
Analyzer, Testing Equipment
61-6900-23 Plano Concave Lens BK7 φ30mm Focal Length -35mm SLB-30-35N
Product Description
Product Model: 61-6900-23Product Brand: SIGMAKOKI CO., […]
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Product Details
Product Model: 61-6900-23
Product Brand: SIGMAKOKI CO., LTD.
Features
- With a simple shape, collimated laser light can be spread.
- It can be ***d in combination with a convex lens to increase the beam diameter or the illumination area.
- A lens made by BK7 for the visible to near-infrared range.
- Three types of lenses with anti-reflection film are available in the visible, near-infrared and infrared ranges.
- It can be selected according to your specifications from a wide range of variations, subdivided by outer diameter size and focal length.
- * The concave lens cannot collect light or tie a real image by itself.
- * Use in combination with convex lenses.
- * Spherical flat concave lenses have chromatic aberration, and the focal length dep***s on the wavelength.
- * Flat concave lenses allow light to enter.
- * Allow parallel light to enter from the concave side.
- * Doing the reverse operation will ca*** spherical aberration to increase, which may result in poor optical performance of the optical system.
Spec
-
[
common specification]
- Material: BK7
- Design wavelength: 546.1nm
- Refractive index: n e=1.519
- Coating: No coat
- Effective diameter: 90% of the outer diameter
- Scratch - dig: 20-10
- [Individual specification]
- Reflective prevention film coat wavelength region: No coat
- Outer diameter φD: φ30mm
- Focus distance f: ?35mm
- Edge thickness te: 9.9mm
- Center thickness tc: 2mm
- Back focus fb: ?36.3mm
- Curvature half diameter r: 18.17mm
- Eccentricity: <1′
- RoHS conform product
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