{"product_id":"broad-area-laser-bars-for-1-kw-emission-von-matthias-m-karow","title":"Broad-Area Laser Bars for 1 kW-Emission","description":"\u003cp\u003eIndustrial laser systems for material processing applications rely on the availability of highly efficient, high-brightness diode lasers. GaAs-based broad-area laser bars play a vital role in such applications as pump sources for high-beam-quality solid-state lasers and, increasingly, as direct processing tools.\u003c\/p\u003e\u003cp\u003eThis work studies 940 nm-laser bars emitting 1 kW optical power at room temperature, identifying those physical mechanisms that are currently limiting electrical-to-optical conversion efficiency as well as lateral beam quality. In the process, several diagnostic studies on bars with varied lateral-longitudinal design were carried out. The effects of technological measures for performance optimization were analyzed, yielding a new benchmark in efficiency and lateral divergence.\u003c\/p\u003e\u003cp\u003eThe studies into altered resonator lengths of 4 and 6 mm as well as fill factors between 69 and 87 % successfully reduce both the voltage dropping across the device and power saturation at high currents, enabling 66 % efficiency at the operation point. Concrete measures how to reach efficiencies ¿70 % are presented thereafter, showing that doubling the efficiency value of the first 1 kW-demonstration in 2007 ¿ amounting to 35 % ¿ is in near reach.\u003c\/p\u003e\u003cp\u003eInvestigation of the beam quality bases on a herein proposed and realized concept, in which the far field is resolved for each individual bar emitter. In this way, it is possible to determine how far-field profiles vary along the bar width and how much these variations affect the overall bar far-field. Further, such effects specific to bar structures can be separated into non-thermal and thermal influences. The effect of mechanical chip deformation (bar smile) as well as neighboring-emitter interaction has been investigated for the first time in active kW-class devices, yielding a lateral divergence as low as 8.8° at the operation point.\u003c\/p\u003e\u003cdiv class=\"aw-variant-hidden-subtitle-div\" id=\"aw-variant-subtitle-9783736976269\"\u003e\u003ch3\u003eDemonstrating increased efficiency and narrowed far field\u003c\/h3\u003e\u003c\/div\u003e","brand":"Autorenwelt Shop","offers":[{"title":"Softcover - 9783736976269","offer_id":53768787722565,"sku":"9783736976269","price":47.4,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0622\/files\/e235a392-68ef-4503-8673-2109bbfe720f.jpg?v=1776495282","url":"https:\/\/shop.autorenwelt.de\/products\/broad-area-laser-bars-for-1-kw-emission-von-matthias-m-karow","provider":"Autorenwelt Shop","version":"1.0","type":"link"}