Integrated confocal optical pick-up head with a hologram and a polarizer mounted on each side of a transparent heat sink

An optical head comprising:

• a light-emitting element having a top surface disposed on a substrate for emitting light toward an irradiated recording medium;
• a transparent heat sink coupled to said light-emitting element and attached on said top surface;
• a hologram device mounted on said transparent heat sink for diffracting light returning from the irradiated medium;
• a polarizer supported on said transparent heat sink for polarizing the light diffracted by said hologram device to produce first polarized light that has passed through said polarizer and second polarized light that has been reflected by said polarizer;
• a reflecting film attached on said transparent heat sink, while film reflects polarized light which travels inside said transparent heat sink;
• a plurality of light-detecting elements including a first light-detecting element disposed on said substrate for detecting said first polarized light, and a second light-detecting element disposed on said substrate for detecting said second polarized light;
• and
• means for generating a magneto optical signal as the difference between the intensities of the first and second polarized lights detected respectively by said first and second light-detecting elements.