CN104561908A - Preparation method for multi-waveband high-reflective film - Google Patents
Preparation method for multi-waveband high-reflective film Download PDFInfo
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- CN104561908A CN104561908A CN201410849770.3A CN201410849770A CN104561908A CN 104561908 A CN104561908 A CN 104561908A CN 201410849770 A CN201410849770 A CN 201410849770A CN 104561908 A CN104561908 A CN 104561908A
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Abstract
The invention discloses a preparation method for a multi-waveband high-reflective film. The method can be utilized for designing and plating the multi-waveband high-reflective film with a wide range of near-infrared and intermediate-infrared optical wavebands of 1.064 microns and 3.7-4.8 microns, high quality and a large incident angle, improving the firmness of a film layer and prolonging the service life of the film in an outdoor severe environment. According to the technical scheme adopted by the method, the method comprises the following steps: (1) taking quartz glass as a substrate and calculating an optical thickness value of each layer of film by a design formula of a film system; (2) cleaning the plated substrate; (3) heating and baking the substrate; (4) bombarding the substrate by an ion source before and during film plating; (5) putting ZnS and Al2O3 film materials into a crucible of a rotary electronic gun evaporation source, and finishing the film-plating process by an optical vacuum film plating machine according to a sequence of the formula and the thickness value in the step (1). The method overcomes the process difficulties of non-firmness and difficulty in realizing large incident angle, multiple wavebands and high reflective rate during film plating on the quartz glass substrate by nonmetal and non-semiconductor film layer materials.
Description
Technical field
The invention relates to the method being coated with optical thin film, more particularly, the present invention is a kind of plating method of multiband highly reflecting films.
Background technology
Highly reflecting films, as the one of optical thin film, are widely used in various optics and infrared components and parts, solar cell and high-power laser system.Existing much dissimilar highly reflecting films can meet the part practical application in optics and infrared technique field at present.And the requirement of practical application widely to highly reflecting films over-all properties improves constantly.Current known application high reverse--bias plated film is widely all generally use metal (as gold and silver, aluminium etc.) or metal and dielectric material or semiconductor material (as silicon, germanium etc.) to carry out being coated with of highly reflecting films.Because infrared working conditions limit, the requirement of multiband high-reflectivity in laser and infrared guidance can not be met.Highly reflecting films due to above-mentioned optical region not only require rete to be coated with very securely to cover in a quartz-optical substrate of glass; also to have the protection effect preventing from continuing in atmosphere deliquescence, and use the input angle index request of wave band to reach 45 °.But all in prior art to relate to infrared wide band highly reflecting films available infrared film item kind few, Film Design and technology difficulty are very large.And current existing infrared optics coating technique can only be selected such as: ZnS, ZnSe, YbF
3, LiF, MgF
2, ThF
4, BaF
2, AlF
3, CaF
2, the material such as Si and Ge does Coating Materials, guarantee rete is firm.Conventional film uses and places in wet environment, and the contact of surface and air moisture, transmitance and the water resistant ability of high-reflecting film can decline gradually, and the resisting laser damage ability of rete reduces gradually, can not severe environment use for a long time in the wild.
The application of infrared optics instrument is more and more extensive, as infrared imaging sensor, infrared laser etc.3um ~ 5um wave band is important atmospheric window, is also the groundwork region of infrared eye, and this wave band of laser is comparatively strong to the severe environment such as battlefield, flue dust penetrativity, and thus infrared optical thin film is extremely important to the performance controlling infrared eye.Transmitance/the reflectivity of infrared optical thin film and threshold for resisting laser damage are the important indicators of system design, therefore, improve thin film preparation process, improving 3um ~ 5um wave band transmitance/reflectivity, threshold for resisting laser damage and rete firmness is key issue urgently to be resolved hurrily at present.
