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19.11.2013
New VG20 filter glass from SCHOTT for maximum protection against harmful infrared radiation
Ideal for use in surgery: lighter weight laser safety glasses now even possible with high color accuracy
VG20 filter glass from SCHOTT protects against harmful infrared radiation better than any other glass. It is designed to protect against red and near infrared (NIR) radiation at wavelengths above 650 nm, the range typically used in lasers and intensive li
The VG20 filter already absorbs 50 percent of the radiation above 565 nm. It even blocks a thousand times better than conventional glass at an infrared wavelength of 850 nm. “With our bandpass filters, we are now able to keep radiation of between 600 and 1100 nm in wavelength away from the eye,” explains Dr.-Ing. Ralf Biertümpfel, Application Manager for Filter Glass at SCHOTT Advanced Optics. Intensive radiation in this frequency range can be extremely dangerous for the human eye when it is emitted by the GaAlAs, InGaAs or Nd:YAG lasers used in medicine or industrial manufacturing.
This extremely good filtering effect is made possible by the many absorbing pigments contained in the glass. “We achieve this by using dissolved copper ions in the glass matrix,” Dr. Biertümpfel adds. Due to the excellent filtering effect, the VG20 filter used can be roughly a third thinner than conventional filter glasses. Safety glasses are thus lighter and more comfortable to wear. At the same time, VG20 also ensures that the wearer is still able to see in true color across all the colors of the spectrum. In fact, even a white surface is still perceived as white. Furthermore, this glass is known for its excellent optical quality. This is achieved using extremely homogeneous glass that is free from striae so that optics can be manufactured that are free from distortion.
High resistance to climatic conditions is yet another key characteristic of this filter glass from SCHOTT. It not only stands up to humidity and resists heat for hundreds of hours, but is also permanently transparent and non-corrosive. The properties of the filter can be improved even further to suit customer-specific applications by applying additional coatings.
For further information:
https://www.schott.com/advanced_optics/english/products/optical-components/optical-filters/optical-filter-glass/index.html
Download link:
http://www.schott-pictures.net/presskit/217227.vg20-en /
SCHOTT is an international technology group with more than 125 years of experience in the areas of specialty glasses and materials and advanced technologies. SCHOTT ranks number one in the world with many of its products. Its core markets are the household appliance, solar power, pharmaceuticals, electronics, optics, transportation and architecture industries. The company is strongly committed to contributing to its customers’ success and making SCHOTT an important part of people’s lives with high-quality products and intelligent solutions. SCHOTT is committed to managing its business in a sustainable manner and supporting its employees, society and the environment. The SCHOTT Group maintains close proximity to its customers with manufacturing and sales units in 35 countries. Its workforce of around 16,000 employees generated worldwide sales of approximately 2 billion euros for the 2011/2012 fiscal year. SCHOTT AG, with its headquarters in Mainz (Germany) is owned by the Carl Zeiss Foundation.
The bandpass filter VG20 from SCHOTT that is only 1 mm thick offers strong absorption in the near infrared range (NIR). Its high transparency inside the visible spectrum also ensures that colors are displayed naturally. Source: SCHOTT.
Further information
SCHOTT AG
Michael Müller
Hattenbergstraße 10
55122 Mainz
Germany
55122 Mainz
Germany
Phone: +49 6131/66-4088
Fax: +49 3641/2888-9141
Fax: +49 3641/2888-9141
