Durable Mirrors for High Power Lasers

Optical Surfaces Ltd. is a specialist producer of extremely durable, high performance coated mirrors, up to 600 mm in diameter, for use with high power femtosecond lasers.

Durable Mirrors for High Power Lasers

Durable coated mirrors for high power femtosecond lasers

Employing the latest dielectric coating technology, these high-power laser mirrors provide minimum pulse distortion and the maximum usable bandwidth. When used with high-power femtosecond lasers operating at 750 to 850 nm, Optical Surfaces mirrors are designed for use at power densities exceeding 1 J/cm2 for high frequency 50-fs pulses without deterioration.

Benefiting from a uniquely stable production and testing environment – Optical Surfaces skilled craftsmen routinely produce high power laser mirrors of the highest quality and precision. Produced from materials including glass, ceramic, and silica – Optical Surfaces off-axis parabolic mirrors are designed to optimise the performance of rapid-pulsed high-power lasers. All surface accuracies are checked by interferometer and are guaranteed to meet lambda/10 p-v wave accuracy with low scatter. The quality and performance of large diameter, high power femtosecond laser mirrors from Optical Surfaces Ltd. is second to none.

Typical applications for these extremely durable high-power femtosecond laser mirrors includes plasma physics, laser manufacturing and telecommunications.

To read a case study visit https://www.optisurf.com/index.php/optical-surfaces-delivers-parabolic-mirrors-for-petawatt-laser/ or for further information please contact the company on +44-208-668-6126 / sales@optisurf.com.

Optical Windows for Wind Tunnel Aerodynamic Testing

Optical Windows for Wind Tunnel Aerodynamic Testing

Large diameter, high precision optical window

Optical Surfaces Ltd is a producer of large diameter, high precision windows for wind tunnel aerodynamic testing.

Aerodynamicists and engineers use wind tunnels to test models of proposed aircraft and engine components. During a test, the model is placed in the test section of the tunnel and air is made to flow past the model. Schlieren imaging is a valuable technique to provide diagnostic information about the ‘invisible’ flow of air around the model.

Benefiting from an ultra-stable production environment and proprietary polishing techniques – Optical Surfaces Ltd. is able to routinely produce optical windows up to 600mm in diameter with typical wavefront error of lambda/10 and surface finish of 40/20 to 10/5. This precision manufacturing capability in optical materials including BK-7 and fused silica, which offer good homogeneity and transmission from the UV to the Near-IR, combines to provide the perfect wind tunnel optical window to ensure superior Schlieren image quality.

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

Highly Smooth Off Axis Parabolic Mirrors Offer Near 100% Reflectance

Highly Smooth Off Axis Parabolic Mirrors

Large steep angle OAP and small convex mirror produced by Optical Surfaces Ltd.

Optical Surfaces Ltd. reports that its off-axis parabolic mirrors are particularly suitable for coating using an Ion Beam Sputtering (IBS) technique that provides near 100% reflectivity thereby providing unmatched protection from thermal damage that often arises from high power continuous wave lasers.

Dr Aris Kouris, Sales Director of Optical Surfaces Ltd. explained “Surface microroughness of parabolic mirrors is an important optical quality parameter which describes features which are typically smaller than slope errors. Mirror surface microroughness, when pronounced, will cause effects that may be compared to mild scattering. For many applications such effects may not be so critical. However, for high power laser applications using off-axis parabolic mirrors as key focusing elements these effects can play an important role and therefore microroughness needs to be well controlled”. Dr Kouris added “We have undertaken a long-term study that shows that the proprietary pitch polishing techniques we use to finish off-axis parabolic mirrors produces unmatched low microroughness that do not exceed 1nm RMS. This is particularly important as only ultra-smooth off-axis mirrors can be regularly successfully coated using the ion beam sputtering (IBS) technique and attain nearly 100% reflectance and negligible absorption levels”.

Distribution of microroughness measurements

Distribution of microroughness measurements on OAPs produced using pitch-polishing technique

Off-axis parabolic mirrors (OAP’s) 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 high power laser applications.

100% reflectivity produced by Ion Beam Sputtering technique

100% reflectivity produced by Ion Beam Sputtering technique

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 microroughness and surface slope errors.

