Approach dealing with the temporal profile of a probe laser pulse in the open-aperture Z-scan

2013 ◽  
Vol 52 (5) ◽  
pp. 1076 ◽  
Author(s):  
Yong Zhang ◽  
Shuyun Wang ◽  
Qing Yu ◽  
Dayun Wang ◽  
Ming Liu ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Open Aperture ◽  
Probe Laser ◽  
Temporal Profile

Laser Pulse Temporal Profile Distortions in Multi-pass Amplifiers

2014 ◽  
Author(s):  
Olga Vadimova ◽  
Ivan Mukhin ◽  
Oleg Palashov
Keyword(s):  
Laser Pulse ◽  
Temporal Profile

scholarly journals A velocity-map imaging study of methyl non-resonant multiphoton ionization from the photodissociation of CH 3 I in the A-band

2017 ◽  
Vol 375 (2092) ◽  
pp. 20160205 ◽  
Author(s):  
Sonia Marggi Poullain ◽  
David V. Chicharro ◽  
Luis Rubio-Lago ◽  
Alberto García-Vela ◽  
Luis Bañares
Keyword(s):  
Laser Pulse ◽  
Gas Phase ◽  
Potential Energy Surfaces ◽  
Quantum Dynamics ◽  
Multiphoton Ionization ◽  
Imaging Study ◽  
Probe Laser ◽  
Excitation Wavelength ◽  
Velocity Map Imaging ◽  
Efficient Detection

Chemical reaction dynamics and, particularly, photodissociation in the gas phase are generally studied using pump–probe schemes where a first laser pulse induces the process under study and a second one detects the produced fragments. Providing an efficient detection of ro-vibrationally state-selected photofragments, the resonance enhanced multiphoton ionization (REMPI) technique is, without question, the most popular approach used for the probe step, while non-resonant multiphoton ionization (NRMPI) detection of the products is scarce. The main goal of this work is to test the sensitivity of the NRMPI technique to fragment vibrational distributions arising from molecular photodissociation processes. We revisit the well-known process of methyl iodide photodissociation in the A-band at around 280 nm, using the velocity-map imaging technique in conjunction with NRMPI of the methyl fragment. The detection wavelength, carefully selected to avoid any REMPI transition, was scanned between 325 and 335 nm seeking correlations between the different observables—the product vibrational, translational and angular distributions—and the excitation wavelength of the probe laser pulse. The experimental results have been discussed on the base of quantum dynamics calculations of photofragment vibrational populations carried out on available ab initio potential-energy surfaces using a four-dimensional model. This article is part of the themed issue ‘Theoretical and computational studies of non-equilibrium and non-statistical dynamics in the gas phase, in the condensed phase and at interfaces’.

A Study on Thin Film Microstructure and Its Effects on Acoustic Film Velocity Through Picosecond Ultrasonics Technique

2004 ◽  
Vol 833 ◽  
Author(s):  
Ta-Ching Li ◽  
Nen-Wen Pu ◽  
Ben-Je Lwo ◽  
Chin-Hsing Kao ◽  
Long-Jang Hu
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Laser Pulse ◽  
Strong Dependence ◽  
Growth Conditions ◽  
Ultrasonic Waves ◽  
Probe Laser ◽  
Acoustic Resonators ◽  
Partial Pressures ◽  
Film Bulk

ABSTRACTIn acoustic devices such as film bulk acoustic resonators (FBAR), it is most essential to accurately determine the thin-film sound velocities in situ. In this work, we analyzed the microstructure properties of the zirconia thin films deposited by RF magnetron reactive sputtering with various oxygen partial pressures, and measured the longitudinal film velocity with picosecond ultrasonic technique. The picosecond ultrasonic waves were produced by irradiating the testing samples with an ultrafast laser pulse generated by a self-made mode-locked Ti: Sapphire laser, and detected by a delayed probe laser pulse. The acoustic velocities of the thin films were next determined from the echo times of the ultrasonic waves. To derive more accurate and reliable velocity, three different reflective layers were employed so that the echo shapes and intensities of ultrasonic wave can be compared. It was found in this work that the thin film velocities we measured were less than the bulk value, which can be calculated from Young's modulus and the density. Meanwhile, with the measurement results, it is also found that the measured acoustic velocity and the microstructure of films have strong dependence on the growth conditions. Consequently, accurate thin film velocity will be obtained for an SMR designer through better controlling on deposition conditions during manufacturing process.

scholarly journals Three-dimensional Maxwell-Bloch calculation of the temporal profile of a seeded soft x-ray laser pulse

2012 ◽  
Vol 101 (25) ◽  
pp. 251112 ◽  
Author(s):  
F. Tissandier ◽  
S. Sebban ◽  
J. Gautier ◽  
Ph. Zeitoun ◽  
E. Oliva ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Three Dimensional ◽  
X Ray ◽  
Temporal Profile

Recording of the Temporal Profile of the Laser Pulse Front at the Luch Facility with a Large Dynamic Range and Picosecond Resolution

2019 ◽  
Vol 27 (3) ◽  
pp. 229-232 ◽  
Author(s):  
I. A. Belov ◽  
A. Yu. Voronin ◽  
L. A. Dushina ◽  
D. S. Kornienko ◽  
A. G. Kravchenko ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Dynamic Range ◽  
Large Dynamic Range ◽  
Pulse Front ◽  
Temporal Profile
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