Laser head and telescopic cavity for diode-pumped solid-state lasers

Claim 1

A solid-state laser head for producing coherent light, comprising: a solid-state laser material means with a largest cross sectional dimension d and a refractive index higher than the periphery, a diode bar means and a corner reflector means; wherein a) multiple micro-beams are produced by many individual emitters located within said diode bar means, based on the multiple micro-beams collective effect, serving as multiple incident beams; b) said corner reflector means reflects and divides the compilation of said multiple incident beams to four equal portions, and produces 4-side uniform pumping light into said solid-state laser material means from four different directions of the top, back, front, and bottom; and said solid-state laser material means is mounted within said corner reflector means; c) the absorption coefficient of said solid-state laser material at the pump wavelength is predetermined in the optimized condition, including the concentration of the pump power in the central lasing area, so as to obtain high pump density and laser gain in the central lasing area and high absorption efficiency of said laser material means, whereby resulting in a favorable condition for realizing the high quality laser operation, that is, mode-matched pumping, low order modes or TEM 00 mode operation, good output beam quality and high efficiency; wherein said absorption coefficient in said optimized condition is chosen to be the value which leads to I(d)/I(O)=10%-13% around, where I(O) is the intensity of the pump light incident on the laser material means and I(d) is the intensity of the pump light emerging from the side of the laser material opposite the incident side; d) further comprising an optical conditioning means, so that said multiple incident beams are collimated at least in one dimension and whose compilation has a vertical dimension four times of said dimension d; each of said portions having a vertical dimension equal to said dimension d whereby resulting in said incident beams to converge inward from the surface toward the central lasing region.