Off-axis parabolic mirrors from Optical Surfaces Ltd. are the high precision optical component of choice for applications, including high power laser focusing, focusing upon astronomical objects, collimating reference wavefronts, beam expansion, MTF measurement, MRTD testing and bore sight alignment for missile guidance systems.
Optical Surfaces Ltd.'s highly experienced and skilled team of engineers and craftsmen can typically produce off-axis parabolic mirrors up to 600 mm in diameter with surface accuracies to lambda/20 p-v depending upon off-axis angles. With proprietary polishing techniques Optical Surfaces can achieve the natural limit to the off-axis angle of around 25-30 degrees and surface micro-roughness on aspherics of ~ 1 nm rms, depending on the surface accuracy required. A range of coatings is available for standard and custom components from metallic with or without protective overcoat to multilayer dielectrics and ultra hard coatings.
Parabolic mirrors are the most common type of aspherical mirrors used in optical instruments. They are free from spherical aberrations, and thus focus a parallel beam to a point or a point source to infinity. Off-axis parabolic mirrors provide an unobstructed aperture allowing complete access to the focal region as well as reducing the size and minimising the weight of a design. They are especially suitable for broadband or multiple wavelength applications due to their completely achromatic performance. All together these advantages produce a cost-effective solution for many optical design problems with no compromise in performance.