| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Terahertz Emission Dependence on the Fundamental Optical Intensity in Generating Terahertz Waves from Two-Color Laser-Induced Gas Plasma |
| DAI Hou-Mei1,2, LIU Jin-Song1**
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1Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074
2Hubei Provincial Key Laboratory of Systems Science in Metallurgical Process, Wuhan University of Science and Technology, Wuhan 430081
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| Cite this article: |
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DAI Hou-Mei, LIU Jin-Song 2011 Chin. Phys. Lett. 28 104201 |
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Abstract A transient photocurrent model is used to explain terahertz emission from gas plasma irritated by two-color laser pulses, with one the second harmonic of the other. Taking multiple degrees of ionization into account, the gas ionization process at different laser intensities from 1014 W/cm2 to 1015 W/cm2 is discussed. The results show that when Iω≥6×1014 W/cm2, double ionization plays an important role in producing electrons. The corresponding terahertz spectra and waveforms are calculated, showing that increasing laser intensity can broaden the spectra to high frequencies and enhance the terahertz field.
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| Keywords:
42.65.Re
95.85.Gn
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Received: 24 February 2011
Published: 28 September 2011
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| PACS: |
42.65.Re
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(Ultrafast processes; optical pulse generation and pulse compression)
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95.85.Gn
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(Far infrared (10-300 μm))
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