Resonant cavity grating unstressed packaging device and packaging method for fiber laser

Abstract

The invention discloses a resonant cavity grating stress-free packaging device and method for a fiber laser. The device is composed of a fiber tension meter, a tail fiber clamp module, a resonant cavity fiber grating, a grating packaging piece module, a three-dimensional adjusting frame, ultraviolet curing glue and an ultraviolet curing light source. According to the method, a traditional packaging technology of the fiber grating and a pre-stress tuning grating central wavelength technology are combined, a room-temperature curing type packaging adhesive is selected to eliminate packaging stress introduced by temperature in a traditional thermocuring process, and meanwhile, stress introduced by curing shrinkage of an ultraviolet adhesive is counteracted by accurately applying pre-stress to the grating and accurately controlling the adhesive amount; unstressed packaging of the resonant cavity grating is realized, and the wavelengths of the grating before and after packaging are consistent; and then active temperature control and heat insulation and vibration isolation packaging are carried out on the grating, so that the influence of spontaneous heating and external environment disturbance on the wavelength of the grating during working of the grating is further eliminated. The optical fiber laser can well meet the application requirement for high long-term stability of the center wavelength of the optical fiber laser in related scientific research fields and engineering application, and has the advantages of being high in reliability and good in process repeatability.

Description

technical field [0001] The invention relates to fiber grating packaging, in particular to a resonant cavity grating stress-free packaging device and packaging method for fiber lasers. Single-frequency fiber laser resonator packaging that can be applied to fiber optic hydrophones, coherent optical communications, gravitational wave detection and other fields. Background technique [0002] In recent years, single-frequency fiber laser technology has developed rapidly and has been widely used in fields such as fiber optic hydrophones, coherent optical communications, and gravitational wave detection. These application fields have high requirements on the reliability, wavelength stability and noise characteristics of fiber lasers. The laser resonator grating in a general fiber laser is very sensitive to environmental disturbances, especially the most common effects of temperature and stress. The small stress introduced by temperature changes or packaging acts on the resonator g...

AI Technical Summary

Problems solved by technology

The disadvantage is that the central wavelength and temperature coefficient of the grating are adjusted by manually rotating or sliding the sleeve with the locking nut. The adjustment accuracy is not high, and repeated adjustments are often required to achieve the target parameters, and the process repeatability is not good.

If this packaging technology is applied to package fiber gratings for fiber lasers, it still cannot eliminate the wavelength drift caused by the fiber gratings’ self-heating, and the prestress introduced by the packaging continues to exist and the creep of the packaging glue will greatly affect the fiber laser. long-term wavelength stability

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