Laser Debris Shields

Optical Surfaces Ltd. is a leading supplier of laser debris shields (also known as protective windows or cover slides) to protect target-facing optics located in high-power laser facilities.

Laser Debris Shields

Laser debris shields help prevent damage to the focusing optics in laser beam delivery systems caused by dust, shrapnel and fragments originating from the target during laser processing. Optical Surfaces’ debris shields offer a cost effective solution to greatly extending the service life of typically expensive high power laser refractive and reflective optics.

Manufacturing high quality laser debris shields combines the dual demands of producing a precision wavefront on a flexible window with a high diameter to thickness ratio. Working with a wide range of glasses, which offer good homogeneity and transmission from the UV to the Near-IR, Optical Surfaces Ltd. is able to supply laser debris shields of the optimum shape and thickness to suit your laser delivery system and target facing optics.

Optical Surfaces Ltd.’s skilled and experienced craftsmen are able to routinely produce laser debris shields with high surface accuracy / quality (lambda/10 wavefront error and surface finish of 10/5), flatness and parallelism to <1 arc second. Automatic edging and bevelling on debris shields provides diamond edge finishes as per MIL-PRF-13830B, MIL-I-45208 & ISO-10110 specifications. High power laser anti-reflective coatings are available to optimise the transmission of your debris shields. For further information relating to high power laser optics and debris shields please visit www.optisurf.com/index.php/products/flats-and-windows/windows/ or contact Optical Surfaces Ltd. on +44-208-668-6126 or email sales@optisurf.com.

Optical Surfaces Delivers Parabolic Mirrors for Petawatt Laser

Parabolic Mirrors for Petawatt LaserOptical Surfaces Ltd. has delivered three challenging off-axis parabola of 175mm diameter to the UK’s prestigious Rutherford Appleton Laboratory.

Using a new technique – Optical Surfaces highly experienced and skilled production team manufactured a very fast parent F 0.6 parabola from which 3 fast focusing off-axis parabolic mirrors with surface accuracy of better than lambda/8 P-V, surface quality of 20/10 scratch/dig and surface slope error of lambda/10/cm P-V were produced.

The world class Gemini laser based at the Rutherford Appleton Laboratory, delivers Petawatt power laser pulses to targets only a few microns in size. The temperatures, pressures and magnetic fields at the laser focus reach levels that otherwise exist only inside stars, making Gemini a unique facility for scientists to conduct experiments that cannot be attempted anywhere else. Laser-plasma interactions under these conditions can produce energetic beams of electrons and protons as well as bright, coherent sources of X-rays and can also address fundamental questions in astrophysics and plasma physics. The laser focus is routinely generated with the use of precise parabolic focusing optics, which can only be made by a few companies in the world.

Parabolic Mirrors for Petawatt LaserThe order for the most recent focusing optic was tendered and awarded to Optical Surfaces Ltd. The key focusing mirror was particularly challenging as it was required to have a hole through the optic, on the focusing axis. This hole facilitates the co-propagation of a much longer focal length beam enabling a whole range of additional science to be explored.

Dr Aris Kouris of Optical Surfaces Ltd commented “To enable a range of new experiments on their Gemini laser, Rutherford ordered three off-axis paraboloids – one with a slanted conical hole in the centre and two without a hole. Due to tight operational constraints the delivery of the OAP with the hole had to be within a specific timeframe. For this reason, and due to the very demanding specification for this optic, we developed a new manufacturing technique that enabled us to speed up the manufacturing time of the parent parabola significantly. The method has successful and we managed to deliver it within the requested timeframe”.

Optical Surfaces Ltd has been producing optical components and systems for more than 50 years and is now accepted as one of the world’s leading manufacturers of high-precision optics for high power laser research facilities. 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 relating to Central Laser Facility at the STFC Rutherford Appleton Laboratory please visit http://www.clf.stfc.ac.uk/CLF/

For further information relating to diffraction limited parabolic mirrors please click here or contact Optical Surfaces Ltd by telephone on +44-208-668-6126 or email sales@optisurf.com.

