Absorption of infrared radiation in metallic capillaries

Anisimov, Vladimir N.; Bolshov, L. A.; Krivoruchko, K. A.; Malyuta, D D; Reshetin, V. P.; Sebrant, A Yu; Soloukhin, R. I.

doi:10.1070/qe1987v017n01abeh006449

Cited by 5 publications

(2 citation statements)

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“…For numerical estimates we consider drilling of Al with 0.8 micron radiation. The dielectric constant for Al at this wavelength is ε=-61.5 +45.7i, 16 and the typical hole radius a=100 m. The similar linear problem of CO 2 laser propagation in metallic capillaries was studied in [17] and we will adopt their results for our case.…”

Section: The Interaction Of Radiation With the Wallsmentioning

confidence: 99%

Metal processing with ultrashort laser pulses

Banks

Felt

Komashko

et al. 2000

Proceedings of SPIE

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Femtosecond laser ablation has been shown to produce well-defined cuts and holes in metals with minimal heat effect to the remaining material. Ultrashort laser pulse processing shows promise as an important technique for materials processing. We will discuss the physical effects associated with processing based experimental and modeling results. Intense ultra-short laser pulse (USLP) generates high pressures and temperatures in a subsurface layer during the pulse, which can strongly modify the absorption. We carried out simulations of USLP absorption versus material and pulse parameters. The ablation rate as function of the laser parameters has been estimated. Since every laser pulse removes only a small amount of material, a practical laser processing system must have high repetition rate. We will demonstrate that planar ablation is unstable and the initially smooth crater bottom develops a corrugated pattern after many tens of shots. The corrugation growth rate, angle of incidence and the polarization of laser electric field dependence will be discussed. In the nonlinear stage, the formation of coherent structures with scales much larger than the laser wavelength was observed. Also, there appears to be a threshold fluence above which a narrow, nearly perfectly circular channel forms after a few hundred shots. Subsequent shots deepen this channel without significantly increasing its diameter. The role of light absorption in the hole walls will be discussed.

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Section: The Interaction Of Radiation With the Wallsmentioning

confidence: 99%

Metal processing with ultrashort laser pulses

Banks

Felt

Komashko

et al. 2000

Proceedings of SPIE

View full text Add to dashboard Cite

show abstract

“…[17] Although the experimental conditions between this work and that in Ref. 17 differed in hole diameter, wavelength and pulse duration, the underlying concepts of optical confinement and attenuation are relevant and can be used as a basis for future modeling specific to our circumstances.…”

Section: Fill Hole Formation and Laser Confinementmentioning

confidence: 99%