Achromatic Lenses

 Achromatic Spherical Lenses, Cemented Lenses, Bonded Lenses, Doublet, Triplet

 

With over a decade of production experience, we have significantly improved our achromatic spherical and cylindrical lenses manufacturing. From the beginning stage during evaluation, we help customers with material selection for cemented elements, thoroughly analyze potential production risks, and assess the cementing precision definition of the prints.

 

We are able to provide flint and crown glasses bonding solution with meniscus elements edged on optical edging device with precision wedge control. Our production team is also specialized in doublet and triplet fabrication with calcium fluoride (CaF2) lenses, which require special adhesive treatment for extended durability.

 

Our bonding operators carefully pair the individual lenses regarding radius (power), center thickness (CT) to ensure adhesive thickness and accurate CT control for high-precision requirement. We utilize UV curing / cold bonding techniques on different glass materials in order to enable operators eliminating center deviation on upgraded centering station. For doublet and triplet diameters exceed one inch, 0.6 arc min to 0.8 arc min is our standard wedge control precision.

 

We can precisely control the center thickness of doublets to within +/-0.04mm, triplet within +/-0.05mm for airspace sensitive design. A design that includes OHARA and SCHOTT glasses typically take longer due to material supplier’s lead time (>6 weeks); our engineering team can speed up the procurement process by helping you select compatible materials from our glass inventory database and dramatically reduce lead time to within one week to have the substrates ready.

 

Hyperion Optics is a leading optics supplier, we provide super achromatic lens, achromatic lens design, achromatic combination of lenses, achromatic design, optical assembly manufacturing and etc. Contact us to know the details of achromatic lens definition.

 

Round Concave Mirriors

Round concave mirrors are catoptric imaging. Mirrors( including convex) are reflecting back for imaging rather than get through the light, ray of light follows the law of reflection, that is what we called convergence. They always gather the light that shoot to the surface, ray of light that is entered parallelly will be focus on the spot again, ray of light is reflected from different angles because of different directions of surface normal. Round concave mirrors can not only focus parallel ray of light on the spot but also reflect parallel light from spot.

 

The diagram of a round concave mirror shows focus, focal length, centre of curvature and principal axis. Concave mirrors or gathering mirrors will deflect reflected ray of light. Concave mirrors will have different images because of the different distance between objects and mirrors, which is different from convex mirrors.

 

Round concave mirrors don’t have chromatic aberration because they are catoptric imaging, this advantage is can’t be compared with any lens. The resolution ratio is in direct proportion to the clear aperture of objective, it is difficult for the production of large aperture lens while concave mirrors that made according to reflection principal are easier. Therefore, round concave mirrors are always used for producing telescope.

 

If you are looking for a reliable optical assembly manufacturing company, please contact us, and we will be your best partner.

 

Diamond Lens Makes Laser Optical Material Processing System Lighter

Diamond has some remarkable properties: for example, its refractive index is 2.4, which is very high, and can be made into thinner optical components for optical systems with the same optical power. Their thermal conductivity is 2000 W/m*K, 1400 times higher than that of optical glass.

 

So far, polycrystalline diamond substrates have only been used as light windows for carbon dioxide lasers. Due to impurities and defects, they absorb and scatter laser radiation at the emission wavelength of 1 micron, so they are not suitable for fiber lasers. Although single crystal diamonds do not have this problem, they are difficult to manufacture. Over the years, the German Fraunhofer Institute for Applied Solid State Physics (IAF) has been devoted to the production of single crystal diamond. The continuous vapor deposition (CVD) reaction chamber developed in IAF has stable plasma conditions and it can produce a substrate with a thickness of several millimeters.

 

It can simultaneously process 60 diamonds at most. At a rate of up to 30 microns per hour, the reaction chamber can produce an optical element with an aperture of about 10 millimeters.

 

The lenses made of these synthetic single crystal diamonds have low absorptivity and low birefringence. At present, some samples coated with antireflection film have been provided and used in fiber hyperion laser cutting head. "We have optimized a complete laser optical system for diamond lenses for the first time, and the weight of the cutting head has been reduced by 90%," said Martin Traub of the Fraunhof Institute of laser technology".

 

The lens with a diameter of 7mm has passed the test of 2 kW laser power, without any problems. Now, partners have built a cutting test system using 1kW fiber lasers. Water cooling and protective gas supply are integrated in the cutting head. Process monitoring has not been planned. Currently, compact cutting heads is in process of testing for the first time.

 

A new optical system will significantly enhance the flexibility of laser cutting. The small size enables the system to process inaccessible areas, while the low weight is beneficial to the high dynamic motion in the 3D process.

