Optical transmission device, solid state laser device, and laser

Details Optical transmission device, solid state laser device, and laser Optical transmission device, solid state laser device, and laser

1996-09-18

1998-09-29

Healy, Brian

Optical waveguides

Optical fiber waveguide with cladding

With graded index core or cladding

385123, 385 31, 385 33, 385 38, G02B 602

Patent

active

058156267

ABSTRACT:
An optical transmission device has an graded index optical fiber having a diameter .phi..sub.s of a core of the optical fiber, a refraction index n.sub.0 at a center of the core, and a difference .DELTA.n between refraction indexes of the center of the core and a peripheral section of the core; and an optical fiber incident system having a smallest focussed point at or near an incident side plane in said optical fiber through which the laser beam being introduced, and a diameter .phi..sub.in Of the laser beam at said incident side plane of said optical fiber having a following relationship: 0.5.phi..sub.s .ltoreq..phi..sub.in .ltoreq.2.phi..sub.s, and .phi..sub.s =(.phi..sub.c .phi..sub.0 .theta.(2n.sub.0 .DELTA.n).sup.-1/2).sup.1/2, where a diameter and an opening angle of the laser beam waist are .phi..sub.0 and 2.theta.. A solid state laser device has an graded index optical fiber in which the diameter .phi..sub.in of the laser beam at the optical fiber side having the following relationship: 0.5.phi..sub.s .ltoreq..phi..sub.in .ltoreq.2.phi..sub.s, and .phi..sub.s =(.phi..sub.c .phi..sub.0 .theta.(2n.sub.0 .DELTA.n).sup.-1/2).sup.1/2, where a diameter of the laser beam waist at an output level is .phi..sub.0, and an opening angle is 2.theta. (total angle). and a laser processing device incorporating these optical transmission device and the solid state laser device.

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