Pulse simulations of a mirrored counterpropagating-QPM device

Area of Science:

• Nonlinear optics
• Wave propagation physics

Background:

• Quasi-phase-matching (QPM) is a technique to achieve efficient nonlinear optical frequency conversion.
• Counterpropagating configurations offer unique advantages in certain nonlinear optical processes.

Purpose of the Study:

• To investigate the performance of a basic mirrored counterpropagating quasi-phase-matched device.
• To determine the optimal device length for pulsed fundamental plane wave inputs.

Main Methods:

• Numerical simulation using the method of lines.
• Application of the relaxation method for solving the governing equations.
• Analysis of device performance under varying spatial pulse length to device length ratios.

Main Results:

• The study establishes an approximate upper bound for the practical device length.
• Optimal device length is found to be comparable to the spatial length of the input pulse.
• Performance is analyzed for different ratios of spatial pulse length to device length.

Conclusions:

• The findings provide practical guidelines for designing quasi-phase-matched devices for pulsed applications.
• Device length is a critical parameter that must be carefully matched to the input pulse characteristics.