Ultra-Stable Mounts for Optics & Mirrors

Optical Surfaces Ltd offer a range of high precision mounts developed to support off-axis paraboloids, spheres and optical flats up to 600mm diameter in applications where stability is important.

Ultra-Stable Mounts for Optics & Mirrors

Constructed in black anodized aluminium – four models of OS Mounts provide a secure and stable platform for mirror diameters from 100mm (4 inches) to 254mm (10 inches). Angular alignment can be made about two axes by means of dual action adjusters with fine screw and ultra-fine differential micrometre action. Using these mounts, it is possible to rapidly align a mirror within a few arc seconds. To facilitate rapid and simple mounting onto an optical table or other support each mirror mount comes with a baseplate.

For larger optics and mirrors – OS 300-600 mounts are available in four standard sizes to accommodate high precision mirrors from 305 mm (12 inches) to 550 mm (21.6 inches) in diameter. Angular alignment of mounted mirrors is achieved about the vertical and horizontal axes using dual action adjusters with fine screw and ultra-fine differential micrometre action. Using these mounts, it is possible to rapidly align a large diameter mirror within a few arc seconds. Each OS 300-600 mount comes with adjustable feet to facilitate rapid and simple mounting onto an optical table. A range of additional motorised options are available for OS 300-600 series mounts to enable remote operation in hostile environments or for use in limited space applications where manual adjustment may be difficult.

For mirrors over 550mm diameter – Optical Surfaces has facility and experience of providing ultra-stable mounts for such systems.

For further information on ultra-stable mounts to support optics and mirrors please visit www.optisurf.com/index.php/products/product-6/mounts-and-mounted-optics/ or contact Optical Surfaces Ltd. on +44-208-668-6126 / sales@optisurf.com

Environmental Monitoring from the International Space Station

Optical Surfaces Ltd. reports how a motorised UV-Vis-NIR collimator and interferometric alignment system it supplied to the Deutsches Zentrum für Luft- und Raumfahrt (DLR) in Berlin, Germany has been used to set-up the ground breaking DLR Earth Sensing Imaging Spectrometer (DESIS).

Environmental Monitoring from the International Space Station

On 23 October 2019, DLR the renowned German Aerospace Center, and the U.S. company Teledyne Brown Engineering (TBE) announced the start of routine operations for DESIS on the International Space Station. Operated by DLR and TBE, DESIS is the most powerful hyperspectral Earth observation instrument in orbit and addresses a wide range of applications. Its high-resolution image data will enable the development of measures for environmental protection and support the more efficient, ecological use of agricultural land.

The hyperspectral Earth observation instrument provides images with a one-of-a-kind level of quality. The sensor system collects image data in 235 closely spaced spectral bands from on board the International Space Station (ISS), at an altitude of 400 kilometres. It has a ground resolution of 30 metres and a spectral resolution of 2.55 nanometres. This significantly increases the depth of information available in Earth observation data. The first images were acquired shortly after initial setup and DESIS data has already been used to identify plastic islands and oil slicks at sea. A few months ago, the high spatial resolution of DESIS made it possible to detect rare Earth elements from space for the first time.

Broadband Collimator SystemIlse Sebastian, a Calibration Engineer at DLR commented “By installing the motorised UV-Vis-NIR collimator and interferometric alignment system in our class 100,000 clean room we have been able to undertake diffraction limited broadband imaging for MTF measurement, focusing and geometric calibration of single optics and focal planes, fully integrated camera systems and hyperspectral imaging systems such as DESIS. To monitor and verify that the UV-Vis-NIR collimator system is consistently in alignment – Optical Surfaces also designed and supplied a software-operated Laser Unequal Pathlength Interferometer (LUPI) system to interface with the collimator system”.

For further information relating to high precision optical systems for space and aeronautic research please contact Optical Surfaces Ltd on +44-208-668-6126 / sales@optisurf.com.

