Vertical-cavity surface-emitting lasers (VCSELs) have been used to optically pump a planar-cavity, Nd:YVO4 microchip laser. Lasing was achieved with a minimum pump power of 0.8 mW from a 10 μm diameter, circular aperture VCSEL. The microchip laser operates in a fundamental Gaussian mode of 40-50 μm diameter for a range of pump sizes from 10 to 50 μm with a threshold pump power proportional to the pump size. These characteristics indicate that the mode formation is controlled by gain-induced refractive index changes within a cavity that is positively detuned from the atomic resonance. Stable, Gaussian mode formation is also achieved when directly pumping the microchip lasers with no intervening optics.
- Laser diodes
- Semiconducting III-V materials
- Solid state lasers
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics