Semiconductor saturable absorber mode locking device

Abstract

The invention relates to a semiconductor saturable absorber mode locking device, and the device comprises a shell with an inner cavity, a light spot focusing device is fixed in a first through hole in the left side of the shell in a sealed mode, a non-magnetic partition plate is fixed in a second through hole in the right side of the shell in a sealed mode, and therefore the inner cavity forms a sealed space. A first permanent magnet and a second permanent magnet are tightly attached to the left side and the right side of the non-magnetic partition plate respectively; the side, away from the non-magnetic partition plate, of the first permanent magnet is fixedly connected with a heat sink, and the side, away from the first permanent magnet, of the heat sink is fixedly connected with a semiconductor saturable absorber element. The side, away from the heat sink, of the semiconductor saturable absorber element is fixedly connected with a light-transmitting heat-conducting cover plate, and the first permanent magnet and the second permanent magnet achieve magnetic follow-up through magnetic adsorption. The semiconductor saturable absorber is prevented from being directly exposed in a laser focusing focal spot, a switchable point is two-dimensional and has no blind spot, the point switching operation is simple, the reliability of the device is improved, and the service life of the device is prolonged.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a semiconductor saturable absorber mode-locking device. Background technique [0002] In recent years, due to the further development of laser processing, laser sensing, optical fiber communication, quantum communication, biomedicine, laser detection, and scientific research, various lasers have been used more and more. The most well-known among the public is laser fine machining. In contemporary industrial production, which pays more and more attention to product yield and benefit, random failures of processing equipment will bring unacceptable losses to processing enterprises. As the core module of many precision processing equipment, ultrafast lasers have long-term stability and reliability as the basis for long-term stable work of ultrafast laser processing equipment. Among many ultrafast laser generation schemes, passive mode-locked fiber laser seed sources and solid-state ...

AI Technical Summary

Problems solved by technology

For the point change schemes of the first two patents, it is inevitable that the mechanical connection method will cause position jumps, so there is a risk that the mold cannot be locked smoothly; while the technical solution for the third invention patent application is efficient in point change, and each point can be fully guaranteed. The characteristics of life, but it sets multiple optical paths and realizes point change through multi-channel optical switch switching circuits, its cost increases with the number of points, the volume is getting bigger and bigger, and the control is getting more and more complicated

More importantly, the semiconductor saturable absorbers of the above three technical solutions are directly exposed to the focal spot of the laser focus, and the accumulated heat of long-term multi-pulse cannot be effectively conducted, which is easy to reduce the damage threshold. Once one or more points of damage occur , its material peeling will be scattered in the closed space, randomly polluting the materials in the cavity, including polluting the semiconductor saturable absorber itself, resulting in less and less significance for subsequent point replacement, and actually making the life of subsequent new points shorter and shorter. shorter

[0004] Therefore, the existing technology has a large room for improvement

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