DEVICE FOR SWITCHING MODES OF OPERATION OF FIBRE-OPTIC LASER AND METHOD FOR PRODUCTION THEREOF Russian patent published in 2019 - IPC H01S3/10 

FIELD: optics.

SUBSTANCE: invention relates to optical elements for fibre lasers, in particular to saturable absorbers. Summary of the invention is a device for switching modes of operation of a fibre-optic laser based on a controlled saturable absorber of carbon nanotubes, consisting of a substrate on which an electrode is placed, counter electrode, polished to core portion of optical fibre, connected by direct contact with electrode made in form of film of carbon nanotubes, wherein the polished part of the fibre, the film and the counter electrode are electrically connected to each other through the ionic liquid, and said film is configured to change nonlinear absorption at the wavelength of the laser when the potential difference is applied to the electrode and the counter electrode. To create the device, a method is proposed, which includes the following operations: obtaining a film of single-layer carbon nanotubes grown by chemical vapour deposition on catalyst particles passing in a gas stream through a hot zone of the furnace and forming said nanotubes deposited on a filter installed at the outlet of the furnace, wherein change of synthesis parameters is selected to diameter of nanotubes, providing maximum absorption for a given thickness of film at wavelength of laser, fixing on substrate optical fibre, part of which is polished to core, pressing by a direct contact of a film of carbon nanotubes to a flat surface of the polished fibre, a reference electrode and a counter electrode are placed side by side on the substrate, a film of carbon nanotubes is coated on a flat surface of the polished fibre with a drop of ionic liquid, so that the film, the reference electrode and the counter electrode are bound by the ionic liquid.

EFFECT: technical result of invention implementation consists in improvement of stability and range of possible modes.

7 cl, 6 dwg