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

Home | Grin Lens Specification |Fiber Collimator  C-Lens Contact Us   Links 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. 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. 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