High-power and widely tunable mid-infrared optical parametric amplification based on PPMgLN

Area of Science:

• Nonlinear Optics
• Laser Physics
• Materials Science

Background:

• Optical parametric amplifiers (OPAs) are crucial for generating tunable laser light.
• Periodically poled magnesium-doped lithium niobate (PPMgLN) offers unique nonlinear optical properties for OPA development.
• High-power and tunable laser sources are essential for various scientific and industrial applications.

Purpose of the Study:

• To develop and characterize a high-power, widely tunable optical parametric amplifier (OPA).
• To investigate the performance of a PPMgLN-based OPA pumped by a 1.064 μm MOPA laser.
• To assess the tunability, output power, conversion efficiency, and beam quality of the developed OPA system.

Main Methods:

• Utilized periodically poled magnesium-doped lithium niobate (PPMgLN) crystals as the gain medium.
• Employed a pulsed 1.064 μm MOPA (master oscillator power amplifier) laser as the pump source.
• Tuned the output wavelength by adjusting the crystal temperature and measured output power, efficiency, and beam quality (M²).

Main Results:

• Achieved continuous wavelength tunability from 2.68 to 3.07 μm.
• Delivered average output power ranging from 74.6 to 66.7 W for 310 W of pump power.
• Observed optical-to-optical conversion efficiencies of approximately 22.8% at 2.68 μm and 20.5% at 3.07 μm.
• Measured an output beam quality factor (M²) below 4 across the entire tuning range.

Conclusions:

• The developed PPMgLN-based OPA system provides a high-power and widely tunable light source.
• The system exhibits excellent optical-to-optical conversion efficiency and good beam quality.
• This OPA technology holds significant potential for applications requiring tunable mid-infrared radiation.