Investigation of the Long Term Frequency Stability of Stable Laser Structures.
MARYLAND UNIV COLLEGE PARK DEPT OF ELECTRICAL ENGINEERING
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6328A He-Ne laser structures, made from ultra low expansion materials, suspended in temperature and pressure controlled chambers, have shown drift rates in excess of 5 MHz per day. The same structure, evacuated and used as passive Fabry Perot resonators, suspended in the previous now evacuated chambers, still show a drift rate of the order of 2 MHz per day. Computer simulated mirror model ageing shows that relatively large changes of the dielectric constants of the mirror coatings are needed to explain the measured drift. The authors propose that the dimensional stability of the materials, the properties of the optical contacts used as well as the behavior of the dielectric mirrors should be more carefully investigated. Modified author abstract
- Lasers and Masers