS fiber structure and mode selection characteristic of Sagnac loop, two cascaded SMS fiber devices with same multimode fiber lengths around 3.24 cm were used in our laser system to select the specific lasing wavelength above 2 μm as well as enhancing the suppression of lasing around 1900 nm. And 6.5 m unpumped TDF were employed in Sagnac loop as saturable absorber to achieve single frequency operation. Single-longitudinal-mode operation of the fiber laser at 2004.05 nm has been achieved with a signal to noise ratio (SNR) more than 60dB.
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Chaodu Shi, Shijie Fu, Guannan Shi, Wei Shi, Quan Sheng, and Jianquan Yao "Single-frequency fiber laser operating above 2 μm based on cascaded single-mode-multimode-single-mode fiber structures and Sagnac loop", Proc. SPIE 10844, Advanced Laser Technology and Applications, 1084416 (12 December 2018); https://doi.org/10.1117/12.2505673
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