Characterization of optical components for use in harsh environments - art. no. 628702

The characterization of mounted and/or bonded optical assemblies for survivability in harsh environments is crucial for the development of robust laser-optical firing systems. Customized mounts, bonded assemblies and packaging strategies were utilized for each of the laser resonator optics with the goal of developing and fielding a reliable initiation system for use in extreme conditions. Specific components were selected for initial testing based on past experience, material properties and optical construction. Shock, vibration and temperature testing was performed on three mounted optical components, polarizing cube beam splitters, Q-switch assemblies and xenon flashlamps. Previously, flashlamps of a solder-sealed construction type were successfully tested and characterized. This test regiment characterized the more fragile glass-to-metal seal constructed flashlamps. Components were shock-tested to a maximum impulse level of 5 700 G's with a 1.1 millisecond long pulse. Vibration tests were performed to a maximum level of 15.5 grms for forty seconds in each of three axes. During each test, components were functionally tested and visually inspected at a specified point to verify survival. Temperature tests were performed over a range extending from a maximum of 75 degrees C to a minimum of -55 degrees C, allowing for a two hour soak at each temperature set point. Experimental results obtained from these tests will be discussed as will their impact on future component mounting strategies.