Nd:YAG laser pumped at 946 nm

Area of Science:

• Lasers and Photonics
• Materials Science

Background:

• Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) lasers are widely used.
• Optimizing pump schemes is crucial for enhancing laser efficiency and reducing thermal load.
• Minimizing the quantum defect between pump and laser photons is a key objective in laser design.

Purpose of the Study:

• To investigate a novel pump-lase scheme for Nd:YAG lasers using 946 nm pumping.
• To reduce the quantum defect compared to existing Nd:YAG laser pump schemes.
• To report the first experimental realization of this specific pump-lase configuration.

Main Methods:

• Pumping a Nd:YAG crystal at 946 nm and achieving lasing at 1064 nm.
• Measuring the absorption coefficient and linewidth of the 946 nm absorption line at room temperature.
• Investigating the effect of elevated crystal temperatures on absorption cross-sections.

Main Results:

• The 946 nm absorption line in 1% Nd:YAG exhibits an absorption coefficient of ~0.075 cm⁻¹ and a linewidth of ~1 nm at room temperature.
• These parameters necessitate narrow-bandwidth pumping and a long absorption path.
• Increased crystal temperature enhances absorption cross-sections at 946 nm and 938 nm due to thermal population effects.

Conclusions:

• The 946 nm pump-lase scheme for Nd:YAG is successfully realized for the first time.
• Elevating crystal temperature offers a potential method to improve pump absorption efficiency.
• Further research can explore optimizing this temperature-dependent absorption for practical laser systems.