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Oxford Lasers

Oxford Lasers

www.oxfordlasers.com

Oxford Lasers was founded in 1977 by physicists from Oxford University whose research had been directed towards the study of new, yet practical, laser devices. Initially the company focused on the manufacture of Excimer lasers and Copper Vapour Lasers. Since 1990 they have manufactured laser-based systems incorporating lasers of all types, with an increasing emphasis on solid state lasers.


Micromachining


Laser Drilling

50µm SQUARE HOLES IN SiN, IMAGE COURTESY OF OXFORD LASERS

Micro-hole drilling is possible for pinholes, nozzles, orifices, vias, photovoltaic cells etc. Very high position and diameter tolerances (less than 1µm) can be achieved.
Technology From: Oxford Lasers

Laser Drilling

Laser drilling can be used to produce micro-holes in almost any material. Warsash Scientific offer laser drilling systems and services for micro-hole production and R&D.

Micro-hole drilling is possible for pinholes, nozzles, orifices, vias, photovoltaic cells etc. Very high position and diameter tolerances (less than 1µm) can be achieved.

A number of proprietary processes have been developed to optimise the laser micro hole drilling process and enable laser drilling of highly accurate small holes. These proprietary micro drilling techniques, coupled with the most appropriate choice of laser for the job, enable us to micro-drill nozzles etc. with a very high diameter accuracy and controlled taper for a wide variety of applications.

These systems and services have been used to manufacture micro-holes in fuel injection components, vertical probe cards, metered dose inhaler products, pinholes and slits for scientific instrumentation, inkjet printer nozzles, detectors, sensors, high resolution circuitry, fuel cells, fibre optic interconnects and medical devices.

Micro-holes can be laser micro-drilled in metals, ceramics, diamond, silicon and other semiconductors, polymers, glass and sapphire using industrial visible and UV systems. Laser microdrilling systems are available to suit most micro-hole production and R&D requirements.

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Laser Cutting

100µm CURVED CHANNELS ON POLYMER, IMAGE COURTESY OF OXFORD LASERS

Laser precision cutting is an attractive micromachining technique for most materials. Features down to 1 micron wide and up to 2mm deep can be machined.
Technology From: Oxford Lasers

Laser Cutting

Laser precision cutting is an attractive micromachining technique for most materials. Features down to 1 micron wide and up to 2mm deep can be machined.

Almost any type of material can be micro-cut. Materials which can be machined include:

  • Metals: stainless steel, hardened steel, copper, aluminium, brass, tungsten, titanium
  • Ceramics: alumina, zirconia, machinable ceramics, green ceramics, PZT, silicon nitride, tungsten carbide
  • Super hard materials: diamond, silicon nitride, tungsten carbide
  • Plastics: polyimide, PTFE, PMMA, Kapton, Vespel, Cirlex, ABS
  • Glasses and crystaline materials: BK7, sapphire, fused silica
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Laser Micromilling

DIAMOND MEANDER DEVICE, IMAGE COURTESY OF OXFORD LASERS

Micro-milling can be used to create 2.5D features in the surface of most materials. With the appropriate choice of process conditions surface roughness below 1 micron can be obtained.
Technology From: Oxford Lasers

Micromilling

Micromilling can be used to create 2.5D features in the surface of most materials. With the appropriate choice of process conditions surface roughness below 1 micron can be obtained.

Laser Micro Milling is simple in concept. Each laser pulse ablates a very small amount of material. The laser is scanned across the surface to produce the desired feature. The number of pulses at each position determines the depth of the feature. In practice the quality of the result is strongly dependent on the choice of laser and the scanning strategy adopted. In many cases the morphology of the starting material is also important with fine grained or amorphous materials producing the best results.

Complicated laser micromachining can be applied to to a wide range of materials.

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Marking and Engraving

MARKING ON COPPER, IMAGE COURTESY OF OXFORD LASERS

Patterns or shapes can be engraved onto any material. Decorative markings or barcodes can be written at high speed with high accuracy.
Technology From: Oxford Lasers

Marking and Engraving

Patterns or shapes can be engraved onto any material. Decorative markings or barcodes can be written at high speed with high accuracy.

Laser micro-engraving and micro-marking is really a sub-set of laser micro-milling. Small amounts of material are removed by each laser pulse. The laser beam is scanned over the surface to produce the desired pattern. By altering the number of pulses at each point the depth of mark can be controlled.

For ultra-clear marking it is often desirable to coat the substrate with a high contrast surface layer. Laser ablation of this layer exposes the underlying substrate material to give a vey high contrast mark.

Microfeatures down to approximately 10 microns in diameter can be produced. 2-D barcodes can be produced with pixel sizes down to 50 microns.

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Scribing and Dicing

100µm TRACK ON GLASS, IMAGE COURTESY OF OXFORD LASERS

Lasers can be used to scribe fine features in any material. This can be for surface patterning, dicing or as the first step in a "scribe and break" process.
Technology From: Oxford Lasers

Scribing and Dicing

Lasers can be used to scribe fine features in any material. This can be for surface patterning, dicing or as the first step in a "scribe and break" process.

