Tuesday, 13 March 2018

Colour balanced green laser filter technology (Brinell 532nm CN-Green technology)


Color Balanced Green (532nm) laser protection filters

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Greenlight Laser therapy is an innovative, non-invasive procedure which is revolutionising medical procedures in areas like treatment of enlarged prostate and removing tumours in cancer treatment.

The wavelength of 532nm (green) is highly absorbed in the red colour of the haemoglobin and the brown colour of the melanin. This guarantees for safe and successful coagulation and Vaporisation. High-power green KTP lasers provide a way to cut away the tumour, cauterize the area and radiate tissue in a single procedure. It is currently being used in prostate cancer patients, but research suggests that it might prove valuable in the treatment of other cancers as well. A high powered 532nm laser can also be used to destroy surplus prostate tissue which is blocking the bladder in the case of enlarged prostrate.

The laser vaporises excess tissue using safe and precise energy pulses. There is very little bleeding, reduced risks of complications and patients can return home within 24 hours.

Laser protection filters used for infrared medical laser applications such as Nd:YAg and Holmium are relatively straight forward to design as the working wavelengths are outside of the visible area. Good quality products laser protection goggles and filters provide high levels of visibility (VLT) without affecting the colour balance.
Laser Protection eyewear and filters used for 532nm Green Laser is however a much more difficult issue as the laser is operating in the centre of the visible spectrum. Brinell Vision has developed a class leading technology which allows the user to see a completely balanced colour view while totally blocking the laser at 532nm (to levels as high as OD7). Brinell vision CN-Green technology is being used by some of the Worlds top laser optics companies.

Filters for Greenlight Laser (Brinell CN-Green Technology) 

Brinell Vision use an advanced plasma beam sputtering process to create a seamless optical interference coating. The process is tuned to give optimised blocking at 532nm while transmitting a completely colour balanced spectrum in the visible bandwidth.

The materials deposited are completely inert, chemically and optically stable in the harshest environmental conditions.  

-optically stable/low thermal shift in CWL
-low absorption
-no ‘Burn out’
-operation at high temperature
-custom designed and manufactured by Brinell Vision Limited 
-OD from 3 up to 6+

Brinell CN-Green (532nm) protection filter has been carefully colour corrected to give a critical neutral transmision.

Colour optimisation for neutral transmission

Contact us for more information about our advanced medical filter solutions: info@brinellvision.com

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Brinell CN-G Laser Protection filters (Web-shop) 

Wednesday, 28 February 2018

ST Laserstrike, 532nm Laser Strike protection technology from Brinell & Sierra Tango



Aviation safety with ST Laserstrike Eyewear

Pilots view on landing when a green 532nm laser is shone into the cockpit.

Green LASER lights which can blind pilots have been fired at planes landing at Airports leading to some pilots having to cover their eyes and others taking evasive action. On each occasion, a powerful laser pen – which can focus a green beam of light at 532nm over several miles – has been used. The devices, which can cost more than £100 and are generally used by astronomers and scientists, have now become dangerous toys.

A cargo plane from Aberdeen was forced to drop 400ft as it approached the runway to avoid a green beam. An easyJet Airbus carrying 59 passengers and six crew travelling on the same flightpath from Stansted was targeted 30 minutes later. Both pilots were dazzled by the beam, suffering a temporary loss of vision, and were forced to cover their eyes at a crucial point in the descent. 
In March this year two adults were arrested in March after a laser was aimed at a commercial plane near Midway Airport in Chicago. A police helicopter sent to investigate was also illuminated.

Sudden exposure to laser radiation during a critical phase of flight, such as on approach to landing or departure can distract or disorient a pilot and cause temporary visual impairment. Permanent ocular damage is unlikely since the laser source is generally reduced in intensity due to scattering and absorption over the long distances in the atmosphere. In addition the the eye’s blink response could further limit exposure.

However flight simulator studies have shown that adverse visual effects from laser exposure are especially debilitating when the eyes are adapted to the low-light level of a cockpit at night. Recovery of visual performance after exposure to laser light may take from a few seconds to several minutes. This effect could be even worse for example when the glass canopy of a Helicopter is illuminated by green laser. Apart from the obvious distraction of such a flash, the three most commonly reported physiological effects associated with green laser exposures are:

Visual blocking of an object in a person’s field of vision due to a bright light source located near the same line of sight.

Temporary loss of vision after the source of illumination has been removed.

A transient image left in the visual field after an exposure to a bright light.

Laser protection filters for infrared laser applications are relatively easy to design because the wavelengths emitted by such lasers are outside of the visible spectrum. The 532nm wavelength emitted by green lasers, however is in the centre and most sensitive part of the human Photopic region making filter design more of a challenge.

ST Laserstrike has developed a laser safety filter technology which allows the user to see a completely balanced colour view while totally blocking the blue and green laser strikes. In addition the technology provides outstanding visible light  transmission when compared with other types of laserstrike blocking technologies.Other types of blue and green laser filters use absorbing materials which generally remove all the blue and a significant amount of green from the visible spectrum. This makes the eyewear completely unsuitable for flying or in fact operating any piece of important equipment.

The Brinell CN-Green filter has been developed using a combination of advanced thin film  coating with advanced plastics to produce optimised blocking for blue and green lasers while allowing all other areas of the visible spectrum to transmit. This provides outstanding colour balance and high transmission in the visible region of the spectrum. Brinell CN-Green advanced filter technology is already being utilised by world leading optics and laser companies in demanding applications such as medical surgery and astronomy and ST Laserstrike glasses are currently the most advanced Laser Protection eyewear available worldwide.

If you are interested in purchasing Pilot's Laser Strike Glasses you can find more information from: protect@stlaserstrike.com

ST Laserstrike online shop

Thursday, 14 January 2016

ST Laserstrike, Advanced Laser Strike Protection Eyewear for Pilots

Sierra Tango LLC has joined together with Brinell Vision Limited to launch ST Laserstrike eyewear.


Until now, if a pilot wanted to fly with protection from laser strikes, the only option was to wear amber colored view protection; usually in the form of goggles.  While providing the necessary protection from green lasers, it forces the pilot to view the instrument panel through an amber filter making it impossible to distinguish between critical colours within the cockpit. 

ST Laserstrike is the worlds finest laserstrike eye-wear protection  for pilots, designed to equip the user with complete coverage from blue, green & infrared malicious laser strikes while maintaining a clear colour balanced view.

ST Laserstrike glasses incorporate Brinell Vision’s advanced CNG filter technology which is produced at Brinell Vision’s state of the art thin film coating facilities in Dundee, Scotland.  The CNG laser protection filter is made up of more than 100 ultra-thin layers deposited to nanometre accuracy on customised curved polycarbonate lenses using the latest advanced lens moulding and nano thin-film deposition coating techniques. We offer three levels of protection from general low power laser strikes to military class laser protection.

For more information contact: info@stlaserstrike.com
ST LaserStrike

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