PRODUCTION OF UNIAXIALLY BONDED CRYSTAL OBTAINED BY CHEMICALLY BONDING AND INTEGRATING SYNTHETIC SINGLE CRYSTALS HAVING SAME MAIN COMPONENT AND CRYSTAL FORM

摘要

PURPOSE:To easily form a single crystal having prescribed shape by machining each synthetic single crystal in a state to have the same axis, axial ratio and axial angle at the corresponding faces, optically polishing the crystals, closely contacting the polished faces with each other and uniformly heating the whole assembly. CONSTITUTION:Each of anisotropic synthetic single crystals (e.g. a prism 1 and a prism 2) having the same main component and same crystal system are machined in a state to have the same axis (axis a, b and c), same axial ratio and same axial angle (alpha, beta and gamma), the surfaces are optically polished, the polished faces are closely contacted with each other and the whole assembly is uniformly heated to form a chemical bond and obtain an integrated uniaxially bonded crystal (e.g. parallelly bonded prism 5). The heating is carried out either by heating to a prescribed temperature and keeping at the temperature to complete the heat-treatment or by repeating the heating and slow-cooling while keeping the maximum temperature to be lower than the transition point of the synthetic single crystal and repeating the heating process while setting the maximum temperature to exceed the above transition point until the temperature reaches the above prescribed temperature.