CN105353577B - Dual-channel laser light source - Google Patents
Dual-channel laser light source Download PDFInfo
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- CN105353577B CN105353577B CN201510891824.7A CN201510891824A CN105353577B CN 105353577 B CN105353577 B CN 105353577B CN 201510891824 A CN201510891824 A CN 201510891824A CN 105353577 B CN105353577 B CN 105353577B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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Abstract
The invention discloses a dual-channel laser light source, which comprises a dual-channel dichroic mirror; a first blue laser module for emitting s polarized blue laser to the dual-channel dichroic mirror; a second blue laser module for emitting p polarized blue laser to the dichroic dual-channel mirror; a first 1/4 wave-plate and a first fluorescence disc set along the optical path direction of the first blue laser module; and a second 1/4 wave-plate and a second fluorescence disc set along the optical path direction of the second blue laser module. The dual-channel dichroic mirror comprises a first rectangular prism and a second rectangular prism whose inclined planes face each other; and a dual-channel dichroic membrane and a gummed layer that are set between the two inclined planes of the first rectangular prism and the second rectangular prism. A dual-channel laser light source is adopted in the invention and the output brightness is one times higher. According to the invention, when the laser illumination in one channel fails, a laser projector can continue working.
Description
Technical field
The present invention relates to be used for the LASER Light Source field of projection arrangement, and in particular to a kind of employing dual pathways dichroic mirror
Twin-channel laser light source.
Background technology
, used as light source, not only volume is big, weight weight, explosive, and uses for existing scialyscope Bian high voltage mercury lamps (UHP)
Short life, brightness is low, energy consumption is big, color difference, and more troublesome is the hydrargyrum material using non-environmental protection.Therefore, LASER Light Source in recent years
Becoming one of focus of field of projection display.However, due to the Bian LASER Light Source of the full laser of red, green, blue not only light sources
High cost, and the output of green laser dislikes low, even more there is laser speckle and expands the difficult problems such as even beam, therefore compares at present
Practical mode is obtaining white light with the blue LASER Excited Fluorescence powder near wavelength 460nm.As shown in figure 1, LASER Light Source is
The structure commonly used at present, the blue laser beam 9 of s polarizations are reflected to fluorescence disk 11 after inciding dichroic mirror 10, are swashed by blue laser
The red green fluorescence for issuing passes through dichroic mirror 10 after returning again, while the blue laser light fluorescence disk 11 of remainder, passes through
Reflected by dichroic mirror 10 after one extra optical system, so as to obtain the white light of red-green-blue composition.This system
Dichroic mirror design comparison is simple, as long as the blue laser of s polarizations can be reflected, transmits the red green fluorescence of s and p-polarization.But
This system has two problems：One is not transmit the blue laser of s polarizations due to dichroic mirror 10, it is therefore desirable to an extra optics
Systematic collection indigo plant laser；Two is that the laser power for exporting is relatively low, and the fluorescence being excited is weaker, and display brightness is not enough.
Application publication number is public for the Chinese invention patent application of CN 104698729A (Application No. 201410723068.2)
Open a kind of projection arrangement, the optical module of DPL projectors and the method for manufacturing dichroic mirror, it is a kind of for projection arrangement
Light film block, including：First excitation beam source, first excitation beam source are designed for transmitting with least one optical properties
First value the first excitation beam；Second excitation beam source, second excitation beam source are designed for transmitting with least
Second excitation beam of the second value of one optical properties, the second value are different from the first value；At least one fluorescent material, institute
State fluorescent material to be designed for so that first excitation beam is converted into the first conversion light beam and so that described second excites
Beam Transformation is into the second conversion light beam；First dichroic mirror, first dichroic mirror are arranged in first excitation beam source
And can be between predetermined illumination region light path in；Second dichroic mirror, second dichroic mirror are arranged in described second and swash
In light path between the predetermined illumination region of luminous electron gun and energy；First focusing arrangement, first focusing arrangement are arranged in institute
State in the light path between the predetermined illumination region of the first dichroic mirror and energy；Second focusing arrangement, described second focuses on dress
Put in the light path being arranged between the predetermined illumination region of second dichroic mirror and energy；Optical element, is maintaining
It is at least partly reflect in the case of at least one optical properties analog value of first excitation beam and the second excitation beam.
Improvement of the above-mentioned technical scheme by optical texture so as to compact conformation, efficiency are improved, but, still without to dichroic mirror
Larger improvement is carried out, the problems referred to above are still suffered from.
The Chinese invention patent application of Application No. 201510586053.0 (Publication No. CN105044806A) is disclosed
A kind of dichroic mirror and projection arrangement that beam function is closed with laser, LASER Light Source as shown in Figure 2, with a quarter-wave
Piece 14 dexterously eliminates the extra optical system of the remaining indigo plant laser of collection shown in Fig. 1, i.e.,：12 quilt of blue laser beam of s polarizations
Dichroic mirror 13 reflects, and through circularly polarized light is become after quarter-wave plate 14, Jing after exciting fluorescence, remaining blue laser is glimmering
CD 15 reflects, quarter-wave plate 14 transmit after p-polarization indigo plant laser can pass through dichroic mirror 13, thus can with simultaneously
Synthesize white light through the red green fluorescence of no polarization of dichroic mirror 13.But this LASER Light Source still has output laser power
The problem that relatively low, display brightness is not enough, the purpose of the present invention will exactly solve this problem.If the system shown in Fig. 2 is claimed
For single channel LASER Light Source, then system of the invention can be described as twin-channel laser light source, and the display brightness of the latter is expected than the former
Double.
The content of the invention
It is an object of the invention to provide a kind of twin-channel laser light source, using twin-channel laser light source, its output brightness energy
Enough double.
Idea of the invention is that：
In order to improve LASER Light Source brightness, it is necessary to increase the quantity of laser beam, how used single channel laser beam is increased
Twin-channel laser beam is added to, here it is the present invention needs the problem for solving.Conception is proposed for this present invention：If one pair can be designed
Passage dichroic film, the blue laser beam reflection of the s polarizations that it can make one of passage incident, the residue Jing after fluorescence excitation is blue to swash
Light and the transmission of red green fluorescence；And the p-polarization indigo plant laser beam transmission for making another passage incident, the residue Jing after fluorescence excitation is blue to swash
Light and the reflection of red green fluorescence, then just can reach the purpose of two-beam synthesis.Regrettably, design this dual pathways dichroic film
Difficulty is very big, because as can be seen that the optical characteristics of the two passages are actually diametrically opposite：One passage is long wave
Flow-through thin film, and another passage is shortwave flow-through thin film.The two diametrically opposite characteristics will be realized on same thin film,
It is nearly impossible thing.But, if we adjust the angle of incidence of incoming laser beam, from the angle of incidence of current use system
45 ° are changed to 55 ° and 35 ° respectively, i.e., increase and decrease 10 ° respectively, and miracle no can occurDesign shows, if dichroic mirror employing cube
Prism structure, increases polarization effect as much as possible, increases the polarization separation of two polarized components on shortwave indigo plant laser wavelength, while
Suppress the polarization separation on long-wavelength fluorescence wave band, then above-mentioned design is in the cards.Although this block prism structure is thin
The threshold for resisting laser damage of film and glue-line can be lower than slab construction, but as dual pathways indigo plant laser beam is incident on dichroic film
Position it is different, therefore output intensity is expected to realize than the existing target doubled with single channel laser projection, this
Light-source system is in, still do not lose its using value in the laser projection of low-light level.
According to above-mentioned conception, used dichroic mirror must make following change：1. replace flat board to constitute two with block prism
To Look mirror；2. the polarization state of pair incident indigo plant laser beam, changes into twin-channel s polarized light and p with single pass s polarized light by existing
Polarized light；3. the angle of incidence of pair incident indigo plant laser beam, changes into twin-channel 55 ° and 35 ° with single pass 45 ° by existing；4. pair
The polarization effect of dichroic mirror, it is as large as possible by now twin-channel polarization effect is changed into single pass no requirement；5.
To dichroic film, single pass requirement is now used：When angle of incidence is 45 °, to blue laser s reflection of polarizations, p-polarization transmission, to red green
Fluorescence is all transmitted.To twin-channel requirement of the invention：When angle of incidence is 55 °, with 45 ° of angle of incidence when single channel as, i.e.,
To blue laser s reflection of polarizations, p-polarization transmission, red green fluorescence is all transmitted；And when angle of incidence is 35 °, to blue laser be also
S reflection of polarizations, p-polarization transmission, but all reflect to red green fluorescence.
