摘要:
Holographic notch filters are provided that comprise photopolymer films, having an optical density of at least 2, mounted on a transparent substrate.
摘要:
Photopolymerizable compositions containing photoinitiator systems that absorb in the visible are disclosed. The photopolymerizable compositions contain at least one ethylenically unsaturated monomer capable of free radical initiated addition polymerization and a photoinitiator system capable of being activated by actinic radiation. The photoinitiator system comprises a hexaarylbisimidazole, a chain transfer agent, and a sensitizer given by the formulae A or B wherein X and R.sub.1 -R.sub.13 are as defined herein. ##STR1##
摘要:
Solid photopolymerizable compositions and photosensitive elements are provided that are useful in preparing optical elements, and especially holograms. The composition contains a polymeric binder, a liquid ethylenically unsaturated monomer, and a photoinitiator system. Typical compositions have a refractive index modulation of at least 0.005 when measured per the specified test.
摘要:
Photopolymerizable compositions which comprise a borate anion, a squarylium sensitizer, and, in the preferred case, a halomethyl triazine are disclosed.
摘要:
This invention relates to photopolymerizable compositions containing initiator systems that absorb in the longer wavelength region of the visible spectrum. Photopolymerizable compositions containing selected photodissociable initiators in combination with photobleachable sensitizers are disclosed.