For further information relating to the Institute of Optical Sensor Systems at Deutsches Zentrum für Luft- und Raumfahrt (DLR) please visit https://www.dlr.de/os

Off-Axis Parabolic Mirrors for Imaging Applications

Optical Surfaces Ltd is a leading international manufacturer of Off-Axis Parabolic Mirrors (OAPs) for demanding imaging applications.

Off-axis parabolic mirrors can be a useful tool in optical design. OAPs combine the achromatic and diffraction limited imaging properties of a parabolic mirror with the ability to deviate the light path off-axis, which is useful for most imaging systems. OAP’s offer the ability to focus collimated light without introducing spherical aberration. Additionally, unlike a centred parabolic mirror, an OAP mirror advantageously allows more interactive space around the focal point without disrupting the beam. OAP mirrors are especially suitable for broadband or multiple wavelength applications.

Using proprietary production techniques, and benefiting from a uniquely stable manufacturing environment, Optical Surfaces highly experienced and skilled engineering team are world renowned for producing fast focusing OAP mirrors with unmatched surface accuracy, surface quality and surface slope errors.

Dr Aris Kouris of Optical Surfaces Ltd commented “In recent years we are honoured to have been selected by world leading high power laser research groups including AWE, ELI, LULI and CLF Rutherford as well as a growing number of academic centres of excellence to provide key OAP mirrors and other related optics for a range of demanding imaging applications”.

For further information on OAP mirrors for demanding imaging applications please visit www.optisurf.com/index.php/products/off-axis-paraboloids/ or contact Optical Surfaces Ltd. on +44-208-668-6126 / sales@optisurf.com

Demanding Telescope Spectrograph Optics

The Canada-France-Hawaii Telescope at dusk (courtesy: CFHT)

Benefiting from a unique facility, where temperatures remain constant year-round and vibration is practically non-existent, Optical Surfaces Ltd is able to routinely produce and test demanding telescope spectrograph optics (aspheres, flats, lenses, mirrors and prisms) that stretch the limits of conventional optical fabrication techniques.

Using a spectrograph, researchers are able to study the chemical and physical conditions that exist through a cross-section of space. Combined with a land or space-based telescope a spectrograph can reveal valuable information about the spectral distribution of light from a distant astronomical object.

Results from the SPIRou spectrograph at the Canada-France-Hawaii Telescope (courtesy: CFHT)

Benefitting from its highly experienced team of optical designers, engineers, and skilled production staff and its uniquely stable manufacturing facility – Optical Surfaces Ltd. has been chosen as a preferred supplier by many renowned international astronomy research groups. Notable projects completed by Optical Surfaces include SPIRou and ESPaDOnS spectrographs at the Canada-France-Hawaii telescope (CFHT), the Narval stellar spectropolarimeter on the 2m Bernard Lyot Telescope in the French Pyrenees, the High Resolution Optical Spectrograph (HROS) based on the 8m Gemini Telescope in Chile and the Fibre-fed Extended Range Optical Spectrograph (FEROS) at the European Southern Observatory (ESO).

As a leading international supplier of high precision optics for astronomical telescopes – Optical Surfaces maintains a range of interferometers that allows one-to-one testing of even the largest diameter spectrograph optics. Topographic and fringe analysis provides precise testing of surface roughness and confirms the wave front of various surface forms. Operating a rolling program for calibration of test optics where possible to national standards and production approval to ISO 9001-2015 ensures that the quality of telescope spectrograph optics from Optical Surfaces Ltd. is second to none.

For further information on high precision telescope spectrograph optics please contact Optical Surfaces Ltd. on telephone on +44-208-668-6126 / sales@optisurf.com. A selection of astronomical customer stories from around the world may be reviewed at www.optisurf.com/index.php/news/application-stories/.

Custom Beamsplitters

Optical Surfaces Ltd is a leading supplier of single to OEM quantities of high precision, custom beamsplitters to a growing number of spectroscopy, interferometry and imaging instrument manufacturers around the world.

