Mirror is a smooth,highly polished surface covered a thin coating.Mirror is usually a thin coating of metal or dielectrics.    
VY Optics designs and manufactures a great choice of various high and partially reflecting mirrors for the spectral range:UV,visible,near infrared,and infrared regions.Metallic coatings are more broadband while dielectric coatings are more efficient. 
Selecting the proper mirror for your application requires making a number of choices.A few of the many considerations include:Reflectivity,Laser Damage Resistance, Coating Durability,Thermal Expansion of the substrate,Wavefront Distortion,Scattered Light,and certainly Cost. 

Flat mirror,concave mirror,convex mirror,hot mirror,cold mirror,laser mirror,dielectric mirror,metal coated HR mirror,hyperbolical mirror etc.. 
Specifications of our mirror as follow: 
*Material:BK7 A glass, Quartz, CaF2,crystals or others
*Clear Apenture:90%
*Squares/Rectangles:1mm to110mm+/-0.2mm 
*Center thickness tolerance:+/-0.1mm 
*Surface quality:60-40 to 20/10 Scratch/Dig
*Surface flatness:lambda/10 at 632.8nm
*Parallelism:1 Arc min