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Lens Specifications

Design Wavelength	980 nm	Magnification
Numerical Aperture		Window Thickness	0.25 mm
Clear Aperture		Laser Window Material / Index	N-BK7/1.5
Effective Focal Length	2.95 mm	Glass	ECO-550
Working Distance		Surface Quality	40-20 Scratch-Dig(Entire Bulk Material)

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352440-B
C440TME-B

Vd number	50.28
CTE (10-6 / °C)	11.62
Thermo optic coefficient (10-6 / °C) (Δn/ΔT)	2.39

Surface R(mm) k A4 A6 A8 A10

Side 1 2.4 -4.45639 0.00526756 -0.00107532 0.000323353 -2.55179e-005

Side 2 -2.39 -0.837177 0.00731001 0.000391002 -0.000125976 2.64515e-005

Side 1 and Side 2 are labeled as ASP1 and ASP2, respectively, on the drawings shown on the Specifications tab.

z	SAG as a Function of Y	A4	4th Order Aspheric Coefficient
R	Radius of Curvature	A6	6th Order Aspheric Coefficient
k	Conic Constant	A8	8th Order Aspheric Coefficient
A2	2nd Order Aspheric Coefficient	An	nth Order Aspheric Coefficient