Velocity measurements in the nanosecond range realised by variably delayed dye laser exposition

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

An imaging system with nanosecond resolution was developed and used for investigation of excimer laser induced ablation. The photographic recordings were made by means of a videocamera equipped with a microscope. Dye laser pulses used for exposition were delayed appropriately with respect to the incidence of the excimer laser light. The movement of the plume ejected from the sample and the propagation of the mechanical waves developed in and above the sample were visualised. Using single recording pulses the distance-time functions were obtained. The velocity-time functions were calculated by derivation of those. Applying a Michelson interferometer for generating double exposing dye laser pulses with delay dt, the average velocity for dt could be measured directly. The propagation velocity of shock waves originating from the polymethyl-methacrylate surface was investigated by this technique in Schlieren arrangement. Velocities as high as 40 times the sound velocity in the air were measured. The material ablated from the polymethyl-methacrylate was observed in vacuum by single exposition transmission arrangement. During the excimer laser ablation of cornea several phenomena occur, such as shock wave in the air, shear wave on the surface, internal acoustic wave, plume ejection and so on. The characteristic velocities of these are shown.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsP.K. Rastogi, F Gyimesi
Pages291-296
Number of pages6
Volume3407
DOIs
Publication statusPublished - 1998
EventInternational Conference on Applied Optical Metrology - Balatonfured, Hungary
Duration: Jun 8 1998Jun 11 1998

Other

OtherInternational Conference on Applied Optical Metrology
CountryHungary
CityBalatonfured
Period6/8/986/11/98

Fingerprint

Dye lasers
velocity measurement
dye lasers
Velocity measurement
excimer lasers
Excimer lasers
time functions
polymethyl methacrylate
plumes
shock waves
Polymethyl methacrylates
Shock waves
photographic recording
pulses
Laser pulses
Mechanical waves
cornea
propagation velocity
air
Michelson interferometers

Keywords

  • Ablation
  • Fast photography
  • Ns exposition
  • Velocity measurement

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Márton, Z., Hopp, B., Tóth, Z., Csete, M., Ignácz, F., & Bor, Z. (1998). Velocity measurements in the nanosecond range realised by variably delayed dye laser exposition. In P. K. Rastogi, & F. Gyimesi (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 3407, pp. 291-296) https://doi.org/10.1117/12.323327

Velocity measurements in the nanosecond range realised by variably delayed dye laser exposition. / Márton, Zs; Hopp, B.; Tóth, Z.; Csete, M.; Ignácz, F.; Bor, Z.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / P.K. Rastogi; F Gyimesi. Vol. 3407 1998. p. 291-296.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Márton, Z, Hopp, B, Tóth, Z, Csete, M, Ignácz, F & Bor, Z 1998, Velocity measurements in the nanosecond range realised by variably delayed dye laser exposition. in PK Rastogi & F Gyimesi (eds), Proceedings of SPIE - The International Society for Optical Engineering. vol. 3407, pp. 291-296, International Conference on Applied Optical Metrology, Balatonfured, Hungary, 6/8/98. https://doi.org/10.1117/12.323327
Márton Z, Hopp B, Tóth Z, Csete M, Ignácz F, Bor Z. Velocity measurements in the nanosecond range realised by variably delayed dye laser exposition. In Rastogi PK, Gyimesi F, editors, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3407. 1998. p. 291-296 https://doi.org/10.1117/12.323327
Márton, Zs ; Hopp, B. ; Tóth, Z. ; Csete, M. ; Ignácz, F. ; Bor, Z. / Velocity measurements in the nanosecond range realised by variably delayed dye laser exposition. Proceedings of SPIE - The International Society for Optical Engineering. editor / P.K. Rastogi ; F Gyimesi. Vol. 3407 1998. pp. 291-296
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