For achieving the above object, the concrete technical scheme taken of the present invention is：
A kind of twin-channel laser light source, including：
Dual pathways dichroic mirror；
The first blue laser module for the blue laser of s polarizations is sent to the dual pathways dichroic mirror；
The second blue laser module for the blue laser of p-polarization is sent to the dual pathways dichroic mirror；
Along the first quarter wave plate (also referred to as the first quarter-wave plate) that the optical path direction of the described first blue laser module is arranged
With the first fluorescence disk；
Along the second quarter wave plate (also referred to as the second quarter-wave plate) that the optical path direction of the described second blue laser module is arranged
With the second fluorescence disk.
Further, in the present invention, the first described blue laser module sends the blue laser of s polarizations in the dual pathways two
It it is 55 ° to the angle of incidence on the dual pathways dichroic film of Look mirror；The blue laser that the blue laser module of described second sends p-polarization exists
Angle of incidence on the dual pathways dichroic film of the dual pathways dichroic mirror is 35 °.The dual pathways dichroic film of the present invention, it is incident
Either 55 ° or 35 ° of angle, is all polarization membrane property in shortwave indigo plant laser wavelength area：S reflection of polarizations, p-polarization transmission；And
When the red green fluorescence area of long wave, 55 ° of angle of incidence, s and p-polarization are transmitted, and during 35 ° of angle of incidence, s and p-polarization reflect.
The blue laser of the s polarizations sent by the first blue laser module incides the bilateral of dual pathways dichroic mirror with 55 ° of angles
To all be reflected when on road dichroic film, and after through the first quarter-wave plate, the blue laser that s is polarized is changed into into circle
The blue laser of polarization, this circularly polarized blue laser light incident inspire red green fluorescence to the first fluorescence disk, and be excited out is red green
Natural light of the fluorescence for no polarization, the dual pathways dichroic film that can pass through the first quarter-wave plate and dual pathways dichroic mirror go out
Penetrate, and remaining circular polarization indigo plant laser is changed through after the first quarter-wave plate by the first glimmering CD reflection after exciting fluorescence
For p-polarization light, thus the dual pathways dichroic film of dual pathways dichroic mirror can be passed through, and it is red green with what is excited by the first fluorescence disk
Fluorescence synthesizes the white light of a passage together.At the same time, the blue laser of the p-polarization that the second blue laser module sends is with 35 ° of angles
To be transmitted when inciding on the dual pathways dichroic film of dual pathways dichroic mirror, and after through the second quarter-wave plate,
The blue laser of p-polarization is changed into into circularly polarized blue laser, this circularly polarized blue laser light incident is inspired to the second fluorescence disk
The red green fluorescence for coming natural light also for no polarization, can pass through the second quarter-wave plate, and by the double of dual pathways dichroic mirror
Passage dichroic film 5 reflects, and remaining circular polarization indigo plant laser is reflected by fluorescence disk 4 ' after exciting fluorescence, through quarter-wave
Be changed into s polarized light after piece 3 ', thus also can be reflected by the dual pathways dichroic film of dual pathways dichroic mirror 2, and with by second
The red green fluorescence that fluorescence disk is excited synthesizes the white light of another passage together.The white light of the two passages is in a cube dichroic prism
Outside is intersecting, and is collimated with a collimating lens.
The blue laser beam of the first blue laser module incides the incident luminous point on dual pathways dichroic film and the second blue laser
The blue laser beam of module incides the distance between incident luminous point on dual pathways dichroic film by following conditional decision：Make two beams
The outgoing intersection point of light is located at the outside of cube dichroic prism.
Described dual pathways dichroic mirror, including：
The first corner cube prism and the second corner cube prism that inclined-plane is oppositely arranged；
The dual pathways dichroic film being arranged between two inclined-planes of first corner cube prism and the second corner cube prism and glue
Close layer.
It is following as the preferred technical solution of the present invention：
Described dual pathways dichroic film is arranged on the inclined-plane of first corner cube prism, the one side of described cementing layer
It is connected with the dual pathways dichroic film, another side is connected with the inclined-plane of second corner cube prism.
The first described corner cube prism and the second corner cube prism are equal in magnitude, the first described corner cube prism and the second right angle
Prism is isosceles right-angle prism, i.e., its angle is 45 degree, 45 degree, 90 degree.
