Positive meniscus lenses and Negative meniscus lenses
Positive meniscus lenses is convex-concave lens thicker at the center than at the edges. They are used to minimize spherical aberration. When used in combination with another lens, it’s will shorten the focal length, and increase the NA of system.
1. Frequently Used for Beam Focusing Applications
2. Minimizes the Increase in Spherical Aberrations for Multi-Element Systems
Negative meniscus lenses is convex-concave lens thinner at the center than edges. They increase the divergence of the beam without introducing any significant spherical aberration. When used in combination with another lens, they will increase the focal length, and decrease the NA of the system.
1. Frequently Used for Beam Expanding Applications
2. Minimizes the Increase in Spherical Aberrations for Multi-Element Systems
A
lens is understood as a curved sheet of clear glass or plastic that
focuses and refracts light in some way. The curvature of an object
determines how much and in which direction light is bent. Depending on
the shape, lenses can be classified as convex or concave lenses, concave concave lenses are also often used together，also has a wide range of
uses.
Specification:
Material:
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Grade A optical glass or Fused Silica
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Dimension Tolerance:
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±0.1mm(Standard), ±0.05mm(High Precision)
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Center Thickness Tolerance:
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±0.1mm(Standard), ±0.05mm(High Precision)
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Paraxial Focal Length:
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±2%
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Surface quality:
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60/40(Standard), 20/10(High Precision)
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Clear Aperture:
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>85%
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Surface Figure:
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λ/2(Standard), λ/4(High Precision) @633nm
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Centration:
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3 arc minutes
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Bevel:
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<0.25mm×45°
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Coating:
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Upon requirement
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|
Typical Sizes
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|
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Item No.
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Φ(mm)
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f(mm)
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R1(mm)
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R2(mm)
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Tc(mm)
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Te(mm)
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Fb(mm)
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Material
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N-BK7
|
|
|
|
|
|
|
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MNP201
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25.4
|
100
|
33.42
|
89.95
|
4
|
2.39
|
96.01
|
|
MNP202
|
25.4
|
150
|
42.36
|
89.95
|
4
|
2.95
|
145.2
|
|
MNP203
|
25.4
|
200
|
48.75
|
89.95
|
3.5
|
2.72
|
194.51
|
|
MNP204
|
25.4
|
250
|
83.95
|
235.5
|
3.5
|
2.88
|
245.97
|
|
MNP205
|
25.4
|
300
|
94.19
|
235.5
|
3.5
|
2.98
|
296.27
|
|
MNP206
|
25.4
|
400
|
110.92
|
235.5
|
3.5
|
3.11
|
396.06
|
|
MNP207
|
25.4
|
500
|
124.17
|
235.5
|
3.5
|
3.19
|
496.16
|
|
MNP208
|
25.4
|
1000
|
278.34
|
600
|
3.5
|
3.3
|
993.7
|
|
MNN201
|
25.4
|
-100
|
89.95
|
32.51
|
3
|
4.68
|
-98.79
|
|
MNN202
|
25.4
|
-150
|
89.95
|
41.21
|
3
|
4.11
|
-148.06
|
|
MNN203
|
25.4
|
-200
|
89.95
|
47.64
|
3
|
3.82
|
-197.82
|
|
MNN204
|
25.4
|
-250
|
235.5
|
83.18
|
3.5
|
4.13
|
-248.62
|
|
MNN205
|
25.4
|
-300
|
235.5
|
93.33
|
3.5
|
4.03
|
-299.04
|
|
MNN206
|
25.4
|
-400
|
235.5
|
109.65
|
3.5
|
3.9
|
-397.33
|
|
MNN207
|
25.4
|
-500
|
235.5
|
122.74
|
3.5
|
3.82
|
-496.94
|
|
MNN208
|
25.4
|
-1000
|
600
|
277.16
|
3
|
3.1
|
-995.3
|
A
meniscus lens is a lens with two spherical surfaces, one convex and the
other concave. Its center is thicker than the edges. The meniscus lens
offers a smaller beam diameter to reduce beam waste and spherical
aberration.
What
is the difference between negative meniscus lenses and positive
meniscus lenses? Negative meniscus lenses have steeper concavities and
are thinner at the center than at the periphery. In contrast, a positive
meniscus lens has a steeper convex surface and is thicker at the center
than at the periphery.
