Optical Components: Optical lenses, Optical filter, Laser optics

Laser Module

Egismos optics offer a wide range of optical components and electro-optical solutions, including spherical lenses, aspheric lenses, collimating lenses, laser collimators, coupling lenses, fiber coupling lens, laser optics (laser collimating lens, laser coupling lens, laser line generator lenses...), optical filters (UV filters, infrared filters, bandpass filters...), and diffractive optical elements (DOE). We also offer customization services and provide optical design for any kind of application. Please contact us for more inquiries about our optical devices.

EGISMOS Optics proposes a large offer of off-the-shelf optical components, which includes an extensive selection of stock optical lenses, such as spherical lenses, aspheric lenses, camera lenses or optical filters. Many of EGISMOS Optical lenses are provided with a variety of coating options for the Ultraviolet (UV), visible, or Infrared (IR) spectrums. The spherical lenses such as the Plano-Convex (PX) or Double-Convex (DX) lenses enable light to focus to a point; while the Plano-Concave (PV) or Double-Concave (DV) lenses will allow the light traveling through the lens to diverge.

Plano Convex Glass Lenses
Plano Convex Lens
Product Φ R1 R2 EFL Tc Te Datasheet Buy
O1-PX-10-15-G 10 Infinity -7.78 15 2.27 1.5
O1-PX-10-22-G 10 Infinity -11.4 22 1.79 1.5
O1-PX-10-30-G 10 Infinity -15.56 30 3 2
O1-PX-10-40-G 10 Infinity -18.2 40 3 1.8
O1-PX-10-45-G 10 Infinity -20.8 45  2.6 1.9
O1-PX-25-34-G 25 Infinity -17.61 34 6.5 1.3 Sperical Lens Plano Convex Lens
O1-PX-25-50-G 25 Infinity -25.9 50 5.7 1.5
O1-PX-25-63-G 25 Infinity -32.4 62.5 4 2.5
O1-PX-25-75-G 25 Infinity -38.9 75 4 1.9
O1-PX-25-100-G 25 Infinity -51.9 100 4 2.5

 

Double Convex Glass Lenses
Sperical Lenses Double Convex Lens
Product Φ R1 R2 EFL Tc Te Datasheet Buy
O1-DX-10-8-G 10 7.45 -7.45 8 4.5 1 Sperical Lenses Double Convex Lens
O1-DX-10-10-G 10 9.55 -9.55 10 4 1.25
O1-DX-10-12-G 10 11.91 -11.91 12 3 0.8
O1-DX-10-18-G 10 18.2 -18.2 18 2.8 1.4
O1-DX-10-25-G 10 25.5 -25.5 25 2.4 1.4
O1-DX-25-33-G 25 33 -33 33 7 2.1 Sperical Lenses Double Convex Lens
O1-DX-25-40-G 25 40.4 -40.4 40 6 2
O1-DX-25-45-G 25 45.8 -45.8 45 5 1.5
O1-DX-25-52-G 25 53.1 -53.1 52 5 2
O1-DX-25-58-G 25 59.4 -59.4 58 4.5 1.8

 

Plano Concave Glass Lenses
Sperical Lenses Plano Concave Lens
Product Φ R1 R2 EFL Tc Te Datasheet Buy
O1-PV-10-15-G 10 -7.8 Infinity -15 2 5.27 Sperical Lenses Plano Concave Lens
O1-PV-10-20-G 10 -10.4 Infinity -20 2 4.17
O1-PV-10-25-G 10 -13.0 Infinity -25 2 3.7
O1-PV-10-40-G 10 -20.8 Infinity -40 2 3
O1-PV-10-50-G 10 -25.9 Infinity -50 2 2.79
O1-PV-25-38-G 25 -19.5 Infinity -37.5 2 6.4 Sperical Lenses Plano Concave Lens
O1-PV-25-50-G 25 -25.9 Infinity -50 2 4.6
O1-PV-25-63-G 25 -32.4 Infinity -62.5 2 4.4
O1-PV-25-75-G 25 -38.9 Infinity -75 2 4
O1-PV-25-100-G 25 -51.85 Infinity -100 2 3.2

 

