US 2020/0287345 A1 · METHODS TO MAINTAIN AND CONTROL THE POLARIZATION STATE FROM 3C OPTICAL FIBER

Abstract

Fiber laser amplification systems and methods are disclosed for use with a chirally coupled core (3C) optical fiber enabling the generation of a high-power output beam having a controlled stable polarization state. Vector modulation instabilities which typically induce undesirable sidebands in 3C fiber optics are greatly reduced even at high peak powers, enabling operation of the up to power levels limited mainly by stimulated Raman scattering (SRS). Polarization extinction ratios (PER) demonstrate long-term stability and minimal degradation due to changes in system temperature. Delays in reaching stable operation during start-up are also greatly reduced.

Claims20

Dependent claims

An apparatus, comprising:

a 3C fiber wound a number of turns about a coiling axis between an input end and an output end of the 3C fiber to form a 3C fiber coil such that a number of twists in the 3C fiber with the input end and output end extended to form a straight fiber configuration is smaller than the number of turns, wherein the input end is situated to receive a beam with an input circular polarization state and the wound 3C fiber is configured to amplify the beam to produce an amplified output beam with an output circular polarization state and to reduce a polarization state variability of the output circular polarization state based on the smaller number of twists and the input circular polarization state.

Dependencies are inferred from the claim text.

Facts

Application

16/809,314Filed 4 Mar 2020

Priority

5 Mar 2019

Published

10 Sep 2020

Term ends

Not estimatedThe source records don’t support an estimate.

Classification11 codes

H01S 3/302
Using scattering effects, e.g. stimulated Brillouin or Raman effects: in an optical fibre
H01S 3/06712
Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering: polarising fibre; Polariser
H01S 3/06737
Peculiar transverse fibre profile: fibre having multiple non-coaxial cores, e.g. multiple active cores or separate cores for pump and gain
H01S 3/094003
By coherent light: the pumped medium being a fibre

Methods to maintain and control the polarization state from 3c optical fiber

Life of this patent

Methods to maintain and control the polarization state from 3c optical fiber

Life of this patent

Abstract

Claims20