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Injection-locking of violet laser diodes with a 3.2GHz offset frequency for driving Raman transitions in 43Ca+
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Injection-locking of violet laser diodes with a 3.2GHz offset frequency for driving Raman transitions in 43Ca+
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Two cw single-mode violet (397nm) diode lasers are locked to a single external-cavity master diode laser by optical injection locking. A double-pass 1.6GHz acousto-optic modulator is used to provide a 3.2GHz offset frequency between the two slave lasers. We achieve up to 20mW usable output in each slave beam, with as little as 25 \mu W of injection power at room temperature. An optical heterodyne measurement of the beat note between the two slave beams gives a linewidth of <=10Hz at 3.2GHz. We also estimate the free-running linewidth of the master laser to be approximately 3MHz, by optical heterodyning with a similar device.
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