Double Concave Glass Lenses
Sperical Lenses Double Concave Lens
Product Φ R1 R2 EFL Tc Te Datasheet Buy
O1-DV-10-15-G 10 -15.9 15.9 -15 2 4.9 Sperical Lenses Double Concave Lens
O1-DV-10-20-G 10 -21.1 21.1 -20 2 4.07
O1-DV-10-25-G 10 -26.3 26.3 -25 2 3.62
O1-DV-10-30-G 10 -31.5 31.5 -30 2 3.33
O1-DV-10-40-G 10 -41.9 41.9 -40 2 3
O1-DV-25-25-G 25 -24.7 24.7 -25 2 9.02 Sperical Lenses Double Concave Lens
O1-DV-25-32-G 25 -31.5 31.5 -30 2 7.34
O1-DV-25-35-G 25 -35.1 35.1 -35 2 6.76
O1-DV-25-50-G 25 -50.9 50.9 -50 2 5.22
O1-DV-25-75-G 25 -77.1 77.1 -75 2 4.11
Optics Product ID Naming Rule:
Example: O 1 CO 7 8.9 A
Product Code of Optics Number of Lenses Lens Type Lens Diameter (mm) EFL or NA Material & Process
O: Optics 1: singlet DX,DV: double convex, concave 10: 10mm EFL: effective focal length A: aspheric glass lenses
  2: glue coupling lens or doublet lenses PX,PV: plano convex,concave 25: 25mm NA: numerical aperture G: spheric glass lenses
  3: triplet lens or three lenses set       H: hybrid lenses
  4: four lenses set       P: plastic lenses

EGISMOS off-the-shelf aspheric lenses are laser collimators or laser collimating lenses, laser coupling lenses or fiber coupling lenses. A collimating lens helps a divergent light traveling through the lens to converge as a collimated beam (a non-divergent light). This property is usually used for laser diode collimation or light collimating applications. The coupling lenses are mostly used for coupling lasers to fibers for a divergent light to focus to a point into the fiber, like laser diode to fiber coupling or fiber to fiber coupling. We also provide aspheric lenses for custom designed service, don't hesitate to contact us at: sales@egismos.com

Collimating Lens
Collimating Lens
Product Φ NA EFL BFL CA Datasheet Buy
O1-CO-2.5-1.4-A 2.5 0.52 1.4 1.06 1.44
O1-CO-3-3.8-A 3.0 0.33 3.77 2.99 2.5
O1-CO-3-4.5-A 3.0 0.3 4.5 3.46 2.7
O1-CO-3-6-A 3.0 0.22 6.0 5.2 2.7
O1-CO-4-4-A 4.0 0.4 4.0 2.92 3.2
O1-CO-5.5-8.8-A 5.5 0.25 8.8 7.3 4.6
O1-CO-6.3-9.8-A 6.35 0.27 9.85 8.26 5.4
O1-CO-6.5-8.9-A 6.5 0.3 8.9 7.55 5.3
O1-CO-6.5-12-A 6.5 0.21 12.0 10.55 5.0
O1-CO-8-11.2-A 8.0 0.3 11.2 9.7 6.5
O1-CO-10.5-15.2-A 10.5 0.3 15.18 13.48 9.0
Coupling Lens
Coupling Lens
Product Φ NA EFL BFL CA Datasheet Buy
O1-CP-1.7-1.1-A 1.7 0.4/0.16 1.11 1.1/3.77 1.1/1.36
O1-CP-5.2-2.9-A 5.2 0.45/0.21 2.97 2.86/7.4 3.9/4.6
Optics Product ID Naming Rule:
Example: O 1 CO 7 8.9 A
Product Code of Optics Number of Lenses Lens Type Lens Diameter (mm) EFL or NA or angle Material & Process
O: Optics 1: singlet CO: collimator 2.4: 2.4mm EFL: effective focal length A: aspheric glass lenses
  2: doublet lens or two elements system CP: coupling lens 6.3: 6.3mm NA: numerical aperture G: spheric glass lenses
  3: triplet lens or three elements system LG: Line Generator 6.5: 6.5mm   H: hybrid lenses
  4: four elements system CG: Cross Line Generator 8: 8mm 100: 100 degrees P: plastic lenses
  5: five elements system RO: Rod Lens   360: 360 degrees  
  E: Element CY: Cylindrical Lens      

Many optical systems require filters in order to work with specific range of wavelengths, and Egismos has therefore developed a comprehensive selection of standard as well as custom filters for any requirement. Whether it is for transmitting specific wavelengths or blocking others, Egismos UV pass filters, UV cut filters, Infrared pass filters, Infrared cut filters or bandpass filters are optimized for all kinds of applications.

