Ultrafast Multiphoton Absorption in Optical-Coating Materials at Near-Damage-Threshold Fluence

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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RELATIONSHIP BETWEEN MICRO-STRUCTURE AND LASER DAMAGE THRESHOLD OF NANO-ZrO2 FILMS

International Journal of Modern Physics B ◽

10.1142/s0217979205029092 ◽

2005 ◽

Vol 19 (01n03) ◽

pp. 585-587 ◽

Cited By ~ 2

Author(s):

L. H. DUAN ◽

A. P. LIU ◽

S. L. CHEN ◽

W. L. WANG ◽

P. MA ◽

...

Keyword(s):

Electron Beams ◽

Damage Threshold ◽

Amorphous Structure ◽

Laser Damage Threshold ◽

Laser Damage ◽

X Ray Diffraction ◽

Micro Structure ◽

Polycrystalline Structure ◽

Coating Materials ◽

X Ray

In this paper, the micro-structure and laser damage threshold of nano- ZrO 2 thin films were investigated. High-purity nano- ZrO 2 particles as the coating materials of samples were prepared by the electron beams evaporation. The micro-structure and crystallitic size of samples were analyzed by X-ray diffraction, a laser by 1064nm, 10ns, 3Hz Nd:YAG laser damage test each for nano- ZrO 2 films. The results showed that oxygen partial pressure has an important influence on the micro-structure of nano- ZrO 2 films, also found that the crystallitic size and different micro-structure influenced the laser damage threshold. The obtained results showed that laser damage threshold of polycrystalline structure is obviously higher than that of amorphous structure.

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Elastic Polymer Guest-Host Optical Limiters

MRS Proceedings ◽

10.1557/proc-479-83 ◽

1997 ◽

Vol 479 ◽

Cited By ~ 1

Author(s):

M. E. De Rosa ◽

W. Su ◽

M. C. Brant ◽

D. G. Mclean

Keyword(s):

Mechanical Properties ◽

Glass Transition ◽

Damage Threshold ◽

Thermomechanical Properties ◽

Laser Damage Threshold ◽

Laser Damage ◽

Threshold Fluence ◽

Optical Limiters ◽

Order Of Magnitude ◽

Elastic Polymer

AbstractThis paper presents the results of the bulk laser damage performance of undoped epoxy thermosets with glassy and rubbery mechanical properties and two commercial polymethylmethacrylate (PMMA) samples. We demonstrate how thermomechanical properties such as glass transition temperature (Tg) and equilibrium shear modulus (Ge) affect laser damage threshold. The rubbery epoxy elastomer shows a damage threshold fluence one order of magnitude higher than PMMA and 2.5 orders of magnitude higher than a glassy epoxy thermoset. A solid-state guest-host limiter is made by doping the epoxy elastomer with zinc octabromotetraphenylporphyrin (ZnOBP). The limiting performance of the elastomer limiter is compared to a solution of ZnOBP and C60 in toluene. Photochemical hysteresis effects in the solid limiter were also investigated.

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