82Onm high power laser (r2Spe laser) which can oscillate at 5OmW up to IOO.C has been developed by employing I4OCVD technique. Typical characteristj.c temperature To is 160K. The astigrmatic distance is less than 6Um in the power range between l-mW and 30mW, and S/N ratio (f=2OkHz, BW=3OOHz) is Iarger than 6tdB. I.{TTF at 60oC, 3OmW is estimated to be longer than 2OOOO hours. The I-SPB laser is a promising light source for ODD (optical disk drive) systems. Recently, optical disk drive (ODD) grow thin epitaxial l.y.r".
Various types of visible laser diode have been reported as light sources for optical disk reading, such as audio and video disks. However, among them single-longitudinal-mode lasers need special means, such as super imposing (radio) high frequency on the bias current for applications in video disk reading, which requires about a 30-dB higher SNR than audio disk reading. Because without such means the noise of single-longitudinal-mode lasers increases drastically when a part of the reflected output is returned to the laser diode, resulting in mode jumping. On the other hand, multilongitudinal-mode laser diodes do not show such significant noise deterioration.
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