Package Structure of Distributed Feedback Fiber Laser

Abstract

The invention discloses a packaging structure of a distributed feedback fiber laser. The packaging structure is characterized by comprising a quartz U-shaped groove and silicone grease or silicone oil with which the quartz U-shaped groove is filled, an active phase shift fiber bragg grating is immersed in the silicone grease or silicone oil in the quartz U-shaped groove, tail fibers at the two ends of the active phase shift fiber bragg grating are fixedly bonded to the quartz U-shaped groove through two pieces of parallel thermocuring glue respectively to enable the active phase shift fiber bragg grating to be kept in the free state under the condition that axial stress is not borne, the grating tail fibers located outside the quartz U-shaped groove are sleeved with plastic sleeves respectively, the two ends of the quartz U-shaped groove and the plastic sleeves on the two sides are jointly inserted into corresponding hot melting pipes respectively, the two hot melting pipes and the quartz U-shaped groove are integrally inserted into a heat shrink pipe, the two hot melting pipes and the heat shrink pipe are heated to be shrunk to enable the two plastic sleeves and the quartz U-shaped groove to be connected into a whole, and meanwhile the heat shrink pipe is shrunk to enable the silicone grease or silicone oil to be sealed in the quartz U-shaped groove.

Description

technical field [0001] The invention relates to a packaging of a distributed feedback fiber laser gain medium and a resonant cavity, in particular to an active phase-shifting fiber grating packaging structure. Background technique [0002] Distributed feedback fiber laser is a typical narrow-linewidth fiber laser. It uses a single active phase-shifting fiber grating as the laser resonator and gain medium. It has extremely narrow linewidth, extremely low noise and stable single longitudinal mode. advantages such as operation. Due to the slender structure and single-frequency output characteristics of the distributed feedback fiber laser, it is extremely sensitive to environmental noise such as external vibration and sound. Weak sound waves or vibrations will cause obvious changes in frequency and phase, so it is often Used as fiber optic hydrophones and microseismic sensors. When used as a laser light source, the distributed feedback fiber laser without isolation protection...

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Problems solved by technology

Patent CN102035125.A designed a distributed feedback fiber laser packaging structure using sound insulation boards and steel wire rope shock absorbers, which can realize the functions of sound insulation, vibration isolation, temperature control and high frequency modulation, but in fact active phase-shifting optical fiber The pulling of the grating pigtail will also produce a more direct axial disturbance to the laser cavity. This factor has a more serious impact on the laser stability than the impact of vibration and sound waves. It is not considered here

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