Abstract:
A method for the manufacture of TIR holograms includes the division of an input laser beam into an object beam (15) and a reference beam (16), the direction of the beams to a holographic recording layer so that the object beam is incident on a surface of the holographic recording layer (8) following transmission through an object mask (11), so that the reference beam is incident on the other surface of the holographic recording layer at an angle such that following passage through the holographic recording layer it is totally internally reflected back into the holographic recording layer and so that the two beams are superposed at the holographic recording layer, and the displacement of the input laser beam causing the object and reference beams to traverse together the holographic recording layer. The method is especially useful for obtaining a high uniformity of exposure of the holographic recording layer.
Abstract:
A method is disclosed for changing the scale of a pattern printed from a total internal reflection hologram (9) into a photosensitive layer (13) that includes reconstructing an image from the total internal reflection hologram by illuminating said total internal reflection hologram with a scanning beam (17) and moving at least one of the hologram and photosensitive layer such that the magnitude of movement of the hologram relative to the photosensitive layer is equal to that of the scanning beam multiplied by the change of the scale required and also such that if the change of scale is a magnification the direction of the movement of the hologram relative to the photosensitive layer is the same as that of the scanning beam whereas if the change of scale is a compression then the direction of the movement of the hologram relative to the photosensitive layer is opposite to that of the scanning beam, and optionally comprising also introducing convergence or divergence into the scanning beam so that the image locally reconstructed from the TIR hologram possesses the change in the scale.
Abstract:
In the manufacture of an array total internal reflection hologram for printing a pattern of high-quality microfeatures over a large area, a mask (13) defining just a part of the pattern is used to record an array of sub-holograms, the holographic recording medium (10) or the mask being moved with respect to each other subsequent to the recordal of each sub-hologram, thereby building up a hologram of the complete pattern to be printed.
Abstract:
A method for forming alignment marks and a total internal reflection hologram in a holographic recording layer (14) for a lithographic process such that the alignment marks are readily detectable by an alignment system, including defining alignment marks (10) in a mask (11), said mask also defining the pattern (12) to be reconstructed from said TIR hologram, locating said holographic recording layer and said mask in a TIR hologram recording system, forming a TIR hologram of the mask pattern in the holographic recording layer and transferring the alignment marks in the mask into the holographic recording layer by illuminating the mask with an object beam (18); wherein the features of the alignment marks in the mask are of sufficient size that the alignment marks recorded in the holographic recording layer are well-defined regions of different refractive index and/or layer thickness.
Abstract:
In the manufacture of an array total internal reflection hologram for printing a pattern of high-quality microfeatures over a large area, a mask (13) defining just a part of the pattern is used to record an array of sub-holograms, the holographic recording medium (10) or the mask being moved with respect to each other subsequent to the recordal of each sub-hologram, thereby building up a hologram of the complete pattern to be printed.
Abstract:
A method for the manufacture of TIR holograms includes the division of an input laser beam into an object beam (15) and a reference beam (16), the direction of the beams to a holographic recording layer so that the object beam is incident on a surface of the holographic recording layer (8) following transmission through an object mask (11), so that the reference beam is incident on the other surface of the holographic recording layer at an angle such that following passage through the holographic recording layer it is totally internally reflected back into the holographic recording layer and so that the two beams are superposed at the holographic recording layer, and the displacement of the input laser beam causing the object and reference beams to traverse together the holographic recording layer. The method is especially useful for obtaining a high uniformity of exposure of the holographic recording layer.