Terbium Gallium Garnet(TGG) as a magneto-optical crystal, is an optimum material for Faraday devices (Rotator and Isolator) in the range from 400nm-1100nm, excluding 470-500nm.The Faraday rotator consists of a TGG rod contained inside a special designed magnet. The rotation sense of the polarization of a light beam passing through the rotator only depends on the direction of the magnetic field and not on the direction of propagation of the light beam. The optical isolator is a Faraday rotator set between two suitably aligned polarizers which allows a light beam to pass through in one direction only.Photonchina TGG has a combination of excellent properties such as large Verdet constant, low light loss, high thermal conductance and high light damage threshold which makes it a unique material for Faraday devices particularly suitable for YAG lasers and Ti: sapphire tunable lasers, ring lasers and seed injected lasers.
Photonchina supplies a wide variety of mirrors, ranging from laser line mirrors, harmonic separator mirrors, high reflection (HR) mirrors, partial reflection mirrors and metallic coated mirrors. Wide selection of rectangular, round, elliptical, or custom shape mirrors with flat, spherical concave or convex and cylindrical surfaces can all be produced.
HR laser line Mirrors (HR Mirrors)
HR laser line mirrors (HR) provide optimized performance at certain wavelength and certain angle of incidence (AOI). Mirror consists of substrate and multilayer coating stacks which help to achieve very high reflectivity at specific laser line wavelength at any designed angle of incidence. Laser line HR coatings are used for external beam manipulation applications where even slight losses may be intolerable. Coatings are provided by electron beam evaporation with/without ion assistance coating technique.
HR Broad Band Mirrors (BBHR Mirrors)
HR broad band mirrors (BBHR) provide high reflectance for a broad spectrum.
These multilayer coatings offers high reflectivity for broad spectrum. Therefore, it is the ideal for a wide range of multi-wavelength laser or white light applications.
Coatings are provided by Ion Beam Sputtering (IBS) or Electron beam evaporation with/without Ion assistance coating techniques.
HR dielectric coatings are available in the range of 0.19 - 20 m..
Metallic Coated Mirrors(MC Mirrors)
Metallic mirrors and partial reflectors
Photonchina has long been offering gold, silver, aluminum, chrome and copper metallic high reflection and partial reflection coated mirrors for customers home and abroad.
Photonchina metallic coated mirrors features:
Protected Gold provides excellent, broadband infrared high reflectance
Protected Silver provides higher reflectance than aluminum throughout the visible and near IR
Protected Aluminum is economical solution for VIS applications
UV enhanced Aluminum provides good reflectance over a wide range and are mainly used in UV applications.
Metallic Coated Mirrors Capabilities
Attribute Standard
Substrate material BK7, Fused Silica
Diameter tolerance +0.0, -0.1mm
Clear aperture >90%
Surface quality 40-20 scratch and dig
Surface irregularity /4 per 25mm@632.8nm
Parallelism for plano-flat of mirror 96.0%, Protected Gold
R>96.0%, Protected Silver
R>85.0%, Protected Aluminum
Photonchina s windows are used to isolate different physical environments while allowing light to pass. When selecting windows you should consider materials, transmission, scattering, wavefront distortion, parallelism and resistance to certain environments.
We offer a wide range of different materials and different degree of precision windows. Special materials are available upon requirement.
A broad range of single layer or multilayer antireflective coatings on optical windows are available.
N-BK7 Optical Windows
N-BK7,or H-K9L Chinese equivalent, is an excellent optical glass material for most visible and near infrared applications. It is the most common borosilicate crown optical glass, and it provides great performance at a good value. Its high homogeneity, low bubble and inclusion content, and straightforward manufacturability make it a good choice for transmissive optics.
UV Fused Silica Optical Windows
UV Fused Silica Windows feature low distortion, excellent parallelism, low bulk scattering and fine surface quality. This makes them perfectly suited for a wide variety of demanding applications, including multiphoton imaging systems and intracavity laser applications.
Calcium Fluoride Optical Windows
Calcium Fluoride optical windows are transparent from 180 nm to 8 �±�²�³�´�µm, making them ideal for applications such as spectroscopy or fluorescence imaging in the UV, visible, and IR wavelengths.
Sapphire Optical Windows
Uncoated Sapphire windows are ideal for harsh conditions, including environments subject to high temperatures, high pressures, strong vacuum, or corrosive atmospheres. Sapphire has high compressive strength and is resistant to attack from strong acid.
Wedged Windows
Photonchina high-energy laser wedge windows are specially designed to eliminate losses in vacuum cell applications and can be used as vacuum windows, convection barriers, or interferometer compensator plates.
Brewster Windows
When oriented at Brewster's angle (55.57�¬), s-polarized light is partially reflected, p-polarized light is transmitted without loss. When placed inside a laser cavity Brewster windows cause p-polarized light to have higher effective gain, resulting in the laser's final output being strongly p-polarized.
Photonchina Brewster windows are made of UV grade fused silica with laser grade surface quality and parallelism, making them ideal polarizers for use inside a laser cavity.
PHOTONCHINA WEDGE WINDOWS CAPABILITY
ATTRIBUTE PREMIUM
MATERIAL UV grade Fused Silica
DIAMETER TOLERANCE +0.0, -0.1mm
WEDGE 30 15 arc min
CLEAR APERTURE >90%
PARALLELISM
What are diffusion bonded crystals?
Diffusion bonded crystals are composed of a laser crystal and other undoped materials. They are optically contacted first and then bonded further under high temperature. Diffusion bonded crystals are able to significantly mitigate thermal lensing effect of laser crystals, thus providing integral components for compact lasers. Photonchina has been supplying standard assembly and special customized bonding crystals for customers in various applications. These diffusion bonded composite crystals have different wedge structures, Brewster angles, etc. It is mainly used to effectively reduce the thermal effect of solid-state high-power lasers.
Diffusion bonding production in Photonchina:
1)Optical contact between the crystals to be bonded.
2)Increase the temperature of crystals to 2/3 of the melting point in a gradual way and exert pressure to combine the two parts together.
3) Hold on the bonded crystals for a certain period at this high temperature, diffusion effect takes place.
4)Cooling slowly the crystals (24 hours) down to room temperature.
Products range of Photonchina:
1) YVO4+ Nd:YVO4 + YVO4; GdVO4+ Nd:GdVO4 + GdVO4;
2) YAG+Nd:YAG+ Cr4+:YAG; YAG+Nd:Ce:YAG+Cr4+:YAG; YAG+Yb:YAG+Cr4+:YAG
3) YLF+Nd:YLF+ YLF; YLF+Pr:YLF+ YLF
4) YAG+Ho:YAG+YAG; YAG+Tm:YAG+:YAG; YAG+Nd:YAG+ YAG
5) Tisapphire+Sapphire
6) KTP+ KTP
7ï¼?BBO Diffusion Bonded
Applications:
1)Industrial laser.
2)Biomedical laser, medical laser, beauty laser;
3)Semiconductor pump.
4)High-power operations.
5)Laser ranger finder.
6)High power laser system.
7)Laser Lidar.
Fabry Parot Etalon is a high-resolution interference spectrometer with wide applications, which include high-resolution spectroscopy, the study of spectral lines with very close wavelengths, such as the isotope spectrum of elements, the hyperfine structure of the spectrum, the small frequency shift in light scattering, the Doppler shift of spectral lines caused by atomic movement, and the internal structure shape of spectral lines.
It can also serve as a high demanding optical filter and a precision wavelength meter. In the laser system, it is often used to narrow the spectral line in the cavity or make the laser system operate in a single mode. It can be used as a bandwidth control and tuning device in broadband picosecond lasers to detect and analyze the spectral components in the laser (longitudinal mode, transverse mode).
Use of etalon and selection of substrate materials
Etalons, when used in transmission mode, have a series of transmittance peaks with periodic frequency spacing and are typically used in telecom for wavelength locking. Etalons are characterized by their Free Spectral Range (FSR) the frequency spacing between peaks and their Finesse which essentially governs the shape of the transmission peaks.