BandPass Filter
BandPass Filter
Product Wavelength FWHM Specification Size Datasheet Buy
OF-BP-635-d1-B 635 50nm CWL:635+/-10nm FWHM:50+/-10nm Tpeak>85% OD2@400~1100nm 123×100×1.1mm BandPass Filter BandPass Filter
OF-BP-650-c8-B 650 60nm CWL:650+/-10nm FWHM:60+/-10nm Tpeak>85% OD2@400~1100nm 81×81×1.1mm BandPass Filter BandPass Filter
OF-BP-810-c5-B 810 60nm CWL:810+/-10nm FWHM:60+/-10nm Tpeak>85% OD2@400~1100nm 55×55×1.1mm BandPass Filter BandPass Filter
OF-BP-850-c5-B 850 50nm CWL:850+/-10nm FWHM:50+/-10nm Tpeak>85% OD2@400~1100nm 55×55×1.1mm BandPass Filter BandPass Filter
Window Glass
Window Glass
Product Feature Size Thickness Material Datasheet Buy
OW-NC-R08-03-O No Coating Round 8mm 3mm Optical Glass Window Glass Window Glass
Optics Product ID Naming Rule:   Example:OF-BP-650-d1-B
Product Code of Optics Filter Code Central Wavelength Size FWHM
OF: Optical Filter BP: Bandpass Filter
IP: IR Pass
IC: IR Cut
UP: UV Pass
UC: UV Cut
400
650
700
808
1050
.
.
.
Diameter
R1: 12.5mm
R2:  25mm
RX:  Custom

 

 

Square
 m5: 5*5mm
 c1: 10*10mm
 c2: 20*20mm
 d1: 100*100mm
 SX: custom
N: Narrow band = FWHM<10nm

 


S: Standard band=10<FWHM<40nm

 

B: Broadband= 40<FWHM<70nm

 

E: Extra Broadband= FWHM>70nm

 

         
OW: Window Glass Feature Size  Thickness Material 
  AR: Anti Reflection coating
NC: No Coating
IP: IR Pass
IC: IR Cut
UP: UV Pass
UC: UV Cut
Diameter
R08: 8mm
Square
S05: 5*5mm
03: 3mm S: Sapphire
Q: Quartz
O: Optical Glass
P: Plastic

Diffractive Optical Elements (DOE) are nowadays one of the best solutions for laser systems to generate a huge variety of patterns for industrial applications. DOEs can reach very thin thicknesses, high compactness and very light weight compared to other traditional optical components. Moreover, the use of DOE enables the projection of highly straight, uniform and precise lines of laser patterns. Egismos now provides various kinds of high quality DOEs with high resolution, and also designs customized DOE upon inquiries.

View Finder
Diffractive Optical Elements View Finder
Pattern: View Finder
Size (LxWxT): 4x3x0.55 (mm)

Material: Glass/Poly(methyl methacrylate) (PMMA)
Wavelength:635nm
Pattern Angle a: 15°
Pattern Angle b:10°
Pattern Angle c: 5°
O-DE-R-43-V-1-P Diffractive Optical Elements View Finder

 

Target
Diffractive Optical Elements Target
Pattern: Target
Size (LxWxT): 4x3x0.55 (mm)

Material: Glass/Poly(methyl methacrylate) (PMMA)
Wavelength:635nm
Pattern Angle a: 20°
Pattern Angle b: 10°
O-DE-R-43-T-1-P Diffractive Optical Elements Target

 

Matrix
Diffractive Optical Elements Matrix
Pattern: Matrix (51*51 dot)
Size (LxWxT): 4x3x0.55 (mm)

Material: Glass/Poly(methyl methacrylate) (PMMA)
Wavelength:635nm
Pattern Angle a: 20°
Pattern Angle b(Adjacent Dots):0.4°
O-DE-R-43-M-1-P Diffractive Optical Elements Matrix

 

Round
Diffractive Optical Elements Round
Pattern: Round
Size (LxWxT): 4x3x0.55 (mm)

Material: Glass/Poly(methyl methacrylate) (PMMA)
Wavelength:635nm
Pattern Angle a: 1m@10m(5.72°)/ 10°
O-DE-R-43-R-1-P Diffractive Optical Elements Round
O-DE-R-43-R-2-P Diffractive Optical Elements Round

 

Cross
Diffractive Optical Elements Cross
Pattern: Cross
Size (LxWxT):4x3x0.55 (mm)

Material: Glass/Poly(methyl methacrylate) (PMMA)
Wavelength:635nm
Pattern Angle a: 5°/10°/15°
O-DE-R-43-C-1-P Diffractive Optical Elements Cross
O-DE-R-43-C-2-P Diffractive Optical Elements Cross
O-DE-R-43-C-3-P Diffractive Optical Elements Cross