The optimal beamsplitter can take on many forms including cubes, plates, hexagons, pentagons, polarizing, non-polarizing or wedge designs in a wide variety of reflection / transmission ratios and substrates depending upon your application.

custom beamsplitters

Drawing upon over 50-years’ experience – Optical Surfaces technical experts can advise you on the key beamsplitter parameters to consider including wavelength range, physical size, polarization and if used in an interferometer – pathlength and phase matching requirements.

Benefiting from a uniquely stable production environment and a highly skilled workforce – Optical Surfaces is able to produce custom beamsplitters that offer outstanding flatness and parallel specifications. Typically Optical Surfaces beamsplitters are manufactured to a surface accuracy of lambda/20 p-v at 633nm, a surface quality of 10/5 and microroughness of less than 1.2nm rms. Supplied mounted or unmounted, custom beamsplitters from Optical Surfaces can be enhanced with an extensive range of coatings designed to operate at your required angle of incidence.

For further information please visit www.optisurf.com/index.php/products/prisms-beamsplitters-filters-and-fibres/ or contact Optical Surfaces Ltd on +44-208-668-6126 / sales@optisurf.com.

Large Prisms for Demanding Spectroscopic Applications

Large Prisms for Demanding Spectroscopic Applications

Large, high quality prism

Optical Surfaces Ltd. is a leading manufacturer of large, high quality prisms for spectroscopic, surveying and telescope applications.

Prisms are solid optics that are ground and polished into geometrical and optically significant shapes where the angle, position, and number of surfaces help define the type and function.

Spectroscopic applications typically demand that prisms must be manufactured with very strict tolerances and accuracies. Due to the variability in shape, size and the number of surfaces, manufacturing of high-quality prisms requires considerable experience and skill.

For over 50 years – Optical Surfaces has supplied high quality uncoated and coated prisms for spectroscopic applications including image rotation, inversion, re-direction as well as to disperse light into its constituent colours.

Operating in a uniquely stable manufacturing environment – Optical Surfaces is able to produce all types and configurations of prism (amici/roof, bi-Fresnel, corner cube retroreflectors, dove, equilateral, isosceles, penta, rhomboid and wedge) with market-leading tolerances.

Manufactured from high quality optical glasses, prisms are available as single components (up to 450mm) or as cemented units. Optical Surfaces production team routinely achieves angle accuracy of better than 2 arc seconds, surface accuracy of lambda/20 p-v, 10/5 surface quality and microroughness of less than 1.2nm rms on its prisms.

Drawing upon over 50 years’ experience, Optical Surfaces ISO 9001-2015 approved manufacturing facility is able to produce high quality prisms to customer supplied specifications in quantities ranging from prototypes, through batch runs to production quantities. Full test data is provided with every prism.

For further information please visit www.optisurf.com/index.php/products/prisms-beamsplitters-filters-and-fibres/ or contact Optical Surfaces Ltd. on +44-208-668-6126 / sales@optisurf.com

Hyperbolic Mirrors for Deep Space Observation

Optical Surfaces Ltd. is a leading international manufacturer of hyperbolic mirrors for deep space observation telescopes and earth observation satellites.

Hyperbolic Mirrors for Deep Space ObservationA hyperbolic mirror is the optical component of choice for precisely and accurately focusing light in a telescope from one focal point to the other focal point.

Hyperbolic mirrors are used in a telescope design to correct certain distortions caused by an extremely fast f-ratio design. A hyperbolic secondary mirror is used in Cassegrain telescopes to correct the spherical aberration caused by shorter focal length (smaller f/ratio) of the parabolic primary. In addition, in some more extreme low f/ratio (~f/3) applications served by Ritchey-Chretien telescopes, both primary and secondary are hyperbolic. For large deep space research telescopes, hyperbolic mirrors that correct fast optics are almost always necessary.

Optical Surfaces skilled craftsmen are able to draw upon a uniquely stable production environment to produce hyperbolic mirrors up to 500mm diameter with typical wave front error of lambda/20 P-V, surface finish of 10/5 and microroughness less than 1.2nm RMS.

