![]() ![]() Optical and/or mechanical machining or probing of semiconductor wafers requires similar stability. Since visible light has sub-micron wavelengths, interferometry-based experiments (including holography) may also be impossible to perform in the presence of vibrations, even if they are sub-micron in amplitude. ![]() For example, many laser applications require a beam waist of a few microns if the position of this spot is critical to system performance (e.g., using an ion laser to pump a jet stream dye laser), then vibrations with amplitudes in the micron range will inevitably cause experimental failure. Many types of experiments are severely hampered, or even made impossible, by small vibrations. Optical systems comprised from multiple components that must be individually mounted and aligned in a precise and rigid fashion are particularly vulnerable to vibration-induced performance degradation. However, sources of vibration such as air conditioners, heat pumps, and road and rail transportation systems contribute to a largely unavoidable vibrational background noise that is coupled to the surrounding environment. In research and application laboratories, it is often necessary to conduct experiments or take measurements in a vibration-free environment. ![]()
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