Multiple-pass method and apparatus for laser amplification

Details Multiple-pass method and apparatus for laser amplification Multiple-pass method and apparatus for laser amplification

1993-02-17

1993-12-07

Hellner, Mark

Optical: systems and elements

Optical amplifier

Multiple pass

H01S 300

Patent

active

052687872

ABSTRACT:
A method and apparatus for increasing the energy extraction efficiency from laser amplifiers by passing a laser signal through the amplifier multiple times in a collinear geometry without need to use active optical switching components. The invention uses a non-reciprocal optical element which affects (e.g., rotates the polarization of) a light beam differently depending on which direction the beam passes through the optical element. In a preferred embodiment, the method and apparatus employs a Faraday rotator as the direction-dependent light beam rotating device.

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patent: 4941738 (1990-07-01), Olsson
patent: 5048030 (1991-09-01), Hiiro
patent: 5172263 (1992-12-01), Hale
Lowdermilk & Murray; The Multipass Amplifier: Theory And Numerical Analysis; May 1980; J. Appl. Phys. 51(5), pp. 2436-2444.
Murray & Lowdermilk; ND:YAG Regenerative Amplifier; Jul. 1980; J. Appl. Phys. 51(7); pp. 3548-3555.

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