Optical vortex pumped mid-infrared optical parametric oscillator

Area of Science:

• Optics and Photonics
• Nonlinear Optics
• Laser Physics

Background:

• Optical vortex pulses carry orbital angular momentum, enabling unique light-matter interactions.
• Optical parametric oscillators (OPOs) are versatile sources for generating light at various wavelengths.
• Generating vortex pulses in the mid-infrared spectrum is crucial for applications in spectroscopy and imaging.

Purpose of the Study:

• To demonstrate the first mid-infrared optical parametric oscillator (OPO) pumped by 1-μm optical vortex pulses.
• To generate fractional vortex pulses with specific topological charges in the mid-infrared region.
• To characterize the topological charges of the generated mid-infrared vortex pulses.

Main Methods:

• Utilizing 1-μm optical vortex pulses as the pump source for an optical parametric oscillator.
• Generating 2-μm fractional vortex pulses with half-integer topological charge.
• Producing 0.24-mJ vortex pulses with a topological charge of 1.
• Employing an interferometric technique combined with second-harmonic frequency conversion for topological charge observation.

Main Results:

• Successful demonstration of a mid-infrared OPO pumped by 1-μm optical vortex pulses.
• Generation of a 0.5-mJ, 2-μm fractional vortex pulse with a half-integer topological charge.
• Creation of 0.24-mJ vortex pulses with a topological charge of 1.
• Experimental verification of the topological charges of the mid-infrared vortex pulses.

Conclusions:

• The study presents a groundbreaking method for generating mid-infrared vortex pulses.
• The developed system offers a new pathway for creating tailored optical vortex beams in the mid-infrared.
• This advancement holds significant potential for applications requiring structured light in the mid-infrared spectrum.