同成分铌酸锂(CLN)晶体是最常用的太赫兹参量增益晶体,基于该晶体的太赫兹波参量辐射源具有太赫兹波输出能量高、连续可调谐等优点,但是其调谐范围相对较窄,一般为0.6~3 THz,限制了其实际应用范围。为此,提出基于摩尔分数为5%的氧化镁掺杂的CLN晶体的脉冲种子注入式太赫兹波参量产生器,其太赫兹波频率调谐范围为1~4 THz,在2.0 THz处获得最大输出能量为1.02 μJ,输出太赫兹波的3 dB带宽达1.94 THz,占调谐范围的64.67%。该太赫兹辐射源具有宽频带、增益平坦等特性,在实际应用中具有更高的价值。

Congruent lithium niobate (CLN) is the most commonly used terahertz parametric gain crystal. The terahertz-wave parametric source based on the CLN crystal has the advantages of high terahertz-wave output energy and continuous tunability, but its tuning range is relatively narrow, generally during 0.6-3 THz, which limits its practical applications. Therefore, an injection pulse-seeded terahertz-wave parametric generator based on 5% mol MgO∶CLN crystal is proposed. The terahertz-wave frequency tuning range is 1-4 THz, and the maximum output energy is 1.02 μJ at 2.0 THz. The 3 dB bandwidth of the output terahertz wave is 1.94 THz, accounting for 64.67% of the tuning range. The terahertz radiation source has the characteristics of broadband and flat gain, and has higher value in practical applications.