Etalon filters typically consist of a single spacer layer with two reflector stacks on either side.
For FSR values below 1000 GHz, the spacer is usually fabricated from a substrate material (rather than grown in thin film deposition). To achieve etalon quality polishing the parallelism of the substrate needs to be better than 1-5 arc-seconds.
Different substrate materials are chosen depending on the application fused silica is used when the etalon FSR and peak variation with temperature is to be minimized while Si is used when a high FSR temperature coefficient is required for thermal tuning.
Photonchina fabricates custom high quality fused silica and Si etalons at competitive prices with FSR values in the range of 12.5 GHz to 500 GHz.
Types of Etalon
The optical etalon can be a single-piece structure with parallel reflective surfaces, the solid-state etalon made of fused silica material, or an air-gap structure using a Fabry-Perot cavity double-reflective mirror, i.e., the air-gap etalon.
1. Solid Etalon:
Photonchina Specifications:
Material: H-K9L/BK7, Quartz Glass
Glan Taylor polarizer is made of two birefringent prisms that are assembled with an air space.
The polarizer with no side escape windows is suitable for low to medium power application where the side rejected beams are not required.
Photonchina Featureï¼?
Air-spaced
Close to Brewster's Angle Cutting
High Polarization Purity
Short Length
Wide Wavelength Range
Suitable for low to medium power application
1. Calcite Glan Taylor Polarizer
C.A. fa(mm) O.D. fd(mm) L �¯0.1(mm)
6.0 15.0 15.0
8.0 25.4 17.0
10.0 25.4 19.0
15.0 30.0 23.0
20.0 38.0 29.0
2. a-BBO Glan Taylor Polarizer
C.A. fa(mm) O.D. fd(mm) L�¯0.1(mm)
6.0 15.0 15.0
8.0 25.4 17.0
10.0 25.4 19.0
15.0 30.0 23.0
20.0 38.0 29.0
3. YVO4 Glan Taylor Polarizer
C.A. fa(mm) O.D. fd(mm) L 0.1(mm)
6.0 15.0 12.0
8.0 25.4 15.0
10.0 25.4 17.0
15.0 30.0 20.0
20.0 38.0 25.0
Rochon Polarizers
Rochon polarizer is made of two birefringent material prisms cemented or optically contacted together. The Rochon prism was invented by and is named after Abb Alexis Marie Rochon. It is in many ways similar to the Wollaston prism, but the ordinary ray passes through the prism undeviated. Any separation angle can be designed according to request of customers.
Features
Multiple Polarization Materials Available
Ordinary Rays Pass Through Undeviated
Extraordinary Rays Deviate
Photonchina Specifications
Material: a-BBO, Calcite, YVO4,Quartz,MgF2
Wavelength Range: a-BBO 190-3500nm,YVO4 500-4000nm
Quartz 200-2300nm Calcite:350-2300nm
Extinction Ratio: Quartz
High Transmission Polarizer
High Transmission Glan Laser Polarizers is a special type of Glan Laser Polarizers. Its incidence angle is brewster angle cut which can greatly improve the transmission ray up to 98% in a wide range of wavelength without coating. The polarizer can be made from Calcite or YVO4 crystals. In order to get transmission of a wide range of wavelength, the polarizers are not recommended to use for large acceptance angle. It is typically used at the angle within+/-5.
Photonchina Specifications
Material: Calcite or YVO 4
Wavelength Range: Calcite:350 2300 nm, YVO4:500 4000 nm
Extinction Ratio: Calcite:
Glan Laser polarizer is made of two same birefringent material prisms that are assembled with an air space. Photonchinas polarizer is a modification of the Glan Taylor type and is designed to have less reflection loss at the prism junction. The polarizer with two escape windows allow the rejected beam to escape out of the polarizer, which makes it more desirable for high energy lasers. The surface quality of these faces is relatively poor as compared to that of entrance and exit faces. No scratch dig surface quality specifications are assigned to these faces.