 

As a professional optical assembly manufacturing company, we will do our best to meet all the needs of clients.

 

Basic knowledge of aspheric lens technology

1、Technical principle

 

The curvature radius of the aspheric lens changes with the center axis. It can be used to improve optical quality, reduce the number of optical components and reduce design costs. Compared with spherical lens, plastic aspheric lens has unique advantages, so it has been widely used in optical instrument, image and photoelectron industry, such as digital camera, CD player and high end micro instrument.

 

2、Comparative advantage

 

a, Spherical aberration calibration

 

The most remarkable advantage of aspheric lenses in replacing spherical lenses is that they can correct the spherical aberration caused by spherical lenses in collimating and focusing systems. By adjusting the surface constant and the aspheric coefficient, the aspheric lens can eliminate spherical aberration to the maximum extent.Aspheric lenses (rays converge to the same point and provides optical quality) basically eliminate spherical aberrations produced by spherical lenses (rays converge to different points and leads to blurred imaging).

 

Three spherical lenses are used to increase the effective focal length, which can be used to eliminate spherical aberration. However, a aspheric lens (high numerical aperture, short focal length) can be realized, and it can simplify the system design and provide the light transmittance.

 

b, System advantages

 

The aspheric lens simplifies the elements involved in optical engineers to improve the optical quality and improves the stability of the system.For example, in zoom systems, 10 or more lenses are normally used (additional: high mechanical tolerances, additional assembly procedures, and the improvement of antireflection coating). However, one or two aspheric lenses can achieve similar or better optical qualities. This reduces the system size, increases the cost rate and reduces the overall cost of the system.

 

3, Moulding techniques

 

a, Moulding of precision glass

 

The molding of precision glass is to make the glass material heated to high temperature and become plastic, and then molded by aspheric mold, and finally gradually cooled to room temperature.At present, the molding of precision glass is not suitable for aspheric lens with diameter greater than 10mm. However, new tools, optical glass and metrology process are driving the development of the technology. Although precision glass molding at the beginning of the design has high cost (high precision mold development), but after the molding, the production of high-quality products can be split off the pre development costs. It is especially suitable for the needs of mass production.

 

b, Forming of precision polishing

 

Lapping and polishing are generally applicable to the production of monolithic aspheric lenses at one time. With the improvement of technology, the accuracy is higher and higher.The most remarkable thing is that precise polishing is controlled by computers and automatically adjusted to optimize parameters.If higher quality polishing is required, magnetorheological finishing (magneto-rheological finishing) will be adopted. Compared with standard polishing, magnetorheological finishing has higher performance and shorter time.Precision polishing molding technology need professional equipment. It is currently the first choice of sample production and small batch sample.

 

c, Hybrid molding technology

 

The hybrid molding is a spherical aspheric lens with a spherical lens as the substrate, which is cast on the surface of the spherical lens through an aspherical mould and cured by a layer of high polymer with UV light.Mixed forming is generally used the achromatic spherical lens as the base, and then a layer of aspheric surface is cast on the surface to eliminate chromatic aberration and spherical aberration simultaneously.Figure 7 is the manufacturing process of the hybrid aspheric lens. The hybrid aspherical lens is suitable for large scale manufacturing with additional characteristics (eliminating chromatic aberration and spherical aberration) .

 

d, Injection molding

 

In addition to glass aspherical lenses, there are plastic aspheric lenses.Plastic molding is the injection of molten plastics into aspherical molds.Compared with glass, the thermal stability and compressive resistance of plastics are poor. It requires special treatment to obtain similar aspherical lenses. However, the plastic aspheric lens is characterized by its low cost, light weight and easy molding. It is widely used in the fields of moderate optical quality, insensitive to thermal stability and little pressure resistance.

 

4, Basis of choice

 

All kinds of aspheric lenses have their own relative advantages. Therefore, it is very important to choose the right products for different applications. The main considerations include: batch, quality and cost.

 

As a reliable optical assembly manufacturing company, we will do our best to provide more kinds of related products for sale, if you have needs, please contact us.

 

ZnSe ZnS window

 ZnSe Windows

 

Low Dispersion

Available Uncoated or AR Coated

Ideal for Thermal Imaging, FLIR, and Medical Systems

 

Hyperion Optics Zinc Selenide Window (ZnS Window) are perfect for a wide variety of infrared applications including thermal imaging, FLIR, and medical systems. This chemical vapor deposited material has extensive usage in high power CO2 laser systems because of its low absorption coefficient and high resistance to thermal shock. Zinc Selenide (znse window) is a relatively soft material that scratches easily, and it is not recommended in harsh environments because its Knoop Hardness is only 120. When handling, apply uniform pressure and wear Latex finger cots or gloves to prevent contamination.

