Ultrafast structured light through nonlinear frequency generation in an optical enhancement cavity.

Area of Science:

• Optics and Photonics
• Laser Physics
• Nonlinear Optics

Background:

• Structured light generation is crucial for applications in microscopy and fundamental physics.
• Current methods using spatial light modulators have limitations regarding wavelength, pulse duration, and power.
• Developing versatile structured light generation techniques is an ongoing research area.

Purpose of the Study:

• To present a novel method for generating shaped laser beams.
• To overcome the limitations of existing structured light generation techniques.
• To enable structured light generation across a wide range of wavelengths and optical powers.

Main Methods:

• Exploiting the frequency difference between higher-order modes due to the Gouy phase.
• Utilizing cavity mode matching for selective coupling into higher-order modes.
• Employing optical cavities as spatial filters.
• Integrating sum-frequency generation in a nonlinear crystal as an output coupler.

Main Results:

• Demonstrated a method for generating structured light applicable from UV to IR wavelengths.
• Enabled the generation of structured light for ultrafast pulses.
• Showcased the capability to handle a large range of optical powers.
• Successfully created ultrafast, frequency comb structured light.

Conclusions:

• The presented method offers a versatile and powerful approach to structured light generation.
• This technique overcomes significant limitations of existing spatial light modulator-based methods.
• The ability to generate structured light across broad spectral ranges and power levels opens new avenues for research and applications.