Summary of the invention
Be only limitted to use metal or metal+dielectric material to be coated with the defect of the highly reflecting films of infrared wavelength range to overcome current conventional high reverse--bias coating technique, the invention provides a kind of rete firmly hard, excellent property, resisting laser damage ability is strong, field extreme environment uses permanent, can meet the multiband highly reflecting films preparation method of near infrared and mid-infrared light wave band high quality large angle incidence.
Above-mentioned purpose of the present invention can be reached by following measures: the preparation method of multiband highly reflecting films provided by the invention, it is characterized in that comprising following process for plating step:
(1) be substrate with silica glass material, use Film Design formula
G/0.2L1.3046H1.5386L1.3867H1.4427L1.4299H1.489L1.334H1.5 283L1.4085H1.3947L1.4859H1.4534L1.3168H1.625L1.292H1.461 2L4.2291H7.2759L4.2232H4.5239L4.307H7.1105L4.4724H5.6527 L4.7646H6.5785L/Air calculates the optical thickness values of every tunic and list lattice in order.Wherein, G is silica glass material substrate, and L is Al
2o
3coating materials, H is ZnS coating materials, and Air is specific refractory power N
athe air dielectric of=1, film system reference wavelength λ
c=800nm, input angle is 45 ° of 1.064um & 3.7um ~ 4.8um.The electron gun evaporation source crucible above-mentioned H and L coating materials being put into successively vacuum chamber of film coating machine is for subsequent use;
(2) in plated film substrate ultrasonic cleaning process, clean plated substrate with scavenging solution, dry up, put into vacuum chamber to be plated;
(3) heat baking substrate, under vacuum conditions, heat up gradually baking within the scope of 30 DEG C ~ 200 DEG C;
(4) in the bonding bottoming technique of optical film and Stress match technique, the optical thickness values of each tunic calculated according to aforementioned films system design formula and tabular sequence, by Al
2o
3put into ZnS two kinds of coating materials the rotating electron rifle evaporation source crucible that speed of rotation is 100 ~ 120 revs/min successively, then with optics vacuum plating unit by described step (1) listing formulas order and one-tenth-value thickness 1/10 complete plated film;
(5) assist in evaporation process at ion source, before plated film He in coating process, bombard substrate with ion source; The ion beam bombardment substrate always allowing it produce completes to plated film;
(6) in high/low temperature annealing process, the ball cover having plated film is carried out anneal after vacuum chamber naturally cools to room temperature.
The present invention has following beneficial effect compared to prior art.
(1) very high reflectivity is had with multiband highly reflecting films prepared by the inventive method.The present invention take silica glass material as the optimization Film Design of the multiband highly reflecting films of the near infrared that completes of substrate and mid-infrared light wave band high quality large angle incidence and the highly reflecting films of the near infrared be coated with and mid-infrared light wave band large angle incidence, not only rete is firm, and reaching rete one side average reflectance >=95% near infrared and mid-infrared light wave band (length) simultaneously, whole wide band scope is transparent in absorbing.Solve prior art metal or metal+dielectric material can only be used to be coated with highly reflecting films can not take into account the deficiency with high stability.
(2) because Film Design of the present invention is optimized broadband Film Design, allow each layer film thickness monitoring in coating process to have the limit of error within 5%, this can make the yield rate of product bring up to close to 100%.
(3) A of the present invention's employing: plated film substrate ultrasonic cleaning process, B: evaporation process assisted by ion source, C: the bonding bottoming technique of optical film, D: optical film Stress match technique, E: the Technology that high/low temperature annealing process etc. are special.Solve the process difficulties of the rete firmness of multiband highly reflecting films silica glass material substrate being coated with near infrared and mid-infrared light wave band high quality large angle incidence.Product passes through+70 ~-55 DEG C of high/low-temperature impact experiments and long-term field experiment proves, rete is firmly hard, and resisting laser damage is functional.
(4) plated film has excellent protection against the tide and protection effect to substrate.Because hard waterproofing membrane layer has completely cut off the contact of silica glass material surface and air moisture; make highly reflecting films have defencive function silica glass material being prevented in atmosphere to its further deliquescence simultaneously, for optical system components in the wild severe environment use for a long time and provide guarantee.
