Liquid drop whispering gallery mode laser and manufacturing method thereof

Abstract

The invention provides a liquid drop whispering gallery mode laser and a manufacturing method thereof. According to the liquid drop whispering gallery mode laser, a first single-mode optical fiber with the middle being provided with a cone area is connected with a pump light source and a spectrograph, a second single-mode optical fiber is connected to a trapping light source and an annular core optical fiber, the front end of the annular core optical fiber is processed into a cone frustum shaped optical fiber tip, a laser beam emitted by the trapping light source is injected into a fiber core of the annular core optical fiber through the second single-mode optical fiber, total reflection and refraction occur in light at an inclined plane of the cone frustum shaped optical fiber tip of the annular core optical fiber, an annular convergence optical field is formed near the cone frustum shaped optical fiber tip so as to realize an optical tweezers function, the optical tweezers stably capture a micro liquid drop, the captured liquid crystal micro liquid drop is enabled to be close to the cone area of the first single-mode optical fiber, the pump light source injects from the front end of the first single-mode optical fiber, and the spectrograph detects excited laser light at the rear end of the first single-mode optical fiber. According to the invention, a high Q-value liquid drop micro spherical cavity with a perfect surface is formed by surface tension, and the optical tweezers stably control the liquid drop micro-sphere. The liquid drop whispering gallery mode laser provided by the invention 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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