Terahertz generation based on four-wave mixing difference frequency by resonance-enhanced third-order nonlinear of media

• 来源期刊: 光电子快报（英文版）
• 年，卷（期）: 2011,（6）
• 页码范围: 415-418
• 页数: 4页
• 语种: 英文
• DOI: 10.1007/s11801-311-1099-3

摘要

Using nanosecond pulse near-infrared and mid-infrared laser pulses as the pump source,we obtain terahertz wave sources via four-wave difference frequency mixing.From the coupled wave theory,.we analyze the four-wave mixing process of GaSe crystal and alkali metal vapor in detail,get the analytical expression of terahertz wave output power,and discuss the conditions for achieving phase matching.By adjusting the pump frequency,the third-order nonlinear polarization of alkali metal vapor is resonance-enhanced.This program offers a new type of high-power terahertz radiation source.