The invention solves and to use nonmetal in silica glass substrate and non-semiconductor film material plated film is insecure and more difficultly reach the process difficulties that large angle incidence multiband has high-reflectivity.Explore by experiment, adopt ZnS and Al
2o
3two kinds of plated film coating materials and technique are coated with technology and have prepared and have the highly reflecting films that very high rete firmness and wide-angle multiband have high-reflectivity (R>95%), and obtain and have from visible ray until the optimum matching Coating Materials of the transparent scope of middle-infrared band ultra wide wave band.
The present invention can be used for the equipment and instrument of laser guidance optical system, and to its optical property of raising, the weight and volume reducing instrument is significant.
Embodiment
The present invention is further illustrated below by embodiment.In the examples below,
According to invention, the preparation method of multiband highly reflecting films specifically comprises the steps:
(1) be substrate with silica glass material, use Film Design formula
G/0.2L1.3046H1.5386L1.3867H1.4427L1.4299H1.489L1.334H1.5 283L1.4085H1.3947L1.4859H1.4534L1.3168H1.625L1.292H1.461 2L4.2291H7.2759L4.2232H4.5239L4.307H7.1105L4.4724H5.6527 L4.7646H6.5785L/Air calculates the optical thickness values of every tunic and list lattice in order.Wherein, G is silica glass material substrate, and L is Al
2o
3coating materials, H is ZnS coating materials, and Air is specific refractory power N
athe air dielectric of=1, film system reference wavelength λ
c=800nm, input angle is 45 ° of 1.064um & 3.7um ~ 4.8um.The electron gun evaporation source crucible above-mentioned H and L coating materials being put into successively vacuum chamber of film coating machine is for subsequent use;
(2) in plated film substrate ultrasonic cleaning process, clean plated substrate with scavenging solution, dry up, put into vacuum chamber to be plated;
(3) heat baking substrate, under vacuum conditions, heat up gradually baking within the scope of 30 DEG C ~ 200 DEG C;
(4) in the bonding bottoming technique of optical film and Stress match technique, the optical thickness values of each tunic calculated according to aforementioned films system design formula and tabular sequence, by Al
2o
3put into ZnS two kinds of coating materials the rotating electron rifle evaporation source crucible that speed of rotation is 100 ~ 120 revs/min successively, then with optics vacuum plating unit by described step (1) listing formulas order and one-tenth-value thickness 1/10 complete plated film;
(5) assist in evaporation process at ion source, before plated film He in coating process, bombard substrate with ion source; The ion beam bombardment substrate always allowing it produce completes to plated film;
(6) in high/low temperature annealing process, the ball cover having plated film is carried out anneal after vacuum chamber naturally cools to room temperature.
Described plated film substrate ultrasonic cleaning process is put into by silica glass to fill the Ultrasonic Cleaners that scavenging solution made by ethanol, middle gear is selected to clean 10 minutes, use acetone scavenging solution again instead and clean 10 minutes, dry up with high pure nitrogen, put into clean vacuum chamber load plate frame and close the door vacuumize to be plated.
The bonding bottoming technique of described optical film is by the 0.2L tunic material (Al bonding with silica glass substrate
2o
3) be coated on the first layer.
Described optical film Stress match technique is the stress characteristics detected according to it by above-mentioned H and L two kinds of coating materials, makes the alternately arrangement of stress coating materials and tension stress coating materials.
When heating baking substrate, when being evacuated down to 10
-3during Pa magnitude, from 30 DEG C, add baking, slow intensification is raised to 200 DEG C of insulations 120 minutes always, and workpiece rotates 20 revs/min.
The ion source stated assists evaporation process to be transferred to by source parameters before plated film: plate voltage 600V, line 85mA, fills high-purity argon gas Ar or the oxygen O of purity four 9
2, by vacuum degree control 1.0 × 10
-2between Pa, with the ion beam bombardment ball cover substrate produced 20 minutes.
