Refractive lenses

• Round and cylindrical lenses
• Apertures ~15-2000 µm diameter
• Sag up to ~100 µm

 

Diffractive elements

• 2-level or multiple levels (4, or possibly 8 with limitations)
• Features sizes >1.5 µm (period 3 µm)
  

 

Materials

• Silicon: n = 3.5  for λ = 1.1 – 10 µm (NIR to IR)
• Fused silica: n = 1.45 for λ = 0.2 – 2.5 µm (UV to IR)

 

See also: Advantages