Optical parametric amplification and oscillation assisted by low-frequency stimulated emission

Area of Science:

• Nonlinear Optics
• Quantum Optics
• Laser Physics

Background:

• Optical parametric amplification (OPA) and oscillation (OPO) are vital for generating coherent light in challenging spectral regions.
• Traditional parametric processes rely on frequency down-conversion, limiting signal frequencies to be lower than the pump frequency.
• Existing methods cannot achieve parametric gain for signal waves with frequencies higher than the pump wave.

Purpose of the Study:

• To propose a novel method for achieving upconversion optical parametric amplification and oscillation.
• To enable the generation of coherent light at frequencies higher than the pump source.
• To overcome the inherent frequency limitation of conventional parametric processes.

Main Methods:

• Investigated a new route for upconversion parametric processes.
• Utilized stimulated emission of an auxiliary idler wave to assist the amplification process.
• Resonated the signal field within an optical cavity to achieve parametric oscillation.

Main Results:

• Demonstrated the theoretical possibility of upconversion optical parametric amplification.
• Achieved parametric oscillation by resonating the signal field.
• Provided specific design parameters for observing upconversion OPO at 465 nm using a periodically poled lithium niobate (PPLN) crystal doped with Nd(3+) ions.

Conclusions:

• The proposed method successfully enables upconversion optical parametric amplification and oscillation.
• This research expands the capabilities of parametric light generation to higher frequencies.
• The findings pave the way for new laser sources in previously inaccessible spectral regions.