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DETAILS

Grin Lens is made of special glass materialwhich make use of the continuous changed by radial of the refractive index, theworking theory may be explained: An incoming light ray is first refracted alongthe high refractive index side, the refractive index of the lens center ishighest, and refractive index (n) continuatively changed low with radial distanceof lens. The light path will transfer as Sin. Curve when the light through theGrin Lens.(see Fig.1).

Grin Lens is an optical lens which use foroptics collimation, optics focus and optical image transmission etc for thiskind of characteristic. The application of Grin Lens’ is the same asconventional lens, performance of the lens depends on a continuous change ofthe refractive index within the lens material, The simple geometry allows us avery cost-effective production and simplifies the assembly of productessentially, just polish the two end surface and control the length, instead ofcomplicated shaped surfaces plane optical surfaces are used for the conventionallens (see, Fig2 and Fig 3.)

Since limited for the special assembly and working theory, the diameter of conventional lens is not very small, for example: less than 1.0mm, at same time, it can’t get the image in very close working distance, such as: in 5.0mm distance, However, the Grin Lens are fabricated down to 1.0mm in diameter and get the image in zero distance.

Specification:

Item

Specifications

Notes

Optical Characteristics

Insertion Lose

≤ 0.25dB

P grade ≤ 0.20dB

Transmittance

β

89%

Wavelength Range380nm~2000nm

Refractive Index

N。

1.5906

@1500nm

Lens Effective Diameter

d

60-70% lens diameter

For low loss and low aberration

Index Gradient Constant

A

0.320

Lens Diameter is 1.8mm

A Tolerance

±0.75%

Within same ion exchange batch

±2.5%

Between ion exchange batches

Numerical Aperture

NA

0.46

Lens Diameter is 1.8mm

Pitch

P

19.6349

P=2π/ A

Mechanical Characteristics

Lens Diameter Tolerance

+0.005/-0.010 mm

Lens Length Tolerance

0/-0.04 mm

End Face Angle

8°±0.5°

Ellipticity

3μm

End Face Perpendicularity

6mrad

Thermal Expansion Coefficient

10X10-6/

Temperature

350

Max operating temp.for lens material

Humidity

65%―85% HR

Store in desiccant to avoid moisture

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