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Tunable laser sources in the 2-4 ??m spectral range are required for several Air Force sensor applications, yet choices are few in that spectral region, and no truly satisfactory source has yet been found for all applications. Additional source alternatives are needed in addition to the existing rare-earth lasers and non-linear optical sources. Chromiumdoped II-VI (Cr2+:II-VI) materials, a new and relatively undeveloped class of laser material, have the promise of tuning over most of the 2-4 ??m region, but are susceptible to thermal effects and have other issues that make demonstration of sources with sufficient output power difficult. The output power of the Cr2+:II-VI laser needs to be scaled up to meet military application requirements. This dissertation investigates the feasibility of using Cr2+:II-VI laser materials to produce a laser with enough output power to be useful in military sensor applications. This dissertation surveys Cr2+:II-VI material properties and potential laser designs to assess power scaling feasibility, verifies feasibility with a laser demonstration, and then characterizes the thermal effects in the working laser material to help evaluate its effectiveness. The results of the survey show that the Cr2+:II-VI laser materials (such as Cr2+:ZnSe, Cr2+:CdSe, and Cr2+:CdMnTe) are especially susceptible to overheating and thermally-induced optical distortion, but otherwise are quite satisfactory laser materials. Cr2+:ZnSe is the most promising, due to its high thermal conductivity and relatively high maximum Cr2+ doping concentration. A face-cooled disk laser design using Cr2+:ZnSe looks most feasible for efficient power scaling at the power levels useful for sensor applications, as it produces high efficiency but low thermal distortion without requiring inordinate amounts of input power.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
