Time division multiplexing coated lens for laser operation

Abstract

The utility model discloses a time division multiplexing coated lens for laser surgery, which comprises a substrate lens and a film material layer, the film material layer is fixed on the substrate lens, the film material layer is provided with at least two kinds of film materials, including a high refractive index film and a low refractive index film, the high refractive index film and the low refractive index film form an irregular film system, particularly an anti-reflection film system, and the film material layer is provided with at least two kinds of film materials. According to the utility model, the K9 glass is used as the substrate, the H4 and MgF2 film material combination is selected and used, and an anti-reflection film system which simultaneously plays an anti-reflection role in visible light wave bands of 400-700 nm and three near-infrared laser wavelengths of 980 nm, 1064 nm and 1470 nm is designed, so that the light energy efficiency and the signal-to-noise ratio of an optical system are effectively improved; in the laser operation process, laser sources with multiple wavelengths can be switched and used, and real-time imaging and monitoring can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of coated lenses, in particular to a time division multiplexing coated lens for laser surgery. BACKGROUND

[0002] In the laser surgery in vivo, with the aid of the visible light imaging system, the medical staff can directly observe the treatment area and the operation process in the operation process, so as to realize accurate lesion positioning and visual operation, so as to ensure that the patient receives accurate, safe and efficient treatment. Compared with the laser in the visible light band, the near-infrared laser has the characteristics of strong penetration and small injury, and the commonly used near-infrared laser wavelength is 980nm, 1064nm and 1470nm. These three near-infrared laser wavelengths have advantages and disadvantages, and when used alone, the treatment effect is poor, and they are independent systems. In order to simultaneously meet the visible light imaging and multi-wavelength laser surgery, this research adopts the strategy of time division multiplexing, integrates the above three lasers of different wavelengths into the imaging window lens of visible light, which can simultaneously output according to a certain proportion, or can be switched for use, realizing complementary functions, and also realizing time division imaging. While ensuring accurate cutting, ablation and other treatment functions, it also has good hemostatic effect, which can greatly reduce the surgical injury and reduce the pain of patients.

[0003] In order to realize this demand, it is necessary to develop an antireflection film which can cover the visible light 400nm~700nm band and the three near-infrared laser bands of 980nm, 1064nm and 1470nm, so that the antireflection film involves more band ranges, has higher integration, and has higher comprehensive indexes of bandwidth and transmittance, and has stronger pertinence and higher application value in the field of laser medical treatment. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a time division multiplexing coated lens for laser surgery, taking K9 glass as the substrate, selecting H4 and MgF2 as the film material combination, designing an antireflection film system which simultaneously has the function of increasing transmittance at the visible light 400nm~700nm band and the three near-infrared laser wavelengths of 980nm, 1064nm and 1470nm, effectively improving the light energy efficiency and signal-to-noise ratio of the optical system, and meeting the use requirements of time division multiplexing in the optical system such as laser medical treatment, that is, allowing multiple wavelength laser sources to be switched for use during the laser surgery process, and realizing real-time imaging and monitoring.

[0005] The utility model provides the following technical scheme: a time division multiplexing coated lens for laser surgery, comprising a substrate lens and a film material layer, the film material layer is fixed on the substrate lens, the film material layer has two kinds of film materials, including high refractive index film and low refractive index film, the thickness of each layer of the high refractive index film and low refractive index film is different, and a non-regular film system is formed, and the high refractive index film and low refractive index film are distributed in an upper and lower interval.

[0006] Further, the high refractive index film has 12 layers, and the low refractive index film also has 12 layers.

[0007] Further, the film material of the high refractive index film is H4, and the film material of the low refractive index film is MgF2.

[0008] Further, the thickest single layer of H4 is 124.6 nm, the thinnest single layer of H4 is 10.56 nm, and the total thickness of H4 is 527.18 nm.

[0009] Further, the thickest single layer of MgF2 is 116.52 nm, the thinnest single layer of MgF2 is 8.48 nm, and the total thickness of MgF2 is 604.41 nm.

[0010] Further, the material of the high refractive index film is any one of TiO2, ZrO2, Al2O3, Ta2O5 and Nb2O5, and the material of the low refractive index film is any one of SiO2, SiO and fluorides MgF2, BaF2, CaF2 and Na3AlF6.

[0011] Further, the base lens is a K9 glass base.

