Efficient transmissive remote phosphor configuration for a laser-driven high-luminance white light source.

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Laser-driven white light sources are crucial for high-luminance applications.
• Reflective configurations often present complex optical design challenges.

Purpose of the Study:

• To investigate the efficacy of a transmissive configuration for laser-driven white light sources.
• To demonstrate the performance enhancement using a sapphire half-ball lens.

Main Methods:

• Utilized a transmissive optical setup incorporating a sapphire half-ball lens.
• Conducted detailed experimental measurements of light output and luminance.
• Performed opto-thermal simulations to analyze heat dissipation and performance limits.

Main Results:

• The sapphire half-ball lens significantly improved the efficiency of the transmissive configuration.
• Experimental results showed a light output of 6550 lm and luminance of 67 MCd/m².
• Simulations predicted a potential light output exceeding 20000 lm and luminance of 209 MCd/m².
• Enhanced heat dissipation from the single-crystal phosphor converter was observed.

Conclusions:

• A transmissive configuration with a sapphire half-ball lens offers a viable and efficient approach for high-luminance white light sources.
• The sapphire lens improves optical efficiency and thermal management, enabling higher light output and luminance.
• This design overcomes the optical design challenges associated with reflective configurations.