Photonchina Feature
Air-spaced
Close to Brewster's Angle Cutting
High Polarization Purity
Short Length
Wide Wavelength Range
Suitable for medium power application
Specifications
Material: a-BBO, Calcite or YVO 4
Wavelength Range: BBO:200 3500 nm, Calcite:350 2300 nm, YVO4:500 4000 nm
Extinction Ratio: Calcite:
Green Laser Module-Dot
Features:
Crystal-growing experience for 15years
Cost effective
High stability and reliability
Applications:
Laser pointer
Laser stage lights
Outdoor lawn lights
Specifications:
Items Parameters
Part No. LMGD-30/50/100
Wavelength (nm) 532+/-1nm
Transverse Mode Tem00
Output Power >30-100mW
Working Voltage 2V
Working Current 380-500mA
Beam Size (10m) 5000hrs
Warranty Period 6 months
Dimension D13*L30mm
Note: 1. Customized Sizes available upon request.
Green Laser Module-Line
Features: Crystal-growing experience for 15 years
Cost effective
High stability and reliability
Applications:
Laser Level Gauge
Marble cutting Positioning
Machinery Positioning
Specifications:
Items Parameters
Part No. LMGL-10/20
Wavelength (nm) 532+/-1nm
Line Power 10-20mW (+/-2mW )
Input Voltage DC 3.7V
Input Current 7-15mW
Input Voltage 3.0-5.0V
Input Current
Photonchinas wollaston polarizer can separate an incident beam into two rays: extraordinary and ordinary ray with a deviation angle which is dependent on wavelength. Both rays are transmitted through the other surface.
Specifications:
Material: a-BBO, Calcite ,YVO4,Quartz
Wavelength Range: a-BBO:190-3500 nm, Calcite:350-2300 nm, YVO4:400-5000 nm,Quartz:200-2300 nm
Extinction Ratio: Calcite,Quartz:
Photonchinas beamsplitters are used to split or combine beams of light. Plates are used for most laser applications as they exhibit low absorption. Cubes are a convenient, protected form for low power applications. The performance of a beamsplitter is mainly dependent on the coating specifications.
Non-polarizing beamsplitter (high power NPBS) is a kind of special polarizing beamsplitter. It makes the p-polarization component and S- polarization component of incident light have similar spectral characteristics.
The yttrium orthovanadate (YVO4) is a positive uniaxial crystal grown with Czochralski method. It has good mechanical and physical properties and is ideal for optical polarizing components because of its wide transparency range and large birefringence. Photonchina YVO4 has an excellent synthetic substitute for Calcite (CaCO3) and Rutile (TiO2) crystals in many applications including fiber optic isolators and circulators, beam displacers, Glan polarizers and other polarizing optics, etc.
Applications of YVO4ï¼?
YVO4 crystal produced by Photonchina is mainly used to manufacture Birefringent Wedge of optical isolator and Beam Displacer (BD) of optical circulator and optical beam splitter.
YVO4 Wedges or Prisms are also called YVO4 Plates or Blocks.
1. YVO4 Wedge, key components of optical isolator.
2.YVO4 BD, Beam Displacer, used in fiber circulator
Achromatic lenses are normally made of BK7, fused silica and CaF2.
Special focusing systems can be designed by Photonchinaâ??s engineer team.
Sizes from smallest diameter of 3mm to biggest of over 100mm are all available.
Normal Achromatic Lens
Super Small Achromatic Lens
Super small Achromatic Lenses for your specific application provide excellent wavefront quality, super small spot size and improved modulation transfer function (MTF).
Feature
Small diameter size up to 3mm
Short focal length, such as 5mm
Strict quality control, excellent quality
AR-coating, mounts services
Photonchina produces the smallest rod lenses for customers at home and abroad.
Micro rod lenses: 0.5-1.8mm diameter, 1.0-25mm length, with one end of designated curvature radius and another end of arbitrary angle.
