Droplet whispering gallery mode laser and manufacturing method thereof

Abstract

The invention provides a droplet whispering gallery mode laser and a manufacturing method thereof. The first single-mode fiber with a tapered area in the middle is connected to the pump light source and the spectrometer respectively, and the second single-mode fiber is respectively connected to the capture light source and the ring-core fiber. The laser beam is injected into the core of the ring-core fiber through the second single-mode fiber, and the light is totally reflected and refracted at the inclined surface of the ring-core fiber's frustum-shaped fiber tip, and a ring-shaped converging light field is formed near the cone-shaped fiber tip to realize the function of optical tweezers , the optical tweezers stably capture the micro-droplets, and the captured liquid crystal micro-droplets are brought close to the taper of the first single-mode fiber, the pump light source is injected from the front end of the first single-mode fiber, and the spectrometer is detected at the rear end of the first single-mode fiber excited laser. In the present invention, a high-Q droplet microsphere cavity with a perfect surface is formed by surface tension, and the optical tweezers stably control the droplet microsphere, and the droplet whispering gallery mode laser has an extremely low threshold.

Description

technical field [0001] The invention relates to a laser, belonging to a micro-optical device. Specifically, it is a whispering gallery mode laser that captures liquid droplets with ring-core fiber optical tweezers. The invention also relates to a method for preparing a laser. Background technique [0002] Laser light sources play an important role in the field of modern optical communication. In order to improve thermal stability and save energy, it is necessary to produce low-threshold lasers in the infrared communication band. The microsphere cavity can confine the optical field in a very small area of ​​micron or submicron level, and select one or some special optical modes, thereby increasing the density of states of the cavity resonance mode. At the same time, the microcavity itself has a very high Q value and a small mode volume. When used as a laser resonator, it can effectively reduce the threshold of the laser, generate high optical field intensity, and have a lon...

AI Technical Summary

Problems solved by technology

At present, the liquid droplet microsphere laser scheme cannot control the liquid droplet stably, and cannot output the laser stably, and the solid microsphere cavity has small fluctuations on the surface that cause loss, the manufacturing process is complex, and it is difficult to manufacture solid state microspheres with small diameters and high Q values. question

Although solid-state microdisks and micropillar cavities have smaller sizes, there are problems such as high requirements for the direction of incident light and imperfect surfaces.

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