Manufacturing method of low-cost echo wall microcavity laser based on erbium-doped microspheres

Abstract

A manufacturing method of a low-cost echo wall microcavity laser based on erbium-doped microspheres comprises the following steps: pre-blending an erbium trichloride hexahydrate solution; using an alcohol lamp for heating to draw a single-mode optical fiber into a conical optical fiber until the conical optical fiber is broken, immersing the tip of the conical optical fiber in an erbium ion solution for several seconds, and using a fusion splicer for slightly discharging the tip to make the tip of the optical fiber changed into a microsphere through discharging of the fusion splicer due to heating melting and the surface tension effect, wherein water is evaporated due to instantaneous heating, erbium nitrate is crystallized and then is molten into microspheres together with silicon dioxide, and when the electric quantity is proper, erbium ions can be attached to the surfaces of the microspheres; and enabling a tapered optical fiber to be close to the surface of an erbium-doped microsphere, coupling evanescent waves on the surface of the tapered optical fiber into a microcavity to excite an echo wall mode, and enabling a light field and a gain medium to act to generate laser. The manufacturing method of the erbium-doped microsphere micro-cavity laser is simple and convenient to prepare and low in cost, and the manufactured erbium-doped microsphere micro-cavity laser has the characteristics of miniaturization, low threshold value, tunability and the like, and has wide application prospects in the fields of optical communication and sensing.

Description

technical field [0001] The invention provides a manufacturing method of a low-cost whispering gallery microcavity laser based on erbium-doped microspheres, and mainly relates to a manufacturing method of erbium-doped microspheres. Background technique [0002] Whispering gallery mode resonators have the characteristics of high quality factor, small mode volume, and long photon lifetime, and are used in high-sensitivity sensors, narrow-band filters, micro-lasers and other fields. In many microlaser configurations, microdroplets and solid spheres are used for cavity enhancement and laser manipulation. Microdroplet lasers are based on liquid, which is very suitable for the biological field. Typically, droplets need to be doped with electrokinetic trapping dyes, ultrasonic trapping dyes, or dyes supported on superhydrophobic surfaces. The complexity of the device and the non-reusable nature of the droplets limit their applications. In contrast, solid-state sphere lasers are r...

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Problems solved by technology

This method is relatively expensive due to the higher cost of using erbium-doped fiber and the potential safety hazards of using hydrofluoric acid

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