TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

50.0mm Dia. x -100 FL, YAG-BBAR, Plano-Concave Lens

Stock #21-322 In Stock
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Diameter (mm):
Effective Focal Length EFL (mm):
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Numerical Aperture NA:
YAG-BBAR (500-1100nm)
Plano-Concave Lens
Wavelength Range (nm):
500 - 1100
Back Focal Length BFL (mm):
Protective bevel as needed
Center Thickness CT (mm):
5.00 ±0.10
Centering (arcmin):
Clear Aperture CA (mm):
Coating Specification:
Rabs <0.25% @ 532nm
Rabs <0.25% @ 1064nm
Ravg <1.0% @ 500 - 1100nm
Edge Thickness ET (mm):
Focal Length Specification Wavelength (nm):
Focal Length Tolerance (%):
Radius R1 (mm):
Surface Quality:
Damage Threshold, By Design: Damage threshold for optical components varies by substrate material and coating. Click here to learn more about this specification.
5 J/cm2 @ 532nm, 10ns
Power (P-V) @ 632.8nm:
Irregularity (P-V) @ 632.8nm:

Regulatory Compliance

RoHS 2015:
Certificate of Conformance:
Reach 235:

Product Family Description

  • Negative Focal Lengths for Beam Expansion or Light Projection Applications
  • Optimized for R<0.25% at both 532nm and 1064nm
  • AR Coated to Provide <1.0% Reflectance per Surface for 500 - 1100nm
  • Various Coating Options: Uncoated, VIS-EXTMgF2, VIS 0°, VIS-NIR, NIR I, NIR II, and 1064nm V-Coat

TECHSPEC® YAG-BBAR Coated Plano-Concave (PCV) Lenses are designed to bend parallel input rays to diverge from one another on the output side of the lens causing this lens to have a negative focal length. These lenses can be used for balancing aberrations created by other lenses within a system due to their negative spherical aberration. Plano-Concave (PCV) lenses are commonly used in a variety of applications including image reduction, beam expansion and telescopes. TECHSPEC® YAG-BBAR Coated Plano-Concave (PCV) Lenses feature less than 0.25% reflection at common Nd:YAG laser wavelengths of 532nm and 1064nm. These lenses are also available Uncoated, VIS-EXTMgF2VIS 0°VIS-NIRNIR I, or with NIR II AR coating options.