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Rondo, the resonant harmonic converter, is the solution to cover spectral regions otherwise difficult to access via direct laser emission. It combines ultimate performances in a solid, simple-to-use and modular package.

Rondo can be employed in a variety of configurations to deliver the second, the third and the fourth harmonic of the fundamental laser.

Based on the Hänsch–Couillaud locking, Rondo doesn’t need phase modulation of the fundamental light, hence preserving the spectral purity.

Key features

  • Dual-stage PZT cavity locking
  • Automated cavity alignment via digital servo-controlled mirror mounts
  • Highly insensitive to acoustic noise and environmental perturbations
  • Free-space or fibre-coupled input
  • Modular and customizable design


  • Conversion efficiency up to 70%
  • Locking bandwidth > 50kHz
  • Spectral coverage from 205 to 1600nm
  • Wide wavelength tuneability
  • Converted power up to 20W
  • Mode-hop free tuning > 20GHz
  • Hands-off operation