High Precision Grisms for Euclid Mission to Map the Dark Universe

Optical Surfaces Ltd. has supplied the Laboratoire d’astrophysique de Marseille (LAM) (www.lam.fr) with polished substrates to manufacture the high precision grisms that lie at the heart of a Near Infrared Spectrophotometer designed to perform red shift measurements in the forthcoming Euclid space mission by the European Space Agency (ESA).

high-precision-grisms

LAM is one of the largest astrophysics public research institutes in France. It combines fundamental research in Astrophysics and the development of instrumentation for space and ground-based telescopes. The ESA’s Euclid space mission will study the dark universe. One of the on-board probes will be a Baryonic Acoustic Oscillations (BAO) device which will measure the red shift of millions of galaxies through their Near Infrared spectra. The Near Infrared Spectrophotometer instrument that forms part of the BAO has been designed to use low-resolution grisms in slit less mode to perform this massive red shift measurement.

A LAM spokesperson commented “The Near Infrared Spectrophotometer lies at the heart of making critical measurements on the Euclid mission. Consequently selection of a partner to supply the key optical components for the Spectrophotometer was a rigorous process. Our Near Infrared Spectrophotometer design requires 4 high precision grisms mounted on a wheel to allow us to measure galaxy red shifts in two spectral bands: 0.92-1.3 and 1.25-1.85 µm. Each grism is made a 140 mm Suprasil 3001 prism, manufactured from a 150 mm parallel plate onto which a grating is etched on the polished face and then the prism is manufactured”.

Dr Aris Kouris, sales manager for Optical Surfaces Ltd. commented “We are pleased to have produced the substrates to manufacture the grisms that will operate in the Euclid mission Near Infrared Spectrophotometer, and in particular the surface dedicated to the grating.. Apart from high surface accuracy (<10 nm RMS), our main challenge was to develop a polishing method to routinely achieve the extremely demanding near-zero sub-surface damage required by the project. In order to achieve this, the surfaces had to be kept completely clean and free of contamination while at the same time be kept virtualy scratch-free with a microroughness well below 1nm RMS. We found that any deviation from the required cleanliness and surface quality / roughness resulted in non-perfect surfaces after chemical etching, even if the surfaces look “perfect” prior to etching. It proved that only on virtually perfect surfaces could LAM make a grating to the standards that they require”. 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 high-precision optics and optical systems for space and ground based telescope applications. 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 space applications please contact Optical Surfaces Ltd. on +44-208-668-6126 / sales@optisurf.com.

High Precision Spherical Mirrors

High precision spherical mirrors produced by Optical Surfaces Ltd. are used in a huge variety of applications including Schlieren imaging, wind tunnels, observatory spectrographs, bubble chambers and to test hyperboloids (as Hindle spheres).

High Precision Spherical Mirrors

Benefiting from workshops and test facilities deep underground, where temperatures remain constant and vibration is practically non-existent, Optical Surfaces routinely produces high precision spherical mirrors in a wide range of materials and coatings. 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.

A typical example of these capabilities is a 1.3-metre diameter spectrograph spherical mirror supplied to the Royal Greenwich Observatory (UK) that was installed on the 2.5-metre Isaac Newton Telescope located at La Palma in the Canary Islands. This spectrograph contributed to obtaining the first observable evidence of the existence of black holes.

For further information on high precision spherical mirrors please visit www.optisurf.com/index.php/products/spherical-mirrors/ or contact Optical Surfaces Ltd. on +44-208-668-6126 / sales@optsurf.com.

Standard & Custom Design Off-Axis Paraboloids

In addition to supplying a range of standard specification Off-Axis Paraboloids (OAPs), Optical Surfaces Ltd. offers a consultative design and manufacture service to produce custom OAP’s to fulfil the most demanding and specialist applications.

off-axis-paraboloid-1Off-axis paraboloids, sometimes referred to off-axis parabolic mirrors or off-axis parabola, provide optical designers with an unobstructed aperture allowing complete access to the focal region as well as reducing the size and minimising the weight of a design. They are especially suitable for broadband or multiple wavelength applications due to their completely achromatic performance. All together these advantages produce a cost-effective solution for many optical design problems with no compromise in performance.

Production approved to ISO 9001-2008 the quality of OAPs from Optical Surfaces Ltd. is ensured using a range of interferometric and surface test measurements on all optics leaving the factory. The company offers a wide range of coatings to enable optimised OAP performance in applications including Beam Collimation / Expansion, FLIR testing, High power laser beam focusing, Astronomical spectrographs, Target projection, MTF referencing and MRTD testing.

Benefiting from a uniquely stable manufacturing environment, and over 50 years’ experience and expertise, Optical Surfaces OAPs are used by many leading research establishments and companies around the world.

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

Technical information Brief: Off-Axis Parabolic Mirrors

Optical Surfaces Ltd has produced a technical information brief that serves to provide an introduction to the company’s broad range of capabilities in producing Off-Axis Paraboloids (OAPs).

In addition to supplying these standard specifications, Optical Surfaces technical team is at your disposal to discuss, propose and produce specialised custom OAP’s to fulfil the most demanding applications.

info-off-axis-paraboloidsOff-axis paraboloids, sometimes referred to off-axis parabolic mirrors or off-axis parabola, provide optical designers with an unobstructed aperture allowing complete access to the focal region as well as reducing the size and minimising the weight of a design. They are especially suitable for broadband or multiple wavelength applications due to their completely achromatic performance. All together these advantages produce a cost-effective solution for many optical design problems with no compromise in performance.

Production approved to ISO 9001-2008 the quality of OAPs from Optical Surfaces Ltd. is ensured using a range of interferometric and surface test measurements on all optics leaving the factory. The company offers a wide range of coatings to enable optimised OAP performance in applications including Beam Collimation / Expansion, FLIR testing, High power laser beam focusing, Astronomical spectrographs, Target projection, MTF referencing and MRTD testing.

Benefiting from a uniquely stable manufacturing environment, and over 50 years’ experience and expertise, Optical Surfaces OAPs are used by many leading research establishments and companies around the world.

For a copy of the OAP technical information brief please visit www.optisurf.com/index.php/products/off-axis-paraboloids/ or contact Optical Surfaces Ltd. on +44-208-668-6126 / sales@optisurf.com

Active Isolation Renders Reflective Collimators Truly Portable

prortable-reflective-collimatorsOptical Surfaces Ltd. has introduced a new option for its range of fully enclosed, pre-aligned reflective collimators.

For organisations looking for the flexibility of being able to use a reflective collimator on different experiments around their laboratory – Optical Surfaces has developed self-aligning isolating feet. The isolating feet allow a ±10mm height adjustment and enable easy relocation of the reflective collimator without any loss of performance. The isolating feet clamp onto standard optical tables and operate in two modes. When the unit is static the isolating feet are set in “no floating mode”. However to ensure smooth and safe transfer from one place to another the isolating feet may be set in “floating mode”.

High stability and performance on Optical Surfaces reflective collimators is achieved using a zero expansion off-axis parabola, manufactured to better than lambda/10 p-v surface accuracy. The optics within each unit are secured by the use of stress-free mounts and come pre-aligned in our laboratories for optimum performance. The off-axis design of Optical Surfaces reflective collimators produces no central obscuration thereby ensuring highly efficient transmission is obtained.

The all-reflecting design of Optical Surfaces reflective collimators is achromatic and with aluminium / magnesium fluoride coatings can operate from the UV to the infrared without adjustment. Using zero expansion glass mirror substrates Optical Surfaces reflective collimators provide exceptional operational stability. Each unit has an output port datum plane giving a defined distance to the focus. All reflective collimators provide a 20mm field ensuring full compatibility with standard black bodies.

Standard models include exit apertures of 100mm, 120mm, 150mm, 200mm, 240mm and 300mm. Customised systems can be supplied with larger field sizes, different output interfaces and platforms. Other options include reticle holders, lamp houses and black bodies. Test interferogram and analysis, showing wavefront accuracy, focal length and working distance, are supplied with every reflective collimator supplied.

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

Ensuring the Flatness of Mirrors

Optical Surfaces is a leading supplier of large, high precision reference flats and mirrors (coated flats) to research establishments, high power laser facilities and organisations worldwide.

mounts-montageFor high power laser applications – mirrors are typically produced by treating a flat substrate with several layers of ultra hard dielectric coating. Unfortunately these hard dielectric coatings cause a surface which is perfectly flat before coating to pull after coating and to induce that surface to become more convex. Whilst each type of coating behaves uniquely depending on coating design, type of material, aspect ratio of the blank and internal stresses, Optical Surfaces has developed expertise to mitigate the uncertainties associated with the coating to ensure flatness of mirrors, and hence the performance of the mirror.

Benefiting from a unique thermally stable manufacturing environment, and working with high-stability materials such as fused Quartz and Zerodur, Optical Surfaces is able to routinely achieve a surface accuracy of better than lambda/10 p.v. and surface roughness of less than 1nm on flats and mirrors (coated flats) up to 600mm in diameter. In addition to circular flats and mirrors (coated flats), Optical Surfaces is experienced in producing flats and mirrors in other shapes, light-weighted mirrors and supplying high precision mounts.

All flats and mirrors (coated flats) from Optical Surfaces Ltd. come with full quality testing assurance. For further information please visit www.optisurf.com/index.php/products/flats-and-windows/flats or contact Optical Surfaces on +44-208-668-6126 / sales@optisurf.com

Low Scatter Off-Axis Parabolic Mirrors

off-axis-paraboloid-2Designed to focus or collimate broadband light, off-axis parabolic mirrors from Optical Surfaces Ltd. are manufactured to the most demanding tolerances.

Unlike standard parabolic mirrors, off-axis parabolic (OAP) mirrors direct and focus incident collimated light at a specific angle, allowing unrestricted access to the focal point. Commonly these mirrors are used as collimators in Schlieren, MTF and FLIR systems, high power laser focusing, focusing upon astronomical objects, beam expansion and bore sight alignment for missile guidance systems.

Working with the highest quality optical glasses – Optical Surfaces Ltd. routinely produces OAP from 60mm to 600 mm in diameter. Benefiting from a uniquely stable manufacturing environment, and a highly skilled team of engineers and craftsmen, Optical Surfaces is able to manufacture OAPs with surface accuracy to lambda/20 (peak-to-valley) depending upon off-axis angles. Using proprietary polishing techniques Optical Surfaces can, depending on the surface accuracy required, achieve the natural limit to the off-axis angle of around 25-30 degrees and surface micro-roughness of less than 1 nm. A range of coatings is available from metallic with or without protective overcoat to multilayer dielectrics and ultra hard coatings to suit all applications.

off-axis-paraboloid-1Drawing upon over 50 years in this field, Optical Surfaces Ltd has established itself as one of the world’s leading suppliers of OAP’s for ground breaking applications by leading research institutes and organisations worldwide.

Optical Surfaces ISO 9001-2008 approved manufacturing facility provides the flexible resources to supply from single specialist requirements to OEM quantities. Benefiting from its uniquely stable manufacturing environment and highly experienced workforce – Optical Surfaces is able to routinely achieve the most demanding optical tolerances. All precision optics and optical systems are provided with a complete quality test assurance report.

For further information please visit www.optisurf.com or contact Optical Surfaces Ltd. on +44-208-668-6126 / sales@optsurf.com.

Ultra-high Precision Optics & Optical Systems

Laser World of Photonics - Optical SurfacesOptical Surfaces Ltd. has announced that it will be exhibiting examples of its ultra-high precision optics and optical systems at the forthcoming LASER World of PHOTONICS 2015 exhibition in Munich, Germany.

Visitors to Halle B3 Stand 103, the stand of German agent – Laser 2000 GmbH, will be able to meet and discuss with technical staff requirements for large diameter optics, beam expanders, collimators, parabolic mirrors and mirror mounts as well as prototypes and custom systems.

Over the last 50 years – Optical Surfaces Ltd has established itself as a leading international manufacturer of top quality, high precision optical components and systems. The company is a regular supplier to major projects worldwide and has particular knowledge and experience of supplying ultra-high precision optics for applications in fundamental physics, astronomy, space research, defence and environmental monitoring.

Optical Surfaces ISO 9001-2008 approved manufacturing facility provides the flexible resources to supply from single specialist requirements to OEM quantities. Benefiting from its uniquely stable manufacturing environment and highly experienced workforce – Optical Surfaces is able to routinely achieve the most demanding optical tolerances. All precision optics and optical systems are provided with a complete quality test assurance report.

For further information please visit www.optisurf.com or contact Optical Surfaces Ltd. on +44-208-668-6126 / sales@optsurf.com.

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