Laser with intracavity modulator

A method for generating radiation, the method comprising:

• inserting a gain medium configured to amplify laser radiation within a given gain band in a resonant optical cavity, the resonant optical cavity comprising a first reflector disposed on a first side of the gain medium and a second reflector disposed on a second side of the gain medium, opposite the first side;
• inserting in the resonant optical cavity a comb filter between the first and second reflectors, the comb filter being configured to pass a set of distinct wavelength sub-bands within the gain band, the set of distinct wavelength sub-bands defining a comb;
• inserting in the resonant optical cavity a plurality of optical ring resonators between the first and second reflectors in series with the comb filter, the optical ring resonators having tunable resonant wavelengths in proximity to different, respective wavelength sub-bands of the comb;
• and
• applying respective control voltages to the optical ring resonators so as to tune the respective resonant wavelengths relative to the respective wavelength sub-bands, thereby modulating the sub-bands in the laser radiation that is output from the device.