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The injection locking of a laser diode to FM sidebands of a second, modulated laser has been investigated. Locking to sidebands as far as 9.5 GHz removed from the fundamental lasing frequency was observed.
The centre of the locking frequency range of a GaAlAs laser is found to shift to longer wavelengths with increasing injected power by an amount proportional to the square root of the injected power level. These observations are in good agreement with predictions based on an analysis relating equilibrium photon and carrier densities in the laser cavity.
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