Described dual pathways dichroic film includes：Be sequentially provided with the inclined-plane of the first corner cube prism the first matching membrane system,
Main membrane system and the second matching membrane system；
The first described matching membrane system and the second matching membrane system are by high refractive index film, secondary high refractive index film and secondary low refraction
Rate film is constituted；Described main membrane system is made up of high refractive index film, secondary high refractive index film, secondary low refractive index film and low refractive index film；
Described high refractive index film is TiO2Film, secondary high refractive index film are Ta2O5Film, secondary low refractive index film are SiO2Film, low refractive index film
For MgF2Film.High refractive index film, secondary high refractive index film, secondary low refractive index film and low refractive index film in the present invention, it is high, secondary it is high,
It is secondary it is low, low be relative concept, for showing the relative height of refractive index.
The described first matching membrane system number of plies is 8 layers, from the inclined-plane of the first corner cube prism outwards each film layer thickness successively
For：283.2,11.7,60.7,143.2,70.6,40.1,91.1,49.3, unit is nm；In the first matching membrane system, the 4th layer
For high refractive index film, the 2nd, 6,8 layers are time high refractive index film, and remaining is time low refractive index film.
Described main membrane system is 47 layers, is followed successively by from the thickness of the outside each film layer of the first matching membrane system：90.7,39.2,
65.8,55.7,91.3,32.3,117.3,15.9,31.7,77.4,43.7,89.9,55.3,48.5,53.4,98.4,27.3,
92.5,20.8,157.6,9.4,161.9,88.2,350.5,96.6,437.7,87.3,462.1,64.2,71.5,101.4,
11.0,215.7,71.5,138.6,337.4,42.4,67.5,149.7,14.0,178.8,57.4,5.6,164.7,18.5,
181.5,60.4, unit is nm；In main membrane system, the 2nd, 4,9,11,13,15,17,19,21,25,27,29,37,42,47 layers
For high refractive index film, the 6th, 23,32,34,40,43,45 layers are time high refractive index film, and the 3rd, 8,22,24,30,35,38 layers is secondary
Low refractive index film, remaining is low refractive index film.
The second described matching membrane system number of plies is 13 layers, is followed successively by from the thickness of the outside each film layer of main membrane system：157.6,
8.9,168.9,63.9,170.1,9.1,154.6,57.5,383.3,57.5,27.3,32.7,36.0, unit is nm；Second
In matching membrane system, the 2nd, 4,6,8,10 layers is high refractive index film, and the 11st, 13 layers are time high refractive index film, and remaining is time low refraction
Rate film.
A kind of projection arrangement, using the twin-channel laser light source of the present invention, using twin-channel laser light source, its output brightness
Can double.
Compared with prior art, the invention has the beneficial effects as follows：
First, prior art Bian single channel technology, due to only one of which laser module, output brightness is relatively low.And this
Bright Bian is incided with different incidence angles with twin-channel laser light source and directly closed on the dual pathways dichroic film beam, and output brightness can
Prestige is doubled.But this is not realized in the past, be primarily due to the design of twin-channel dichroic film be considered as can not
Can.But the present invention is by block prism (the first corner cube prism and the second corner cube prism), 4 kinds of thin-film materials and two matchings
Membrane system, the height for realizing the high-transmission rate and the zone of reflections of different polarization states transmission bands in the diametrically opposite dual pathways of optical characteristics are anti-
Penetrate rate.Second, the twin-channel laser light source of the present invention have for used single channel LASER Light Source one it is significantly excellent
More property, here it is, when the laser lighting of one of passage is failed, laser projection remains to work on, and simply brightness has
Reduced, and unlike single channel laser light source projection just can not be worked completely.
Description of the drawings
Fig. 1 is a kind of operation principle schematic diagram of the LASER Light Source for now using single channel dichroic mirror；
Fig. 2 is the operation principle schematic diagram of another kind of LASER Light Source for now using single channel dichroic mirror；
Fig. 3 is the operation principle schematic diagram of twin-channel laser light source of the present invention；
Fig. 4 is the structural representation of dual pathways dichroic mirror of the present invention；
Fig. 5 is thickness and the corresponding relation figure of refractive index of the dual pathways dichroic film of the present invention per tunic；
Fig. 6 is the polarization transmission light splitting curve of angle of incidence dual pathways dichroic film when being 55 °；
Fig. 7 is the polarization transmission light splitting curve of angle of incidence dual pathways dichroic film when being 35 °.
