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SELFOC® MicroLensThere are two categories of lenses, both distinguished by a different numerical aperture: SLW (wide)and SLH (high). Each NA type is appropriate for different applications and exhibits different alignment sensitivities (see Technical Charts Table 2).While the numerical aperture is a maximum at the center of the lens aperture, the actual NA is a function of the ray parameters (height and angle) for each ray that strikes the lens’ surface.
Click to the Appendix of this guide for an illustration of how the NA depends on these parameters.SEFLOC® SLC-180 Collimating LensFeatures:. Low Insertion Loss. Improved Collimation. Drop-In Replacement for SLW-180 SELFOC LensApplication:. Optical Isolators.
Collimators. DWDM DevicesThe SLC-180 SELFOC Collimating Lens is designed for use in demanding telecommunication and data communication applications. The compact size, convenient shape and high optical efficiency contribute to its world-wide recognition as a unique and economical solution to many optical design challenges.Because of its very low insertion loss, the SLC-180 helps support the ever-increasing need for ultra low loss, high bandwidth telecommunications systems. Typical insertion loss for this lens is only 0.1dB per pair. Applications for the SLC-180 include optical isolators, collimators and DWDM devices.
SELFOC® MicroLens – Technical ChartsTable 1 Common Characteristics ITEMSPECIFICATIONSNOTESOPTICALMaximum Pitch0.75PLens length Z = 2πP / √ALens Effective Diameterapprox. Physics of SELFOCThe Gradient ConstantThe SELFOC lens utilizes a radial index gradient. The index of refraction is highest in the center of the lens and decreases with radial distance from the axis.
The following equation describes the refractive index distribution of a SELFOC lens:Equation 1:N(r) = N 0(1 – ((√A) 2/2). r 2)This equation shows that the index falls quadratically as a function of radial distance. The resulting parabolic index distribution has a steepness that is determined by the value of the gradient constant, √A. Although the value of this parameter must be determined through indirect measurement techniques, it is a characterization of the lens’ optical performance.
How rapidly rays will converge to a point for any particular wavelength depends on the gradient constant. The dependence of √A and N 0, on wavelength is described by the dispersion equations listed at the end of this product guide.
Note that different dispersion equations apply to different lens diameters and numerical apertures.Lens Length & PitchIn a SELFOC lens, rays follow sinusoidal paths until reaching the back surface of the lens. A light ray that has traversed one pitch has traversed one cycle of the sinusoidal wave that characterizes that lens. Viewed in this way, the pitch is the spatial frequency of the ray trajectory.Equation 2:2πP=(√A).ZThe above equation relates the pitch (P) to the mechanical length of the lens (Z) and the gradient constant. The figure below illustrates different ray trajectories for lenses of various pitch. Notice how an image may be formed on the back surface of the lens if the pitch is chosen appropriately.Paraxial OpticsIn contrast to the optics of homogeneous materials, gradient-index optics involve smoothly-varying ray trajectories within the GRIN media. The paraxial (first-order) behavior of these materials is modeled by assuming sinusoidal ray paths within the lens and by allowing the quadratic term in Equation 1 to vanish in the ray-tracing calculations.
All of the usual paraxial quantities may be calculated with the help of the ray-trace matrices given at the end of this product guide. The formulae for common paraxial distances have also been tabulated for quick reference. Recommended Storage and Handling of LensesStorageFor extended periods of time, the lenses should be stored in a “dry box” environment (40%RH or less). This entails the use of a desiccant (e.g., silica gel) or a heat source to prevent humidity from leaching the lens material.
This is much more critical for non-coated lenses, since AR coatings help to protect the lens surfaces from humidity. For short term storage (less than a month), the plastic box and foam packing in which the lenses are shipped will provide adequate storage.In addition to humidity requirement, the lenses need to have sufficient spacing to avoid potential damage such as chipping and scratching from other lenses. For this reason, Go!Foton storage boxes have built-in slots in which the lenses are placed, with surrounding packaging to hold them securely in place.HandlingAfter opening the lens boxes, it is important to exercise extra care in lifting the plastic shield. Particularly with smaller lenses, it is possible that they may cling to the shield and be lost during removal. Lenses should be handled with plastic tweezers, preferably those with a tapered end. Lenses should be picked up out of their individual compartments by firmly holding each by its side surface (not the ends).CleaningAt times it is necessary to clean the lens surfaces due to the presence of some dust or film which may impair the image. Go!Foton generally recommends the use of ethyl alcohol as a cleaning solvent.
Acetone may also be used, without harm to the lens, but it should be pure enough to no leave a residue on the lens’ surface.
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