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Published on: September 22, 2017
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Low-threshold supercontinuum generation in a homogeneous bulk material at 76 MHz pulse repetition rate
Optics Letters
|September 1, 2023
Summary
Researchers achieved high-power, low-threshold supercontinuum generation in bulk potassium gadolinium tungstate (KGW) using a Yb:KGW oscillator. This robust, damage-free method produced an octave-spanning supercontinuum, paving the way for advanced optical applications.
Area of Science:
- Laser Physics
- Nonlinear Optics
- Materials Science
Background:
- Supercontinuum generation is crucial for various spectroscopic and photonic applications.
- Achieving high average power and low threshold in bulk materials remains a challenge.
Purpose of the Study:
- To demonstrate high average power, low threshold supercontinuum generation in a homogeneous bulk material.
- To investigate the performance of undoped potassium gadolinium tungstate (KGW) for this application.
Main Methods:
- Utilized a Yb:KGW oscillator operating at 76 MHz pulse repetition rate.
- Employed amplified and unamplified pulses for supercontinuum generation.
- Characterized the supercontinuum using filament-induced luminescence, angle-resolved spectral measurements, and second harmonic frequency-resolved optical gating (SHG-FROG).
Main Results:
- Generated an octave-spanning supercontinuum in undoped KGW with a total average pump power of 6.4 W.
- Demonstrated robust, damage-free, long-term performance.
- Observed characteristic phenomena including beam filamentation, conical emission, and phase-retrieved pulse splitting.
Conclusions:
- Undoped KGW is a promising material for high-power, low-threshold supercontinuum generation.
- The observed phenomena confirm the supercontinuum generation process.
- The technique offers a stable and efficient method for producing broadband light sources.
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