Observation of a cascaded process in intracavity terahertz optical parametric oscillators based on lithium niobate
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Cascaded difference frequency generation has been observed in intracavity optical parametric oscillators based on bulk lithium niobate and producing nanosecond pulses of terahertz radiation. Two idler waves are generated, namely: the primary idler wave associated with the parametric down conversion process itself; and a secondary idler wave, due to difference frequency generation. Experimental investigations of the frequency, temporal evolution, propagation direction, intensity, phase matching and oscillation threshold of the generated down-converted waves are reported. The overall generation efficiency for the terahertz radiation is enhanced, thereby overcoming the Manley-Rowe limit. Advantages of the present approach over schemes based on periodically poled lithium niobate are identified.
Thomson , C L & Dunn , M H 2013 , ' Observation of a cascaded process in intracavity terahertz optical parametric oscillators based on lithium niobate ' Optics Express , vol 21 , no. 15 , pp. 17647-17658 . DOI: 10.1364/OE.21.017647
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