Specific embodiment
Fig. 1 is a kind of operation principle schematic diagram of the LASER Light Source for now using single channel dichroic mirror.As shown in figure 1, wavelength
For 460nm or so blue laser beam 9 with s polarized light outgoing, and with 45 ° of incident angles to dichroic mirror 10, by dichroic
Mirror 10 incides fluorescence disk 11 after reflecting, and dichroic mirror is passed through after being reflected by fluorescence disk 11 by the red green fluorescence of blue laser excitation
10；And remaining blue laser light fluorescence disk 11 after fluorescence is excited, the extra optical of tri- reflecting mirrors of Jing and collimating lens composition
Systematic collection, is finally reflected by dichroic mirror 10, together with the red green fluorescence through dichroic mirror 10 synthesizes white light.Here it is existing
Scialyscope LASER Light Source.Obviously, this LASER Light Source has two problems：One is not transmit s polarizations due to dichroic mirror 10
Blue laser, it is therefore desirable to which an extra optical system collects blue laser；Two is that the laser power for exporting is relatively low, the fluorescence being excited
Weaker, display brightness is not enough.
Fig. 2 be it is improved after another kind now with the LASER Light Source operation principle schematic diagram of single channel dichroic mirror.Such as Fig. 2
Shown, this improved single channel dichroic mirror LASER Light Source mainly has two changes：One is to have introduced an a quarter
Wave plate 14；Two is that dichroic mirror 13 can reflect the blue laser 12 of s polarizations and transmit the blue laser beam of p-polarization.These changes make
Obtain 45 ° of incident blue laser beams 12 of s polarizations and reflected by dichroic mirror 13 and become circular polarization with quarter-wave plate 14 through after
Light, Jing after exciting fluorescence, remaining circular polarization indigo plant laser becomes after being reflected by fluorescence disk 15 and being transmitted with quarter-wave plate 14 again
P-polarization indigo plant laser, in can be through dichroic mirror 13, thus can be red green with the no polarization simultaneously through dichroic mirror 13
Fluorescence synthesizes white light.
The LASER Light Source of the improved single channel dichroic mirror shown in above-mentioned Fig. 2, although eliminate shown in Fig. 1
Extra blue laser collection system, had both saved cost, can reduce light source volume again, reduced the complexity debug, but this
LASER Light Source still has that output laser power is relatively low, display brightness is not enough, for this purpose, the present invention proposes the dual pathways
New departure of dichroic mirror and its LASER Light Source.
Fig. 3 is the operation principle schematic diagram of twin-channel laser light source of the present invention；Fig. 4 is dual pathways dichroic mirror of the present invention
Structural representation.As shown in Figure 3 and Figure 4, twin-channel laser light source, including：Dual pathways dichroic mirror 2；For to the dual pathways two
The first blue laser module 1 of the blue laser of s polarizations is sent to Look mirror 2；For the indigo plant of p-polarization is sent to dual pathways dichroic mirror 2
The blue laser module 1 ' of the second of laser；The first quarter wave plate 3 for arranging along the reflected light path direction of the first blue laser module 1 and the
One fluorescence disk 4；The second quarter wave plate 3 ' arranged along the optical path direction of the second blue laser module 1 ' and the second fluorescence disk 4 '.Bilateral
Road dichroic mirror, including：The first corner cube prism 7 and the second corner cube prism 8 that inclined-plane is oppositely arranged；It is arranged on the first corner cube prism
Dual pathways dichroic film 5 and cementing layer 6 between 7 and 8 two inclined-planes of the second corner cube prism.Dual pathways dichroic film 5 is arranged on
On the inclined-plane of the first corner cube prism 7, the one side of cementing layer 6 is connected with dual pathways dichroic film 5, another side and the second corner cube prism
8 inclined-plane connection.First corner cube prism 7 and the second corner cube prism 8 are equal in magnitude, are isosceles right-angle prism, and its angle is 45
Degree, 45 degree, 90 degree.First corner cube prism 7 and the second corner cube prism 8 are made up of K9 optical glass.Dual pathways dichroic film 5 includes
The first matching membrane system, main membrane system and the second matching membrane system outwards set gradually along 7 inclined-plane of the first corner cube prism, then uses up
Learn glue mutually glued with 8 inclined-plane of the second corner cube prism.First matching membrane system and the second matching membrane system are by high refractive index film, secondary high folding
Penetrate rate film and time low refractive index film composition；Main membrane system is by high refractive index film, secondary high refractive index film, secondary low refractive index film and low refraction
Rate film is constituted.High refractive index film is TiO2Film, it is 2.385 in the refractive index of wavelength 550nm；Secondary high refractive index film is Ta2O5
Film, it is 2.11 in the refractive index of wavelength 550nm；Secondary low refractive index film is SiO2Film, it in the refractive index of wavelength 550nm is
1.46；Low refractive index film is MgF2Film, is 1.38 in the refractive index of wavelength 550nm.
