Thomson C L, Dunn M H
J. F. Allen Research Laboratories, School of Physics & Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK.
Opt Express. 2013 Jul 29;21(15):17647-58. doi: 10.1364/OE.21.017647.
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.
在基于块状铌酸锂的腔内光学参量振荡器中已观察到级联差频产生，并产生太赫兹辐射的纳秒脉冲。产生了两个闲频波，即：与参量下转换过程本身相关的初级闲频波；以及由于差频产生的次级闲频波。报道了对产生的下转换波的频率、时间演化、传播方向、强度、相位匹配和振荡阈值的实验研究。太赫兹辐射的整体产生效率得到提高，从而克服了曼利-罗关系限制。确定了本方法相对于基于周期性极化铌酸锂的方案的优势。
