Laser diode assembly

An optical head apparatus for recording/reproducing information onto/from an optical recording medium, comprising:

• an optical head capable of moving relative to the optical recording medium, the optical head including a first unit having a first surface and a mounting surface inclined to the first surface, and a second unit comprising a semiconductor substrate on the first unit and having a second surface and a reflecting surface that coincides with a (111) surface of the semiconductor substrate inclined to the second surface;
• a laser diode on the second surface of the optical head for irradiating the reflecting surface with a laser beam along a direction parallel to the second surface;
• and
• a lens for condensing the laser beam onto the optical recording medium,
• wherein the second surface of the second unit is parallel to the mounting surface, and an angle between a reflected laser beam from the reflecting surface and the first surface is substantially 90 degrees.

A transceiver apparatus having at least a pair of terminals for transmitting/receiving optical information, each terminal comprising:

• a first unit having a first surface and a mounting surface inclined to the first surface;
• a second unit made of a semiconductor substrate on the first unit, having a second surface and a reflecting surface that coincides with a (111) surface of the semiconductor substrate inclined to the second surface;
• and
• a laser diode on the second surface for irradiating the reflecting surface with a laser beam along a direction parallel to the second surface;
• wherein the second surface is parallel to the mounting surface, and an angle between a reflected laser beam from the reflecting surface and the first surface is substantially 90 degrees.