 

Line
Diffractive Optical Elements Line
Pattern: Line
Size (LxWxT): 4x3x0.55 (mm)

Material: Glass/Poly(methyl methacrylate) (PMMA)
Wavelength:635nm
Pattern Angle a: 30°/ 60°
O-DE-R-43-L-1-P Diffractive Optical Elements Line
O-DE-R-43-L-2-P Diffractive Optical Elements Line
DOE Product ID Naming Rule:
Example: O DE R 43 L 1 G
Product Code of Optics Lens type Element Shape Lens diameter Pattern NA Material 
O: Optics DE: DOE - Diffractive Optics Element S:Square 4: 4x3 L: Line DOE Part Number G: Glass
    R: Rectangular 6: 6x6 R: Round   P:Plastic
    C: Circular   C: Cross    
        M: Matrix    
        V: View finder    
        T: Target    
Optical Design Service, Opto-Electronics Integration and Manufacture

If you look for a team specialized in optical system design and prototyping, we can provide all the services you need, ranging from custom lens design, to opto-mechanical, electronics design, engineering integration or production. Drawing from many years of optical design experience and the know-how of our team of 30 engineers - including 5 PhD’s in optics, mechanical, and electrical engineers, and CAD designers, you can expect us to deliver world-class system designs. We can support your requirements for lens design, optical analysis, optoelectronic modules and other related resources for your SBIR / DoD / DARPA programs.

Our experience is transferable over a wide variety of commercial applications. Here is a short list of EGISMOS successful projects:

.Laser Applications: Laser Module, Fiber Coupled Laser, Fiber Laser

.DOE Laser Pattern and Recognition: Laser Keyboard, Laser Keypad, Gesture/Express Recognition

.Laser MEMS Scanning Module: Laser Projector, Laser Target Tracking, Laser Marking, Biomedical DNA Chip Inspection, Laser Printer Engine

.Laser Distance Measurement Module: Laser Distance Meter, LIDAR Sensing

.Illumination Design, Reflectors, and Collimators including LED, Laser

.Camera Module, Camera Lenses, Image Processing, Image Recognition Robotics, IR Systems, Night Vision, Motion Capture

.Video Games and Optical Toys

.3D displays, Micro Projector, HUD Display

.Custom Lenses, Coating Filter, Optical Components Design and Development

Optical Design and Prototypes

Available services and products: Ray Tracing, evaluation and correction of aberrations, special single elements, achromats, optical filters, lens assemblies. We will design, engineer, and procure lenses, mirrors, window, prisms etc. according to your specifications.

Opto-Mechanical Design, Fabrication and Assembly

We design and fabricate all of our own prototype instrumentation and opto-mechanical devices, including tooling and fixtures. As a company specializing in the manufacture of optical instruments, particular attention is paid to quality assurance and process control. We use simple, elegant, and cost-efficient solutions for customized and semi-customized instruments.

Opto-Electronics Systems

EGISMOS produces a great number of "Semi-Customized" instruments, particularly for critical quality and process control applications which frequently require one-of-a-kind instrumentation to be designed for specific purposes. We offer many years of experience in the design and fabrication of high precision opto-mechanical devices and opto-electronic systems.

Our other services, including Optical Design, Electronic Circuit design and Prototyping make us your one-stop provider of unique engineering solutions to your instrumentation problems. For more information, contact us at sales@egismos.com

Optical Design to Manufacturing for ODM/OEM

EGISMOS has high level manufacturing capacities for glass optics, plastic optics, hybrid optics, fiber optics, diffractive optical elements, coatings and integration at our facilities. We have a multi talented engineering team comprising optical, mechanical, electronics, materials and process engineers.

We take advantage of the variety of capabilities and skills of our team and of our engineering associates to help our customers at every step of a product realization process: from design to prototyping, up to bulk manufacture. We take a great care of the intellectual property rights of our customers.

Hybrid Optical Lens Process

EGISMOS uses the glass replication technology to manufacture hybrid optics. The process consists in replicating a layer of liquid polymer that is UV curable on a glass surface. The glass replication technology is a cold process that can be performed at room temperature. It is the most flexible and cost effective solution for designing specific optical functions, such as astigmatism, since any kind of shape can be designed on an optical surface thanks to this process.

To sum up: our hybrid lenses combine the quality standards of the glass molded lenses with the cost efficiency of the plastic lenses.