These hyperbolic mirrors can be supplied mounted or mounted and with a coating exactly optimised for your application. In space borne telescope platforms, where weight is an issue, Optical Surfaces can produce hyperbolic mirrors with light-weighting options.

Optical Surfaces Ltd has been producing optical components and systems for astronomical and space research for more than 50 years. The company’s ISO 9001-2015 approved manufacturing workshops and test facilities are deep underground in a series of tunnels excavated in solid chalk where temperature remains constant and vibration is practically non-existent. With such stable conditions testing, particularly with long path lengths, becomes quantifiable and reliable.

For further information relating to hyperbolic mirrors please visit www.optisurf.com/index.php/products/conic-sections/hyperboloids/ or contact Optical Surfaces Ltd. on +44-208-668-6126 / sales@optisurf.com.

Aspheric Optics for Nuclear Research Laser Facilities

Optical Surfaces Ltd. is an international supplier of diffraction-limited aspheric lenses for nuclear research laser facilities.

Aspheric Optics for Nuclear Research Laser Facilities

A large diameter diffraction-limited aspheric lens

Nuclear research laser facilities around the world today commonly use powerful amplified ultra-short duration pulses of coherent light to deliver massive energy densities at a given target. The synchronised delivery of such high-power pulses generates extreme conditions that allow scientists to carry out state of the art nuclear research and to study the conditions that exist in exotic and distant to us environments, such as the core of our sun. Using such facilities, researchers around the world are seeking to advance knowledge in fields such as particle and nuclear physics, material science, astrophysics with applications that range from nuclear energy to medical research. However, to push back the frontiers of these nuclear research applications places great demands on the quality of optics used to deliver and focus the energy of the high energy lasers onto their targets.

Over the last 40 years – Optical Surfaces has produced diffraction-limited aspheric lenses, up to 600mm in diameter, in a range of high-quality optical glasses with low f-number to optimise light gathering and focusing performance. Drawing upon a highly skilled workforce, proprietary production techniques and a uniquely stable manufacturing environment – Optical Surfaces is able to manufacture aspheric lenses with surface finish of 20/10 scratch/dig, surface roughness of 1nm rms and ultra-smooth slope errors.

These leading-edge specifications, coupled with a range of high-power laser coatings to maintain high transmission, has enabled Optical Surfaces aspheric lenses to operate at the ultra-high energy thresholds demanded by the latest generation of Terawatt lasers.

A rolling program for the calibration of test optics to national standards, where possible, and production approval to ISO 9001-2015 ensures that the quality of aspheric lenses from Optical Surfaces is second to none.

For further information on diffraction-limited aspheric lenses for nuclear research laser facilities please contact Optical Surfaces Ltd. on +44-208-668-6126 / sales@optisurf.com.

Precision Lenses Enable Ground-breaking Synchrotron Measurements

Using ultra smooth transmission optics supplied by Optical Surfaces Ltd, the MAX IV Laboratory has managed to achieve measurement of the smallest ever electron beam emittance on their state-of-the-art 3 GeV synchrotron storage ring.

3 GeV Storage Ring

The MAX IV Laboratory is Sweden’s internationally renowned national synchrotron radiation facility. Hosted at Lund University, it operates the world´s first fourth-generation storage ring, which uses a multi-bend achromat lattice and innovative accelerator engineering solutions to deliver unprecedented photon beam brightness for research in a wide variety of scientific fields.

Piano Convex LensÅke Andersson and Jonas Breunlin, researchers in the accelerator development group at the MAX IV Laboratory say “Since our 3 GeV storage ring was designed to store an electron beam of so far unprecedented transverse small dimensions and angular spreads, so-called emittance, two diagnostic beam lines were made available for observing and measuring these properties of the electron beam. Our beamlines use a much longer wavelength (visible to middle UV) region within the synchrotron radiation span than is normally used in other beamlines. Consequently, we base our measurements on the Kirchoff’s diffraction theory adapted to the synchrotron radiation emission and focusing. In this way we may use a relatively (compared to X-ray optics) simple optical set-up based on transmission optics. However, to do this we needed very high-quality surface accuracies on our optical components, in order to ensure that the radiation diffraction properties are not hidden by surface roughness or inaccuracies”.