Both ends of arbitrary radii or angle are also available. Highly customized products for a wide range of applications from medical device, fiber communications, optical display and surveying equipment.
What is more, we can provide unique rod-shaped glued lenses by combining special gluing/cementing technics and edging skill. These glued/cemented rod lenses subassembly can be made of up to four single micro rod lenses with various combination. Rod lens assembly systems are able to provide images with greater brightness, contrast and color reproduction than conventional lenses.
Rigid endoscope, for instance, which usually has a series of high-resolution optical glass rod lenses, can be forward viewing (0 degrees) or angled (10120 degrees) to allow visualization out of the axis of the telescope and increase the FOV by rotating the instrument. The optical quality of lens-generated images of rigid endoscopes still surpasses that of the fiber-optic or digital images produced by flexible scopes.
High performance optical coatings for rod lenses are provided.
Optical glass material NBK7, N-SF11 from Schott, Corning 7980 etc, are all available.
Material : N-SF11H-LaF53H-LaF76
Fused Silicon etc.
Radius of Curvaturemm R0.25R
Diametermm 0.5 5 Tolerancemm 0.005 0.05
Lengthmm L0.5 L30 Tolerancemm 0.020.06
Thickness tolerancemm 0.01 0.1 Surface Quality 10/580/50
Flaness /20/4 Off centering 110
Optical coating : Upon request
Micro Spherical Lenses
Under the condition of high refractive index, some optical components can achieve short focal length. Therefore, the micro lens becomes an ideal choice in the field of high precision applications.
Through years of accumulated processing know-how technologies and production capacity, high standard thin film coating performance and strict testing requirements, Photonchina provides customers with one of the world's smallest but excellent micro lenses products, which have been widely used in various medical devices (endoscope lens, for example), precision surveying and optical communications instruments.
From design, manufacturing to optical coating, from endoscope lens, capsule lens to special-required rod lens, from single mini lens to glued lenses system, engineers in Photonchina implement strict production process to ensure stable quality, competitive price as well as responsive lead time.
A variety of optical glass or other materials, such as BK7, N-SF11, H-LAF76, Fused Silica and so on are available for customers design. H-LaF53, for instance, has often been used in endoscope lens or capsule lens production. We have a wide range of lenses in shape: convex, concave, biconvex, meniscus etc.
Material : N-SF11H-LaF53H-LaF76
Fused Silicon etc.
Radius of Curvaturemm R0.25R
Diametermm 0.5 5 Tolerancemm 0.005 0.05
Lengthmm L0.5 L30 Tolerancemm 0.020.06
Thickness tolerancemm 0.01 0.1 Surface Quality 10/580/50
Flaness /20/4 Off centering 110
Optical coating : Upon request
Micro Lens (Ultra small lens)
Because of the ultra-small size of this kind of lens (outer diameter 0.5mm-5mm, length: 1mm-20mm), micro lens or ultra-small lens often requires special processing technology, unique production know-how and special optical fixture, etc.
Photonchina provides various sizes of micro lens with an array of applications including active devices, wavelength division multiplexer ( WDM) and fiber lasers (see C-lens, G-lens) in fiber communications, endoscopy for medical and industrial use, capsule endoscope, etc. Its new application fields are still expanding.
A variety of optical glass or other materials, such as N-SF11, H-LAF76, Fused Silica and so on are available for customerâ??s design. H-LaF53, for instance, has often been used in endoscope lens or capsule lens production. The outer diameter of micro lens covers 0.5mm to 5.0mm with any radius of curvature that can be made. We have a wide range of lenses in shape: convex, concave, biconvex, meniscus etc.
Photonchina can provide unique rod-shaped glued lens by combining special gluing technics and edging skill. This rod lens has excellent eccentricity and clear aperture index. From design, manufacturing to optical coating, from endoscope lens, capsule lens to special-required rod lens, engineers in Photonchina implement strict production process to ensure stable quality, good yield, competitive price as well as responsive lead time.
Photonchina has been focusing on dove prism manufacture for more than decades in order to meet demands of customers worldwide in applications ranging from image displaying to fiber communications.
