Abstract
The dynamics of the water absorption peak around 1.94 μm was examined. This peak is important for the absorption of holmium and thulium laser radiation. To examine the effect of temperature on the absorption coefficient, the transmission of light through water of 22, 49 and 70 °C was measured from 1850-2150 nm with a spectrophotometer. It was found that the absorption peak at 1.94 μm (at 22 °C) shifts to shorter wavelengths with increasing temperatures, to 1.92 μm at 70 °C. It was also seen that the absorption peak increases slightly with increasing temperature. Secondly, a pulsed Ho:YAG laser (λ =2.12 μm) was coupled into a 600 μm low OH fiber (pulse duration 200μs, radiant exposure 70.7 mJ/mm2). The transmission was measured as a function of the thickness of the water layer at 22,49 and 70 °C. It was found that the absorption coefficient at this wavelength decreases with increasing temperature. A finite difference model was developed to predict the temperature distribution due to a single Holmium:YAG laser pulse incorporating the dynamic change in absorpüon coefficient with temperature that was measured with the spectrophotometer. The temperature distributions are compared to the predictions of a model assuming constant optical properties. It is shown in this paper that the dynamics of the absorption coefficient has a significant influence on the expected zone of damage and ablation parameters in the 2 μm wavelength range.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 195-201 |
| Number of pages | 7 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 2077 |
| DOIs | |
| State | Published - Feb 1 1994 |
| Event | Laser Interaction with Hard and Soft Tissue 1993 - Budapest, Hungary Duration: Aug 29 1993 → Sep 3 1993 |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering
Cite this
The effect of temperature on the absorption coefficient of water for holmium : YAG laser light. / Jansen, E. Duco; Van Leeuwen, Ton G.; Motamedi, Massoud; Borst, C.; Welch, A. J.
In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 2077, 01.02.1994, p. 195-201.Research output: Contribution to journal › Conference article
}
TY - JOUR
T1 - The effect of temperature on the absorption coefficient of water for holmium
T2 - YAG laser light
AU - Jansen, E. Duco
AU - Van Leeuwen, Ton G.
AU - Motamedi, Massoud
AU - Borst, C.
AU - Welch, A. J.
PY - 1994/2/1
Y1 - 1994/2/1
N2 - The dynamics of the water absorption peak around 1.94 μm was examined. This peak is important for the absorption of holmium and thulium laser radiation. To examine the effect of temperature on the absorption coefficient, the transmission of light through water of 22, 49 and 70 °C was measured from 1850-2150 nm with a spectrophotometer. It was found that the absorption peak at 1.94 μm (at 22 °C) shifts to shorter wavelengths with increasing temperatures, to 1.92 μm at 70 °C. It was also seen that the absorption peak increases slightly with increasing temperature. Secondly, a pulsed Ho:YAG laser (λ =2.12 μm) was coupled into a 600 μm low OH fiber (pulse duration 200μs, radiant exposure 70.7 mJ/mm2). The transmission was measured as a function of the thickness of the water layer at 22,49 and 70 °C. It was found that the absorption coefficient at this wavelength decreases with increasing temperature. A finite difference model was developed to predict the temperature distribution due to a single Holmium:YAG laser pulse incorporating the dynamic change in absorpüon coefficient with temperature that was measured with the spectrophotometer. The temperature distributions are compared to the predictions of a model assuming constant optical properties. It is shown in this paper that the dynamics of the absorption coefficient has a significant influence on the expected zone of damage and ablation parameters in the 2 μm wavelength range.
AB - The dynamics of the water absorption peak around 1.94 μm was examined. This peak is important for the absorption of holmium and thulium laser radiation. To examine the effect of temperature on the absorption coefficient, the transmission of light through water of 22, 49 and 70 °C was measured from 1850-2150 nm with a spectrophotometer. It was found that the absorption peak at 1.94 μm (at 22 °C) shifts to shorter wavelengths with increasing temperatures, to 1.92 μm at 70 °C. It was also seen that the absorption peak increases slightly with increasing temperature. Secondly, a pulsed Ho:YAG laser (λ =2.12 μm) was coupled into a 600 μm low OH fiber (pulse duration 200μs, radiant exposure 70.7 mJ/mm2). The transmission was measured as a function of the thickness of the water layer at 22,49 and 70 °C. It was found that the absorption coefficient at this wavelength decreases with increasing temperature. A finite difference model was developed to predict the temperature distribution due to a single Holmium:YAG laser pulse incorporating the dynamic change in absorpüon coefficient with temperature that was measured with the spectrophotometer. The temperature distributions are compared to the predictions of a model assuming constant optical properties. It is shown in this paper that the dynamics of the absorption coefficient has a significant influence on the expected zone of damage and ablation parameters in the 2 μm wavelength range.
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UR - http://www.scopus.com/inward/citedby.url?scp=0005290934&partnerID=8YFLogxK
U2 - 10.1117/12.168029
DO - 10.1117/12.168029
M3 - Conference article
AN - SCOPUS:0005290934
VL - 2077
SP - 195
EP - 201
JO - Proceedings of SPIE - The International Society for Optical Engineering
JF - Proceedings of SPIE - The International Society for Optical Engineering
SN - 0277-786X
ER -