Patent ID: 7436561

Claim:
A hologram laser unit, comprising: a light source emitting light beams of a first wavelength and a second wavelength; a light receiving element receiving a light beam emitted from the light source and reflected by an information recording surface of an optical recording medium; and a hologram coupled member having a first optical element and a second optical element, the first optical element diffracting an incident light, included in the light beam reflected by the information recording surface, of the first wavelength which is polarized in a first polarization direction, to a direction toward the light receiving element and transmitting an incident light, included in the light beam reflected by the information recording surface, which is polarized in a second polarization direction perpendicular to the first polarization direction, and the second optical element diffracting an incident light, included in the light beam reflected by the information recording surface, of the second wavelength which is polarized in the second polarization direction to a direction toward the light receiving element and transmitting an incident light, included in the light beam reflected by the information recording surface, which is polarized in the first polarization direction.