研究目的
Investigating the transverse mode competition and instabilities in high-power fiber laser oscillators under continuous wave and pulsed pumping conditions.
研究成果
The study demonstrates that transverse mode competition in high-power fiber laser oscillators is due to combined and interleaved inversion- and thermally-related effects, with distinctively different characteristic frequencies and power dependencies. The findings highlight the complex dynamics leading to full chaotic operation at higher pump powers.
研究不足
The study is limited to the specific configuration of the fiber laser oscillator used and may not be directly applicable to other configurations. The transient effects and TMI build-up are to some extent overlooked due to the focus on steady-state pumping conditions.
1：Experimental Design and Method Selection:
The study involved monitoring the dynamic power exchanges and characteristic frequencies of the transmitted fundamental mode and scattered high-order modes of the fiber laser cavity under CW and pulsed pumping.
2：Sample Selection and Data Sources:
The active fiber used was a multimode Yb3+-doped SPI Lasers GTWave with a core radius of ~8μm and V number of ~
3：List of Experimental Equipment and Materials:
The setup included semiconductor laser pumps, photodiodes (PD#1 and PD#2), a thermal head, and an oscilloscope for data acquisition.
4：Experimental Procedures and Operational Workflow:
The system was pumped by combined 950nm diodes from both sides of the GTWave in CW or with square pump pulses. The output power and CMS readings were recorded at various power levels.
5：Data Analysis Methods:
The data was analyzed to identify the characteristic frequencies and power dependencies of the observed instabilities.
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