External Cavity Frequency Doubler for CW Lasers
The WaveTrain is a powerful tool for eﬃcient and stable second harmonic generation of single-frequency continuous wave lasers like the Matisse. It is based on a low-loss, ultra compact enhancement cavity using a patented triangle-shaped ring resonator. A temperature stabilized nonlinear crystal generates the second harmonic of the enhanced fundamental radiation with very high eﬃciency of up to more than 35%. A Pound-Drever-Hall locking scheme in combination with an auto-relock stabilizes the length of the resonator cavity for ultra stable second harmonic generation and widest automated tunability. The phase-matching angle of the nonlinear crystal is manually tunable over more than 50 nm.
The WaveTrain provides highest fexibility for various single-frequency laser. Two pre-mounted optics sets for quick and easy exchange cover the visible to the near infrared wavelength region. Various wavelength are accessible by exchange of pre-mounted crystal or by phase-matching angle tuning. The WaveTrain provides space for integrating various mode-matching optics within its housing. The sealed resonator block prevents contamination of the optics and allows easy flushing of the cavity with purifed air or nitrogen. The Closed Loop Purge Unit (CLPU) can be used as an option to purify the air inside the WaveTrain over years of operation.
CW Single-Frequency Second Harmonic Generation
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2) crystal cut wavelength may vary by 1%