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首页> 外文期刊>Optics Letters >Effect of extreme pump pulse reshaping on intense terahertz emission in lithium niobate at multimilliJoule pump energies
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Effect of extreme pump pulse reshaping on intense terahertz emission in lithium niobate at multimilliJoule pump energies

机译:毫微焦耳能量下极端泵浦脉冲整形对铌酸锂中太赫兹强烈发射的影响

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摘要

We report on terahertz (THz) generation via optical rectification in a room-temperature lithium niobate crystal under variable pump pulse durations, ranging from 100 to 300 fs, at 800 nm center wavelength. The efficiency for the process is predicted to have an order of magnitude increase when longer duration Fourier-limited pump pulses are used. Our results confirm this increase in efficiency, and we report a record 800 nm pump energy conversion efficiency of 0.35% with a saturation at >240 fs pulse duration. While promising, our findings show a series of key problems that must be overcome before the theoretical limit can be achieved, including the influence of the pump bandwidth broadening due to the cascaded nonlinearity taking place within the crystal.
机译:我们报告了在室温下铌酸锂晶体中,在中心波长为800 nm的可变泵浦脉冲持续时间范围为100至300 fs的情况下,通过光整流产生太赫兹(THz)的过程。当使用更长持续时间的傅里叶极限泵脉冲时,预计该过程的效率将增加一个数量级。我们的结果证实了效率的提高,我们报告了创纪录的0.35%的800 nm泵浦能量转换效率,脉冲持续时间> 240 fs。尽管很有希望,但我们的发现表明,在达到理论极限之前,必须解决一系列关键问题,包括由于晶体内发生级联的非线性而导致的泵浦带宽扩展的影响。

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