Advantages of glass replicated aspherical lenses:

Spherical Lenses

The spherical lenses are the most common type of optics. They show at least one surface that is a segment of a ball.

EGISMOS designs and manufactures standard and custom spherical optics to fit any kind of application. From singlet and doublet optical lenses to ball lenses and condenser lenses, our spherical optics will meet all your needs. Our team of experts in optical design and manufacturing is experienced in developing customized solutions with custom sizes and shapes, specific optical coatings, or any other modification.

Types of Lenses

Referenced below is some helpful technical information including lens types and terminology definitions. Use these guides in addition to the magnifiers recommendations below to help you choose the correct magnifier.

Simple Positive Lens - A single piece of optical glass or acrylic with two convex surfaces (curved outward). Designed for low magnification.

 

Simple Negative Lens - A single piece of optical glass or acrylic with two concave surfaces (curved inward). Used in conjunction with positive lenses.

 

Achromatic Lens - A positive simple lens cemented to a negative simple lens.Achromatic lenses are corrected for two colors and produce flatter fields of view at higher powers.

 

Double Lens - Two simple lenses used as a system but not cemented together. This system produces a far superior image than a simple lens.

Aspheric Lenses

Aspheric lenses have one or more optical surfaces of non-constant curvature. They are used to avoid aberrations existing in spherical lens systems, and to reduce the optical systems overall dimensions and weight.

One of the benefit of aspheric lenses is to correct the spherical aberration. Spherical aberration happens when focusing or collimating light through a spherical surface: all spherical surfaces will produce such spherical aberration regardless of the alignment or the manufacturing errors. Through the adjustment of the parameters of the lens, such as the conic constant and the aspheric coefficients, the aspheric lenses are designed to minimize the spherical aberration. The throughput of aspherical systems is also improved thanks to additional aberration corrections, thereby achieving low f/# and high numerical aperture values, without decreasing the image quality.

The correction of aberration using aspheric optical systems also allows the use of fewer optical elements than in spherical systems thanks to improved aberration correction compared to the latter. The multiplicity of optical elements in one system has a negative influence on other parameters (both optical and mechanical), thereby decreasing the tolerances and complexifying the alignment procedures, as well as requiring higher quality surface coatings. These influences will affect the systems efficiency, their size and their costs. Therefore aspheric system that may seem more expensive at first would actually be more cost-efficient for your applications.

Specifying Aspheres

In order to design an aspheric lens, many parameters need to be specified. We first need the custom aspheric form, that is often mathematically described with the Forbes Q Polynomial (Figure 1) or the Even Aspheric Equation (Figure 2). These equations both require to define the Vertex Radius (I/C), the Conic Constant (k) and Aspheric Coefficients (a). Additionally, a Sag Table (Figure 3) is used as a reference to check the compativbility between different manufacturing or metrology tools used.

Free Form Lenses

The use of free form lenses can bring many benefits, such as beam shaping, coma corrections, astigmatism or wave front corrections in the optical path. The free form lenses can optimize the coupling efficiency of a laser diode into a fiber thanks to their abilities of converting oval beams into laser round spots.

Any kind of shape can be replicated on any optical flat or curved surface. Common free form shapes comprise beam shaping lenses (surface looking like a saddle). Free-form lenses can be produced through glass replica technology for a minimal cost since the most expensive mold required for the master glass lens only needs to be designed once. EGISMOS proposes services for plastic molding and two kinds of technology of glass replica for the manufacture of free-form lenses.

Electro-Optical and Opto-Mechanical Assembly

EGISMOS multi talented teams provide services of design and manufacturing of complex electro-optical systems from mere concepts to end products. We have a special attention for the field of biomedical applications and integration processes, detection and surveillance systems (night security, 3D imaging or scanning modules) and new technologies for gesture recognition. Egismos has an advanced class 100,000 to class 1000 clean room for the assembly of our most sensitive products, with all the necessary controls for particles, temperature, humidity, and ionization. All our facilities have protection against ESD and we implement strict laser handling procedures so as to deliver the best integrated electronic, mechanical, and optical assemblies.

EGISMOS supplies custom-built opto-mechanical assemblies, either static mounted optics or fully integrated optical components in moving mechanical assemblies. We work closely with our customers and industry-leading optics suppliers in order to get a thorough understanding of the applications of each assembly. Thanks to our experience in assembling optical and mechanical elements, we are able to reach the most accurate positioning and ensure the most robust performances of optical assembly in mechanical systems.

