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BK7 window is the most common type of
window. It has good performance over visible and near infrared wavelength region. BK7 window is ideal for applications require minimal transmitted beam deviation.
BK7 is a borosilicate crown
glass. This material is a relatively hard glass, which performs well in chemical tests so that special treatment during polishing is not of necessity. The bubble and inclusion content of BK7 is very low, with a cross-section total less than 0.029mm2 per 100cm3. Besides, BK7 enjoys excellent transmittance, at wavelengths as low as 350nm. The special glass is also useful in applications requiring a high index of refraction. |
