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Future transportable optical clocks require compact and reliable lightsources. Here, broadband, unpolarized repumper and state clearout sources forSr+ single-ion optical clocks are reported. These turn-key devices require nofrequency stabilization nor external modulators. They are fiber based,inexpensive, and compact. Key characteristics for clock operation arepresented, including optical spectra, induced light shifts and requiredextinction ratios. Tests with an operating single-ion standard show a clearoutefficiency of 100%. Compared to a laser-based repumper, the achievablefluorescence rates for ion detection are a few tens of per cent lower. Theresulting ion kinetic temperature is 1--1.5 mK, near the Doppler limit of theion system. Similar repumper light sources could be made for Ca+ (866 nm) andBa+ (650 nm) using semiconductor gain media.

Broadband, unpolarized repumping and clearout light sources for Sr$^+$ single-ion clocks