Dual pathways dichroic film 5 of the blue laser of the s polarizations that the first blue laser module 1 sends in dual pathways dichroic mirror 2
On angle of incidence be 55 °；The dual pathways of the blue laser of the p-polarization that the second blue laser module 1 ' sends in dual pathways dichroic mirror 2
Angle of incidence on dichroic film 5 is 35 °, and its polarization state is p-polarization light.The dual pathways dichroic film 5 of the present invention has following strange
Special optical characteristics, i.e., the blue laser-bounce and the indigo plant of p-polarization when angle of incidence is 55 °, to the s polarizations of wavelength 460nm or so
Laser is transmitted, and red green fluorescence is transmitted；And when angle of incidence is 35 °, it is same to the blue laser of s polarizations of wavelength 460nm or so
For reflection, p-polarization indigo plant laser be similarly transmission, with angle of incidence be 55 ° when it is identical, and to red green fluorescence be reflect, with incidence
Angle is contrary when being 55 °.
Based on said structure feature, the blue laser of the s polarizations sent by blue laser module 1 incides the dual pathways with 55 ° of angles
To all be reflected during the A points of the dual pathways dichroic film 5 of dichroic mirror 2, and after through quarter-wave plate 3, s is polarized
Blue laser be changed into circularly polarized blue laser, this circularly polarized blue laser light incident inspires red green fluorescence to fluorescence disk 4, is swashed
Natural light of the red green fluorescence for issuing for no polarization, can pass through the dual pathways of quarter-wave plate 3 and dual pathways dichroic mirror 2
5 outgoing of dichroic film, and remaining circular polarization indigo plant laser is reflected by fluorescence disk 4 after exciting fluorescence, after quarter-wave plate 3
Be changed into p-polarization light, thus the dual pathways dichroic film 5 of dual pathways dichroic mirror 2 can be passed through, and with excited by fluorescence disk 4
Red green fluorescence synthesizes the white light of a passage together.At the same time, the blue laser of the p-polarization that another blue laser module 1 ' sends
To be transmitted during the B points of the dual pathways dichroic film 5 that dual pathways dichroic mirror 2 is incided with 35 ° of angles, and pass through a quarter
After wave plate 3 ', the blue laser of p-polarization is changed into into circularly polarized blue laser, this circularly polarized blue laser light incident to fluorescence disk 4 ',
The red green fluorescence for being excited out natural light also for no polarization, can pass through quarter-wave plate 3 ', and by dual pathways dichroic
The dual pathways dichroic film 5 of mirror 2 reflects, and after exciting fluorescence, remaining circular polarization indigo plant laser is reflected by fluorescence disk 4 ', passes through four
It is changed into s polarized light after/mono- wave plate 3 ', thus also can be reflected by the dual pathways dichroic film 5 of dual pathways dichroic mirror 2, and
Synthesize the white light of another passage together with the red green fluorescence excited by fluorescence disk 4 '.The white light of the two passages meets at F points, and
Collimated with a collimating lens.Incident luminous point A of the blue laser module 1 on the dual pathways dichroic film 5 of dual pathways dichroic mirror 2
And distance of the blue laser module 1 ' between the incident luminous point B on the dual pathways dichroic film 5 of dual pathways dichroic mirror 2 is by following
Conditional decision：The outgoing intersection point F of two passages is made to be located at outside cube edge mirror body (the first corner cube prism 7 and the second corner cube prism 8).
