Stable, narrow-linewidth optical sources are necessary in modern atomic physics. An appealing approach to achieving $\sim 10\mathrm{kHz}$ 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 $422\mathrm{nm}$ cooling, $1091\mathrm{nm}$ repumping, and $674\mathrm{nm}$ clock transition lines of ${\mathrm{Sr}}^{+}$ . We are able to cool a single, trapped strontium ion to $\sim 2\mathrm{mK}$ and observe motional sidebands of the $5S_{1∕2}\leftrightarrow 4D_{5∕2}$ transition.

© 2007 Optical Society of America

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