A kind of composite thin film and its preparation method and self-starting mode-locked fiber laser device

Abstract

The application belongs to the technical field of fiber lasers, and in particular relates to a composite thin film, a preparation method thereof, and a self-starting mode-locked fiber laser device. Because the gain fiber doped with rare earth atoms is expensive, the cost of the fiber laser is also very high. At the same time, the long gain fiber will lead to extremely obvious Kelly sidebands of the mode-locked pulse, which will eventually cause the interaction between soliton pulses, resulting in The timing jitter of pulses aggravates the bit error rate of long-distance communication, which is not conducive to the improvement of communication quality. The application provides a composite film, which is composed of the following raw materials in parts by weight: 3-11 parts of polyvinylpyrrolidone, 16-24 parts of ethylene glycol, 76-84 parts of sodium hydroxide, 2-2 parts of bismuth chloride 10 parts, 1 to 9 parts of antimony chloride and 11 to 19 parts of sodium tellurite. It has weak Kelly sidebands, high damage resistance threshold, can realize self-starting mode locking, easy to operate, narrow pulse, and good stability.

Description

technical field [0001] The application belongs to the technical field of fiber lasers, and in particular relates to a composite thin film, a preparation method thereof, and a self-starting mode-locked fiber laser device. Background technique [0002] Fiber lasers have the advantages of small size, light weight, and easy integration. Using a fiber laser as a seed source for amplification can obtain high-power, stable laser pulses. It can be used in industrial cutting, laser marking, laser weapons, biological detection and other fields. [0003] Existing passively mode-locked fiber lasers are mainly realized by using two-dimensional materials as saturable absorbers. However, due to the low modulation depth of most materials and the need for a long gain fiber to achieve mode locking, the cost of the fiber laser is also very high due to the high cost of the gain fiber doped with rare earth atoms. The Li sidebands are extremely obvious, which will eventually cause the interact...

AI Technical Summary

Problems solved by technology

However, due to the low modulation depth of most materials and the need for a long gain fiber to achieve mode locking, the cost of the fiber laser is also very high due to the high cost of the gain fiber doped with rare earth atoms. Li sidebands are extremely obvious, which will eventually cause the interaction between soliton pulses, resulting in timing jitter of pulses, aggravating the bit error rate of long-distance communication, and not conducive to the improvement of communication quality

Images