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Small Business Innovation Research/Small Business Tech Transfer

Monolithic Rare Earth Doped PTR Glass Laser

Completed Technology Project

Project Description

Monolithic Rare Earth Doped PTR Glass Laser
Development of airborne and spaceborne laser systems dictates a number of extremely challenging requirements for such fine optical devices. These requirements include minimizing weight and volume, increasing of power and brightness, high tolerance to mechanical and acoustic vibrations and ionizing radiation. Solid state lasers provide the best parameters which are necessary for free space optical communications, remote sensing, etc. However, all such lasers require fine alignment and, therefore, are very sensitive to vibrations, thermal gradients, etc. The ideal situation would be if all elements of a laser would be incorporated in the volume of a gain medium. We propose a completely new approach to the problem. Researchers at CREOL have demonstrated that it is possible to produce co-doping of a photo-thermo-refractive (PTR) glass with Nd. It was found that absorption and luminescence properties of Nd in PTR glass are the same as for all silicate glasses. It is important that this type of silicate glass can be successfully doped with all rare earth ions, e.g. with Nd, Yb, Er, Tm, etc. At the same time, it was shown that PTR glass keeps it photosensitivity. This means that it is possible to record volume holograms in this material. A combination of good lasing properties and phase photosensitivity enables a new approach to all-solid-state laser. It became possible to record volume Bragg gratings in the volume of laser glass. In this case, all alignment will be done in the process of recording and no misalignment is possible in any conditions of exploitation. Thus, the proposed approach enables creation of a monolithic solid state laser. We expect to study luminescence properties and develop a technology of recording Bragg mirrors in the volume of gain medium and demonstrate diode pumped lasing in Phase I project. In the case of success, we expect to study semiconductor crystals precipitation in PTR glass and demonstrate a monolithic pulsed laser in Phase II project. More »

Anticipated Benefits

Primary U.S. Work Locations and Key Partners

Technology Transitions

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This is a historic project that was completed before the creation of TechPort on October 1, 2012. Available data has been included. This record may contain less data than currently active projects.