In recent years – Optical Surfaces 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 high-power laser applications.

For further information on high reflectivity off-axis parabolic mirrors for high-power laser experiments please contact Optical Surfaces Ltd. on +44-208-668-6126 / sales@optisurf.com. To download a copy of the study ‘How microroughness impacts optical performance’ please visit www.optisurf.com/index.php/news/technical-tips/

Spectrograph to Record Near-IR Spectrum of Stars in a Single Exposure

Spectrograph prism

A Zinc Selendie (ZnSe) spectrograph prism

Optical Surfaces Ltd reports delivery to the Research Institute in Astrophysics and Planetology (IRAP) of high precision disperser prisms and folding mirror components that lie at the heart of the ground breaking SPIRou / SPIP near infrared spectrograph.

The SPIRou / SPIP spectrograph is designed to be able to record the whole near infrared spectrum of a star (over the wavelength range 0.98-2.35 µm and in either circular or linear polarization) on a 16-million-pixel Hawaii 4RG detector in a single exposure. In addition to being a spectropolarimeter, separating the light from stars into its elementary colours and vibration modes, SPIRou / SPIP is a high-precision velocimeter, capable of recording the tiny motions of a star that indicate the presence of an orbiting planet. As a consequence, the SPIRou/SPIP spectrograph will be used to also hunt for Earth-like planets orbiting in the habitable zones of nearby red-dwarf stars. IRAP (Toulouse, France) is one of the six laboratories which form the Midi-Pyrénées Observatory (https://www.omp.eu).

Yoan Micheau, a research engineer at OMP (Midi-Pyrénées Observatory), commented “Our innovative SPIRou / SPIP spectrograph is contained within a large cryogenic Dewar cooled down at a temperature of 77K (-200 °C) making it thermally stable to within a few millikelvin. To give us the best chance of recording faint astrophysics phenomena places great demand on the precision and accuracy of the spectrograph optics we use. Having successfully worked with Optical Surfaces Ltd on previous optically demanding projects it was an obvious choice to work with them again. I am very pleased to say that they have manufactured and delivered the large folding mirror and Infrasil / Zinc Selenide disperser prisms to the very demanding specifications (surface quality, transmission, wavefront error, scattered light and planarity) that we set”.

Dr Aris Kouris commented “Having supplied similar optics for the successful ESPaDOnS, FEROS and SPIRou projects, we have a proven record in manufacturing, mounting and testing precision optics for astrophysics projects”. He added “The high spectral resolution and performance that the SPIRou / SPIP spectrograph is designed to deliver can only be achieved by using optical components of the highest quality”.

The SPIRou / SPIP spectrograph contained within a large cryogenic dewar (courtesy:Midi-Pyrénées Observatory)

The scientific objectives of Midi-Pyrénées Observatory (https://www.omp.eu) are to study and develop understanding of the Universe including the Earth as a planet, its ionized environment, the sun and its planets, the stars and their planetary systems, the galaxies, the very first stars and the primeval Big Bang. The Midi-Pyrénées Observatory is acknowledged as a leading European centre of excellence in ground-space astrophysics.

Optical Surfaces Ltd. has been producing optical components and systems for leading astrophysics research groups for more than 50 years. 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 demanding, high precision optics for astrophysics please contact Optical Surfaces Ltd. on +44-208-668-6126 / sales@optisurf.com.

Light Weighted Mirrors

Light Weighted Mirrors

A light weighted mirror produced by Optical Surfaces Ltd.

Optical Surfaces Ltd has developed proprietary light weighting techniques that can reduce the weight of a mirror by as much as 60%.

In spaceborne applications the need to minimise payload is a key factor in designing optical systems. Optical Surfaces lightweight mirrors are designed to provide sufficient rigidity to ensure ultra-high precision optical performance while reducing the overall weight of the mirror. This reduced weight, in turn, allows smaller, lighter support and control structures, reducing the overall cost of optical systems such as space telescopes and spectrographs.

Light weighted mirrors also allow the creation of larger terrestrial telescopes and optical instruments than would be feasible with solid mirrors. Solid mirrors not only can be mechanically cumbersome, but are also difficult to cast and safely cool into a single, large block of optical glass.

