Abstract

Diffraction patterns were calculated in order to understand the requirements for achieving efficient imaging of high-power diode laser far-fields in optical recording systems⁽¹⁾ as a function of truncation. A distribution of 22 CDH-LOC diode lasers⁽²⁾ was studied to determine the variations likely to be encountered in real devices. At 40 mW 50% duty-cycle operation, the full-width at half-maximum (FWHM) was found to range from 6.2° to 10.2° with an average value of 8.1° ± 1.3° (one standard deviation) in the direction parallel to the plane of the junction. In the perpendicular directions, the FWHM's ranged from 18.4° to 35.6° with an average and standard deviation of 27.1° ± 3.4°. We are interested in whether recording optics must be specified for each particular laser or may a single set of appropriately chosen fixed optics yield adequate efficiency for spot formation.

© 1983 Optical Society of America