High-order harmonics generation by few-cycle and multi-cycle femtosecond laser pulses

doi:10.1088/1674-1056/19/12/124210

Abstract This paper investigates experimentally high-order harmonic generation (HHG) of neon gas with 5-fs and 25-fs driving laser pulses. It has been demonstrated that the cutoff energy of the harmonic extreme ultraviolet photons is extended to 131 eV and the HHG spectrum near the cutoff region becomes continuum as the driving laser pulse duration is 5 fs; whereas much lower cutoff photon energy and discrete harmonic spectrum near the cutoff region are presented as the laser pulse duration is 25 fs. The results can be explained by the fact that neutral atoms can be exposed to more intense laser field before they are depleted by ionization because of the extremely short rising time of the few-cycle pulse. The 5-fs driving laser pulse paves the way of generation of coherent x-ray in the water window and single attosecond pulse.

Keywords: high harmonics generation short pulse super-continuum spectrum

Received: 25 March 2010
Revised: 19 May 2010
Accepted manuscript online:

PACS:	42.65.Ky	(Frequency conversion; harmonic generation, including higher-order harmonic generation)
	42.65.Re	(Ultrafast processes; optical pulse generation and pulse compression)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 60608003, 10874237 and 60808007), and the National Basic Research Program of China (973 Program) (Grant No. 2007CB815104).

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Yun Chen-Xia(运晨霞), Teng Hao(滕浩), Zhang Wei(张伟), Zhan Min-Jie(詹敏杰), Han Hai-Nian(韩海年), Zhong Xin(钟欣), Wei Zhi-Yi(魏志义), Wang Bing-Bing(王兵兵), and Hou Xun(侯洵) High-order harmonics generation by few-cycle and multi-cycle femtosecond laser pulses 2010 Chin. Phys. B 19 124210

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High-order harmonics generation by few-cycle and multi-cycle femtosecond laser pulses

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