Penetration of laser light at 808 and 980 nm in bovine tissue samples

Photomed Laser Surg. 2013 Apr;31(4):163-8. doi: 10.1089/pho.2012.3284. Epub 2013 Feb 26.


Objective: The purpose of this study was to compare the penetration of 808 and 980 nm laser light through bovine tissue samples 18-95 mm thick.

Background data: Low-level laser therapy (LLLT) is frequently used to treat musculoskeletal pathologies. Some of the therapeutic targets are several centimeters deep.

Methods: Laser light at 808 and 980 nm (1 W/cm(2)) was projected through bovine tissue samples ranging in thickness from 18 to 95 mm. Power density measurements were taken for each wavelength at the various depths.

Results: For 808 nm, 1 mW/cm(2) was achieved at 3.4 cm, but for 980 nm, 1 mW/cm(2) was achieved at only 2.2 cm depth of tissue.

Conclusions: It was determined that 808 nm of light penetrates as much as 54% deeper than 980 nm light in bovine tissue.

MeSH terms

  • Animals
  • Cattle
  • Lasers*
  • Meat / radiation effects*
  • Software