Holograms created from cylindrical hologram masters

A method of producing hologram from at least a portion of an original cylindrical hologram comprising the steps of:

• illuminating said at least a portion of the original cylindrical hologram with a coherent illumination wave which comes to focus as a line located substantially on the virtural axis of the cylinder, said illumination wave being formed by a method comprising the steps of:
• placing a cylinder with an inner reflective surface in a position such that its axis is coincident with that of said original cylindrical hologram, said reflective cylinder having a diameter which is greater than that of the original cylindrical hologram, and
• directing a beam of coherent illumination onto said reflective surface, and at such an angle with respect to said reflective surface that the reflected rays pass through the original cylindrical hologram,
• directing a beam of coherent illumination through a region of the axis of the aforementioned cylindrical reflector, and
• placing essentially on said cylinder axis a transmissive or reflective rod whose axis is coincident with the cylinder axis and from which is reflected or refracted a substantial portion of said coherent illumination beam and which further causes the reflected or refracted beam to fall upon a substantial portion of the aforementioned cylindrical reflector, thereby creating a beam which comes to focus substantially as a line on the cylinder axis, and
• placing within the cylinder an image-receiving surface to intercept the real image rays diffracted from said original hologram,
• directing onto said image-receiving surface, at a finite angle with respect to the image rays, a reference wave which is coherent with the illumination beam of the original hologram, thereby producing a pattern of interference fringes on the image-receiving surface, and
• detecting and recording as a second hologram said interference fringes.

A method of producing a second hologram from at least a portion of an original cylindrical hologram comprising the steps of:

• illuminating said at least a portion of the original cylindrical hologram with a coherent illumination wave which comes to focus as a line located substantially on the virtural axis of the cylinder, said illumination wave being formed by a method comprising the steps of:
• placing a cylinder with an inner reflective surface in a position such that its axis is coincident with that of said original cylindrical hologram, said reflective cylinder having a diameter which is greater than that of the original cylindrical hologram,
• directing a beam of coherent illumination onto said reflective surface, and at such an angle with respect to said reflective surface that the reflected rays pass through the original cylindrical hologram,
• directing a beam of coherent illumination along said aforementioned cylinder axis, and
• placing on said cylinder axis a reflective or transmissive cone whose axis is coincident with the cylinder axis and from which is reflected or refracted a substantial portion of said coherent illumination beam, and which further causes the reflected or refracted beam to fall upon a substantial portion of the aforementioned cylindrical reflector, thereby creating a beam which comes to focus substantially as a line on the cylinder axis, and
• placing within the cylinder an image-receiving surface to intercept the real image rays diffracted from said original hologram,
• directing onto said image-receiving surface, at a finite angle with respect to the image rays, a reference wave which is coherent with the illumination beam of the original hologram, thereby producing a pattern of interference fringes on the image-receiving surface, and
• detecting and recording as a second hologram said interference fringes.

A method of producing a second hologram from at least a portion of an original cylindrical hologram comprising the steps of:

• illuminating said at least a portion of the original cylindrical hologram with a coherent illumination wave which comes to focus as a line located substantially on the virtual axis of the cylinder,
• placing within the cylinder an image-receiving surface to intercept the real image rays diffracted from said original hologram, said image-receiving surface being substantially cylindrical and concentric with the original hologram,
• directing onto said image-receiving surface, at a finite angle with respect to the image rays, a reference wave which is coherent with the illumination beam of the original hologram, thereby producing a pattern of interference fringes on the image-receiving surface, and
• detecting and recording as a second hologram said interference fringes.

A method of producing a second hologram from at least a portion of an original cylindrical hologram comprising the steps of:

• illuminating said at least a portion of the original cylindrical hologram with a coherent illumination wave which comes to focus as a line located substantially on the virtual axis of the cylinder,
• placing within the cylinder an image-receiving surface to intercept the real image rays diffracted from said original hologram,
• directing onto said image-receiving surface, at a finite angle with respect to the image rays, a reference wave which is coherent with the illumination beam of the original hologram, thereby producing a pattern of interference fringes on the image-receiving surface, the reference wave being created by a method comprising the steps of:
• placing a cylinder with an inner reflective surface in a position such that its axis is coincident with or close to coincidence with the original cylindrical hologram axis, and
• directing a coherent reference beam onto the inner surface of said reflective cylinder, and at an angle such that the reflected rays pass through said aforementioned image-receiving surface and come to focus as a line which is parallel to the axis of the original cylindrical hologram, and
• detecting and recording as a second hologram said interference fringes.

A method of producing a second hologram from at least a portion of an original cylindrical hologram comprising the steps of:

• illuminating said at least a portion of the original cylindrical hologram with a coherent illumination wave which comes to focus as a line located substantially on the virtual axis of the cylinder,
• placing within the cylinder an image-receiving surface to intercept the real image rays diffracted from said original hologram,
• directing onto said image-receiving surface, at a finite angle with respect to the image rays, a reference beam which is coherent with the illumination beam of the original hologram, thereby producing a pattern of interference fringes on the image-receiving surface, the reference beam being created by directing a beam of coherent illumination onto a reflective surface, said reflective surface being of such a shape that the reflected rays come to focus as a point located substantially on the axis of the original cylindrical hologram after passing through said aforementioned image-receiving surface, and
• detecting and recording as a second hologram said interference fringes.

A method of producing a second hologram from at least a portion of an original cylindrical hologram comprising the steps of:

• illuminating said at least a portion of the original cylindrical hologram with a coherent illumination wave which comes to focus as a point located substantially on a virtual axis of the cylinder,
• placing within the cylinder an image-receiving surface to intercept real image rays diffracted from said original hologram,
• directing onto said image-receiving surface at a finite angle with respect to the real image rays, a reference wave which is coherent with the illumination beam of the original hologram thereby producing a pattern of interference fringes on the image-receiving surface, and
• detecting and recording as a second hologram the said interference fringes.

A method of producing a second hologram from at least a portion of an original cylindrical hologram comprising the steps of:

• illuminating said at least a portion of the original cylindrical hologram with a coherent illumination wave which comes to focus as a line located substantially on the virtural axis of the cylinder,
• placing within the cylinder an image-receiving surface to intercept the real image rays diffracted from said original hologram, wherein the dimension of the original cylindrical hologram in the direction of said axis is significantly less than the same dimension of said image-receiving surface, thereby to produce the recorded second hologram with a significantly greater height than that of the original cylindrical hologram,
• directing onto said image-receiving surface at a finite angle with respect to the image rays, a reference wave which is coherent with the illumination a beam of the original hologram, thereby producing a pattern of interference fringes on the image-receiving surface, and
• detecting and recording as a second hologram said interference fringes.