Dove prism is a type of reflective prism which is used to invert an image. These prisms are shaped from a truncated right-angle prism. A beam of light entering one of the sloped faces of the prism undergoes total internal reflection from the inside of the longest (bottom) face and emerges from the opposite sloped face. Images passing through the prism are flipped, and because only one reflection takes place, the image's handedness is changed to the opposite sense.
If you look through the prism and rotate it around a longitudinal axis, the image rotates through twice the angle through which the dove prism itself rotates. For optimal performance, you may use dove prisms with collimated light. The top surface of each dove prism is ground and the longest length features an unbeveled sharp edge.
Dove Prisms are offered uncoated, with anti-reflection coated diagonal faces, or with aluminized diagonal faces. Aluminized dove prisms feature a protected aluminum coating with black Krylon paint on the diagonal faces and are ideal for displaced retroreflection. They provide a u-turn for incident laser beam light.
Zero Order Waveplate
The zero order waveplate is designed to give a retardance of zero full waves, plus the desired fraction. Zero order waveplate shows better performance than low/multiple order waveplates. It has broad bandwidth and a lower sensitivity to temperature and wavelength changes. It should be considered for more critical applications.
It is constructed of two low order waveplates with their axes crossed. Thus,the effect of the first plate is canceled by the second,except for the residual difference between them. There are normally three different structures as follows,
Optical Contact
Cemented by Epoxy
Air spaced
Low Order Waveplate
Low(multiple) order waveplate is designed to give a retardance of several full waves, plus the desired fraction. This result in a single, physically robust component with desired performance. However, even small changed in wavelength or temperature will result in significant changes in the desired fractional retardance. They are less expensive and find use in many applicatios where the increased sensitivities are not an important.
Photonchinas waveplates fabrication starts from quartz materials cutting with their axes oriented within a few arcminutes before being polished to a laser-quality finish, arcsecond parallelism, and
Roof Prism
A roof prism is a reflective optical prism to make two cross beams be parallel with each other. It contains a section where two faces meet at a 90 angle. These two 90 faces resemble the roof of a building, giving this prism type its name. Reflection from the two 90�° faces returns an image that is flipped laterally across the axis where the faces meet.
In some cases, passing through the prism, the image is both deflected right-to-left and top-to-bottom. The hypotenuse of the prism utilizes total internal reflection (TIR) to reflect the image through the prism. Polarization states may become rotated during reflection.
As a rich experienced manufacturer, substrate material in Photonchina can be chosen from all optical glasses (N-BK7, for instance), Fused Silica, Si, ZnSe, ZnS, CaF2, MgF2 etc.
Wavepalte Types:
Photonchinas waveplates include octadic waveplate (1/8 waveplate),quarter waveplates(1/4 waveplate), half wave plates(1/2 waveplate) and full waveplate
Both circular aperture and quadratic aperture are available.
Photonchinaâ??s waveplate can transmit light and modify its polarization state without attenuating, deviating, or displacing the beam.It is ideal for applications requiring high damage thresholds and retardation stability over temperature change, such as for use with lasers or infrared light sources.
Achromatic Waveplate
Achromatic waveplate is made from two different substrate materials such as crystal quartz and magnesium fluoride. For the single material,waveplateâ??s working wavelength is very limited because of the dispersion of the material. But Achromatic Waveplate uses two different kinds of materials,with the different dispersion, such waveplate is not sensitive to the wavelength change.
Dual Wavelength Waveplate
Dual wavelength waveplate is a special type of multiple waveplate that provides a specific retardance at two different wavelengths, itâ??s particularly useful when used in conjunction with other polarization sensitive components to separate coaxial laser beams of different wavelength. It is widely used to improve conversion efficiency in solid double frequency laser device.
Polarization Rotator
Due to the rotation activity of natural quartz crystal, it also can be used as polarization rotators so that the plane of input linearly polarized beam will be rotated at special angle which is determined by the thickness of quartz crystal.
