Preparation method for waterproof laser film

Abstract

The invention relates to a preparation method for a waterproof laser film. According to the requirement in practical application of normal incidence 800nm pumping transmission and back incidence 1064nm fundamental frequency light reflection, an HfO2 and SiO2 film is prepared by a vacuum electron beam evaporation sedimentation technology and is taken as the film which has a large electric filed and is easy to damage due to being close to a base plate when being used as the back incidence, so as to obtain higher laser damage resistance threshold; aiming at the working condition of a water cooling system, for the films close to the water side and easy to be permeated and corroded, Ta2O5 and SiO2 films are prepared by an ion beam auxiliary sedimentation technology, so that the microstructure of the film is improved, higher stacking density is obtained, and good waterproof performance is realized; HfO2, Ta2O5 and SiO2 of high or low refractive index are deposited alternately so as to form a multi-layer film, and the optical thickness of each layer is controlled so as to obtain the needed spectral characteristic. The preparation method can well take advantages of the three characteristics and can apply the characteristics to a neodymium glass substrate of a diode pumping solid laser system, so that the diode pumping solid laser system can work in a water cooing system normally, and has good laser damage resistance performance and the spectral characteristic needed by the system.

Description

technical field [0001] The invention relates to the field of laser thin films, in particular to a method for preparing a waterproof laser thin film capable of providing waterproofness for a neodymium glass substrate, and simultaneously having required spectral properties and a high resistance to laser damage threshold. Background technique [0002] Among the diode-pumped solid-state laser systems, it is a new type of laser with the fastest development and wide application in the world in recent years. In diode-pumped solid-state laser systems, the laser thin film on the surface of the optical element should have a high resistance to laser damage threshold. At the same time, the laser thin film coated on the gain medium neodymium glass needs to meet certain spectral requirements, that is, it has high transmittance to the pump light and high reflectivity to the fundamental frequency laser. However, as the pump power increases, it is necessary to water-cool the gain medium neo...

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Problems solved by technology

[0006] Since the current thin-film technology cannot work in a water environment, it can take into account a high laser damage threshold and good water resistance at the same time, and cannot protect the deliquescent neodymium glass substrate, making it difficult to apply the water-cooling system In a diode-pumped solid-state laser system

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