Encapsulated rod for efficient thermal management in diode-side-pumped Nd:YAG lasers

Area of Science:

• Laser Physics
• Thermal Management
• Optical Engineering

Background:

• Diode-side-pumped solid-state lasers are crucial for various applications.
• Effective thermal management is essential for optimizing laser performance and preventing damage.
• Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) lasers are widely used due to their favorable properties.

Purpose of the Study:

• To theoretically analyze energy deposition, temperature distribution, and thermally induced birefringence in a specific Nd:YAG laser design.
• To evaluate the feasibility of achieving high output powers with efficient cooling.
• To explore the impact of a novel rod mounting technique on thermal performance.

Main Methods:

• Theoretical calculations were performed to model heat generation and transfer within the laser rod.
• The optical fixing of the laser rod into a right-rectangular prism with a square cross-section was analyzed.
• Thermal effects such as temperature gradients and birefringence were simulated.

Main Results:

• The proposed design facilitates uniform cooling of the Nd:YAG laser rod.
• Average output powers exceeding 5 W are predicted.
• Optical-to-optical efficiencies of approximately 20% for long-pulse and 10% for Q-switched operation are feasible.
• Simple cooling techniques, including Peltier cooling, are effective.

Conclusions:

• The investigated diode-side-pumped Nd:YAG laser design offers efficient thermal management.
• The configuration allows for significant output power with high optical-to-optical efficiency.
• The design is compatible with practical and convenient cooling solutions.