The University of Arizona

Np Photonics, Inc.

Ewan Wright

Mahmoud Fallahi

Chris Hessenius

Shibin Jiang

Yushi Kaneda

Arturo Chavez-Pirson

Dan Trung Nguyen

Sergio Brito Mendes

Gualtiero Nunzi Conti

A collinear T-cavity VECSEL system generating intracavity Hermite-Gaussian modes at multiple wavelengths, configured to vary each of these wavelengths individually and independently. A mode converter element and/or an astigmatic mode converter is/are aligned intracavity to reversibly convert the Gaussian modes to HG modes to Laguerre-Gaussian modes, the latter forming the system output having any of the wavelengths provided by the spectrum resulting from nonlinear frequency-mixing intracavity (including generation of UV, visible, mid-IR light). The laser system delivers Watt-level output power in tunable high-order transverse mode distribution.

Generation of high-power spatially-restructurable spectrally-tunable beams in a multi-arm-cavity VECSEL-based laser system

Generation of high-power spatially-restructurable spectrally-tunable beams in a multi-arm-cavity vecsel-based laser system

A compact, low-cost mid-gain Erbium Micro-Fiber Amplifier (EMFA) is provided by multi-mode pumping a micro fiber formed from a specialty multi-component glass and highly co-doped with Er:Yb. The specialty glass exhibits a much higher core absorption coefficient than standard glasses. As a result, the lower order modes are rapidly absorbed in the fiber core. The abrupt change in the mode profile perturbs the higher order modes and mode couples them into the lower order modes within a very short length of fiber, less than 20 cm. This &ldquo;absorptive mode coupling&rdquo; effect can double the absorption efficiency of a circular symmetric micro fiber and extend the length over which such a highly doped fiber can be efficiently inverted. The combination of multi-mode pumping with short fiber lengths reduces the form factor and cost of EMFAs.

Multi-mode erbium micro fiber amplifier (EMFA)

Growing community of inventors

Tucson, AZ, United States of America

Ewan Wright