Dynamic measurements of laser light attenuation by cryogen film and frost formation

Bernard Choi, Guillermo Aguilar, Gracie Vargas, A. J. Welch, J. Stuart Nelson

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

5 Citations (Scopus)

Abstract

The purpose of this study was to investigate the dynamics of laser light attenuation during cryogen spray cooling (CSC). Two detection schemes were used to approximate collimated and diffuse light transmittance measurements of continuous-wave (λ = 594 nm) and pulsed (λ = 585 nm) laser light during application of short (20-100 ms duration) cryogen spurts on a glass substrate. High-speed video images were also obtained during CSC. Collimated light transmittance varied considerably during CSC. Comparison of collimated and total transmitted light detection indicated that the diffuse component was substantial. Light attenuation occurred despite transparency of the liquid cryogen layer. Light scattering by cryogen results in a diverging laser beam incident on the skin surface. Since specular reflectance at the cryogen-skin interface may differ for diffuse light, further study of light scattering during CSC is warranted. Due to the differences in optical properties of glass and skin, experiments on skin need to be performed to extrapolate our results to the clinical scenario. For dermatologic procedures such as laser port wine stain and vascular lesion removal, hair removal, and nonablative skin rejuvenation, recommended τ d are 10-80 ms. This range of τ d appears to be appropriate, although more studies are required to arrive at a definite conclusion.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsW.T.W. Riese, K.E. Bartels, L.S. Bass, K.W. Gregory
Pages57-66
Number of pages10
Volume4609
DOIs
StatePublished - 2002
Externally publishedYes
EventLasers in Surgery: Advanced Characterization, Therapeutics, and Systems XII - San Jose, CA, United States
Duration: Jan 19 2002Jan 22 2002

Other

OtherLasers in Surgery: Advanced Characterization, Therapeutics, and Systems XII
CountryUnited States
CitySan Jose, CA
Period1/19/021/22/02

Fingerprint

frost
attenuation
Skin
Lasers
sprayers
lasers
Cooling
cooling
Light scattering
transmittance
light scattering
wines
Glass
Wine
glass
hair
Transparency
lesions
continuous radiation
Laser beams

Keywords

  • Cryogen spray cooling
  • Dermatology
  • Port wine stains
  • Skin
  • Transmittance

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Choi, B., Aguilar, G., Vargas, G., Welch, A. J., & Stuart Nelson, J. (2002). Dynamic measurements of laser light attenuation by cryogen film and frost formation. In W. T. W. Riese, K. E. Bartels, L. S. Bass, & K. W. Gregory (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 4609, pp. 57-66) https://doi.org/10.1117/12.432051

Dynamic measurements of laser light attenuation by cryogen film and frost formation. / Choi, Bernard; Aguilar, Guillermo; Vargas, Gracie; Welch, A. J.; Stuart Nelson, J.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / W.T.W. Riese; K.E. Bartels; L.S. Bass; K.W. Gregory. Vol. 4609 2002. p. 57-66.

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

Choi, B, Aguilar, G, Vargas, G, Welch, AJ & Stuart Nelson, J 2002, Dynamic measurements of laser light attenuation by cryogen film and frost formation. in WTW Riese, KE Bartels, LS Bass & KW Gregory (eds), Proceedings of SPIE - The International Society for Optical Engineering. vol. 4609, pp. 57-66, Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems XII, San Jose, CA, United States, 1/19/02. https://doi.org/10.1117/12.432051
Choi B, Aguilar G, Vargas G, Welch AJ, Stuart Nelson J. Dynamic measurements of laser light attenuation by cryogen film and frost formation. In Riese WTW, Bartels KE, Bass LS, Gregory KW, editors, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4609. 2002. p. 57-66 https://doi.org/10.1117/12.432051
Choi, Bernard ; Aguilar, Guillermo ; Vargas, Gracie ; Welch, A. J. ; Stuart Nelson, J. / Dynamic measurements of laser light attenuation by cryogen film and frost formation. Proceedings of SPIE - The International Society for Optical Engineering. editor / W.T.W. Riese ; K.E. Bartels ; L.S. Bass ; K.W. Gregory. Vol. 4609 2002. pp. 57-66
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