Accession Number:

ADA422225

Title:

Fiber Laser Array

Descriptive Note:

Final rept. Feb 2002-Dec 2003

Corporate Author:

TITAN CORP SAN DIEGO CA

Personal Author(s):

Report Date:

2004-01-01

Pagination or Media Count:

76.0

Abstract:

Experiments have been conducted to investigate the feasibility and scalability of coherent laser output from an array of fiber lasers with strong intracavity coupling flexible reconfigorable experimental apparatus has been modified and configured for these investigations. Measurements taken with this apparatus during this program showed that without polarization selection. the lasers were likely to exhibit spectra that showed the effects of polarization mode dispersion. .Arrays of 2-5 amplifer elements coupling using the 2 x 2 fiber couplers were constructed with emphasis on a unidirectional ring configuration. A theoretical prediction that for a range of pump powers more power can be coherently coupled not of an any than is available at all outputs of an incoherently coupled array was verified experimentally. A novel pulsating behavior was observed over a range of operating conditions for the two-element array. An extensive series of runs was made where the overall cavity length or the lengths of individual element paths were varied over a wide range. Stable output from a four-laser array could only be observed when there was significant length mismatch between the array elements. Spectral features related to the mismatch in cavity length for the only elements were identified. A transition in the spectral characteristics indicated that cross coupling between optical modes was the first significant nonlinear optical interaction in the array. There appears to be a complex interplay between the spectral.

Subject Categories:

  • Lasers and Masers
  • Textiles
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE