Under thermal loading, low stress assembly is one of the key factors to ensure the pointing stability of the splitting prism assembly in a multiband optical mechanical system. By analyzing the common bonding methods of prism assembly, the factors affecting the bonding stability include the transverse stress of multi-point bonding, the internal stress of the adhesive and the longitudinal stress perpendicular to the bonding surface. Then, the optimization methods are proposed, e.g., reducing the span of bonding surface, increasing the free end area of bonding and adding longitudinal constraints. The simulation results show that the variety of all surfaces of the prism is restrained under the temperature load of - 45 ℃ to 60 ℃, the change of surface shape is reduced from 0.381µm to 0.148µm at 60 ℃ and from 0.982µm to 0.553µm at - 45 ℃, which improves the pointing stability of the splitting prism. It’s indicated that this bonding technology can effectively improve the pointing stability of splitting prism and can be applied to the engineering design of the precision optical system.
A bi-axial centralized butterfly flexure hinge for a fast steering mirror (FSM) was presented to adapt highly stabile accuracy of beam-pointing control performance in space laser communication. According to the requirements of two-dimensional reciprocating movements and high bandwidth provided for the FSM, the solid model of the bi-axial centralized butterfly flexure hinge was designed. By applying Castigliano’s displacement theorem, the numerical model was simplified and deduced. Furthermore, to quantify the numerical model, natural frequencies of the finite-element analysis (FEA) and experiments were carried out the results of which were compared with the analytic solutions. The experimental results show that the in-plane natural frequencies are 66.37 and 112.2 Hz, respectively. The comparison shows that the errors between numerical analytic and experimentation are 3.0% and 1.4%, respectively, and errors between FEA and experimentation are 1.7% and 2.4%, respectively. It is proven that the bi-axial centralized butterfly flexure hinge we built is an appropriate structure as a two-axis guide mechanism in two-dimensions for an FSM system with a large bandwidth of 225 Hz.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.