Abstract
Pulsed intra-cavity OPO-DFG (OPO-iDFG) using two periodically poled lithium niobate (PPLN) crystals and cascaded mid-infrared generation was demonstrated using AgGaSe2,. The OPO-PPLN crystal operated in the usual manner by converting pump photons (ωp) into signal (ωs) and idler (ωi) photons (ωp = ωs + ωi). The DFG-PPLN crystal was designed to phase match the signal and idler waves to produce a difference frequency photon (ωd = ωs − ωi = 2ωs − ωp) and an additional idler photon. Since the signal photon is generated in the OPO, but consumed in the nonlinear DFG process, back conversion is minimized and pump depletion is improved.1,2 The output of the OPO-iDFG (ωi and ωd) is used to generate inter-cavity DFG radiation (ωD = ωd − ωi) using an AgGaSe2 crystal. By changing the temperature of the PPLN crystals, the wavelength of the OPO-iDFG radiation (ωi and ωd) changes, and consequently changes the wavelength of the inter-cavity DFG radiation (ωD). The experimental setup and energy diagrams of each process are shown in Fig. 1.
© 2002 Optical Society of America
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