Patent ID: 7508848

Claim:
A fiber-based pulse laser system, comprising: a laser amplification system configured to amplify an input laser pulse to produce an amplified laser pulse; and a fiber-based compressor configured to compress the amplified laser pulse to produce an compressed laser pulse, wherein the fiber-based compressor comprises an optical fiber that includes: a first end face configured to be optical coupled to the laser amplification system to allow the amplified laser pulse to enter the optical fiber; a second end face configured to allow the compressed laser pulse exits the optical fiber; an air core through the optical fiber, wherein the air core includes a first portion having a first opening at the first end face and a second portion having a second opening at the second end face, wherein the first portion is vacant, wherein the second portion is filled with a material comprising silicon; and a plurality of air holes substantially parallel to and surrounding the air core, wherein each of the plurality of air holes includes a third portion having a third opening at the first end face and a fourth portion having a fourth opening at the second end face, wherein the third portion is vacant, wherein the fourth portion is filled with the material comprising silicon, wherein the first portion in the air core is longer than the third portions in the air holes surrounding the air core.