Effect of Ionization Potential on Molecular Field-Free Alignment

2012 ◽  
Vol 571 ◽  
pp. 687-691
Author(s):  
Jia Jun Wu ◽  
Bang Lei Huang ◽  
Heng Hu ◽  
Peng Fei Wei
Keyword(s):  
Ionization Potential ◽  
Laser Intensity ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Polyatomic Molecules ◽  
Practical Application ◽  
High Order Harmonic Generation ◽  
Laser Parameters ◽  
High Order Harmonic ◽  
Rotational Wave

The alignment behaviors of polyatomic molecules under femtosecond laser pulses are experimentally and theoretically investigated. We observe the field-free alignment in C2H2 and CO2 molecules with High-Order Harmonic Generation (HHG) and discuss the evolution of the molecular rotational wave-packet with different laser parameters and ionization potentials. The results show that the molecular alignment degree depends not only on the laser parameters, but also on the molecular ionization potential. Finally we suggest the optimal aligning laser intensity to maximize the alignment degree for practical application.

Molecules in strong laser fields: vibrational inversion and harmonic generation

1994 ◽  
Vol 72 (3) ◽  
pp. 673-677 ◽  
Author(s):  
Eric E. Aubanel ◽  
André D. Bandrauk
Keyword(s):  
Harmonic Generation ◽  
Laser Pulses ◽  
Harmonic Spectrum ◽  
Femtosecond Laser Pulses ◽  
Generation Process ◽  
High Order Harmonic Generation ◽  
Vibrationally Excited ◽  
Potential Wells ◽  
High Order Harmonic ◽  
Vibrational Levels

We examine two consequences of the unique behaviour of molecules in strong fields. First, by time gating of laser-induced avoided crossings with femtosecond laser pulses, one can obtain efficient vibrational inversion into a narrow distribution of vibrational levels of a molecular ion. We demonstrate this by numerical solution of the time-dependent Schrödinger equation for [Formula: see text] Second, we show results of numerical calculation with vibrationally excited [Formula: see text] of harmonic generation up to the 11th order of an intense 1064- nm laser. We predict that competition of photodissociation can be minimized by trapping the molecule in high-field-induced potential wells, thus enhancing the high-order harmonic generation process. Furthermore, the harmonic spectrum can serve as a measure of the structure of these laser-induced potentials.

High-Order Harmonic Generation by Two Non-Collinear Femtosecond Laser Pulses in CO

2005 ◽  
Vol 22 (8) ◽  
pp. 1913-1915 ◽  
Author(s):  
Wang Run-Hai ◽  
Jiang Hong-Bing ◽  
Yang Hong ◽  
Wu Cheng-Yin ◽  
Gong Qi-Huang
Keyword(s):  
Femtosecond Laser ◽  
Harmonic Generation ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
High Order ◽  
High Order Harmonic Generation ◽  
High Order Harmonic

High-Order Harmonic Generation by Two Non-collinear Coherent Femtosecond Laser Pulses

2003 ◽  
Vol 20 (6) ◽  
pp. 848-851 ◽  
Author(s):  
Lu Wei-Xin ◽  
Liu Ting-Ting ◽  
Yang Hong ◽  
Sun Tao-Heng ◽  
Gong Qi-Huang
Keyword(s):  
Femtosecond Laser ◽  
Harmonic Generation ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
High Order ◽  
High Order Harmonic Generation ◽  
High Order Harmonic

HIGH-ORDER HARMONIC GENERATION WITH HIGH-INTENSITY FEMTOSECOND LASER PULSES

1995 ◽  
Vol 04 (03) ◽  
pp. 567-594 ◽  
Author(s):  
K. MIYAZAKI
Keyword(s):  
Harmonic Generation ◽  
Laser Pulses ◽  
Laser Wavelength ◽  
Femtosecond Laser Pulses ◽  
High Order ◽  
Rare Gas ◽  
High Order Harmonic Generation ◽  
Tunneling Ionization ◽  
High Order Harmonic ◽  
Interaction Processes

High-order harmonic generation experiments using intense, femtosecond dye (616 nm), XeCl (308 nm) and Ti:sapphire (782 nm) laser pulses are reviewed. Results obtained at focused intensities of 1013 ~ 1015 W/cm 2 have shown characteristic behaviors of the high-order harmonic and its distribution which depend on the laser wavelength, the laser intensity and the rare gas used as the nonlinear medium. Interaction processes for the efficient generation of high-order harmonics or short-wavelength coherent radiation in the multiphoton and tunneling ionization regimes are discussed based on the results obtained.

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