Continuous mode-locked operation of a singly resonant, synchronously pumped optical parametric oscillator (SPOPO) based on CdSe has produced idler output tuned over the range of 9.1–9.7 μm , the longest wavelength generated so far to our knowledge from a SPOPO. Average idler powers as high as ~70 mW are generated in the crystal. Tandem pumping with a diffraction-grating-tuned parametric oscillator in periodically poled lithium niobate provides a convenient and agile means of tuning the noncritically phase-matched CdSe device. The absence of any detrimental thermal effects in the CdSe crystal suggests that significant further power scaling should be possible, with idler tuning ranges extendable to cover 8–12μm .
© 2003 Optical Society of America
M. A. Watson, M. V. O’Connor, D. P. Shepherd, and D. C. Hanna, "Synchronously pumped CdSe optical parametric oscillator in the 9–10 μm region," Opt. Lett. 28, 1957-1959 (2003)