50.8 Focal Length Germanium Lens IR Optics

Ge has high refractive index, The transmission wavelength for Monocrystal Germanium is 2-12um, it is a common infrared crystal which is widely used for infrared image system and infrared spectrograph systems. Ge has a small absorbency at 10.6um. It is a good material for CO2 lens and windows.Optical PropertiesTransmission Wavelength2000nm-12000nmAbsorptivity (1/cm)1.3*10-3 @ 3800nm 3*10-2 @ 10600nmThermo-optical coeffecient, dn/dT (1/k)4.08*10-4 @10600nmElectrical resistivity5-40 Ω.cm 1-5Ω.cm >50Ω.cm Refractive index range(20ºC)Wavelength(nm)Refractive index(n)Wavelength(nm)Refractive index(n)22004.087980004.005730004.045190004.004038004.0267106004.002850004.0160110004.002560004.0107120004.002170004.0079130004.0018 Manufacture SpecificationsDiameter2-450mmDiameter Tol.+/-0.1Surface Quality60-40 standardFlatness1/4 lambdaChamfer0.25mmx45degreeFocal Length Tol.+/-1%Coating2-14umOur FactoryTestingExhibition ShowSunday Optics attended Laser World in Laser World in Munich,Frankfult Exhibition,SPIE every year.Related Production Linesunday optics also manufacture high precison Lens,prism, powell lens, collimator lens, glass filter, and mirror.FAQ:1. Are you manufacturure? can we see your factory?    Yes. 2. Do you have test report?   Yes, we offer full size test report, about size, focal length, flatness, coating curve, coating plate.3.What is your production quantity everymonth?  It depands on the lens size and precison.4.What is the Minimum quantity?  1pc5.What is your delivery time?   samples: 10-20days6.How should we do if the quality is not good?  Repair or return money. /* January 22, 2024 19:08:37 */!function(){function s(e,r){var a,o={};try{e&&e.split(",").forEach(function(e,t){e&&(a=e.match(/(.*?):(.*)$/))&&1