Micro-ring reflection structure for external cavity narrow linewidth laser and preparation method of micro-ring reflection structure

Abstract

The invention discloses a micro-ring reflection structure for an external cavity narrow linewidth laser, and the structure comprises a micro-ring waveguide which comprises an annular body, and the annular body is provided with a reflection part in an integrated manner; and a straight waveguide provided outside the micro-ring waveguide so that a predetermined laser beam having a predetermined wavelength among the input laser beams transmitted in the straight waveguide is coupled into the micro-ring waveguide at a location where the straight waveguide is closest to the micro-ring waveguide and transmitted to the reflection portion, a portion of the predetermined laser beam being transmitted from the reflection portion to become a transmitted laser beam, the transmission laser continues to be propagated in the micro-ring waveguide in the original direction, is coupled back to the straight waveguide and is output from the straight waveguide in the direction the same as the direction in which the input laser is input into the straight waveguide. The reflected laser is reflected in the micro-ring waveguide, propagates in the opposite direction, is coupled back to the straight waveguide, and is output from the straight waveguide in the direction opposite to the direction in which the input laser is input into the straight waveguide so as to narrow the laser line width.

Description

technical field [0001] The invention relates to the field of optoelectronics, in particular to a micro-ring reflection structure and a preparation method for an external cavity narrow linewidth laser. Background technique [0002] With the development of science and technology, ultra-narrow linewidth lasers are widely in demand, and have applications in high-performance coherent communication, high-resolution optical sensing, high-resolution spectrometers, and quantum information science. [0003] Although, current commercial solid-state lasers and fiber lasers exhibit high performance and narrow linewidths, these devices usually consist of discrete components with large dimensions, which is a challenge for integration with other on-chip optical microsystems. Therefore, considering key operating parameters such as size, weight, and power, chip-scale semiconductor lasers are a more favorable choice. However, since the inherent linewidth of semiconductor lasers is ultimately ...

AI Technical Summary

Problems solved by technology

However, the microring-based external-cavity narrow-linewidth lasers in the above-mentioned prior art usually have problems such as large input-output coupling loss, which is not conducive to narrowing the laser linewidth, complex structure, and large volume.

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