Monday, 26 March 2018

Color Balanced Green Laser filter (532nm)

Brinell Vision Limited

Brinell Laser protection eyewear shop

Colour balanced green laser protection filters

(Brinell 532nm CN-Green technology)

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 Europe’s top laser protection manufacturer Protect Laserschutz GmbH and are also available from our shop:

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 to >6+

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

      Colour optimisation for green laser blocking filter (532nm at OD6)

Brinell Laser protection filter shop

Visit our internet shop for Brinell dedicated laser Protection Eye-wear

Brinell Laser protection eyewear shop


Thursday, 9 June 2016

Brinell 0166 Laser glasses for UV, KTP, Nd:YAG (1064nm)

Is it possible to block laser and see it at the same time? With Brinell Vision Convex 166 you can.

The new Convex 0166 is able to completely block 473 and 532nm lasers but lets you see the laser position using fluorescence emitted from the special absorption dye.

Blocking is up to LB5 for 473nm and 532nm however the new product provides an excellent alignment function.  The new glasses are suitable for Excimer, UV, harmonic Nd:YAG (266nm-355nm-532nm-1064nm), KTP, Ti:Sa, Diodes, Disc, Nd:YAG. 


Laser Safety Glasses Filter 0166 model is a special plastic filter with LB4 to LB7 protection level for Excimer, UV, harmonics of Nd:YAG (266 nm + 355 nm + 532 nm + 1064 nm), KTP, Ti:Sa, diode, disc, Nd:YAG. This Laser Safety Glasses Filter 0166 is mounted with CONVEX Aluminium enforced Frame model.

  • Application:UV, Argon, KTP, Nd:YAG harmonic
  • Material:Special plastics
  • Filter colour:amber
  • Visible Light Transmission. 22%
  • Very large field of vision by curved lenses
  • Sporty look
  • Low weight
  • Narrow covering on upper edge and sides
  • Side arm length and inclination are easily adjusted to fit each user
  • Also available with RX-clipin
  • Available with selected filters

Purchase directly from Brinell Vision UK: BrinellVision.EU Internet Shop

More technical information and protection levels: Brinell Convex 0166 Laser Protection eyewear

or contact us:

Wednesday, 1 June 2016

Advanced IR Laser filters for Nd:YAG, Holmium:YAG and Erbium:YAG

Brinell Laser protection eyewear shop

There are important features which need to be built into the new generation of optical filters used in high powered medical lasers such as Nd:YAG, Holmium:YAG and Erbium:YAG. These are low absorption, low thermal drift and optical stability in all modes of operation.

The technology for creating these new thin film infrared filters has been developed over the last nine years. We have moved away from distinctive alternating layers of different materials and moved into blended structures of environmentally clean and inert dielectric materials. These are deposited using a high energy Pulse Plasma Beam Sputtering process (PPBS). The method also allows us to produce optimised optical characteristics using advanced optical design software.

The filters exhibit fully dense and amorphous compositions and can maintain optical stability in extreme environmental conditions. The picture below shows a fully dense bragg mirror with a Laser Damage Threshold more than 10 times that of the best Plasma assisted evaporated coating. The mirror survived a NdYAG beam of more than 106 Joules/square meter.

High durability advanced thin film interference filters with low absorbing design to work with high powered laser sources. Customer specified optical characteristics for blocking and transmission bands. 
-optically stable/low thermal shift in CWL
-low absorption
-no ‘Burn out’
-operation at high temperature

Brinell Vision filters use sputtered thin film technology to block unwanted radiation rather than layers of cemented absorption glass (as used in traditional filters). This allows the filter to operate at high temperatures without optical drift or complete breakdown.
·         Nd:YAG, Holmium:YAG and Erbium:YAG
·         Laser band pass filters for radiation clean-up
·         Laser protection filters
·         Laser blocking filters with pilot beam
·         Laser blocking filters with High VLT

For more information contact:

        Brinell 2080nm Holmium 'clean-up' laser filter.

Visit our internet shop for Brinell precision medical Laser eye-wear: 

Brinell Laser protection eyewear shop

Thursday, 21 May 2015

Advanced Lightweight Laser Protection eyewear for Medical Lasers

Brinell Laser protection eyewear shop

Advanced Lightweight Laser Protection eyewear for Medical Lasers

Laser eyewear using dyed Plastic lenses have by far become the most popular format over the last 20 years. The main driver has of course been cost however laser filters based on plastic lenses also have other advantageous features such as low weight and good resilience in case they are dropped from the surgical bed! The downside is the transmission properties are quite often not desirable due to the broad-band absorption nature of the dyes used which introduce colour and also provide lower power handling capabilities. Traditional glass filter lenses such as Schott & Hoya filter glasses still have the upper-hand on the basis of general colour balance, transmission and power handling especially for standard IR laser used in surgery such as Nd:YAG (1064nm) and Holmium (2100nm). They also have an advantage in that they can be coated with optical thin- film stacks to increase laser power handling or wavelength coverage. 

