Decoupling phase-matching bandwidth and interaction geometry using non-collinear quasi-phase-matching gratings

Area of Science:

• Nonlinear Optics
• Quantum Optics
• Laser Physics

Background:

• Broadband optical parametric amplification (OPA) typically requires non-collinear phase-matching.
• This non-collinearity links pulse bandwidth to beam geometry, restricting system design.
• Existing methods limit the geometrical flexibility of OPA systems.

Purpose of the Study:

• To demonstrate a novel quasi-phase-matching (QPM) geometry for broadband OPA.
• To enable collinear broadband phase-matching, decoupling bandwidth from beam geometry.
• To simplify the architecture of ultra-broadband OPA systems.

Main Methods:

• Introduction of a transverse component to the QPM grating.
• Imposing additional momentum on the generated wave via the modified QPM grating.
• Experimental demonstration of two configurations utilizing this QPM geometry.

Main Results:

• Achieved broadband phase-matching without a non-collinear angle between interacting waves.
• The transverse QPM component detunes the group-velocity matching wavelength.
• Presented experimental validation of the proposed collinear QPM geometry.

Conclusions:

• The demonstrated QPM geometry allows for collinear broadband OPA.
• This approach decouples bandwidth and beam geometry, simplifying OPA system design.
• Potential for further simplification of ultra-broadband OPA architectures is proposed.