We report efficient, diode-pumped, self-frequency doubling (SFD) in the newly developed laser crystal Nd3+:YCa4O(BO3)3. More than 350 mW of fundamental output power at 1060 nm was achieved with a slope efficiency of 51%. With one watt of absorbed pump power, 62 mW of green cw laser emission at 530 nm was observed with proper phase matching. This initial performance, and the good optical properties of the crystalline host, are encouraging for the development of a high power diode-pumped SFD visible light laser source.
The status of our coherently combined 7-element, high power fiber array will be presented. A description of the architecture, the method of phase correction and a presentation of the results obtained to date will be presented. Details of our recent demonstration of a 155 W, polarization-maintaining fiber amplifier will be presented. This effort represents the results of a multi-year effort to achieve high power for a single element fiber amplifier and to understand the important issues involved in coherently combining many individual elements to obtain weapons class optical power for directed energy weapons. We will also discuss our vision on the next steps for this technology.
MA4
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