Abstract
Dynamic wavelength shifts of a monolithic, two-beam laser diode for a two-beam optical head in optical disk drives were analyzed with a streak camera system. The wavelength shift did not exceed 3 nm for the recording beam which was operated in a series of pulses, and the reproducing beam which was operated continuously showed no shift. The focusing characteristics on the basis of the wavelength shift and specifications of the optical head were also calculated. The dynamic displacement of the focal points caused by the wavelength shifts was so small as compared with the depth of focus in the optical head that the recording and reproducing characteristics were hardly influenced.
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Shinoda, M., Kime, K. Properties of a two-beam laser diode and focusing characteristics of a two-beam optical head. Optical Review 1, 188–190 (1994). https://doi.org/10.1007/BF03254858
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DOI: https://doi.org/10.1007/BF03254858