Design of a Triangular Active Ring Laser 13 m on a Side.

Area of Science:

• Physics
• Optical Engineering
• Laser Interferometry

Background:

• Large ring laser interferometers are crucial for precision measurements.
• Helium-neon (He-Ne) lasers present unique challenges in large-scale applications.
• Understanding issues like lock-in and mode hopping is vital for interferometer stability.

Purpose of the Study:

• To design and test a proof-of-principle triangular active ring laser interferometer.
• To investigate phenomena affecting large He-Ne ring lasers, including lock-in, multimode interference, and mode hopping.
• To explore the interferometer's response to Earth's rotation and environmental perturbations.

Main Methods:

• Construction of a ~13 m triangular active ring laser interferometer.
• Examination of He-Ne laser characteristics, including neon isotope mixtures.
• Analysis of the interferometer's sensitivity to tilt, area changes, and rotational effects.

Main Results:

• Successful design and testing of the proof-of-principle interferometer.
• Identification and analysis of key issues like lock-in and mode hopping in large He-Ne lasers.
• Demonstration of the ring laser's response to Earth's rotation and perturbations.

Conclusions:

• The developed interferometer serves as a viable proof-of-principle for large-scale applications.
• Understanding laser dynamics is critical for the performance of large interferometers.
• Potential applications for large interferometers in sensing and metrology are identified.