| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain an optical element of a small size having functions of two diffraction gratings and one phaser and further to obtain a hologram laser unit which is integrated with a semiconductor laser, a photodetector and an optical diffraction element, is small in size and prevents the exit return light from a semiconductor laser from affecting the transmission of the semiconductor laser. <P>SOLUTION: The optical element 9 is obtained by superposing two transparent substrates 4 and 5 and laminating the phaser 3 consisting of a thin organic matter film between the transparent substrates 4 and 5 to constitute a laminated plate consisting of the transparent substrates 4 and 5 and the phaser 3 and forming the hologram diffraction grating 1 and the straight diffraction grating 2 on the front and rear 2 surfaces, respectively, of the laminated plate. The hologram laser unit is obtained by integrally forming the semiconductor laser, the photodetector and the optical element 9. <P>COPYRIGHT: (C)2003,JPO |
