Fused Silica Plano-Concave Lenses

 

Concave lenses convert incoming parallel rays in diverging ray bundles that seem to originate from a single point in the object space – the so called imaginary focal point. Like plano-convex lenses these lenses minimize aberrations for absolute conjugate ratios more than 5 or less than 1/5. For this, plano-convex lenses should be placed with parallel beam entering the curved side of the lens. However such an orientation of a lens may be disadvantageous and even dangerous when a plano-concave lens is used to diverge a high power pulsed laser beam. A rest-reflexion from the curved surface will produce a real secondary focus that can damage optical elements preceding the concave lens or even causing a laser break-down at this point. By high power applications the concave surfaces should be oriented in such a way that a secondary focus is avoided.

 

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Material:    Fused Silica
Focal Length:    +/- 2 %
Design Wavelength:    546,1 nm
Diameter Tolerance:    +0/- 0.2 mm
Centering:    < 5 min. of arc
Wavefront Distortion:    λ/10
Clear Aperture:    90 % of diameter
Surface Quality:    S/D 10-5
Antireflection Coating:    on request
Lens mounted in cell:    on request

 

Other dimensions and focal lengths on request: list of radii

Part-No. Diameter Focal Length Price €
LPV0.5"Q/-25 0.5" -25 mm 67 ,--
LPV0.5"Q/-50 0.5" -50 mm 59 ,--
LPV0.5"Q/-75 0.5" -75 mm 59 ,--
LPV0.5"Q/-100 0.5" -100 mm 59 ,--
LPV0.5"Q/-150 0.5" -150 mm 59 ,--
LPV0.5"Q/-200 0.5" -200 mm 59 ,--
LPV0.5"Q/-250 0.5" -250 mm 59 ,--
LPV1"Q/-30 1" -30 mm 65 ,--
LPV1"Q/-50 1" -50 mm 63 ,--
LPV1"Q/-75 1" -75 mm 61 ,--
LPV1"Q/-100 1" -100 mm 57 ,--
LPV1"Q/-125 1" -125 mm 57 ,--
LPV1"Q/-150 1" -150 mm 57 ,--
LPV1"Q/-200 1" -200 mm 57 ,--
LPV1"Q/-300 1" -300 mm 57 ,--
LPV1"Q/-400 1" -400 mm 57 ,--
LPV1"Q/-500 1" -500 mm 57 ,--
LPV1"Q/-750 1" -750 mm 57 ,--
LPV1"Q/-1000 1" -1000 mm 57 ,--
LPV2"Q/-100 2" -100 mm 149 ,--
LPV2"Q/-150 2" -150 mm 149 ,--
LPV2"Q/-250 2" -250 mm 149 ,--
LPV2"Q/-300 2" -300 mm 146 ,--
LPV2"Q/-500 2" -500 mm 146 ,--