Semiconductor laser device and optical pick-up device employing the same
A laser device and semiconductor technology, applied in beam guiding devices, optical recording/reproducing, optical recording heads, etc., can solve the problems of time-consuming and labor-intensive, complex optical pickup structure, etc., and achieve the effect of reducing the number of
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[0014] see figure 2 , an optical pick-up device 99 compatible with different disc specifications includes the semiconductor laser device 10 of the present invention, a collimator lens 50 , a wavelength selective mirror 55 and an objective lens 60 . Wherein, the semiconductor laser device 10 can emit laser beams with different wavelengths, and the collimator lens 50 and the objective lens 60 have optical parameters matching the short-wavelength laser beams. The objective lens 60 has a numerical aperture corresponding to the specification of a high-density optical disc. The wavelength selective mirror 55 is located on one side of the objective lens 60 and has different apertures for incident beams of different wavelengths.
[0015] The semiconductor laser device 10 includes a first laser source 1a, a second laser source 1b, a photodetection element 2, a first holographic element 3a, a second holographic element 3b, a composite prism 4, and a packaging case 12 . Wherein, the ...
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