High-brightness and high-efficiency diode laser module based on double wavelength division multiplexing external...

Area of Science:

• Optics and Photonics
• Semiconductor Lasers

Background:

• Spectral beam combining is crucial for high-power diode lasers.
• Existing cavity designs face limitations in electro-optical conversion efficiency and brightness.

Purpose of the Study:

• To propose and demonstrate a new external cavity structure for diode lasers.
• To enhance electro-optical conversion efficiency and brightness in spectral beam combining.

Main Methods:

• Utilizing double wavelength division multiplexing (WDM) external cavities.
• Placing one WDM cavity on the rear for wavelength locking and another on the front for beam combining.

Main Results:

• Achieved a maximum output power of 7.5 W.
• Reached a brightness of 100 MW cm⁻² sr⁻¹ with 46.5% electro-optical conversion efficiency.
• Demonstrated a 6.5% improvement in electro-optical conversion efficiency compared to standard cavities.

Conclusions:

• The double WDM external cavity structure offers a novel approach for high-brightness, high-efficiency diode laser sources.
• This technology advances spectral beam combining capabilities for diode lasers.