A 1.4 kW 780 nm pulsed diode laser, high duty cycle, passively side-cooled pump module

Area of Science:

• Optics and Photonics
• Semiconductor Lasers

Background:

• High-power diode lasers are crucial for various applications.
• Achieving high duty-cycle operation in diode lasers presents thermal management challenges.

Purpose of the Study:

• To present a novel diode laser module optimized for high duty-cycle operation.
• To characterize the optical output power and beam quality of the developed laser module.

Main Methods:

• Development of a micro-channel free diode laser module.
• Optimization for high duty-cycle (≥ 10%) operation.
• Characterization of optical in-pulse power and beam quality (M²) post-collimation.

Main Results:

• The diode laser module emits 1.4 kW optical in-pulse power near 780 nm.
• The module operates at high duty cycles (≥ 10%) in a micro-channel free design.
• Full collimation yields a nearly symmetric beam quality with M² values of 205 × 295 (vertical × horizontal).

Conclusions:

• A high-power, high duty-cycle diode laser module has been successfully developed.
• The micro-channel free design facilitates robust operation.
• The achieved beam quality is suitable for demanding optical applications.