Benefiting from a highly stable manufacturing environment and employing proprietary production techniques, Optical Surfaces highly experienced and skilled engineering team are world renowned for producing mirrors with unmatched surface accuracy, surface quality and surface slope errors. Working to strict ISO 9001-2015 guidelines all light weighted mirrors manufactured by Optical Surfaces Ltd are supplied with test data including high accuracy metrology, surface roughness and environmental data.

To discuss a light weighted mirror design to improve the performance of your telescope or optical instrument please contact Optical Surfaces Ltd. on +44-208-668-6126 or sales@optisurf.com.

Parabolic Mirrors for Optical Instruments

Parabolic Mirrors for Optical Instruments

An off-axis parabolic mirror produced by Optical Surfaces Ltd.

Optical Surfaces Ltd is a leading manufacturer of Off-Axis Parabolic Mirrors for optical instruments including radiometers, MTF measuring systems and spectrometers.

Off-axis parabolic (OAP) mirrors are the most common type of aspherical mirrors used in optical instruments because they are free from spherical aberrations, and can focus a parallel beam to a point or point source to infinity.

Employing off-axis parabolic mirrors in an instrument design allows optical engineers to not only minimise the size and weight of their system but also allows more interactive space around the focal point without disrupting the beam thereby increasing efficiency. OAP mirrors are especially suitable for broadband or multiple wavelength applications.

Benefiting from a uniquely stable manufacturing environment and employing proprietary production techniques, Optical Surfaces highly experienced and skilled engineering team are world renowned for producing off-axis parabolic mirrors with unmatched surface accuracy, surface quality and surface slope errors.

Optical Surfaces Ltd. has been producing top quality off-axis parabolic mirrors for more than 50 years and is widely accepted as one of the world’s leading manufacturers of these critical components for optical instruments.

Working to strict ISO 9001-2015 guidelines all off-axis parabolic mirrors manufactured by Optical Surfaces Ltd are supplied with test data including high accuracy metrology, surface roughness and environmental data.

To discuss an off-axis parabolic mirror design to improve the performance of your optical instrument please contact Optical Surfaces Ltd. on +44-208-668-6126 or sales@optisurf.com. For further information please visit www.optisurf.com/index.php/products/off-axis-paraboloids/

Optics and Optical Systems for Challenging Applications

Optical Surfaces Ltd is a leading manufacturer of high-precision optics and optical systems for challenging applications in areas including space research and high-power laser facilities investigating the frontiers of physics.

Broadband Collimator System

Motorised broadband collimator system now on-board the International Space Station

Using specialist production techniques, and benefiting from a uniquely stable manufacturing environment, Optical Surfaces highly experienced and skilled engineering team are renowned for producing ultra-smooth mirrors with unmatched surface accuracy, surface quality and surface slope errors.

Dr Aris Kouris of Optical Surfaces commented “Our pedigree in supplying state-of-the-art optics and optical systems for high power laser research is second to none. In recent years we have been selected by world leading high power laser research groups including AWE, ELI, LULI and CLF Rutherford as well as many academic centres of excellence to provide key mirrors and other related optics for a range of challenging applications”.

Hyperbolic mirror for deep space observation

Dr Kouris added “Producing high performance mirrors, lenses and spectrograph optics for space projects is something that we have done for many years. All optical components and systems to be used in space applications not only have to be lightweight but also have to meet certain key requirements to survive the harsh environment of space. They must be constructed of specific materials that will not outgas when exposed to the vacuum of space. All significant air spaces should be vented to avoid pressure on the elements and distortion of the lens. All materials right down to glues and greases must be approved and tested for outgassing”.

Very high precision focusing mirrors for the central laser facility at the Rutherford Appleton Laboratories (UK)

Optical Surfaces has been producing top quality optics for more than 50 years and is widely accepted as one of the world’s leading manufacturers of critical optical components and systems that are key to unlocking the secrets of the most challenging applications.

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.

In addition to producing precision optics and optical systems for challenging applications in high power laser physics and space research, Optical Surfaces Ltd also has considerable experience of supply for astronomical, healthcare, military and scientific research.

For further information or to discuss the optical requirements of your project please contact Optical Surfaces Ltd. on +44-208-668-6126 / sales@optisurf.com

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

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