 

Note: Special care should be taken when handling Zinc Selenide as it is a toxic material. Always wear rubber or plastic gloves to avoid the risk of contamination.

 

Uncoated or with AR Coatings Designed for a Variety of IR Ranges

Minimal Chromatic Aberration Due to Low Dispersion

Ideal for Infrared Applications Requiring Rugged Optics

 

Hyperion Optics Germanium Windows are available off-the-shelf with three anti-reflection coating options: 3 - 5μm for mid-infrared applications, 3 - 12μm for broadband multispectral applications, or 8 - 12μm for thermal imaging applications. Due to its high index of refraction (around 4.0 from 2 - 14μm), an anti-reflection coating is recommended for these germanium windows for sufficient transmission in the region of interest. Germanium is subject to thermal runaway, meaning that the transmission decreases as temperature increases. As such, these germanium windows should be used at temperatures below 100°C. Germanium’s high density (5.33 g/cm3) should be considered when designing for weight-sensitive systems. The Knoop Hardness of germanium (780) is approximately twice that of magnesium fluoride, making it ideal for infrared applications requiring rugged optics.

 

More details of optical assembly manufacturing processes, please visit our website.

 

 

Infrared Windows

 Among other materials for Hyperion Optics showing good transmission in 2-15 µm range. Due to high refractive index Ge lenses became very useful components of IR imaging systems operating in both “atmosphere windows”: 3-5 and 8-12 microns.

 

Both monocrystalline and polycrystalline Ge may be used for optical assembly manufacturing. We produce Germanium lenses and windows for infrared thermal imaging applications and pyrometry (see our webpageGermanium windows and lenses for thermography). Also such components for spectroscopy as ATR prisms,detector windows, and IR Polarizers are available.

 

Ge is also good electromagnetic interference (EMI) shielding material. Its special grade called EMI for its ability to shield against electromagnetic interference has become increasingly important for modern military applications where other signals (within millimeter and centimeter range) can be strong enough to make nearby IR systems ineffective. Typical resistance for EMI grade Germanium is about 4 Ohm x cm but it depends on required level of spurious signal suppression. Using Ge window with such resistance these signals are effectively shorted out and the IR Windows system shows good performance.

 

 

Borosilicate Windows

 Hyperion Optics is a premium supplier of photonics products including optical components, lens systems, and opto-mechanical assemblies from UV, VIS, NIR, to SWIR applications. We specialize in optical assembly manufacturing, hyp design, optical design manufacturing from rapid prototyping to volume production. Our comprehensive metrology coupled with cost-effective philosophy can help Hyperion customers obtain a competitive edge in the global market.

 

Borosilicate Window is ideal for high temperature and harsh environment applications. With its excellent shock and thermal resistance property, borosilicate window products can maintain flatness in different environmental conditions.

 

Unlike common borosilicate that is drawn flat, is produced by a float technique that yields superior surface flatness — typically 4 - 6λ per inch.  For more information per material property, please refer to Schott official  brochure.

 

Hyperion Optics orders directly from Schott, offer two grades of custom borosilicate or equivalent windows, float grade which are cut from standard float sheet material and polished grade which are further intensively polished for better flatness and surface quality according to application requirement. We have been providing our standard and custom optical window for filter, first surface mirrors, protection windows utility.

 

Please check our precision grade and thickness available.

 

Standard Thickness
CT (mm) Tol (mm)	CT (mm) Tol (mm)
0.70 ± 0.05	8.00 ± 0.30
1.10 ± 0.05	9.00 ± 0.30
1.75 ± 0.05	11.00 ± 0.30
2.00 ± 0.05	13.00 ± 0.30
2.25 ± 0.10	15.00 ± 0.50
2.75 ± 0.10	16.00 ± 0.50
3.30 ± 0.20	18.00 ± 0.50
3.80 ± 0.20	19.00 ± 0.50
5.00 ± 0.20	20.00 ± 0.70
5.50 ± 0.20	21.00 ± 0.70
6.50 ± 0.20	25.40 ± 1.00
7.50 ± 0.30

 

Polished Borosilicate Windows	COMMERCIAL GRADE	FACTORY STANDARD	PRECISION GRADE
Diameter Tolerance(mm)	±0.05	±0.03	±0.0125
Center Thickness(mm)	±0.01	±0.03	±0.025
Parallelism (Arc min)	6	<3	<1
Cosmetic(MIL-C-13830A)	100-80	40-20	10-5
Figure Tolerance inλ(Pow/irreg)	3 - 1	2 - 1/4	1 - 1/10
Coating (T% avg)	96-98%	99%	99.5%
Materials	Borosilicate Glass