Fig. 5 is thickness and the corresponding relation figure of refractive index of the dual pathways dichroic film of the present invention 5 per tunic.The dual pathways two to
Color film 5 is made up of the first matching membrane system, main membrane system and the second matching membrane system for setting gradually, and the first matching membrane system and second is matched
Membrane system is by high refractive index film, three kinds of material compositions of secondary high refractive index film and secondary low refractive index film；Main membrane system by high refractive index film,
Secondary high refractive index film, four kinds of material compositions of secondary low refractive index film and low refractive index film.High refractive index film is TiO2Film, it is in wavelength
The refractive index of 550nm is 2.385；Secondary high refractive index film is Ta2O5Film, it is 2.11 in the refractive index of wavelength 550nm；Secondary low folding
Rate film is penetrated for SiO2Film, it is 1.46 in the refractive index of wavelength 550nm；Low refractive index film is MgF2Film, in the folding of wavelength 550nm
Rate is penetrated for 1.38.Total number of plies of whole dual pathways dichroic film is 68 layers, and gross thickness is 6834nm.First matches the membrane system number of plies is
8 layers, it is followed successively by from the thickness of the outside each film layer in 7 inclined-plane of the first corner cube prism：283.2,11.7,60.7,143.2,70.6,
40.1,91.1,49.3, unit is nm；In the first matching membrane system, the 4th layer is high refractive index film, and the 2nd, 6,8 layers are time high folding
Rate film is penetrated, remaining is time low refractive index film.Main membrane system is 47 layers, is followed successively by from the thickness of the outside each film layer of the first matching membrane system：
90.7,39.2,65.8,55.7,91.3,32.3,117.3,15.9,31.7,77.4,43.7,89.9,55.3,48.5,53.4,
98.4,27.3,92.5,20.8,157.6,9.4,161.9,88.2,350.5,96.6,437.7,87.3,462.1,64.2,
71.5,101.4,11.0,215.7,71.5,138.6,337.4,42.4,67.5,149.7,14.0,178.8,57.4,5.6,
164.7,18.5,181.5,60.4, unit is nm；In main membrane system, the 2nd, 4,9,11,13,15,17,19,21,25,27,29,
37th, 42,47 layers is high refractive index film, and the 6th, 23,32,34,40,43,45 layers is time high refractive index film, the 3rd, 8,22,24,30,
35th, 38 layers are time low refractive index film, and remaining is low refractive index film.The second matching membrane system number of plies is 13 layers, outwards each from main membrane system
The thickness of film layer is followed successively by：157.6,8.9,168.9,63.9,170.1,9.1,154.6,57.5,383.3,57.5,27.3,
32.7,36.0, unit is nm；In the second matching membrane system, the 2nd, 4,6,8,10 layers is high refractive index film, and the 11st, 13 layers is secondary
High refractive index film, remaining is time low refractive index film.
The polarization transmission light splitting curve of dual pathways dichroic film 5 when Fig. 6 and Fig. 7 are 55 ° and 35 ° of angle of incidence respectively.From Fig. 6
With Fig. 7 as can be seen that either 55 ° or 35 ° of angle of incidence, is all polarization membrane property in shortwave indigo plant laser wavelength area：S polarizations are anti-
Penetrate, p-polarization transmission；And in the red green fluorescence area of long wave, during 55 ° of angle of incidence, s and p-polarization are transmitted, conversely, during 35 ° of angle of incidence, s
Reflect with p-polarization.This characteristic is very unusual：On the one hand, to angle of incidence 55 ° be a long wave flow-through thin film, it is and right
35 ° of angle of incidence is a shortwave flow-through thin film；On the other hand, the polarization effect for having maximum is required in shortwave indigo plant laser wavelength area,
That is s is polarized and the optical characteristics of p-polarization can produce maximum separation, and requires there is minimum polarization effect in the red green fluorescence area of long wave
Should, i.e. the optical characteristics of s polarizations and p-polarization require that separation is as little as possible.These to be provided simultaneously with same thin film complete
Contrary characteristic, here it is the subversiveness of this dual pathways dichroic film design breaks through.Although p-polarization during 35 ° of angle of incidence is red
The design result of green fluorescence reflection characteristic be not already it is ideal, but this can meet actually used requirement.Actual characteristic
For：If the wave-length coverage in shortwave indigo plant laser wavelength area is 440-480nm, the wave-length coverage in the red green fluorescence area of long wave is 500-
660nm, then in short wavelength region and long wavelength region, the average transmittance (T) or reflectance (R) of p and s polarizations are respectively：To incidence
55 ° of angle, short wavelength region Tp=98.2%, Rs=100%, long wavelength region Tp=98.1%, Ts=98.9%；Then to angle of incidence
35 °, short wavelength region Tp=97.7%, Rs=99.5%, long wavelength region Rp=93.1%, Rs=99.9%.This dual pathways two
The twin-channel laser light source of laser projection device be cannot be only used for color film 5, and can in the case of appropriate modulation fluorescence disk
As multichannel optical switch.
