Effect of two-color laser pulse intensity ratio on intense terahertz generation

Lu, Chenhui; Zhang, Shian; Yao, Yunhua; Xu, Shuwu; Jia, Tianqing; Ding, Jun; Sun, Zhenrong

doi:10.1039/c4ra12556h

Cited by 8 publications

(3 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our simulation, the amplitude of the fundamental laser pulse E 0 is so set so that a moderate ionization degree W fi = 0.4 is produced at the standard five-color pulse, since the effects of the laser parameters will be different at higher laser intensities. [33,34] Once freed from the parent molecule, the electron will oscillate with the laser field, and the electron velocity at a subsequent time can be written as…”

Section: Theoretical Modelmentioning

confidence: 99%

Enhancement and modulation of terahertz radiation by multi-color laser pulses

Pei

Wang

et al. 2018

Chinese Phys. B

View full text Add to dashboard Cite

We study theoretically intense terahertz radiation from multi-color laser pulse with uncommon frequency ratios. Comparing the two-color laser scheme, of which the uncommon frequency ratio should be set to be a specific value, we show that by using multi-color harmonic laser pulses as the first pump component, the lasers as the second pump component can be adjusted in a continuous frequency range. Moreover, these multi-color laser pulses can effectively modulate and enhance the terahertz radiation, and the terahertz yield increases with the increase of the wavelength of the uncommon pump component and is stable to the laser relative phase. Finally, we utilize the electron densities and velocities of ionization events to illustrate the physical mechanism of the intense terahertz generation.

show abstract

Section: Theoretical Modelmentioning

confidence: 99%

Enhancement and modulation of terahertz radiation by multi-color laser pulses

Pei

Wang

et al. 2018

Chinese Phys. B

View full text Add to dashboard Cite

show abstract

“…In the scheme of interaction of intense laser field with gases, the commonly used driving field is a combination of a fundamental linearly polarized pulse and its second harmonic [14,15], for the linearly polarized THz generation. In order to enhance the THz radiation intensity, the duration of the pump pulse [16,17], phase delay [14,15,18,19] and intensity ratio between two pulses [20,21], should be carefully optimized. With these efforts, the THz pulse energy can be increased by at least one order of magnitude.…”

Section: Introductionmentioning

confidence: 99%

Strong polarization-controlled terahertz generation by bi-elliptical polarized laser fields

Liu

Zhang

et al. 2023

Front. Phys.

View full text Add to dashboard Cite

Terahertz generation from atoms driven by two color linearly polarized (LP) and circularly polarized (CP) laser fields have been well investigated. In this work, based on the photocurrent model, we investigate theoretically the intensity and polarization characteristics of terahertz waves radiated by the bi-elliptical polarized two-color laser fields with orthogonal or parallel major axes. We show that polarization-controlled, including circularly polarized terahertz waves with sufficient intensity comparable to that of co-rotating CP or parallel LP laser field, can be generated by using a longer-wavelength few-cycle bi-elliptical field. Our simulations also show that THz energy and ellipticity can be dramatically improved with dual-color elliptical field with tiny or large ellipticity, compared with that with two-color orthogonal LP field and counter-rotating CP laser field, respectively. Bi-elliptical polarized laser field provides a huge parameter space allowing for far-reaching control of THz emission.

show abstract

“…However, yield of emitted terahertz radiation depends on helicity of the laser pulses and it is maximum when the helicity is same [30]. Experimental studies based on two-colour laser pulses propagating in plasma have shown that higher the intensity ratio of the two laser pulses, lower will be the intensity of emitted terahertz radiation [31]. Also, the intensity of generated terahertz radiation depends on phase of the two-colour laser pulses.…”

mentioning

confidence: 99%

Terahertz to near infrared radiation generation using two-colour counter and co-polarized laser pulses propagating in homogeneous plasma

Mishra,

Singh,

Kumar

et al. 2023

Phys. Scr.

View full text Add to dashboard Cite

This study deals with the generation of terahertz (THz) to near infrared (NIR) radiation fields using two colour linearly polarized copropagating laser pulses having either counter or co-polarization state. The frequency difference between the two laser pulses is considered to be integral multiple of the plasma frequency. Perturbation technique and quasistatic approximation have been used to obtain radiation field equations. Analytical and two-dimensional particle in cell simulation studies of the proposed configuration show that the transverse and axial plasma electron velocities arising due to nonlinear coupling of the two pulses are responsible for generation of off-axis linearly polarized radiation fields which propagate through plasma into vacuum. The frequency of generated radiation is ~40 THz (~60 THz), when the frequency difference of the laser pulses is two (three) times the plasma frequency. Analytical results are validated using VSim particle in cell simulation code.

show abstract

Effect of two-color laser pulse intensity ratio on intense terahertz generation

Cited by 8 publications

References 42 publications

Enhancement and modulation of terahertz radiation by multi-color laser pulses

Enhancement and modulation of terahertz radiation by multi-color laser pulses

Strong polarization-controlled terahertz generation by bi-elliptical polarized laser fields

Terahertz to near infrared radiation generation using two-colour counter and co-polarized laser pulses propagating in homogeneous plasma

Contact Info

Product

Resources

About