Semiconductor laser device and optical read-writing device
A laser device and semiconductor technology, which is applied to semiconductor lasers, laser cooling devices, beam guiding devices, etc., can solve the problems of increased signal drift, deterioration of the signal processing capability of optical read-write devices, unstable oscillation of laser beams, etc., and achieves low cost. , reduce the effect of reflected light
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no. 1 example
[0093] figure 1 A schematic structure of the optical read / write device according to the first embodiment of the present invention is shown. The optical reading and writing device includes a semiconductor laser device 1 , a three-beam generating diffraction grating 2 , a beam splitter 3 , a collimating lens 4 , an objective lens 5 and a photodetector 7 .
[0094] The semiconductor laser device 1 is composed of a main body 14 and a polarization diffraction grating 15 . The three-beam generating diffraction grating 2 is arranged so that the light emitted from the main body 14 of the semiconductor laser device 1 passes through the three-beam generating diffraction grating 2 . The collimating lens 4 changes the light passing through the three-beam generating diffraction grating 2 into parallel light. The objective lens 5 converges the parallel light onto the surface of the optical disc 6 as the object to be irradiated, that is, the optical recording medium. A beam splitter 3 is ...
no. 2 example
[0118] image 3 A perspective view of a semiconductor laser device according to a second embodiment of the present invention is shown. Figure 4 shows that one has image 3 A schematic cross-sectional view of the optical read / write device for the semiconductor laser device shown.
[0119] image 3 The illustrated semiconductor laser device 60 has a semiconductor laser 37 , a hologram 34 and a light receiving device 38 . Such as Figure 4 As shown, a semiconductor laser 37 is a light source for emitting light to an optical disk 65 as an optical recording medium. The hologram device 34 has a signal hologram 35 and a polarization diffraction grating 36 .
[0120] The signal hologram 35 guides the light reflected on the optical disc 65 toward the light receiving device 38 for signal detection. The light receiving device 38 receives the light 39 guided by the signal hologram 35 . The polarization diffraction grating 36 diffracts the zeroth order diffracted light diffracted b...
no. 3 example
[0150] Figure 13 A semiconductor laser device according to a third embodiment of the present invention is shown.
[0151] A semiconductor laser device 80 of the third embodiment has a rod 81 as a base and a semiconductor laser 83 as a light source. A semiconductor laser 83 is mounted on a head 82 which is a part of the rod 81 . The rod 81 is composed of a base portion 81a and a head 82 protruding from the base portion 81a. A cover 84 covering the semiconductor laser 83 and the head 82 is attached to the base portion 81 a of the rod 81 . The semiconductor laser 83 emits the laser beam L from the light emitting end face 83 a which is the front end surface of the semiconductor laser 83 . The laser beam L is composed of laser light including P-polarized light and S-polarized light.
[0152] The hologram 85 is mounted to the top plate 84a of the cover 84 so as to cover a window (not shown) formed in the top plate 84a. The hologram 85 includes a polarization diffraction gratin...
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