Measurement of multiphoton absorption and electron avalanche in optical thin films

Measurements on nonlinear processes caused by multiphoton absorption and electron avalanche in optical thin films have been carried out using KrF lasers of 20-ns and 1.7-ps pulse duration. Multiphoton absorption of the order of 10-7 J was detected by a photoacoustic signal, and the nonlinear growth of photo-induced current due to the electron avalanche was analyzed dynamically. The correlation between damage threshold and carrier lifetime was investigated for oxide and fluoride coatings.

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The observation of nano-voids in Au thin films

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100126627 ◽

1987 ◽

Vol 45 ◽

pp. 366-367

Author(s):

William Krakow

Keyword(s):

Thin Films ◽

Melting Point ◽

Present Author ◽

Stacking Faults ◽

Damage Threshold ◽

Ionic Species ◽

Rare Gases ◽

Chain Defects ◽

Vacancy Chains ◽

Au Thin Films

It has long been known that defects such as stacking faults and voids can be quenched from various alloyed metals heated to near their melting point. Today it is common practice to irradiate samples with various ionic species of rare gases which also form voids containing solidified phases of the same atomic species, e.g. ref. 3. Equivalently, electron irradiation has been used to produce damage events, e.g. ref. 4. Generally all of the above mentioned studies have relied on diffraction contrast to observe the defects produced down to a dimension of perhaps 10 to 20Å. Also all these studies have used ions or electrons which exceeded the damage threshold for knockon events. In the case of higher resolution studies the present author has identified vacancy and interstitial type chain defects in ion irradiated Si and was able to identify both di-interstitial and di-vacancy chains running through the foil.

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Laser pulse duration effects in Xe2+ ions induced by multiphoton absorption at 0.53 μm

Journal de Physique ◽

10.1051/jphys:0198300440110124700 ◽

1983 ◽

Vol 44 (11) ◽

pp. 1247-1255 ◽

Cited By ~ 31

Author(s):

A. L'Huillier ◽

L.A. Lompre ◽

G. Mainfray ◽

C. Manus

Keyword(s):

Laser Pulse ◽

Pulse Duration ◽

Laser Pulse Duration ◽

Multiphoton Absorption

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Ablation of transition metal oxides by different laser pulse duration and thin films deposition

Applied Surface Science ◽

10.1016/s0169-4332(99)00397-9 ◽

2000 ◽

Vol 154-155 ◽

pp. 467-472 ◽

Cited By ~ 13

Author(s):

A Giardini Guidoni ◽

C Flamini ◽

F Varsano ◽

M Ricci ◽

R Teghil ◽

...

Keyword(s):

Thin Films ◽

Transition Metal ◽

Laser Pulse ◽

Metal Oxides ◽

Pulse Duration ◽

Transition Metal Oxides ◽

Laser Pulse Duration

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A Novel Approach to Photoacoustic FT-IR Spectroscopy: Rheo-Photoacoustic Measurements

Applied Spectroscopy ◽

10.1366/0003702894204452 ◽

1989 ◽

Vol 43 (8) ◽

pp. 1387-1393 ◽

Cited By ~ 18

Author(s):

William F. McDonald ◽

Hans Goeitler ◽

Marek W. Urban

Keyword(s):

Molecular Structure ◽

Thin Films ◽

Fourier Transform ◽

Acoustic Waves ◽

Polymeric Materials ◽

Photoacoustic Signal ◽

Novel Approach ◽

Ft Ir ◽

Property Changes ◽

Ft Ir Spectroscopy

A new rheo-photoacoustic Fourier transform infrared cell has been developed to perform stress-strain studies on polymeric materials. The rheo-photoacoustic measurements lead to the enhancement of the photoacoustic signal and allow one to monitor the effect of elongational forces on the molecular structure of polymers. Propagating acoustic waves are detected as a result of the deformational changes and thermal property changes upon the applied stress. Applications of this technique to fibers, films, and adhesion of thin films are presented.

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