Space-Time Resolved Reflectivity Measurements of Picosecond Laser Induced Phase Transitions in Silicon

1981 ◽  
Vol 4 ◽  
Author(s):  
R. Yen ◽  
J. M. Liu ◽  
H. Kurz ◽  
N. Bloembergen
Keyword(s):  
Silicon Surface ◽  
Local Thermodynamic Equilibrium ◽  
Picosecond Laser ◽  
Quantitative Agreement ◽  
Picosecond Pulse ◽  
Time Resolved ◽  
Picosecond Time Scale ◽  
Type Pattern ◽  
Heating Model ◽  
Reflectivity Data

ABSTRACTThe changes in reflectivity of a silicon surface, irradiated by a green picosecond pulse, are probed during and following that pulse with a spatial resolution of 10μm. The data indicate the development of a liquid phase, and a resolidification either into a single crystal or an amorphous phase. The latter has a characteristic ring-type pattern, and occurs only at locations where the incident picosecond laser fluence lies between 0.2 and 0.26 J/cm2. The reflectivity data appear to be in good quantitative agreement with a “simple heating” model, in which the electrons and phonons maintain a local thermodynamic equilibrium on a picosecond time scale.

Picosecond Photon-Solid Interaction

1984 ◽  
Vol 35 ◽  
Author(s):  
H. Kurz ◽  
N. Bloembergen
Keyword(s):  
Phase Transition ◽  
Picosecond Laser ◽  
Laser Pulses ◽  
Time Resolved ◽  
Electron Hole Plasma ◽  
Optical Heating ◽  
Main Emphasis ◽  
Firm Data ◽  
Heating Model ◽  
Recent Experimental Work

ABSTRACTSome of the fundamental aspects of pulsed laser interactions with semiconductors are reviewed within the frame of recent experimental work with picosecond laser pulses. Main emphasis is placed on data obtained in space-time resolved measurements of transmission and reflectivity of picosecond pulse irradiated silicon at different probing wavelengths. Four distinct interaction regimes can be defined, depending on the fluence of the laser pulse. Special attention is devoted to the phase transition from solid to liquid state at the surface. The optical heating model is found to be valid even on a time scale of picoseconds. Firm data of the electron-hole plasma density and lattice temperature are derived. The thermal nature of the phase transition is confirmed.

Root Cause Analysis Techniques Using Picosecond Time Resolved LADA

2014 ◽  
Author(s):  
Dan Bodoh ◽  
Kent Erington ◽  
Kris Dickson ◽  
George Lange ◽  
Carey Wu ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Picosecond Laser ◽  
Root Cause Analysis ◽  
Fault Isolation ◽  
Time Resolved ◽  
Cause Analysis ◽  
Root Cause ◽  
Design And Manufacturing ◽  
Multiple Interactions ◽  
Established Technique

Abstract Laser-assisted device alteration (LADA) is an established technique used to identify critical speed paths in integrated circuits. LADA can reveal the physical location of a speed path, but not the timing of the speed path. This paper describes the root cause analysis benefits of 1064nm time resolved LADA (TR-LADA) with a picosecond laser. It shows several examples of how picosecond TR-LADA has complemented the existing fault isolation toolset and has allowed for quicker resolution of design and manufacturing issues. The paper explains how TR-LADA increases the LADA localization resolution by eliminating the well interaction, provides the timing of the event detected by LADA, indicates the propagation direction of the critical signals detected by LADA, allows the analyst to infer the logic values of the critical signals, and separates multiple interactions occurring at the same site for better understanding of the critical signals.

Picosecond laser structuring of monocrystalline silicon surface

2013 ◽  
Author(s):  
Igor Guk ◽  
Galina Shandybina ◽  
Eugeny Yakovlev ◽  
Leonid Golovan
Keyword(s):  
Silicon Surface ◽  
Picosecond Laser ◽  
Monocrystalline Silicon ◽  
Laser Structuring

Wavelength-tunable picosecond laser source based on filtering and amplifying broadband dissipative soliton pulse

Laser Physics ◽  
2021 ◽  
Vol 32 (1) ◽  
pp. 015103
Author(s):  
Jing Li ◽  
Chuncan Wang ◽  
Peng Wang ◽  
Pengtao Liu ◽  
Junhao Lan ◽  
...  
Keyword(s):  
Picosecond Laser ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Picosecond Pulse ◽  
Dissipative Soliton ◽  
Laser Source ◽  
Seed Pulse ◽  
Practical Applications ◽  
Wavelength Tunable ◽  
Wavelength Control

Abstract A method for obtaining picosecond pulse sources with continuously tunable central wavelengths is demonstrated numerically and experimentally. A dissipative soliton (DS) mode-locked erbium-doped fiber (EDF) laser based on the nonlinear polarization rotation provides the seed pulse with a flat-top spectral profile and a 55 nm spectral bandwidth. Then it is filtered by a wavelength-tunable super-Gaussian bandpass filter and amplified by two segments of EDFs with different doping concentrations. The output DS pulse from the EDF laser can be compressed from 5.532 ps to 0.291 ps by using a single-mode fiber (SMF-28e), while the pulse energy is about 1.6 nJ. Furthermore, the about 4 ps and 6.84 nJ pulses with continuously tunable central wavelengths ranging from 1535 to 1580 nm can be obtained by amplifying the spectrally filtered pulses. The tunable picosecond pulse source based on the extra-cavity filtering method is very useful for many practical applications because of its flexible wavelength control.

scholarly journals In situ structural kinetics of picosecond laser-induced heating and fragmentation of colloidal gold spheres

2020 ◽  
Vol 22 (9) ◽  
pp. 4993-5001 ◽  
Author(s):  
Anna Rosa Ziefuss ◽  
Stefan Reich ◽  
Sven Reichenberger ◽  
Matteo Levantino ◽  
Anton Plech
Keyword(s):  
Colloidal Gold ◽  
Picosecond Laser ◽  
Time Resolved ◽  
Gold Colloids ◽  
X Ray ◽  
X Ray Scattering ◽  
Kinetics Of ◽  
Ray Scattering

The structural and energetic pathway of picosecond laser fragmentation of gold colloids has been clarified by time-resolved X-ray scattering.

Time-resolved investigation of the plasma expansion during picosecond laser material processing

1997 ◽  
Author(s):  
G. Urbasch ◽  
F. Billmann ◽  
Juergen Jandeleit ◽  
P. Russbueldt ◽  
Hans-Georg Treusch ◽  
...  
Keyword(s):  
Material Processing ◽  
Picosecond Laser ◽  
Plasma Expansion ◽  
Laser Material Processing ◽  
Time Resolved ◽  
Laser Material
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