The Transmission Curves and Refractive Index Data represent typical optical material properties of eSource Optics standard Windows, Lenses and VUV-UV Filter & Mirror Substrate materials (based on ~2-3mm Thickness).  Materials transmittance can vary slightly and this data should be used as a reference only.

eSource Optics Window, Lens & Substrate VUV-UV % Transmission & Optical Material Properties:

VUV Grade Magnesium Fluoride:  VUV Grade Magnesium Fluoride (MgF2) exhibits high transmission properties from ~ 110nm Vacuum UV (VUV) to ~ 6.0um in the Infrared.  VUV Grade MgF2 is a relatively hard crystalline material resistant to mechanical and thermal shock.  VUV Grade MgF2 is a birefringent crystal typically oriented along the optical axis to avoid birefringent effects in windows & lenses.  The Refractive Index data listed below is the nominal average 'N' data for both the Ordinary (o) & Extraordinary (e) Rays.  VUV Grade Magnesium Fluoride (MgF2) is used as the substrate material for all eSource Optics VUV Narrowband Optical Filters from 120-130nm. 

                                                         MgF2 Refractive Index 

UV Grade Calcium Fluoride: UV Grade Calcium Fluoride (CaF2) exhibits good transmission properties from ~ 140nm Vacuum UV (VUV) to ~ 8.0um in the Infrared.  UV Grade CaF2 is a relatively soft crystalline material and care should be taken as CaF2 is sensitive to mechanical and thermal shock.  UV Grade CaF2 is a cubic single crystal optical material.  UV Grade Calcium Fluoride (CaF2) is used as the substrate material for all eSource Optics VUV Optical Filters from ~130-150nm depending on FWHM.

                                                          CaF2 Refractive Index                                      

 



Cultured Quartz Crystal: Quartz Crystal exhibits good transmission properties from ~ 147nm Vacuum UV (VUV) to ~ 2.5um in the Infrared.  Quartz Crystal is a very hard crystalline material with low thermal expansion coefficient.  Quartz Crystal is a grown crystalline form of Silicon Dioxide (SiO2) optical material.  Quartz Crystal is used as the substrate material for all eSource Optics VUV Optical Filters from ~150-170nm depending on FWHM.

  

                                           Cultured Quartz Crystal Refractive Index

 






UV Grade Fused Silica:  Synthetic form of silicon dioxide made from SiCl₄  ,which transmits light over a very broad range of wavelengths from ~ 170 nm to 2.5 µm.  UV Grade Fused Silica is a high-purity material which has excellent thermal stability, high transmittance and is used as a UV to NIR material for many optical components.  UV Grade Fused Silica is used as the substrate material for all eSource Optics VUV-UV Optical Filters from 180-320nm.

               
                                                              UV Grade Fused Silica Refractive Index  

                      
                     BK7 Glass: Borosilicate crown optical glass with low bubble content and high homogeneity (same optical properties throughout
                     the material).  BK7 is an excellent visible to NIR material for many optical components.

                                        BK7 Glass Refractive Index  

                                   VUV-UV Optical Materials % Transmission Overview:           


                                                                        
                     

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