Construction
In ring lasers, mirrors are used to focus and redirect the laser beams at the corners. While traveling between mirrors, the beams pass through gas-filled tubes. The beams are generally generated through local excitation of the gas by radio frequencies.
Critical variables in the construction of a ring laser include:
1. Size: Larger ring lasers can measure lower frequencies. The sensitivity of large rings increases quadratically with size.
2. Mirrors: High reflectivity is important.
3. Stability: The assembly must be attached to or built within a substance that changes minimally in response to temperature fluctuations (e.g. Zerodur, or bedrock for extremely large rings).
4. Gas: HeNe generates beams with the most desirable features for large ring lasers. For gyros, in principle any material that can be used to generate monochromatic light beams is applicable.
Read more about this topic: Ring Laser
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