High/low temperature annealing process is after the silica glass having plated film is naturally cooled to room temperature, transfer to loft drier from vacuum chamber again and carry out anneal: heat up from 40 DEG C, often heat up 10 DEG C of constant temperature 10 minutes again, be raised to 130 DEG C always, constant temperature was lowered the temperature after 8 ~ 10 hours, often cooling 10 DEG C of constant temperature 10 minutes, drop to normal temperature 40 DEG C, and taking-up detects stand-by.
Described film system is made up of 27 tunics from the inside to surface, designs the optical thickness values of each tunic by above-mentioned steps (1) formulae discovery.
Embodiment 1
First U.S.'s optical thin film design software (TFCalc) is used to design the optimization film system meeting the technology of the present invention index request.With the silica glass material through optical manufacturing for substrate is at its surface coating, use Film Design formula:
G/0.2L1.3046H1.5386L1.3867H1.4427L1.4299H1.489L1.334H1.5 283L1.4085H1.3947L1.4859H1.4534L1.3168H1.625L1.292H1.461 2L4.2291H7.2759L4.2232H4.5239L4.307H7.1105L4.4724H5.6527 L4.7646H6.5785L/Air, the optical thickness values of the every tunic of computation optimization row lattice in order.In formula, G is specific refractory power is N
g=1.45, represent the substrate of silica glass material, L is specific refractory power N
lthe Al of=1.60
2o
3coating materials, H is specific refractory power N
hthe ZnS coating materials of=2.20, Air is specific refractory power N
athe air dielectric of=1, film system reference wavelength λ
c=800nm.(above H and L is the granular film material of purity 99.9%) this film system is made up of 27 tunics from the inside to surface, and the optical thickness values of each layer of 27 tunic designed by above-mentioned formulae discovery is in table 1:
Table 1 (according to the silica glass 27 tunic optical thickness theoretical mean list of film system formulae discovery in embodiment 1)
Note: do not get the value after a position radix point, because precision enough reaches design.
Film Design formula illustrates:
(1) table 1 (according to the silica glass 27 tunic optical thickness theoretical mean table of film system formulae discovery in embodiment 1) note: do not get the value after a position radix point, because precision enough reaches design.
Film Design formula illustrates:
(1) table 1 be get silica glass substrate specific refractory power mean value and according to 27 tunic optical thickness theoretical value lists of Film Design formulae discovery.
(2) in order to ensure rete firmness, the distributing order of two kinds of coating materials H and L in this Film Design formula, should meet the technical requirements of the techniques such as " the bonding bottoming technique of optical film " and " optical film Stress match technique ".Optical film bonding bottoming technique is by the 0.2L tunic material (Al bonding with fluorine gallium substrate of glass
2o
3) being coated on the first layer, can play a key effect to whole rete firmness.Optical film Stress match technique is: on Film Design and coating materials arrangement, by above-mentioned H and L two kinds of coating materials according to its stress characteristics, making stress coating materials and tension stress coating materials replace arrangement (Stress match) can play an important role to whole rete firmness.
Complete the technique of table 1, available common domestic vacuum coating film equipment completes (such as: the ZZ800 type box-type vacuum coating machine that the modern Nan Guang factory in Chengdu produces), and its technological condition comprises:
Optically coated specific equipment: vacuum plating unit, during use, can with vacuum pump by vacuum chamber to 10
-2~ 10
-3pa magnitude, the various coating materials putting into the crucible of vacuum chamber in advance, under electron beam gun (producing the electron beam of high pressure, high temperature) effect, form vapour molecule, adhere to (growth) successively at optical element substrate surface by design requirements.
Light-operated, i.e. blooming Controlling System, as the crucial accessory of vacuum plating unit, " light-operated " instrument, according to the principle of interference of light, converts the optical signal of plated film to electrical signal, the optically coated one-tenth-value thickness 1/10 of accurate identification record.
