DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Laser pulse-length dependent ablation and shock generation in silicon at 5 × 10 14 W/ cm 2 intensities

Journal Article · · Physical Review Research

The effect of laser pulse duration on energy coupling into a planar silicon target is investigated in experiments at the OMEGA-EP facility by varying the laser pulse length τ —spanning 3 orders of magnitude from 100 ps to 10 ns—while maintaining a constant peak laser intensity, I 0 = 5 × 10 14 W/ cm 2 . In theoretical models, the ablation pressure primarily scales for a given material with laser intensity and wavelength, which are all fixed variables here, allowing us to explore the specific role of laser pulse duration. Two-dimensional radiation-hydrodynamics simulations benchmarked with optical probing of the expanding plasma show that the pulse duration is critical for the ablation pressure to reach a steady state. Moreover, the pulse duration impacts shock decay and multiple wave effects, which strongly dictate the evolving shock profile that propagates within the laser-shocked target as ultimately measured by rear-surface diagnostics. The shock velocities inferred from the theoretical model, after considering shock decay, impedance matching, and shock Hugoniot, are found to be in good agreement with velocimetry measurements. However, discrepancies are observed with simulations for the shorter (0.1 ns) and longer (10 ns) pulse durations, which are respectively attributed to unaccounted contributions of kinetic absorption mechanisms and instabilities in simulations. Published by the American Physical Society 2024

Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
SC0021061
OSTI ID:
2397020
Journal Information:
Physical Review Research, Journal Name: Physical Review Research Journal Issue: 3 Vol. 6; ISSN PPRHAI; ISSN 2643-1564
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (48)

Dynamic Behavior of Materials book September 1994
Femtosecond laser ablation of silicon–modification thresholds and morphology journal January 2002
Mechanisms of laser ablation from molecular dynamics simulations: dependence on the initial temperature and pulse duration journal December 1999
Characteristics of target interaction with high power UV laser radiation journal October 1981
SPECT3D – A multi-dimensional collisional-radiative code for generating diagnostic signatures based on hydrodynamics and PIC simulation output journal May 2007
HELIOS-CR – A 1-D radiation-magnetohydrodynamics code with inline atomic kinetics modeling journal May 2006
Physics of ultra-short laser interaction with matter: From phonon excitation to ultimate transformations journal September 2013
Laser-produced blast wave and numerical simulation using the FLASH code journal October 2005
Fast heating of ultrahigh-density plasma as a step towards laser fusion ignition journal August 2001
Parametric instabilities of electromagnetic waves in plasmas journal January 1974
Femtosecond melting and ablation of semiconductors studied with time of flight mass spectroscopy journal March 1999
Emission features and expansion dynamics of nanosecond laser ablation plumes at different ambient pressures journal January 2014
Measurements of electron density profiles using an angular filter refractometer journal May 2014
The effects of pulse duration on ablation pressure driven by laser radiation journal March 2015
From microjoules to megajoules and kilobars to gigabars: Probing matter at extreme states of deformation journal September 2015
Analysis of laser shock experiments on precompressed samples using a quartz reference and application to warm dense hydrogen and helium journal November 2015
Identifying and discriminating phase transitions along decaying shocks with line imaging Doppler interferometric velocimetry and streaked optical pyrometry journal January 2016
Absolute calibration of the OMEGA streaked optical pyrometer for temperature measurements of compressed materials journal November 2016
Calibration and characterization of a highly efficient spectrometer in von Hamos geometry for 7-10 keV x-rays journal April 2017
Laser-driven magnetized liner inertial fusion journal June 2017
Angular filter refractometry analysis using simulated annealing journal October 2017
Extension of the Hugoniot and analytical release model of α -quartz to 0.2–3 TPa journal July 2017
X-ray spectrometer throughput model for (selected) flat Bragg crystal spectrometers on laser plasma facilities journal October 2018
Self-similar expansion of a plasma into a vacuum journal January 1979
Theoretical model of absorption of laser light by a plasma journal January 1982
Steady-state planar ablative flow journal January 1982
Development of the indirect‐drive approach to inertial confinement fusion and the target physics basis for ignition and gain journal November 1995
A model of ultrashort laser pulse absorption in solid targets journal January 1996
Imaging velocity interferometer system for any reflector (VISAR) diagnostics for high energy density sciences journal January 2023
Improved filters for angular filter refractometry journal February 2024
On Validating an Astrophysical Simulation Code journal November 2002
Detection of the Electromagnetic Radiation from Nuclear Explosions in Space journal March 1965
Formation and decay of laser-generated shock waves journal January 1982
Shock-compressed silicon: Hugoniot and sound speed up to 2100 GPa journal March 2021
Absolute measurement of the Hugoniot and sound velocity of liquid copper at multimegabar pressures journal November 2017
Ablation pressure scaling at short laser wavelength journal December 2003
Shock pressures induced in condensed matter by laser ablation journal March 2004
Shock Ignition: A New Approach to High Gain Inertial Confinement Fusion on the National Ignition Facility journal July 2009
High-Power γ -Ray Flash Generation in Ultraintense Laser-Plasma Interactions journal May 2012
Laser-Driven Shock Acceleration of Monoenergetic Ion Beams journal November 2012
Astrophysics of Magnetically Collimated Jets Generated from Laser-Produced Plasmas journal January 2013
Shock Ignition Laser-Plasma Interactions in Ignition-Scale Plasmas journal August 2021
Effect of Laser Wavelength and Pulse Duration on Laser-Light Absorption and Back Reflection journal April 1982
Crystal structure and equation of state of Fe-Si alloys at super-Earth core conditions journal April 2018
Shock compression of stishovite and melting of silica at planetary interior conditions journal January 2015
High-Energy Petawatt Capability for the Omega Laser journal January 2005
Laser-Material Interaction of Powerful Ultrashort Laser Pulses report January 2003
Simple model for decay of laser generated shock waves report October 1980