Economical Plano Concave Lens

Sigma Koki

It is the product that was reduced by one rank from the surface quality of Plano Concave Lens (SLB-N). It can be use in an optical system such as observation or lighting applications that high surface quality is not required.

It has the same specification of Plano Concave Lens (SLB-N) except the surface quality. Unless a laser is used for high-precision experiments, it is recommended.
There are two types of lens. One is a Plano Concave Lens with low spherical aberration and the other is a biconcave lens that is possible to shorten the focal length by a large refraction.
In addition to uncoated products, there are three types of anti-reflection coating for visible, near-infrared, and infrared.

Specifications Order Information

Material	BK7
Design Wavelength	546.1mm
Refractive Index	1.519
Centration	<3′
Coating	Uncoated: the end of the part ‘N’ Anti-reflection coating: the end of the part number ‘NM’, ‘NIR1′, ‘NIR2′
Laser Damage Threshold	Anti-reflection coating: 4J/cm2 Laser pulse with 10ns, repetition frequency 20Hz
Clear Aperture	90% of actual aperture: uncoated 85% of actual aperture: with coating 83% of actual aperture: with coating
Surface Quality (Scratch-Dig)	60-40

In case of specifying a anti-reflection coating 633nm-1064nm to near infrared lens of S-SLB-30-200N.

→ S-SLB-30-200NIR1

Type Of AR Coat	Wavelength Range [NM]	Transmittance [%]
Visible Range	400-700	> Average 99
Near-infrared	633-1064	> Average 98.5
Infrared	750-1550	> Average 98.5