Patent ID: 6120191
Filing Date: 2000-09-19
Classification: G02B

Abstract:
A laser diode module comprising:a laser diode for emitting a laser beam;a focusing lens for focusing the laser beam emitted by said laser diode, said focusing lens having a first surface and a second surface opposite said first surface, said focusing lens having diffraction zones formed on at least one of said first surface and said second surface, said diffraction zones having a shape and being spaced apart such that a focal position shift of the laser beam due to a change in oscillation wavelength of said laser diode due to a temperature change is in an opposite direction to a focal position shift of the laser beam due to thermal expansion or thermal contraction of said focusing lens and an index of refraction of said focusing lens; anda holder holding said laser diode, said focusing lens, and an end of an optical fiber along an optical axis of the laser beam emitted by said laser diode, wherein said holder holds the end of the optical fiber at a predetermined position, and wherein said focusing lens is positioned to transmit the laser beam emitted from said laser diode and focus the laser beam onto the end of the optical fiber.