Coherent combining of fibre lasers

Coherent beam combining of active multicore optical fiber

“…Lasers of this type because of their distinctive properties, such as: high amplification, low excitation threshold, high efficiency, excellent quality of the laser beam and no necessity of cooling (except for extreme cases) are the subject of extensive research. Besides, the recent progress in that field resulted in applying them as one of the basic structures of solid-state lasers [1][2][3][4][5][6]. The ability to accumulate energy by the active medium depends on its volume and concentration of the active dopant.…”

Fibre lasers - conditioning constructional and technological

“…The radiation intensity and the beam divergence in such a case are changing proportionally to the number of emitters. If radiation generated in particular cores is mutually coherent (phased), then the farfield diffraction pattern of the laser beam consists of a central high-intensity and low-divergence peak and symmetrical side lobes with considerably lower radiation intensity [35,36]. The angular divergence of the central peak is reduced in proportion to the number of emitters (elements of the matrix) generating mutually coherent radiation.…”

The Design of a 2×1 Beam Combiner in Two-Dimension Photonic Crystal

“…They have been widely used in many research fields. For example, in high power laser research area, beam combiners are used to get high output power by synthesized multiple laser beams [1,2]. In astronomy and free space optical communication studies, beam combiners help people to gather the weak signals that are dispersed distribution, so the signal intensity and optical signal-to-noise ratio ( OSNR ) are enhanced [3,4].…”