Collimating light beams semiconductor laser diode array

In the technique of DPL end-pumped method is adopted generally, but in this application it's essential for the semiconductor laser to have very high power density. Because it exists a intrinsic divergence angle of about 40/spl deg/ degrees in the direction of "fast" axle for the semiconductor laser diodes. Consequently, it sharply decreases the light power density in the direction of light propagation. It's an effective way of collimating the divergence light beams in the direction of "fast" axle for improving power density. In this letter we describe the technique of collimating the divergence angle in the direction of "fast" axle performed on the single bar of semiconductor laser by employing fiber core as microlens and approximately collimating light beams with divergence of less than 6/spl deg/ degrees, stacking the single bar in two dimensions, we got two-dimension laser array with the output power of 1300 watts and the divergence is less than 10 (FWHM) degrees. Four 1300W laser arrays have been assembled together and 5000W power has been produced.