Dr Andersson added “We selected Optical Surfaces Ltd to supply the critical high precision Plano convex lenses at the heart of our beam focusing set-up because of their extensive experience of supply critical optics to synchrotron facilities around the world and excellent technical support. We found Optical Surfaces very helpful in helping us make key decisions, such as choosing plano-convex instead of bi-convex lenses and choosing the optimum optical material offering best transmission down to 200nm. In addition, they were able to advise us small modifications to our design specification that would enable them to manufacture the lenses, three- and four-inch diameters, to our required surface accuracy of Lambda/20 (P-V) and transmitted wave form distortion around Lambda/15 (P-V). All-in-all our experience of working with Optical Surfaces on this project was very good. Accelerator science results from our 3 GeV storage ring, based on the diagnostic beam lines will be presented at the International Particle Accelerator Conference (IPAC 2019) now in May”.

Dr Aris Kouris, Sales Manager at Optical Surfaces Ltd. commented “We were very pleased to be approached by the MAX IV laboratory to discuss the optical requirements of their demanding synchrotron beam line project. This allowed us to exactly understand their needs and deliver the ultra-high quality plano-convex lenses their ground-breaking work needed”.

Optical Surfaces Ltd. has been producing optical components, mounted optical components and systems for more than 50 years and is now accepted as one of the world’s leading manufacturers of large high-precision optics and optical systems for synchrotron research. The company’s ISO 9001-2008 approved manufacturing workshops and test facilities are deep underground in a series of tunnels excavated in solid chalk where temperature remains constant and vibration is practically non-existent. With such stable conditions, testing, particularly with long path lengths, becomes quantifiable and reliable. Working with these natural advantages is a highly skilled team of craftsmen with a commitment to excellence in both product quality and customer service.

For further information on high precision optics for synchrotron research please visit www.optisurf.com or contact Optical Surfaces Ltd. on +44-208-668-6126 / sales@optisurf.com.

Mounted or Unmounted Spherical Mirrors

Optical Surfaces Ltd. is a leading international manufacturer of high precision spherical mirrors with radii (Rc) from 25 to 5000mm (1 to 200 inches) for use in UV-Visible and Infrared applications including Schlieren imaging, wind tunnels, observatory spectrographs, bubble chambers and as hindle spheres to test hyperboloids.

Over the last 50+ years, Optical Surfaces has produced concave and convex spherical mirrors with diameters up to 1.3 metres (511 inches) in a wide range of materials and coatings for leading research establishments and organisations worldwide

High Precision Mirrors  Spherical Mirrors  

With workshops and test facilities deep underground where temperatures remain constant and vibration is practically non-existent Optical Surfaces routinely produces spherical mirrors of unmatched quality. Typical achievable surface accuracy is better than lambda/30 p-v, surface quality 10:5 scratch dig and micro roughness less than 1.2nm RMS. These same unique production facilities allow Optical Surfaces to manufacture and test very long radii spherical mirrors by taking full advantage of the long tunnels they have at their disposal.

For applications where stability is critical, Optical Surfaces can also supply its high-quality OS Series mounts to provide a secure platform for your spherical mirrors. Angular alignment of mounted mirrors is achieved about the vertical and horizontal axes using dual action adjusters with fine screw and ultra-fine differential micrometer action. Using these mounts, it is possible to rapidly align a large diameter mirror within a few arc seconds. A range of additional motorised options are available for OS Series mounts to enable remote operation in hostile environments or for use in limited space applications where manual adjustment may be difficult.

Optical Surfaces ISO 9001-2000 approved manufacturing facility provides the flexible resources to supply from single specialist requirements to OEM quantities. Benefiting from its stable environment, quality testing becomes quantifiable and reliable. All spherical mirrors are provided with a complete quality test assurance report.

For further information on high precision spherical mirrors please contact Optical Surfaces Ltd. on +44-208-668-6126 / sales@optisurf.com.

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