GRIN LENS, Gradient Index Lenses, Gold plated coating available for the application of Collimator, Fiber Optics, Isolator, MEMS

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Gradient Index Lens

GRIN Lens
(Gradient Index Lens)

GRadient INdex lens or GRIN lens is used to focus and collimate light sources.  It is widely used in both active and passive fiber-optics components, MEMs and imaging system.

Grin Lens Advantage:

When light rays travels between air and glass, it will change its direction according to the change of index of refraction of the traveled medium.  As illustrated in Fig 1., conventional lens focus light beam by bending lights at its surface through controlling the lens shape and smoothness of its surface.  

Unlike conventional lenses, GRIN lenses focus light by gradually varying the index of refraction within the lens material, rather than the thickness, of the optical element.  Through a precisely controlled radial variation of the lens material’s index of refraction from the optical axis to the edge of the lens, GRIN lens can smoothly and continually redirect light beam to point of focus without the need to tightly-control the surface curvature.  See Fig 2.

Conventionl Lens Profile

Grin Lens Profile

Fig 1. Conventional Lens

Fig 2. Grin Lens

In fiber optics applications, Grin Lens with flat or angle polished surfaces are used to collimate light emitted from an optical fiber or to focus an incident beam into an optical fiber.  AR coatings are usually applied to the end faces to avoid unwanted back reflection. 

The index of refraction of Grin Lens rod is expressed in the following formula:

N( r ) = N0 (1-Ar2/2)

Note: N0  -- Index of Refraction at the Center

r -- Diameter of Grin Lens

A -- Gradient Constant

Fig 3. Distribution of Index of Fraction of Grin Lens

Red Optronics supply low insertion loss Grin Lens at competitive price.  In addition, we offer gold plated/coated Grin-Lens and C-Lens for demanding telecom applications.

Gold Coated Grin Lens

Fig 4. Gold Coated Grin Lens

Application:

  • WDM

  • Collimators

  • Optical Switch

  • Attenuators

  • Fiber-to-optical coupling

  • Laser-to-fiber coupling

Optical Specifications:
 
Transmittance 89% minimum (uncoated)
Maximum Pitch 0.5P
Polarization Reservation 0.99 (no stress)
Lens Effective Diameter 60-70% typical
Diameter Tolerance +0.005/-0.010mm
Length (Z) Tolerance  £ 2.5%
Polishing Tolerance  0/-0.04mm
End Facet Perpendicularity £ 6mrad
Thermal Expansion Coefficient 10×10-6/°C
Maximum Temperature £ 350°C

Physical Specifications:
 
Diameter Tolerance +0.005/-0.010mm
Length (Z) Tolerance  £ 2.5%
Polishing Tolerance  0/-0.04mm
End Facet Perpendicularity £ 6mrad
Ellipticy  £ 5mm
Material Proprietary optical glass
Thermal Expansion Coefficient 10×10-6/°C
Maximum Temperature £ 350°C

Sample Specifications:
 
Product Number RGR-18-023-1550-8D-AR2
Length (Z) Tolerance  £ 2.5%
Diameter  1.8mm +0.005/-0.005mm
Length 4.43mm +0.01/-0.01mm
Pitch  0.23P
Right Angle 90° +/- 20’
8 Degree Wedge 8° +/- 20’
Coating R<0.15%@1550nm
Gradient Constant ÖA: 0.3262
Refractive Index @ Center N0: 1.5910
Insertion Loss: £ 0.15dB

Red Optronics supplies high quality Grin Lens at competitive price..  Please contact us and get a free quote.  For more information, please visit our website at: http://www.redoptronics.com

 


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