Isolator-free 60 W diamond Raman laser at 607 nm

Area of Science:

• Optics and Photonics
• Laser Physics
• Materials Science

Background:

• Diamond Raman lasers offer potential for visible light generation.
• Efficient frequency conversion is crucial for various applications.
• Managing back reflections and nonlinear effects is key for laser stability.

Purpose of the Study:

• To demonstrate an intra-cavity frequency doubled diamond Raman laser.
• To achieve high output power in the visible spectrum.
• To investigate the impact of cavity design and nonlinear effects on laser performance.

Main Methods:

• Utilized a z-fold cavity design for a diamond Raman laser.
• Employed a 1045 nm fiber laser as the pump source.
• Configured the cavity to prevent back reflections and avoid isolators.

Main Results:

• Achieved laser operation at 607 nm.
• Generated a maximum output power of 60 W across two beams.
• Obtained a maximum single-beam output power of 40 W.
• Demonstrated an optical conversion efficiency of 28%.

Conclusions:

• The z-fold cavity design effectively managed back reflections.
• Stimulated Brillouin scattering negatively impacted output power and frequency stability above 10 W.
• Further optimization is needed to mitigate nonlinear effects for improved high-power operation.