Brilliant control, i.e. quartz crystal vibration thickness Controlling System." brilliant control " instrument adheres to according to the oscillation frequency of quartz crystal and different coating materials the principle that thickness (weight) is directly proportional and converts optical thickness values to, also for detecting optically coated geometric thickness value in vacuum chamber.
Ion source, can select Kaufman type ion source assisted device.In vacuum chamber in coating process, this device can produce high energy ion bundle, auxiliary coating materials molecule fast and high-energy be deposited on substrate surface.It is the important means improving rete firmness and compactness.
Electron beam gun is e type electron beam evaporation source.Be the copper crucible of the most frequently used a kind of rounded porous evaporation coating materials, high-voltage filament ejected electron bundle is got on coating materials with 270 ° of angles, and coating materials is evaporated.
Baking, can realize with heated baking device.Common resistance wire or silica tube electric heating device can be selected, for the temperature of vacuum chamber (comprising plated film substrate).
Process for plating step is as follows:
(1) clean vacuum room load coating materials.Complete large cleaning in vacuum chamber of film coating machine after, be Al by two kinds of coating materials: L in above-mentioned Film Design formula
2o
3, H is ZnS, is the granular crystals coating materials of purity 99.9%, puts into rotatable electron gun evaporation source crucible successively, wait for below coating evaporation time use.
(2) clean plated substrate, puts into silica glass and fills the Ultrasonic Cleaners that scavenging solution made by ethanol (analytical pure of purity >=99.5%), with in gear clean 10 minutes; Use acetone (analytical pure of purity >=99.5%) scavenging solution again instead and clean 10 minutes, dry up with high pure nitrogen.Observe with spot light lamp after cleaning, substrate free from dust, stain, without the newly-increased existence such as cut and crackle, the vacuum chamber load plate frame closing the door putting into cleaning immediately vacuumizes to be plated.
(3) to heat baking substrate, when being evacuated down to 10
-3during Pa magnitude, open heated baking device.To heat from 30 DEG C baking, slowly heat up, can guarantee to heat up at the bottom of all even quartz glass substrate does not burst, and is raised to 200 DEG C of insulations 60 minutes always, and in whole temperature-rise period, the load plate of device silica glass substrate rotates by 20 revs/min of rate uniform.
(4) bombardment substrate before ion source plating: before formal plated film, be transferred to by the source parameters of Kaufman type ion source assisted device: plate voltage 600V, line 85mA, fills high-purity argon gas Ar or the oxygen O of purity four 9
2, with inflation and vacuum-control(led) system by vacuum degree control 1.0 × 10
-2pa, the ion beam bombardment silica glass substrate allowing ion source produce 7 minutes.
(5) coating materials evaporation is completed in order: plated film the optical thickness values of each tunic calculated from the order of the 1 to the 27 layer and form according to aforementioned films system design formula.Each layer optical thickness values that the judgement of optical thickness values shows with " light-operated " is as the criterion, each tunic geometric thickness value that " brilliant control " shows is the reference of calculating optical one-tenth-value thickness 1/10, and the coefficient before each tunic of formula is the multiple value that " light-operated " walks quarter wave extreme value.Period, Kaufman type ion source assisted device is always in running order, parameter and above-mentioned steps (4) just the same.In whole coating materials evaporative process, in the vacuum chamber of coating equipment, vacuum tightness is 1.0 × 10
-2pa, " electron beam gun " vaporator rate is: Al
2o
30.15 ~ 0.3nm/s, ZnS 1 ~ 1.5nm/s; Substrate diaphragm load plate workpiece speed of rotation is 20 revs/min.In whole coating process immediately, keep above-mentioned source parameters constant, the ion beam bombardment substrate always allowing it produce completes to plated film, and plated film completes continuation ion beam bombardment substrate again 7 minutes, constant temperature fell storing temperature after 60 minutes from 200 DEG C, closing high vacuum valve stops diffusion pump naturally cooling to room temperature, slow cooling.In whole temperature-fall period, the load plate of device silica glass substrate rotates by 20 revs/min of rate uniform.
