Thulium-doped microsphere cavity laser and preparation method thereof

Abstract

The invention discloses a thulium-doped microsphere cavity laser and a preparation method thereof, and belongs to the micro-optical device technical field. The thulium-doped microsphere cavity laser is composed of a thulium ion-doped microsphere coupling tapered optical fiber; an 808 nm laser is adopted as a pump light source; the tapered optical fiber is adopted to couple thulium-doped microspheres; and 2-micron laser can be outputted from the other end of the tapered optical fiber. A sol-gel method is adopted to prepare a thulium ion-containing solution; a carbon dioxide laser is adopted toheat the tail end of a communication optical fiber coated with the solution, and therefore, a thulium ion-doped carbon dioxide microsphere can be prepared; a heating and stretching method is adopted to obtain a tapered optical fiber by means of a ceramic heater, the diameter of the tapered region of the tapered optical fiber ranges from 1 micron to 5 microns; the microsphere is coupled to the tapered optical fiber under the control of a three-dimensional platform, so that a microsphere laser which is capable of stably outputting 2-micron band laser, with an 808 nm laser adopted as a pump source, a microsphere adopted a resonant cavity, and thulium ions adopted as a working substance, can be obtained. Since the commercially available 808 nm laser is adopted as the pump light source, the practical value of the thulium-doped microsphere cavity laser of the invention can be greatly improved. The thulium-doped microsphere cavity laser has the advantages of simple fabrication, low threshold,miniaturization and stable output.

Description

technical field [0001] The invention belongs to the technical field of micro-optical devices, and in particular relates to a thulium-doped microsphere cavity laser and a preparation method thereof. Background technique [0002] The invention of the laser is a major achievement of science and technology in the 20th century. Its theoretical basis is the concept of stimulated radiation proposed by Einstein in 1916. The theory points out that when the energy of the external radiation photon is just equal to the energy between the excited state and the low-energy state or the ground state of the luminescent atom in the excited state, the luminescent atom in the excited state will move to the low-energy state or the ground state under the action of the external radiation field. The frequency, phase, direction of propagation, and polarization state of the photons radiated during the transition are exactly the same as those of the extrinsic radiation photons. The light output by t...

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Problems solved by technology

However, the laser performance of semiconductor lasers is greatly affected by temperature, and the divergence angle of the beam is large, so it is not ideal in terms of directionality, monochromaticity and coherence.

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