Laser beam scanner and its fabricating method

Details Laser beam scanner and its fabricating method Laser beam scanner and its fabricating method

1988-11-10

1990-09-18

Arnold, Bruce Y.

350 372, 350 383, G02B 532, G02B 2610

Patent

active

049573365

ABSTRACT:
A high precision laser beam scanner is provided which is able to shape a beam generated by a laser, suppress the influence of jitter of a scanning beam due to mode hopping of a semiconductor laser, and reduce aberration of the scanning beam. A beam source generates a semiconductor laser beam, which is diffracted by a rotary hologram, forming a scanning beam on a surface to be scanned. An aberration correcting stationary hologram is disposed between the beam source and the rotary hologram. The stationary hologram is constructed with an object wave and a reference wave, which interfere on a stationary hologram substrate subject so that an aberration of the scanning beam on the surface to be scanned shall be corrected. The object wave is a spherical wave which has an aberration, a wave length shorter than that of the semiconductor laser beam, and an incident angle which is not vertical but is inclined with respect to the stationary hologram substrate. A method for fabricating the laser beam scanner is also provided.

REFERENCES:
patent: 4364627 (1982-12-01), Haines
patent: 4378142 (1983-03-01), Ono
patent: 4428643 (1984-01-01), Kay
patent: 4429946 (1984-02-01), Haines
Dickson, "Aberrant Holographic Focusing Element for Post-Objective Holographic Deflector," IBM Technical Disclosure Bulletin, vol. 26, No. 12, May 1984, 6687.
Dickson, "Correction of Astigmatism for Off-Axis Reconstruction Beam Holographic Deflector," IBM Technical Disclosure Bulletin, vol. 23, No. 9, Feb. 1981, 4255.
Sincerbox, "Chromatic Correction for a Laser Diode/Holographic Deflector," IBM Technical Disclosure Bulletin, vol. 27, No. 5, Oct. 1984, 2892.
"Dual-Purpose Holographic Optical Element for a Scanner," IBM Technical Disclosure Bulletin, vol. 29, No. 7, Dec. 1986, 2892.

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