Arbitrary pulse shaping in a mid-infrared optical parametric oscillator source

Area of Science:

• Optics and Photonics
• Nonlinear Optics
• Laser Physics

Background:

• Coherent mid-infrared (mid-IR) light sources are crucial for various spectroscopic applications.
• Existing sources often lack precise temporal control over output pulse shapes.
• Optical parametric oscillators (OPOs) offer tunability but require advanced control for pulse shaping.

Purpose of the Study:

• To demonstrate a novel mid-IR light source capable of producing arbitrary nanosecond pulse shapes.
• To utilize a periodically poled lithium niobate (PPLN) OPO for temporal pulse shaping.
• To provide a versatile, low-energy mid-IR source for seeding high-energy amplification systems.

Main Methods:

• Employing a periodically poled lithium niobate (PPLN) optical parametric oscillator (OPO).
• Controlling the temporal shape of the 1064-nm pump laser to compensate for cavity dynamics.
• Achieving temporal pulse shaping of the mid-IR output at a 1.9 µm signal wavelength.

Main Results:

• Demonstrated arbitrary pulse shaping in the nanosecond regime for mid-IR generation.
• Successfully compensated for cavity dynamics to enable precise temporal control.
• Produced complex pulse profiles, showcasing the versatility of the PPLN OPO.
• Achieved a low-energy output of approximately 1 mJ per pulse.

Conclusions:

• The developed PPLN OPO system offers versatile temporal pulse shaping capabilities for mid-IR generation.
• This source is well-suited as a seed for high-energy amplification systems requiring temporally optimized pulses.
• The ability to control pulse shapes opens new possibilities in mid-IR applications requiring tailored temporal profiles.