1.5-mum emissions from laser-diode-pumped Nd-doped microchip solid-state lasers.

Area of Science:

• Laser Physics
• Materials Science

Background:

• Neodymium-doped lasers are crucial for various optical applications.
• Microchip laser configurations offer compact and efficient laser sources.
• Understanding emission mechanisms is key to optimizing laser performance.

Purpose of the Study:

• To investigate and characterize 1.5-micrometer emissions from specific Neodymium-doped microchip lasers.
• To identify the underlying physical mechanisms responsible for these emissions.
• To explore the potential of these lasers for generating new wavelengths.

Main Methods:

• Utilized Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG), Neodymium-doped Yttrium Orthovanadate (Nd:YVO4), and Lithium Neodymium Tetraphosphate (LiNdP4O12) microchip lasers.
• Pumped the microchip lasers using laser diodes.
• Analyzed the observed 1.5-micrometer emissions using spectroscopic techniques.
• Identified the generation mechanism through analysis of lasing fields and Stokes components.

Main Results:

• Successfully observed coherent 1.5-micrometer emissions from Nd:YAG, Nd:YVO4, and LiNdP4O12 microchip lasers.
• Attributed the emissions to high-energy modified lattice vibrations due to Neodymium ions.
• Identified stimulated intracavity Raman scattering, enhanced by the microchip design, as a contributing factor.
• Determined that a four-wave mixing process involving lasing and Stokes fields generates new adjacent 1.5-micrometer emissions.

Conclusions:

• Neodymium-doped microchip lasers can produce significant 1.5-micrometer emissions.
• Modified lattice vibrations and stimulated Raman scattering are key mechanisms.
• Four-wave mixing plays a role in generating adjacent emission lines, broadening spectral possibilities.