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Single-cycle, MHz repetition rate THz source with 66 mW of average power
Optics Letters
|May 2, 2020
Summary
We achieved record terahertz (THz) power using a novel laser setup. This breakthrough enables high-performance THz spectroscopy with improved signal-to-noise ratios.
Area of Science:
- Optics and Photonics
- Condensed Matter Physics
- Quantum Electronics
Background:
- Terahertz (THz) generation is crucial for advanced spectroscopy.
- Lithium niobate is a promising material for nonlinear optical processes.
- High average power THz sources are needed for demanding applications.
Purpose of the Study:
- To demonstrate efficient THz generation using the tilted pulse front method.
- To optimize THz generation parameters for high average power.
- To identify limitations and future potential for THz source scaling.
Main Methods:
- Utilized a compact, amplifier-free mode-locked thin-disk oscillator.
- Employed the tilted pulse front technique in lithium niobate.
- Optimized pump spot size and pulse duration for conversion efficiency.
Main Results:
- Achieved unprecedented 100 W average pump power at 13.3 MHz repetition rate.
- Generated a maximum THz average power of 66 mW, a record for few-cycle sources.
- Identified beam walk-off as a key limiting factor for conversion efficiency.
Conclusions:
- Demonstrated a scalable pathway towards watt-level THz average power.
- Highlighted the potential for high-fidelity THz spectroscopy at megahertz rates.
- Opened avenues for advanced linear and nonlinear THz spectroscopy experiments.
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