Semiconductor laser device
AssigneeKabushiki Kaisha Toshiba
InventorsGenichi Hatakoshi, Hideto Furuyama
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Abstract
Disclosed is a semiconductor laser device capable of minimizing the spot diameter of a laser light and also capable of improving the transmittance of light passing through a fine aperture. The semiconductor laser device comprises a light absorption film provided with a fine aperture on the outside of the light-emitting surface of the semiconductor laser element. The aperture is formed such that the aperture width W1 in a direction parallel to the polarizing direction of the laser light is smaller than half the oscillation wavelength of the semiconductor laser element, and the aperture width W2 in a direction perpendicular to the polarizing direction is larger than the aperture width W1.
Claims13
A semiconductor laser device, comprising:
- a semiconductor laser element having a light-emitting surface from which a laser light having a wavelength λ is emitted;
- and
- a light absorption film covering the light-emitting surface of said semiconductor laser element, the film having a slit for passing through the light emitted from the light-emitting surface, the slit having a first width W1 in a direction parallel to the polarizing direction of said laser light and a second width W2 in a direction perpendicular to the polarizing direction of the laser light;
- wherein the first width W1 is shorter than half the wavelength λ of semiconductor laser element and also is shorter than the second width W2.
A semiconductor laser device, comprising:
- a semiconductor laser having a light-emitting surface from which a polarized laser light is emitted;
- a protective film formed on the light-emitting surface of the semiconductor laser;
- and
- a metal film formed on the protective film and covering the light-emitting surface of said semiconductor laser, the metal film having an aperture for passing through the polarized laser light, the aperture having a first width W1 in a direction parallel to the polarizing direction of the laser light and a second width W2 in a direction perpendicular to the polarizing direction of the laser light;
- wherein the first width W1 is shorter than half the wavelength λ of the laser light and also is shorter than the second width W2.
Dependencies are inferred from the claim text.