Mid-infrared quasi-parametric chirped-pulse amplification based on Sm:LGN crystals

Area of Science:

• Laser Physics
• Materials Science
• Nonlinear Optics

Background:

• Mid-infrared (MIR) ultrashort pulses are crucial for various scientific applications.
• Developing efficient methods for generating MIR pulses remains a significant challenge.
• Quasi-parametric chirped-pulse amplification (QPCPA) offers a promising route for MIR pulse generation.

Purpose of the Study:

• To numerically demonstrate highly efficient MIR QPCPA.
• To investigate the potential of a Sm³⁺-doped La₃Ga_5.5Nb_0.5O₁₄ (Sm:LGN) crystal for QPCPA.
• To explore the conversion of 1 µm laser pulses to MIR ultrashort pulses.

Main Methods:

• Numerical simulation of QPCPA.
• Utilizing a Sm³⁺-doped La₃Ga_5.5Nb_0.5O₁₄ (Sm:LGN) crystal.
• Employing a pump wavelength around 1 µm.

Main Results:

• Achieved highly efficient MIR QPCPA with femtosecond signal pulses centered at 3.5 or 5 µm.
• Observed conversion efficiency approaching the quantum limit.
• Demonstrated robustness against phase-mismatch and pump-intensity variation due to suppressed back conversion.

Conclusions:

• Sm:LGN crystal enables efficient MIR QPCPA.
• This technique provides an efficient pathway for generating MIR ultrashort pulses from established 1 µm lasers.
• The developed QPCPA method offers a robust and efficient solution for MIR pulse generation.