[0012] Compared with the prior art, the plated lens of the present application has the following advantages: K9 glass is used as the base, H4 and MgF2 are selected as the film materials, the distribution of the film materials is optimized, the plated lens can play a role in increasing the transmittance in the visible light 400nm-700nm wave band and three near-infrared laser wavelengths 980nm, 1064nm and 1470nm, the transmittance is more than 98%, the optical energy efficiency and the signal-to-noise ratio of the optical system are effectively improved, and the use requirement of time-division multiplexing in the optical system such as laser medical treatment can be met, that is, multiple wavelength laser sources can be switched and used during the laser surgery process, and real-time imaging and monitoring can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0013] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with embodiments of the present application, and do not constitute a limitation on the present application. In the drawings:

[0014] Figure 1 is a structure diagram of the plated lens of the present application;

[0015] Figure 2 is a structure diagram of the existing regular film system lens;

[0016] In the drawings: 1, base lens; 2, film material layer; 21, high refractive index film; 22, low refractive index film. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0018] Embodiment

[0019] Please refer to Figure 1 The present application provides a technical solution: a time-division multiplexing coated lens for laser surgery, comprising a base lens 1 and a film layer 2, the film layer 2 is fixed on the base lens 1. In this embodiment, the film layer 2 comprises a high refractive index film 21 and a low refractive index film 22, the thickness of each film of the high refractive index film 21 and the low refractive index film 22 is different, forming a non-regular film system, specifically an anti-reflection film system. The high refractive index film 21 and the low refractive index film 22 are distributed in an upper and lower interval, and both the high refractive index film 21 and the low refractive index film 22 have 12 layers. The high refractive index film 21 is H4 film material, the low refractive index film 22 is MgF2, the initial film system is G|(HL)^X|A, wherein G represents the base lens K9 glass, H represents the high refractive index film material H4, L represents the low refractive index material MgF2, X represents the period number of the film material pair, and A represents the air environment. Through the film system design software, a wider anti-reflection wave band is optimized for the multi-layer film, so that the transmittance of the coated lens in the visible light 400nm-700nm wave band and the three near-infrared laser wave bands of 980nm, 1064nm and 1470nm is simultaneously optimized to the maximum value, effectively improving the optical energy efficiency and signal-to-noise ratio of the optical system, and meeting the use requirements of time-division multiplexing in the optical system such as laser medical treatment, that is, allowing multiple wavelength laser sources to be switched during the laser surgery process, and realizing real-time imaging and monitoring.

[0020] The initial film system G|(HL)^X|A is a regular film system, as shown in Figure 2 After optimization, it is changed into a non-regular film system, as shown in Figure 1As shown, the high refractive index film 21 and the low refractive index film 22 each have 12 layers, and the thickness of each layer is different, the thickest single layer of H4 is 124.6 nm, the thinnest single layer of H4 is 10.56 nm, the total thickness of H4 is 527.18 nm, the thickest single layer of MgF2 is 116.52 nm, the thinnest single layer of MgF2 is 8.48 nm, and the total thickness of MgF2 is 604.41 nm, so that the thinnest single film layer of the film system is not less than 5 nm, and too thin will cause too large relative error and poor uniformity of the microstructure of the film, and at the same time, for visible light and near-infrared waveband, the single layer film exceeding 500 nm will consider the influence of film consumption, stress accumulation and other factors on the performance of the film.

[0021] The material of the high refractive index film 21 is also any one of TiO2, ZrO2, Al2O3, Ta2O5 and Nb2O5, the material of the low refractive index film 22 is any one of SiO2, SiO and fluorides MgF2, BaF2, CaF2 and Na3AlF6, and the combination of any one of the above high refractive index materials and any one of the low refractive index materials can realize the design of the film system, but H4 and MgF2 are a relatively mature combination, stress matching ensures that the film layer is firm, and refractive index matching ensures that the transmittance is high enough, so in the embodiment, preferably, the film material of the high refractive index film 21 is H4, and the film material of the low refractive index film 22 is MgF2.

[0022] Finally, it should be noted that the above only describes preferred embodiments of the present application and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacement for some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A time-multiplexed coated lens for laser surgery, comprising a base lens and a layer of film material fixed to the base lens, characterised in that: The film layer has two kinds of films, including high refractive index film and low refractive index film, each layer of the high refractive index film and low refractive index film has different thickness, constituting a non-regular film system, and the high refractive index film and low refractive index film are arranged in an upper and lower interval.

2. The time-multiplexed coated lens for laser surgery of claim 1, wherein: The high refractive index film has 12 layers, and the low refractive index film also has 12 layers.

3. The time-multiplexed coated lens for laser surgery of claim 1, wherein: The film material of the high refractive index film is H4, and the film material of the low refractive index film is MgF2.

4. The time-multiplexed coated lens for laser surgery of claim 2, wherein: The thickness of a single layer of the high refractive index film is 10.56-124.6nm, and the total thickness of the high refractive index film is 527.18nm.

5. The time-multiplexed coated lens for laser surgery of claim 4, wherein: The thickness of a single layer of the low refractive index film is 8.48-116.52nm, and the total thickness of the low refractive index film is 604.41nm.

6. The time-multiplexed coated lens for laser surgery of claim 1, wherein: The material of the high refractive index film is any one of TiO2, ZrO2, Al2O3, Ta2O5, Nb2O5, and the material of the low refractive index film is any one of SiO2, SiO, and fluorides MgF2, BaF2, CaF2, Na3AlF6.

7. The time-multiplexed coated lens for laser surgery of claim 1, wherein: The base lens is a K9 glass base.

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