Once optics have be received at our facility, they undergo "scratch" and" dig" inspection in accordance with ISO 10110. The inspection is undertaken following our customer requirements: either sampled inspection, or 100% of the received components are checked. Our procedures and equipments are set up along with our customers to ensure that the optical components won't be subject to latent failure during later working operation. High quality has a cost and require special consideration when integrating mechanics and optics. All optical devices are highly sensitive to contamination therefore we use specific equipment, production methods and adapted test facilities. We design customized tooling and test equipment in order to carefully manage the key features of each product and have a smooth manufacture flow, thereby ensuring the utmost quality.

※More manufacturing services: http://www.egismos.com/photonic-design.html

Spherical Lens FAQ

What is a Spherical Lens

A spherical lens is a lens whose surface is a portion of a sphere. Spherical lenses can be classified into six categories: double convex, plano convex, positive meniscus, negative meniscus, plano concave and double concave lens.

What is the Focal Length (or Effective Focal Length)?

The focal length, if not specified, mostly means the Effective Focal Length (EFL) of one optical system. It is defined as the distance from the principle plane of the optical system to the focal point along the optical axis.  The effective focal length is a value which stands for how powerful one system can bend a light beam.

What is the Back Focal Length?

The Back focal length is defined as the distance from the vertex of the last optical surface of one system to its rear focal point along the optical axis. It is also called “working distance”.

Functional Lens FAQ

what is an Aspherical Lens?

An Aspherical lens is a lens with a special surface which radius of curvature varies with respect to the distance from the optical axis. Its surface can be a slightly modified spherical portion or resulting from a more complex surface function, such as parabolic, elliptic, etc.

What is the Numerical Aperture?

The numerical aperture (NA) is the measurement of how large an angle of a light cone is for one optical system to accept incident light or emit transmitted light. The Numerical Aperture is defined as N.A. = n * sin(θ), where n is the refractive index of the medium wherein the light is propagating and θ is the maximal half-angle of the light entering or exiting the optical system. The Numerical Aperture is dimensionless.

What is the Divergence Angle?

The divergence angle of a laser beam is the angle measured when a beam expands from its optical axis. A well designed and precisely manufactured collimator lens will convert a divergent laser source into a good collimated beam with the smallest divergence angle possible.

Filters FAQ

What is a Bandpass filter:

Band pass filters are filters that transmit only a specific range of wavelengths of the light spectrum. They are defined with a Central Wavelength (CWL) which is the center of said transmitted band and a FWHM (Full Width at Half Maximum) which corresponds to the effective width of the transmission band.

 

 

What is a cut off filter (eg: UV cut filter or IR cut filter) ?

UV cut off filters are filters designed to stop all wavelengths in the range of the UV spectrum. UV cut filters have a cut off wavelength, which is the wavelength at which the transmission is half of the maximal transmission. Below this cut off wavelength, the ultraviolet wavelengths are blocked and above this cut off wavelength, the visible light is transmitted. 

On the other side of the spectrum, IR cut off filters will transmit the visible light and block all wavelengths in the infrared spectrum above their cut off wavelengths. 

What is a pass filter (eg: UV pass filter or IR pass filter) ?

UV pass filters are designed to transmit only wavelengths in the ultraviolet spectrum and not the visible spectrum. Each filter has a cut off wavelength (CWL) that defines the limit between the transmitted and the blocked wavelengths. UV filters are a kind of short pass filters, eg: the filter transmit shorter wavelengths and block longer wavelengths according to their CWL.

On the other side, IR pass filters will transmit only infrared wavelengths and not the visible spectrum. IR pass filters are a kind of long pass filters, eg: the filters transmit longer wavelengths and block shorter ones according to their CWL.

DOE FAQ

What are Diffractive Optical Elements (DOE)?

Diffractive Optical Elements are elements with micro-structured surfaces that use their surfaces light diffractive properties and Fourier transforms to produce specific patterns.

The micro-structured surface of a Diffractive Optical Element is etched in silica, glass or polymer materials and comprises several layers to achieve more complicated patterns.

 


(micro-structured surface of a DOE)

 

What is Diffraction?

According to Huygens' principle, every point on an incident wave front arriving at an aperture is a source of secondary waves.
Diffraction occurs when a wave encounters an obstacle or a slit that is comparable in size to its wavelength and therefore produce diffraction patterns.

What is Diffraction Efficiency?

Diffraction efficiency is the performance of a diffractive optical element in terms of power throughput.

It measures how much optical power is diffracted into a designated direction compared to the power of the incident light gathered onto the diffractive element.

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