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Stable laser sources at 461 nm are important for optical cooling of strontiumatoms. In most existing experiments this wavelength is obtained by frequencydoubling infrared lasers, since blue laser diodes either have low power orlarge emission bandwidths. Here, we show that injecting less than 10 mW ofmonomode laser radiation into a blue multimode 500 mW high power laser diode iscapable of slaving at least 50% of the power to the desired frequency. Weverify the emission bandwidth reduction by saturation spectroscopy on astrontium gas cell and by direct beating of the slave with the master laser. Wealso demonstrate that the laser can efficiently be used within the Zeemanslower for optical cooling of a strontium atomic beam.

Injection locking of a low cost high power laser diode at 461 nm