(6) anneal: the silica glass having plated film, after vacuum chamber naturally cools to room temperature, fills high pure nitrogen and enters vacuum chamber, opens to take out behind the door and transfers to common loft drier and start anneal.Heat up from 40 DEG C, often heat up 10 DEG C of constant temperature 10 minutes again, and be raised to 130 DEG C, constant temperature starts cooling after 8 ~ 10 hours always, the constant temperature 10 minutes of often lowering the temperature after 10 DEG C, drop to always normal temperature 40 DEG C can take out detect stand-by.
Embodiment 2
Repeat the method for EXPERIMENTAL EXAMPLE 1 by the optical thickness values of each layer of 27 tunic calculating design in following table 2, adopt each layer optical thickness of optimization film system's formula of the present invention and table 2, in coating process step:
(1) processing step (1) in embodiment 1 is repeated;
(2) processing step (2) in embodiment 1 is repeated;
(3) processing step (3) in embodiment 1 is repeated;
(4) processing step (4) in embodiment 1 is repeated;
(5) processing step (5) in embodiment 1 is repeated;
After plated film completes, the actual optical thickness of each tunic of record is in table 2:
Table 2 (the optical thickness values table of actual silica glass 27 tunic be coated with of embodiment 2)
Note: do not get the value after a position radix point, because precision enough reaches design.
(6) anneal: repeat processing step (6) in embodiment 1.
Every characteristic index test result that above-described embodiment is coated with rete is as follows:
(1) at the one side average reflectance of mid-infrared light wave band (length) be:
Near-infrared band: 1.064um R >=95%
Middle-infrared band: 3.7um ~ 4.8um R >=95%
(2) rete stability and resisting laser damage test: the requirement all meeting optical thin film national Specification, and by air standard+70 ~-55 DEG C of high/low-temperature impact experiments.
(3) rete humidity resistance: the requirement meeting optical thin film national Specification; prove by the multinomial experiment such as soaking in field usage and water, the multiband highly reflecting films of silica glass near infrared prepared by above-described embodiment and mid-infrared light wave band high quality large angle incidence have extraordinary moisture protection effect to silica glass material.
Claims (10)
1. a preparation method for multiband highly reflecting films, is characterized in that comprising following process for plating step:
(1) be substrate with silica glass material, use Film Design formula
G/0.2L1.3046H1.5386L1.3867H1.4427L1.4299H1.489L1.334H1.5 283L1.4085H1.3947L1.4859H1.4534L1.3168H1.625L1.292H1.461 2L4.2291H7.2759L4.2232H4.5239L4.307H7.1105L4.4724H5.6527 L4.7646H6.5785L/Air calculates the optical thickness values of every tunic and list lattice in order, wherein, G is silica glass material substrate, and L is Al
2o
3coating materials, H is ZnS coating materials, and Air is specific refractory power N
athe air dielectric of=1, film system reference wavelength λ
c=800nm, input angle is 45 ° of 1.064um & 3.7um ~ 4.8um.
2. the electron gun evaporation source crucible above-mentioned H and L coating materials being put into successively vacuum chamber of film coating machine is for subsequent use;
(2) in plated film substrate ultrasonic cleaning process, clean plated substrate with scavenging solution, dry up, put into vacuum chamber to be plated;
(3) heat baking substrate, under vacuum conditions, heat up gradually baking within the scope of 30 DEG C ~ 200 DEG C;
(4) in the bonding bottoming technique of optical film and Stress match technique, the optical thickness values of each tunic calculated according to aforementioned films system design formula and tabular sequence, by Al
2o
3put into ZnS two kinds of coating materials the rotating electron rifle evaporation source crucible that speed of rotation is 100 ~ 120 revs/min successively, then with optics vacuum plating unit by described step (1) listing formulas order and one-tenth-value thickness 1/10 complete plated film;
(5) assist in evaporation process at ion source, before plated film He in coating process, bombard substrate with ion source; The ion beam bombardment substrate always allowing it produce completes to plated film;
(6) in high/low temperature annealing process, the ball cover having plated film is carried out anneal after vacuum chamber naturally cools to room temperature.
