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We report a compact extended-cavity diode laser producing, directly, 30 mW of near diffraction limited circular output. A laser diode with an integrated microlens is mounted in the Littrow geometry giving 5 GHz of continuous and 5 nm discontinuous tuning around 780 nm. The beat note linewidth of two similar lasers is measured to be 300 kHz. Laser cooling and trapping of rubidium has been performed with this laser geometry.
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Lancaster et al. (2000) studied this question.
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