Supercontinuum-seeded few-cycle mid-infrared OPCPA system.

Area of Science:

• Laser Physics
• Nonlinear Optics
• Materials Science

Background:

• Optical Parametric Amplification (OPCPA) is a key technology for generating tunable ultrashort laser pulses.
• Few-cycle pulse generation is crucial for advanced spectroscopic techniques and nonlinear phenomena.
• High-energy femtosecond lasers are essential tools in various scientific disciplines.

Purpose of the Study:

• To propose and demonstrate a novel OPCPA architecture for generating few-cycle pulses at 3070 nm and 1550 nm.
• To utilize a high-energy femtosecond ytterbium-doped fiber amplifier as a pump source.
• To investigate power scaling limitations in MgO:PPLN-based OPCPA systems.

Main Methods:

• Employing a femtosecond ytterbium-doped fiber amplifier for high-energy pumping.
• Directly seeding the OPCPA with a supercontinuum generated in bulk YAG.
• Utilizing a Magnesium Oxide-doped Periodically Poled Lithium Niobate (MgO:PPLN) crystal for parametric amplification.
• Implementing simplified dispersion management strategies.

Main Results:

• Successful demonstration of an OPCPA architecture emitting few-cycle pulses at 3070 nm and 1550 nm.
• Achieved dual output: 20 µJ, 49 fs signal pulses at 1550 nm and 10 µJ, 72 fs idler pulses at 3070 nm.
• Short pump pulse duration enabled direct supercontinuum seeding and broad optical gain bandwidth.

Conclusions:

• The developed OPCPA system provides a robust platform for generating high-energy, few-cycle pulses at two distinct wavelengths.
• The study identified and discussed power scaling limitations related to beam distortion in the MgO:PPLN OPCPA stage.
• This work advances the capabilities of ultrashort pulse generation for demanding scientific applications.