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Sub-100-fs Kerr lens mode-locked Yb:Lu2O3 thin-disk laser oscillator operating at 21 W average power
Optics Express
|June 6, 2019
Summary
Researchers achieved significant power scaling in ultrafast lasers using a Kerr lens mode-locked (KLM) Ytterbium-doped lutetium oxide (Yb:Lu2O3) thin-disk laser (TDL). This advancement enables higher average power and efficiency for sub-100-femtosecond pulse generation.
Area of Science:
- Laser Physics
- Ultrafast Optics
- Materials Science
Background:
- Ytterbium-doped lutetium oxide (Yb:Lu2O3) is a promising gain medium for high-power lasers.
- Kerr lens mode-locking (KLM) is a key technique for generating ultrashort laser pulses.
- Power scaling of thin-disk laser (TDL) oscillators in the sub-100-femtosecond regime presents challenges.
Purpose of the Study:
- To investigate the power-scaling capabilities of a KLM Yb:Lu2O3 TDL oscillator.
- To achieve higher average power and optical-to-optical efficiency for sub-100-femtosecond pulses.
- To explore cavity designs facilitating power scaling without edge-of-stability operation.
Main Methods:
- Implemented a higher round-trip gain scheme by increasing passes through the Yb:Lu2O3 thin-disk gain element.
- Utilized Kerr lens mode-locking (KLM) in a thin-disk laser (TDL) oscillator configuration.
- Analyzed cavity design parameters for both continuous-wave (CW) and mode-locked operation.
Main Results:
- Achieved a factor of two increase in average power and nearly a threefold increase in optical-to-optical efficiency compared to previous sub-100-fs results.
- Generated pulses with 95 fs duration at 21.1 W average power and a 47.9 MHz repetition rate.
- Demonstrated successful mode-locking without requiring operation at the edge of the stability zone.
Conclusions:
- Yb:Lu2O3 KLM TDL oscillators are highly suitable for power scaling in the sub-100-femtosecond regime.
- The demonstrated power-scaling approach offers a viable path towards multi-hundred-watt average power levels.
- Future work can focus on further optimizing cavity design and gain parameters for even higher output powers.
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