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We report on what is to our knowledge the first realization of a quasi-phase-matched optical parametric oscillator (OPO) based on a crystal with a cylindrical shape. The main reason for interest in this device is its broad, continuous tuning. In experiments with a 1064-nm pump, the signal tuning range was equal to 525 nm (1515-2040 nm), and the corresponding idler was continuously tuned over 1340 nm (2220-3560 nm). The angular tuning was 26 degrees , with only a minor variation of the OPO threshold over the entire tuning range.

We have synthesised, by the flux-growth method, millimetric crystals of new compounds isotype of KTiOP04 which also have non-linear optical properties: cesium titanyl arsenate CsTiOAsO, and the complete or incomplete solid solutions of general formula Cs,M,-,TiOAs,P1-y04 with M 3 K or Rb. The second harmonic generation test (SHG: 1.064 ,um/0.532 ym) is positive for all these compounds. The ferroelectric transition temperatures are determined by measuring the temperatures at which the SHG disappears. The melting points of the compounds are also determined.