| | | Standard Glasses LightPath® Technologies™ manufactures aspheric lenses using several different types of glass. Transmittance of all four glasses is very good over a large wavelength spectrum. The optimum operating temperature should be less than 200 degrees Centigrade. The best cleaning agents are high purity grades of alcohol or acetone, lightly wiped with a soft optical tissue or cotton-tipped swab. The 352xxx Series of Lenses New European (RoHS) and Japanese environmental regulations have restricted the use of lead and other hazardous substances in optical components. ECO550 is an environmentally friendly alternative to conventional moldable glasses. It has similar optical properties to C0550, but does not contain hazardous materials. The 350xxx Series of Lenses Corning® developed a special glass to allow production of highly sophisticated aspheric lenses that are cost effective. The code for this glass is CO550, and its low dispersion (vd=50.40) is key for many applications. In durability it is equivalent to Corning© BCD C2060 or Schott® SKI6. The 370xxx Series of Lenses For aspheric lenses that require a glass with a higher index of refraction, LightPath® also offers lenses made from Ohara® PBH7I glass. Its high index (nd=I.92286) allows designers to minimize aberrations in lenses with high numerical apertures. It has the added benefit of a lower coefficient of thermal expansion. The 390xxx Series of Lenses For aspheric lenses in the mid to long infrared wavelength regions (I to 14pm) LightPath® offers molded aspheric lenses from our Black Diamond ™ chalcogenide glass. See pages 42-45 for details. | | Standard Anti-Reflective Coatings LightPath ® offers a variety of multilayer broadband coatings to reduce the back reflection from a nominal 6% for uncoated lenses. The choice of which AR coating is appropriate depends on the type of glass the lens is made from and the wavelength at which the lens will be used. The 350xxx and 352xxx Series of Lenses MLBB-A coating: Rmax<I.0%, Rtyp<0.4%, from 400-600nm, AOI=0° MLBB-B coating: Rmax<I.0%, Rtyp<0.4%, from 600-I050nm, AOI=0° MLBB-C coating: Rmax<I.0%, Rtyp<0.4%, from I050-I600nm, AOI=0° The following coatings can be done on a custom basis. Please contact your sales representative for information on availability. MLBB-D coating: R„ax<0.25%, Rtyp<0.I5%, from I300-I700nm, AOI.=0-20° MLBB-E coating: R„ax<0.25%, Rtyp<0.I5%, from I800-2400nm, AOI=0-20° SLAR-M coating: R„ax<2.0%, Rtyp<I.50%, at 775nm, AOI=0-20° The 370xxx Series of Lenses MLBB-Q coating: Rmax<0.25%, Rtyp<0.I5%, from I300-I700nm, AOI=0-20° The following coatings can be done on a custom basis. Please contact your sales representative for information on availability. MLBB-O coating: Rmax<I.0%, Rtyp<0.4%, from 600-I050nm, AOI=0° MLBB-P coating: RMAX<I.0%, Rtyp<0.4%, from I050-I600nm, AOI=0° | | |