Fine slots can be cut in almost any material including: ceramics, silicon, sapphire, metals and glass. These very fine slots can be used directly, as in the Laser Groove Buried Grid (LGBG) process in photovoltaic cell production.

Alternatively the slot weakens materials in a very controlled manner, prior to applying a force to fracture the material. The very fine control over the scribing leads to an extremely well defined break, which is clean and free of micro-cracking. This is often used in the electronics industry for dicing silicon wafers and ceramic sheets and in the solar power industry for cutting up photovoltaic cells for solar concentrators.

In addition to scribing, most materials under 1mm thick can be micro-cut through using a laser. This eliminates the breaking step but lengthens the process time. Laser micro-cutting is often used for dicing small batches while scribing is used for volume production.

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Imaging


Particle Sizing

Particle Sizing, Image Courtest of Oxford Lasers

In addition to measuring the particle diameter distribution, imaging systems also provide real-time shape and velocity analysis.
Technology From: Oxford Lasers

Particle Sizing

Image based analysis for size distribution measurement is ideal for measuring the size and shape of particles, droplets or bubbles. Online droplet sizing systems capture high-speed images of a particle cloud, spray (e.g. for water droplet size measurement) or bubble stream to give the drop size. In addition to measuring the particle diameter distribution, imaging systems also provide real-time shape and velocity analysis.

Key Features
  • Measure particle or droplet size in real time
  • Measure particle or droplet velocity and direction
  • Measure individual particles
  • Capture images of the particle in flight
  • Make non-intrusive measurements
  • Make in-situ measurements
  • Report on-line, real-time results
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Spray Pattern Analysis

Spray Pattern Analysis, Image Courtesy of Oxford Lasers

Spray patternation systems capture images of the spray and calculate its pattern, cone angle/plume geometry and time evolution.
Technology From: Oxford Lasers

Spray Pattern Analysis

Spray Pattern Measurement Systems are used for characterisation of many types of spray including: nasal sprays, MDI (metered dose inhaler), DPI (dry powder inhalers), agricultural, water, paint, fuel injectors and domestic aerosols. Spray patternation systems capture images of the spray and calculate its pattern, cone angle/plume geometry and time evolution. Optional software and hardware allow droplet size measurement and velocity measurement.

Oxford Lasers has developed a number of imaging systems for aerosol characterisation that allow measurement of all these parameters using image analysis.

In addition to providing quantitative data, the Envision systems can provide images of the break-up and droplet formation process. This can provide an extremely valuable insight into the process and aid product development and troubleshooting.

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Flame and Weld Viewing
Sparkler with Visibrite
Technology From: Oxford Lasers

Flame and Weld Viewing

Flame penetration imaging can be used to take movies through flames, arcs and explosions. When an arc or laser welding process is imaged with a normal imaging system, the high brightness of the plasma saturates the camera and no detail can be seen. VisiWeld systems eliminate the glare to give a clear image of the weld process.

Images courtesy of Oxford Lasers.

Flame and Weld Viewing
Sparkler without Visibrite
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Vector Analysis (PIV)

Vector Analysis (PIV), Image courtesy of Oxford Lasers

Vector Analysis is a very powerful technique for performing flow velocity measurements in air or water or for measuring spray droplet/particle velocity.
Technology From: Oxford Lasers

Vector Analysis (PIV)

Particle Image Velocimetry systems are used for flow velocity measurements in liquids and gases. In addition to supplying conventional 2D PIV, stereo PIV, micro PIV and High speed (Time Resolved) systems, Warsash Scientific supplies stand-alone dual pulse and high repetition rate lasers, cameras and PIV software. These systems can also be used for flow visualisation.

Vector Analysis is a very powerful technique for performing flow velocity measurements in air or water or for measuring spray droplet / particle velocity using VidPIV - PIV Software . In addition, the same hardware can be used for flow visualisation and Particle Tracking Velocimetry (PTV).

Vector Analysis Systems from Oxford Lasers offer an unparalleled choice for flow measurement/visualisation. The VisiVector range includes standard 2d/planar, stereo/3D, high speed/time resolved and micro.

Key Features
  • 2D/Planar provides velocity measurement in a single plane, normally at frame rates up to 15 image pairs/second
  • Stereo/3D systems use a pair of cameras to provide stereo/3D measurement of velocity
  • High speed/time resolved products use high speed cameras and high repetition rate, double pulse lasers to take thousands of image pairs per second to provide time resolved velocity data
  • Micro systems view via a time resolved system and provide flow measurement in microfluidic devices
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High Speed Imaging
Laser Spray Illumination
Technology From: Oxford Lasers

High Speed Imaging

Visilase systems combine high-speed cameras with pulsed lasers to offer the most powerful imaging systems in the world of R&D. The short-pulse lasers enhance camera performance by illuminating subjects with ultra-short pulses of light. Image blur is eliminated, even for subjects moving at high velocity. The laser light can also be formed into a thin sheet (known as a lightsheet) to take a 2D slice through a turbulent 3D flow, for flow visualisation.

Images courtesy of Oxford Lasers.

High Speed Imaging
Conventional Spray Illumination
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All products and information are subject to change without notice.