Stable, narrow-linewidth optical sources are necessary in modern atomic physics. An appealing approach to achieving frequency stability is optical feedback. We have designed a compact external cavity diode laser with optical feedback to a filter cavity mounted on a single baseplate and enclosed inside a vacuum sealed box. The design was implemented for three wavelengths addressing the cooling, repumping, and clock transition lines of . We are able to cool a single, trapped strontium ion to and observe motional sidebands of the transition.
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