研究目的
Demonstrating a high power 1030 nm passively mode-locked ytterbium-doped picosecond fiber laser by master oscillator power amplifier (MOPA) configuration.
研究成果
A high power 1030 nm picosecond Yb-doped all-fiber laser based on MOPA system was demonstrated. The output power was boosted to 101 W in a 30/250 μm double-clad ytterbium doped fiber with the slope efficiency of 76.7%. The power scaling can be further improved by the use of amplification in Yb:YAG crystal.
研究不足
The peak power of over 4 MW will lead to the self-focusing effect and do damage to the gain medium. The high mode operation will have relatively little influence to the next stage of Yb: YAG amplifier.
1：Experimental Design and Method Selection:
The laser system consists of a picosecond seed and three stages of ytterbium-doped all-fiber amplifiers. The seed is mode-locked by a semiconductor saturable absorber mirror (SESAM).
2：Sample Selection and Data Sources:
The gain medium is a piece of Yb-doped fiber with the length of 1.0 m. The seed laser is mode-locked by a SESAM, which also acts as the total reflection cavity mirror.
3：0 m. The seed laser is mode-locked by a SESAM, which also acts as the total reflection cavity mirror.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A 976 nm continuous wave laser diode with maximum output power of 450 mW is used as the pump source through a wavelength division multiplexer (WDM). A fiber Bragg grating (FBG) with the reflectivity of 73% is used as the output cavity mirror.
4：Experimental Procedures and Operational Workflow:
The seed laser exhibits the average power of 30 mW at the incident pump power 300 mW. After three stages of fiber amplification, the final output power is scaled up to 101 W.
5：Data Analysis Methods:
The spectral bandwidth was measured by an optical spectral analyzer (YOKOGAWA AQ 6373). The pulse width was measured by an autocorrelator (Femtochrome, FR-103XL, resolution<5 fs).
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