Intra-Cavity Holographic Gratings and Lasers with a Controllable Spectrum Based on Them

The comparison of the influence of intra-cavity spectral selectors: static Bragg gratings and dynamic gain gratings, has been presented. It has been shown that their effect on the spectral properties of the laser radiation with a loop resonator is similar. The performed statistical study of the mode composition of the groups of the generation pulses at the Q-factor modulation mode allows us to conclude that the rewriting of the grating by the subsequent group pulse does not prevent radiation at the same frequency. This opens up the possibility of frequency stabilization of the radiation. The presence of an intra-cavity Bragg grating causes an increase in the probability of preserving the radiation frequency in neighboring pulses of the radiation group. It has been shown that there is a narrowing of the pulse generation spectrum in the group, despite the fact that the spectral width of the grating exceeds the spectral width of the generation pulse. The combined operation of static and dynamic intra-cavity gratings makes it possible to create a line of lasers with high pulse energy, radiation quality close to the diffraction limit, high peak power, and a narrow radiation spectrum.