17 February 2010 High-brightness emission from stripe-array broad area diode lasers operated in off-axis external cavities
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Abstract
Phase-coupled stripe-array diode lasers show a strong double-lobed far-field because adjacent stripes tend to operate in the anti-phase supermode. One way to achieve a stable phase relationship and global coupling of the emitters of such a stripe-array is off-axis feedback. In this work several off-axis external cavity designs are discussed. A 400 μm wide emitter stripe array consisting of 40 stripes with a pitch of 10 μm was investigated. By operating this device in a Littrow type off-axis external cavity, more than 2 W of output power of near diffraction-limited, single longitudinal mode emission with a brightness as high as 88 MW/cm2-str could be achieved. The technique of off-axis feedback was also adapted to realize spectral beam combining of 25 emitters of a laser bar. The experimental data are compared with numerical simulations using a new theoretical model including feedback.
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Andreas Jechow, Andreas Jechow, Danilo Skoczowsky, Danilo Skoczowsky, Mark Lichtner, Mark Lichtner, Mindaugas Radziunas, Mindaugas Radziunas, Ralf Menzel, Ralf Menzel, "High-brightness emission from stripe-array broad area diode lasers operated in off-axis external cavities", Proc. SPIE 7583, High-Power Diode Laser Technology and Applications VIII, 758312 (17 February 2010); doi: 10.1117/12.843047; https://doi.org/10.1117/12.843047
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