Abstract
A novel method is described for fast frequency modulation or frequency control of diode lasers which avoids problems associated with bias current modulation, namely amplitude modulation and thermal phase delays. The method is based on amplitude modulated, non-interfering control light with a wavelength near the transparency region of the laser diode, which specifically modifies the spectral gain profile yielding a constant gain but a controllable refractive index at the lasing wavelength. A phase-lock between the emission of two extended cavity diode lasers which could not be achieved using bias current modulation was realized using this method. Additionally this method allows for a realization of different special modulation types for laser diodes: amplitude- modulation-free frequency modulation, frequency-modulation- free amplitude modulation or single sideband modulation at modulation frequencies up to the relaxation oscillation frequency.
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