Misalignment sensitivity in an intra-cavity coherently combined crossed-Porro resonator configuration

Z. Alperovich, O. Buchinsky, S. Greenstein, A. A. Ishaaya

Research output: Contribution to journalArticlepeer-review

Abstract

We investigate the misalignment sensitivity in a crossed-Porro resonator configuration when coherently combining two pulsed multimode Nd:YAG laser channels. To the best of our knowledge, this is the first reported study of this configuration. The configuration is based on a passive intra-cavity interferometric combiner that promotes self-phase locking and coherent combining. Detailed misalignment sensitivity measurements are presented, examining both translation and angular deviations of the end prisms and combiner, and are compared to the results for standard flat end-mirror configurations. The results show that the most sensitive parameter in the crossed-Porro resonator configuration is the angular tuning of the intra-cavity interferometric combiner, which is ∼±54 μrad. In comparison, with the flat end mirror configuration, the most sensitive parameter in the resonator is the angular tuning of the output coupler, which is ∼±11 μrad. Thus, with the crossed-Porro configuration, we obtain significantly reduced sensitivity. This ability to reduce the misalignment sensitivity in coherently combined solid-state configurations may be beneficial in paving their way into practical use in a variety of demanding applications.

Original languageEnglish
Article number085802
JournalLaser Physics Letters
Volume14
Issue number8
DOIs
StatePublished - 1 Aug 2017

Keywords

  • Porro-prism resonators
  • coherent combining
  • laser resonators
  • resonator misalignment sensitivity

ASJC Scopus subject areas

  • Instrumentation
  • Physics and Astronomy (miscellaneous)

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