V. V. Antyukhov

Effective phase locking of an array of lasers

It is predicted theoretically and verified experimentally that an effective phase-locking of a two-dimensional array of lasers can be achieved by making use of the reproduction of the wave front of a periodic structure of coherent radiators.

Multibeam waveguide CO2 laser excited by an alternating-current discharge

We report the development of a multibeam laser, excited by an ac discharge in the frequency range approximately 10 to 70 kHz. The results are given of an investigation of the active medium and of the dependence of the output characteristics of such lasers on the discharge tube diameter, pressure in the gas mixture, and frequency of the pumping current.

Measurement of the phase difference between the output beams of two coupled CO 2 lasers

Measurements were made of the phase difference between the output beams of two coupled CO2 lasers operating in a coherent regime. The results of the experiments are in qualitative agreement with calculations performed on the basis of a point model of two coupled lasers, taking the gain dynamics into account. The dependencies of the phase difference on the mismatch of the resonator lengths and on the length of the coupling channel should be useful when constructing a phasematched set of lasers and an optical guidance system linked to it.

Output characteristics of a waveguide CO2 laser with plane mirrors

A study was made of the influence of misalignment of the plane mirrors of a waveguide CO2 laser on the output power and mode structure of the radiation. It was found that misalignment of the resonator only weakly affected the output power, but exerted a strong influence on the beam divergence and maximum radiation intensity in the far-field zone. A qualitative agreement was obtained between the experimental results and the proposed theoretical model.

Characteristics of coherent emission from two coupled CO2 lasers with different resonators

Experimental and numerical investigations were made of the stimulated emission regimes of two coupled CO2 lasers with different resonators. A difference between the resonator lengths amounting to λ /2 could give rise to two locking regions when a cophasal mode was emitted in one region and an antiphasal mode in another. A selective iteration method was used to find a range of parameters ensuring single-mode emission from the coupled lasers. The results of the calculations were in good agreement with the experiments.

Measurement of the phase difference between the output beams of two coupled CO2 lasers

Measurements were made of the phase difference between the output beams of two coupled CO2 lasers operating in a coherent regime. The results of the experiments are in qualitative agreement with calculations performed on the basis of a point model of two coupled lasers, taking the gain dynamics into account. The dependences of the phase difference on the mismatch of the resonator lengths and on the length of the coupling channel should be useful when constructing a phase-matched set of lasers and an optical guidance system linked to it.