Claims (10)
1. a kind of twin-channel laser light source, including：Dual pathways dichroic mirror；It is inclined for sending p to the dual pathways dichroic mirror
The blue laser module of the second of the blue laser for shaking；The second quarter wave plate for arranging along the optical path direction of the described second blue laser module and
Second fluorescence disk；Characterized in that, also including：
The first blue laser module for the blue laser of s polarizations is sent to the dual pathways dichroic mirror；
The first quarter wave plate arranged along the optical path direction of the described first blue laser module and the first fluorescence disk.
2. twin-channel laser light source according to claim 1, it is characterised in that described dual pathways dichroic mirror includes：
The first corner cube prism and the second corner cube prism that inclined-plane is oppositely arranged；
The dual pathways dichroic film being arranged between two inclined-planes of first corner cube prism and the second corner cube prism and cementing layer.
3. twin-channel laser light source according to claim 2, it is characterised in that described dual pathways dichroic film is arranged on
On the inclined-plane of first corner cube prism, the one side of described cementing layer is connected with the dual pathways dichroic film, another side with
The inclined-plane connection of second corner cube prism.
4. twin-channel laser light source according to claim 2, it is characterised in that the first described corner cube prism and second straight
Angle prism is equal in magnitude, is isosceles right-angle prism.
5. twin-channel laser light source according to claim 2, it is characterised in that described dual pathways dichroic film includes：
The first matching membrane system, main membrane system and the second matching membrane system are sequentially provided with the inclined-plane of the first corner cube prism；
The first described matching membrane system and the second matching membrane system are by high refractive index film, secondary high refractive index film and secondary low refractive index film
Composition；Described main membrane system is made up of high refractive index film, secondary high refractive index film, secondary low refractive index film and low refractive index film；It is described
High refractive index film be TiO2Film, secondary high refractive index film are Ta2O5Film, secondary low refractive index film are SiO2Film, low refractive index film is
MgF2Film.
6. twin-channel laser light source according to claim 5, it is characterised in that described dual pathways dichroic film includes：
The first described matching membrane system number of plies is 8 layers, is followed successively by from the thickness of the outside each film layer in the inclined-plane of the first corner cube prism：283.2,
11.7,60.7,143.2,70.6,40.1,91.1,49.3, unit is nm；In the first matching membrane system, the 4th layer is high index of refraction
Film, the 2nd, 6,8 layers are time high refractive index film, and remaining is time low refractive index film.
7. twin-channel laser light source according to claim 5, it is characterised in that described main membrane system is 47 layers, from first
The thickness of the outside each film layer of matching membrane system is followed successively by：90.7,39.2,65.8,55.7,91.3,32.3,117.3,15.9,31.7,
77.4,43.7,89.9,55.3,48.5,53.4,98.4,27.3,92.5,20.8,157.6,9.4,161.9,88.2,350.5,
96.6,437.7,87.3,462.1,64.2,71.5,101.4,11.0,215.7,71.5,138.6,337.4,42.4,67.5,
149.7,14.0,178.8,57.4,5.6,164.7,18.5,181.5,60.4, unit is nm；In main membrane system, the 2nd, 4,9,
11st, 13,15,17,19,21,25,27,29,37,42,47 layers is high refractive index film, and the 6th, 23,32,34,40,43,45 layers is secondary
High refractive index film, the 3rd, 8,22,24,30,35,38 layers are time low refractive index film, and remaining is low refractive index film.
8. twin-channel laser light source according to claim 5, it is characterised in that the second described matching membrane system number of plies is 13
Layer, is followed successively by from the thickness of the outside each film layer of main membrane system：157.6,8.9,168.9,63.9,170.1,9.1,154.6,57.5,
383.3,57.5,27.3,32.7,36.0, unit is nm；In the second matching membrane system, the 2nd, 4,6,8,10 layers is high index of refraction
Film, the 11st, 13 layers are time high refractive index film, and remaining is time low refractive index film.
9. twin-channel laser light source according to claim 1, it is characterised in that the blue laser module of described first sends s
Angle of incidence of the blue laser of polarization on the dual pathways dichroic film of the dual pathways dichroic mirror is 55 °.
10. twin-channel laser light source according to claim 1, it is characterised in that the blue laser module of described second sends p
Angle of incidence of the blue laser of polarization on the dual pathways dichroic film of the dual pathways dichroic mirror is 35 °.
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| WO2014196015A1 (en) * | 2013-06-04 | 2014-12-11 | Ｎｅｃディスプレイソリューションズ株式会社 | Illumination optical system and projector |
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