High-average-power, 50-fs parametric amplifier front-end at 1.55 μm

Area of Science:

• Laser Physics
• Nonlinear Optics
• Spectroscopy

Background:

• Developing high-power, ultrashort pulsed laser sources is crucial for advanced scientific research.
• Optical Parametric Amplifiers (OPAs) offer wavelength tunability but often face limitations in average power and efficiency.
• Scalable OPA systems are needed to reduce costs and enable new experimental capabilities.

Purpose of the Study:

• To present an average-power-scalable, two-stage optical parametric chirped pulse amplifier (OPCPA).
• To demonstrate high energy output and efficient conversion for ultrashort pulses at specific infrared wavelengths.
• To establish a front-end for a larger system enabling novel laser-based imaging techniques.

Main Methods:

• Utilized a two-stage optical parametric chirped pulse amplification architecture.
• Employed a 1030-nm pump source to amplify signal and idler pulses.
• Characterized pulse energy, duration, spectral properties, and energy conversion efficiency.

Main Results:

• Achieved 90-μJ signal pulses at 1.55 μm and 45-μJ idler pulses at 3.1 μm at 100 kHz repetition rate.
• Demonstrated signal pulse recompression to near the Fourier transform limit (~50 fs) with minimal loss.
• Attained an overall energy conversion efficiency of 19% from pump to recompressed signal.

Conclusions:

• The developed two-stage OPCPA system offers significant power scalability and high efficiency.
• The system's performance reduces the cost per watt of pump power, making advanced laser applications more accessible.
• This source serves as a critical front-end for a three-stage system, facilitating novel research in molecular structure imaging and chemical reactivity studies.