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 ( (o) & (e) avg. )

Wavelength, nm	157	193	248	308	350
Refractive Index (n)	1.464	1.428	1.4097	1.398	1.393

   

  

 

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                                      

Wavelength, nm	157	193	248	308	365
Refractive Index (n)	1.559	1.501	1.468	1.452	1.445

 

 

  

 

Sapphire:  Sapphire (Al2O3) exhibits good transmission over the range extending from ~ 150nm in the Vacuum UV (VUV) to ~ 5.0um in the Mid-Infrared.  Sapphire is an exceptional hard material; is chemically inert and insoluble to water, common acids, or alkalis at temperatures up to ~1,000 °C. Sapphire is typically oriented so that the c-axis of the crystal is parallel with the optical axis.

 

                          Sapphire (Al2O3) Refractive Index ( (0) & (e) avg.)

 

 

 

 

 

 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  

Wavelength, nm	193	248	308	355	405
Refractive Index (n)	1.561	1.508	1.485	1.476	1.469

 

 

 

                             

 

                      
                     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.

 

                        

                             

                                        N-BK7 Glass Refractive Index  

Wavelength, nm	365	405	546	706	850
Refractive Index (n)	1.536	1.530	1.519	1.513	1.509

                                                                            

                      

 

                                   

 

                                   VUV-UV Optical Materials % Transmission Overview:           


                                                                        
                     

 

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