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Injection locking is a well known and commonly used method for coherent lightamplification. Usually injection locking is done with a single-frequencyseeding beam. In this work we show that injection locking may also be achievedin the case of multi-frequency seeding beam when slave laser providessufficient frequency filtering. One relevant parameter turns out to be thefrequency detuning between the free running slave laser and each injectedfrequency component. Stable selective locking to a set of three componentsseparated of $1.2\,$GHz is obtained for (positive) detuning values between zeroand $1.5\,$GHz depending on seeding power (ranging from 10 to 150 microwatt).This result suggests that, using distinct slave lasers for each line, a set ofmutually coherent narrow-linewidth high-power radiation modes can be obtained.

Injection locking of a semiconductor laser to a multi-frequency reference beam