不同泵浦波长光纤激光器模式不稳定效应对比

Yingchao, 万颖超 Wan; Baolai, 杨保来 Yang; Xiaoming, 奚小明 Xi; Hanwei, 张汉伟 Zhang; Yun, 叶云 Ye; Xiaolin, 王小林 Wang

doi:10.3788/irla20210256

Cited by 3 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From the perspective of thermal effects within the fiber, it is believed that TMI can be suppressed by reducing the thermal load or decreasing the thermal gradient within the fiber to avoid the generation of the thermallyinduced refractivity gratings [6]. Such methods include optimizing the signal wavelength, pump wavelength, pump configuration, and fiber materials [10][11][12][13][14][15]. On the other hand, as TMI is highly associated with modes, it is generally believed that the higher proportion of higher order modes (HOM) in the fiber, the lower the TMI threshold.…”

Section: Introductionmentioning

confidence: 99%

Demonstration of a bidirectional oscillating-amplifying integrated fiber laser with two ports times 2.5kW

Liu,

Zeng,

wang

et al. 2023

Eighteenth National Conference on Laser Technology and Optoelectronics

View full text Add to dashboard Cite

Bidirectional Oscillating-Amplifying Integrated Fiber Lasers (B-OAIFL) combine the advantages of Oscillating-Amplifying Integrated Fiber Lasers (OAIFL) and bidirectional output fiber lasers, including high efficiency, simple control logic, good anti-back reflection, low cost, and small volume. In this work, we introduced the (2+1)×1 Side Pump Signal Combiner (SPSC) between the Output Coupler Fiber Bragg Grating (OC-FBG) and the amplifying sections to address the temporal instability of the laser at low power levels under the counter pumping. Two groups of wavelength-stabilized 976 nm Laser Diodes (LDs) were directly coupled into the oscillating section to increase the laser power within the cavity, and then, a 60 W-level time-stabilized threshold signed as photodetector-detected no-pulse characteristics was achieved. We compared the output characteristics with two different fiber-coiling structures in the oscillating section (STR1, STR2). STR1 was coiled in a single-track-shaped fiber groove with a diameter ranging from 8.0 cm to 10.7 cm, while the coiling diameters of the two output ports were different. For STR2, an '8'-shaped coiling was adopted with gradually varying diameters from 8.0 cm to 9.5 cm and the same coiling diameter of 8.0 cm at both ports. The Transverse Mode Instability (TMI) threshold under the unidirectional pumping at end A and end B were 2271 W and 2530 W, respectively, with Structure one. With Structure two, the thresholds at end A and end B were 2735 W and 2508 W, respectively. Based on STR2 under the bidirectional pumping with a total pump power of 6997 W, we finally achieved a laser output of 2655 W at the end A and 2491 W at the end B, with a total power of 5146 W and a good beam quality of M2 to approximately 1.32 at end A and M2 to approximately 1.45 at end B, respectively. The Stimulated Raman Scattering (SRS) suppression ratio exceeded 40 dB for both end A and end B.

show abstract