Photon absorption of conduction band electronsand impact ionization under irradiation of few-cycle ultrashort laser pulses

2005 ◽  
Vol 54 (7) ◽  
pp. 3451
Author(s):  
Wang Xiao-Feng ◽  
Jia Tian-Qing ◽  
Xu Zhi-Zhan
Keyword(s):  
Conduction Band ◽  
Impact Ionization ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Photon Absorption ◽  
Ultrashort Laser

Transient Reflectance Response to Hot Electron Relaxation in InP Based Films

2002 ◽  
Author(s):  
J. Michael Klopf ◽  
John L. Hostetler ◽  
Pamela M. Norris
Keyword(s):  
Thin Film ◽  
Transient Absorption ◽  
Film Growth ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Photon Absorption ◽  
Hot Electron ◽  
Carrier Relaxation ◽  
Hot Carrier ◽  
Ultrashort Laser

Advancements in technologies related to thin film growth have led to astoundingly complex integrated photonic devices. The reliability of these devices relies upon the precise control of the band gap and absorption mechanisms in the thin film structures. Photon absorption in these devices can result in a reduction of laser efficiency as well as thermal runaway. To improve device performance prediction, an increased understanding of the localized absorption processes is paramount. A pump-probe technique is being developed to measure the transient absorption during hot carrier relaxation. This method relies upon the generation of hot carriers by the absorption of an intense ultrashort laser pulse. The change in reflectance due to hot carrier generation and relaxation is monitored using a probe pulse focused at the center of the excited region. The transient reflectance is measured as a function of the relative delay between the pump and probe pulses. Utilizing ultrashort laser pulses (τp ∼ 190 fs) it is possible to attain sub-picosecond resolution of the transient reflectance during hot carrier relaxation. Transient changes in the reflectance can then be related to transient changes in the absorption mechanisms of the film. Preliminary measurements made with this technique have shown clear differences in the transient reflectance of doped and undoped Indium Phosphide (InP) based films. This study will form the basis for development of a transient thermoreflectance model during hot carrier relaxation in III-V semiconductors.

Electron heating in the conduction band of insulators irradiated by ultrashort laser pulses

2006 ◽  
Vol 74 (23) ◽  
Author(s):  
H. Bachau ◽  
A. N. Belsky ◽  
P. Martin ◽  
A. N. Vasil’ev ◽  
B. N. Yatsenko
Keyword(s):  
Conduction Band ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Electron Heating ◽  
Ultrashort Laser

Coherent control of two-photon absorption of Pr3+ ion by shaped ultrashort laser pulses

2013 ◽  
Vol 11 (4) ◽  
pp. 041903-41906 ◽  
Author(s):  
Wenjing Cheng Wenjing Cheng ◽  
Shian Zhang Shian Zhang ◽  
Tianqing Jia Tianqing Jia ◽  
Jing Ma Jing Ma ◽  
Donghai Feng Donghai Feng ◽  
...  
Keyword(s):  
Coherent Control ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Ultrashort Laser

Coherent quantum control of two-photon absorption and polymerization by shaped ultrashort laser pulses

2013 ◽  
Vol 10 (8) ◽  
pp. 085304 ◽  
Author(s):  
Jing Ma ◽  
Wenjing Cheng ◽  
Shian Zhang ◽  
Donghai Feng ◽  
Tianqing Jia ◽  
...  
Keyword(s):  
Quantum Control ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Ultrashort Laser ◽  
Coherent Quantum

Welding characteristics of foturan glass using ultrashort laser pulses

2012 ◽  
Author(s):  
Isamu Miyamoto ◽  
Kristian Cvecek ◽  
Yasuhiro Okamoto ◽  
Michael Schmidt ◽  
Henry Helvajian
Keyword(s):  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Ultrashort Laser

Evaluation of Chip-Breakers Manufactured by Ultrashort Laser Pulses in Cemented Carbide Tools

2017 ◽  
Author(s):  
Marcelo Bertolete Carneiro ◽  
Patrícia Alves Barbosa ◽  
Ricardo Samad ◽  
NIlson Vieira ◽  
Wagner de Rossi ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Cemented Carbide ◽  
Cemented Carbide Tools ◽  
Ultrashort Laser

Picosecond Single-Photon and Femtosecond Two-Photon Pulsed Laser Stimulation for IC Characterization and Failure Analysis

2009 ◽  
Author(s):  
V. Pouget ◽  
E. Faraud ◽  
K. Shao ◽  
S. Jonathas ◽  
D. Horain ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Single Photon ◽  
Pulsed Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Laser Stimulation ◽  
Two Photon ◽  
Resolution Improvement ◽  
Ultrashort Laser

Abstract This paper presents the use of pulsed laser stimulation with picosecond and femtosecond laser pulses. We first discuss the resolution improvement that can be expected when using ultrashort laser pulses. Two case studies are then presented to illustrate the possibilities of the pulsed laser photoelectric stimulation in picosecond single-photon and femtosecond two-photon modes.

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