Dynamic behaviour of two CO2 lasers, phase-locked through diffraction coupling

W. Weingartner; Kurt Schroeder; Dieter Schuoecker

doi:10.1117/12.270258

4 April 1997 Dynamic behaviour of two CO₂ lasers phase-locked through diffraction coupling

W. Weingartner, Kurt Schroeder, Dieter Schuoecker

Proceedings Volume 3092, XI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference; (1997) https://doi.org/10.1117/12.270258
Event: XI International Symposium on Gas Flow and Chemical Lasers and High Power Laser Conference, 1996, Edinburgh, United Kingdom

Abstract

A method of phase locking two carbon-dioxide lasers through diffraction coupling is presented, which is achieved by the parallel propagation of the two laser beams along a common so- called coupling path. This is done by folding the resonator twice by mirrors and extraction of the output radiation by a common output coupler. As this method is only utilizing reflective optics (except of the output coupler), it is also practicable as a technique for phase-locking lasers with powers in the multi-kW range. Diffraction leads to an overlap of the optical fields of the two lasers, establishing a phase- locked state, if several locking conditions are fulfilled. The amount of energy, diffracted from one resonator to the second cavity which is necessary to establish phase-locking, depends highly on the length detuning between the two resonators. Phase-locked operation is detected by measuring the beat signal between the two laser beams. Since the coupling between the lasers is small, a stable phase-locked operation can only be obtained, if the length of one resonator arm is actively controlled with a PC-based electronic stabilization loop, driving a piezoelectric translator for resonator length tuning.

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W. Weingartner, Kurt Schroeder, and Dieter Schuoecker "Dynamic behaviour of two CO₂ lasers phase-locked through diffraction coupling", Proc. SPIE 3092, XI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, (4 April 1997); https://doi.org/10.1117/12.270258

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KEYWORDS

Resonators

Mode locking

Mirrors

Diffraction

Carbon dioxide lasers

Laser resonators

Output couplers

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