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Physics Letters A

Coherent control of ionization in two-color laser fields: a comparison between ω–2ω and ω–3ω combinations

Shangqing Gong, Haitao Wu, Zhongyang Wang, Zhizhan Xu

Published Jul 1, 2000• 5 citations
Publisher
DOI
10.1016/s0375-9601(00)00276-0

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The coherent control of ionization using two-color field has received considerable attention in recent years. In the case of two color laser field, because of additional degrees of freedom such as relative phase, intensities and relative polarizations, etc., the ionization of the system can be influenced significantly. In most papers, they investigated the ionisation behavior of system by using the combinations of the fundamental laser field (/spl omega/) and its second (2/spl omega/) or third (3/spl omega/) harmonic field. To our knowledge, a comparison between /spl omega/-2/spl omega/ and /spl omega/-3/spl omega/ is seldom dealt with. In this paper, we choose the combination of the fundamental laser field (/spl omega/) with its second (2/spl omega/) or third (3/spl omega/) harmonic field, and investigate the ionization of the system for the two kinds of combinations.

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A coupled equations approach based on a general artificial channel method is used to demonstrate two color laser coherent control of photopredissociation and photoionization in Cl2. Photopredissociation of the 1Πg states of Cl2 is suppressed by a two plus four photon interference process 2ω2=4ω4, whereas the photoionization is controlled by interference between a six photon transition and a four photon transition 6ω4=2ω2+2ω4 using the same 1Πg photopredissociation resonances as intermediates. Photopredissociation angular distributions illustrate the suppression of the corresponding transition in selective rotational states.

The Journal of Chemical Physics•Jan 1, 1994•16 citations
The coherent control of ionization using two-color field has received considerable attention in recent years. In the case of two color laser field, because of additional degrees of freedom such as relative phase, intensities and relative polarizations, etc., the ionization of the system can be influenced significantly. In most papers, they investigated the ionisation behavior of system by using the combinations of the fundamental laser field (/spl omega/) and its second (2/spl omega/) or third (3/spl omega/) harmonic field. To our knowledge, a comparison between /spl omega/-2/spl omega/ and /spl omega/-3/spl omega/ is seldom dealt with. In this paper, we choose the combination of the fundamental laser field (/spl omega/) with its second (2/spl omega/) or third (3/spl omega/) harmonic field, and investigate the ionization of the system for the two kinds of combinations.
Using the full Maxwell-Bloch equations which avoid the limitations of slowly-varying-envelope approximation and the rotating--wave approximation as ultrashort pulses are considered, we investigate the coherent control of spectra effects with two color few-cycle laser pulses. We demonstrate that the interference effect of the two laser pulses can substantially modify the behavior of the spectra, higher spectral components can occur even for small area pulses. Moreover, comparing the ω-2ω combination with the ω-3ω scenario, we find due to the deferent superposition of the two kinds of combined laser pulses, the features of these higher spectral components can be much different.
A coupled equations approach based on a general artificial channel method is used to demonstrate two color laser coherent control of photopredissociation and photoionization in Cl2. Photopredissociation of the 1Πg states of Cl2 is suppressed by a two plus four photon interference process 2ω2=4ω4, whereas the photoionization is controlled by interference between a six photon transition and a four photon transition 6ω4=2ω2+2ω4 using the same 1Πg photopredissociation resonances as intermediates. Photopredissociation angular distributions illustrate the suppression of the corresponding transition in selective rotational states.