High-power fiber laser system based on compound-core multimode fiber

Period of Performance: 05/09/2000 - 11/09/2000

$65K

Phase 1 SBIR

Recipient Firm

Altair Center, LLC
1 Chartwell Circle
Shrewsbury, MA 01545
Principal Investigator

Abstract

Altair Center proposes to develop high-power fiber laser system based on a novel and innovative compound-core multimode active fiber capable to operate in a single-mode regime. The compound multimode core of the fiber is designed to support propagation of a higher order mode exhibiting a sharp peak of its field in the central region of the core. The sharp-peak mode extracts energy form the entire volume of the active fiber core and concentrates it in the core central region. The output sharp-peak beam is a well-collimated waveguide mode that can be easily focused and coupled into a standard single-mode fiber. The compound-core fiber has many unique properties including the ability to operate at several different wavelengths simultaneously, wavelength selective and filtering properties, regimes of high sensitivity of the central mode peak to the external perturbations of the fiber, etc. This suggests its numerous applications in active and passive fiber based devices and sensors.The possibility of fabricating the compound-core fiber has been already demonstrated in preliminary experiments. In Phase I project, we will optimize the technology and apply it to fabrication of active version of the fiber. A prototype high-power fiber laser system will be assembled and tested in Phase II. The proposed compound-core fiber is an excellent candidate as a product in several markets, including: fiber lasers, telecommunication, wireless optical communication, electronic printing, remote sensing and monitoring, industrial cutting and welding, parametric frequency conversion, sensors, medical applications, etc.