Glass filters make eyewear heavy and cumbersome for long medical procedures

For doctors operating lasers for critical applications such as tissue ablation, incision and coagulation consideration should be given to optical performance such as lens clarity, light transmission and colour balance. Glass filters are generally chosen for these critical applications however they can often make eyewear heavy and cumbersome especially in the case of a long medical procedure.

The ideal solution to this issue is to provide laser coatings onto plastic lenses, this can provide lower weight filters along with higher optical performance in terms of transmission and colour balance. Another important advantage of laser coated lenses is that they can be supplied with a prescription so that the user no longer has to wear over-glasses on top of their own prescription glasses. This reduces problems with ghost images from multiple internal reflections and lens aberrations and so improves visual clarity during these critical operations. However depositing thin, hard dielectric layers onto plastic lenses has always been a challenge and it is only in the last 10-15 years that standard AR coating for Ophthalmic lenses has become reliable on most plastics. Most Ophthalmic coatings use 6-8 thin-film layers to create the anti-reflection (AR) properties on the other hand laser blocking coatings often need in excess of 50-60 layers deposited to nanometre accuracy. There is a limit in processing temperatures used during coating due to the plastic substrate and so these large thin film stacks can be soft and have low laser damage thresholds without use of more advanced coating technology such as Ion Assisted Deposition or Plasma Ion Assisted Deposition.

Fig 1. A high powered Argon/Oxygen plasma source on left hand side and electron beam evaporation of metals on the right hand side. The pure materials are evaporated into a carefully controlled oxygen plasma before depositing on the lens surface as dielectric layers with nanometre accuracy.

There are a small number of products utilising coated plastics for Laser protection available generally in specialist medical areas such as Nd:YAG and Holmium laser surgery. However currently there is a limit to the number of layers which can be deposited and subsequently the performance in terms of power handling and laser blocking (Optical Density) due to the large levels of stress incorporated into the films during processing. Without careful management of materials and intrinsic film stress these types of coatings will always be prone to failure in standard use.

Fig 2. A coated plastic lens from Laser protection eyewear for Holmium medical lasers used in Urological surgery after standard post-surgical cleaning. Intrinsic stress within the deposited layer stacks causes complete coating failure with the introduction of just a small surface defect.

 Advanced Plastic Laser Protection Lens technology

Brinell Vision has developed a laser coated plastic lens which surpasses standard thermal shock, abrasion tests and long term environmental exposure. The solution has been made by stripping all the production steps right back down from selection of the plastic pellets used in the lens molding process, advanced lens surface treatments to development of the proprietary coating materials and deposition method.

The Brinell Laser lens is molded and treated using a blend of specifically chosen materials to provide the capability to accept large stacks of dense dielectric thin films. Core to the deposition technology is the high energy plasma and custom designed advanced computer controlled tooling system which allows us to deposit the optical layers onto curved surfaces with nanometre accuracy. The deposition parameters have been optimised for limiting stress while effectively hardening the surface of the plastic. It is now possible to create plastic lenses with narrow notch filters in the visible for blue and green lasers using over 100 individual optical layers to create deep blocking capabilities. This development is a significant move forward in eyewear for medical laser surgery as the product combines the advantage of low weight plastic with the optical properties of high grade glass laser filters.

Fig 3. Shows Brinell Vision custom designed prescription eyewear for blocking green and NIR lasers. The base6 curved lens substrates are coated with over 100 individual dielectric thin films to provide maximum visible transmission and high levels of blocking for green (532nm) and NIR (1064 & 2100nm).

For more information contact:

Tuesday, 10 June 2014

Diode Laser filters for Medical and Dental applications.

Visit our internet shop for Brinell dedicated Laser Protection Eye-wearBrinell Dental Eyewear

Lasers have revolutionised surgical procedures, minimising swelling, bleeding and pain. Now Lasers are also beginning to radically change the way Dentists approach the most common treatments. Diode lasers in the 810nm –1,000nm range are well absorbed by red coloured tissues such as the gingivae increasingly being used in place of electrosurgery and standard surgery for soft tissue applications such as tissue contouring and gingivectomy. 980nm Diode lasers are also commonly used in soft tissue treatments such as sterilization of canals in endodontics.

Unfortunately Diode lasers differ from gas or solid state lasers in that their wavelength can vary significantly from laser to laser. In addition they are not stable during their lifetime or with temperature variation. This makes it difficult for the equipment manufacturers to accurately characterise the performance and surgical end results.
We have developed a class leading optical filtering technology which will clean-up and maintain a stable laser output in all types of harsh conditions including major variations in temperature. Brinell DL Plasma beam sputtered filters are ultra hard, non-absorbing and resistant to temperature variations as high as 500 degrees C due to their unique chemical and physical make-up.
                              980nm emission filter for soft tissue diode laser system.
In some cases Diode lasers are running close to their maximum output, many clean-up filters add to this problem by only transmitting 60-70% of the available power and absorbing some of the radiation. This in leads to laser and filter instability. Brinell DL plasma beam sputtered filters provide in excess of 92% transmission at the centre wavelengths and highly efficient blocking up to OD6 without absorption. This ensures maximum power is delivered to the place where it is required.

Visit our internet shop for Brinell dedicated laser Protection Eye-wearBrinell Dental Eyewear

For more information e-mail: or visit: