ELECTRONICALLY TUNABLE LASER USING WAVELENGTH SELECTIVE REFLECTORS

摘要

A laser cavity for generating a train of laser pulses at a selected wavelength comprises a gain medium (100); an input pulse generator for gating on an effective gain of the cavity, the generator generating pairs of pulses with a time tsel between the pulses and a time T between the pairs of pulses; a first and a second set of distributed wavelength selective reflectors (101,102) on each side of the gain medium (100), each of the reflections being spaced apart in time; the second (102) set being paired with the first set (101) wherein the pairing ensures that a total cavity round-trip delay of T is equal for all wavelengths; a delay modifier for adjusting the time tsel between the pulses and selecting a wavelength; and an output; whereby the output repetition rate of the train of laser pulses can be equal for all wavelengths reflected by the first and second sets.