3. the preparation method of multiband highly reflecting films as claimed in claim 1, it is characterized in that, described plated film substrate ultrasonic cleaning process is put into by silica glass to fill the Ultrasonic Cleaners that scavenging solution made by ethanol, middle gear is selected to clean 10 minutes, use acetone scavenging solution again instead and clean 10 minutes, dry up with high pure nitrogen, put into clean vacuum chamber load plate frame and close the door vacuumize to be plated.
4. the preparation method of multiband highly reflecting films as claimed in claim 1, it is characterized in that, the bonding bottoming technique of described optical film, is by the 0.2L tunic material (Al bonding with silica glass substrate
2o
3) be coated on the first layer.
5. the preparation method of the multiband highly reflecting films of quartz substrate near infrared as claimed in claim 1 and mid-infrared light wave band high quality large angle incidence, it is characterized in that, described optical film Stress match technique, be the stress characteristics that above-mentioned H and L two kinds of coating materials are detected according to it, make the alternately arrangement of stress coating materials and tension stress coating materials.
6. the preparation method of multiband highly reflecting films as claimed in claim 1, is characterized in that, when heating baking substrate, when being evacuated down to 10
-3during Pa magnitude, from 30 DEG C, add baking, slow intensification is raised to 200 DEG C of insulations 120 minutes always, and workpiece rotates 20 revs/min.
7. the preparation method of multiband highly reflecting films as claimed in claim 1, it is characterized in that, evaporation process assisted by described ion source, is be transferred to by source parameters before plated film: plate voltage 600V, line 85mA, fills high-purity argon gas Ar or the oxygen O of purity four 9
2, by vacuum degree control 1.0 × 10
-2between Pa, with the ion beam bombardment ball cover substrate produced 20 minutes.
8. the preparation method of multiband highly reflecting films as claimed in claim 1, it is characterized in that, high/low temperature annealing process is after the silica glass having plated film is naturally cooled to room temperature, transfer to loft drier from vacuum chamber again and carry out anneal: heat up from 40 DEG C, often heat up 10 DEG C of constant temperature 10 minutes again, is raised to 130 DEG C always, constant temperature was lowered the temperature after 8 ~ 10 hours, often cooling 10 DEG C of constant temperature 10 minutes, drop to normal temperature 40 DEG C, and taking-up detects stand-by.
9. the preparation method of multiband highly reflecting films as claimed in claim 1, it is characterized in that, described film system is made up of 27 tunics from the inside to surface, designs the optical thickness values of each tunic by above-mentioned steps (1) formulae discovery.
10. the preparation method of highly reflecting films as claimed in claim 8, it is characterized in that, the optical thickness values of described each tunic is as shown in the table:
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| CN106291908A (en) * | 2016-10-18 | 2017-01-04 | 中国科学院国家天文台南京天文光学技术研究所 | Golden enhancement mode reflectance coating system and preparation method for large-scale astronomical telescope primary mirror |
| CN106835030A (en) * | 2016-12-13 | 2017-06-13 | 西南技术物理研究所 | Infrared high antireflection film structure of wide-angle multiband and preparation method thereof |
| CN108165933A (en) * | 2018-01-15 | 2018-06-15 | 江苏冠达通电子科技有限公司 | The film plating process of prism |
| CN114035248A (en) * | 2021-11-23 | 2022-02-11 | 中国航空工业集团公司洛阳电光设备研究所 | Multiband antireflection film system of zinc sulfide substrate and film coating method thereof |
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