The Effect of Optical Design on Micromanipulator Spot Size Using CO2 Laser Irradiation

OBJECTIVE: The study goal was to compare the laser spot size created using reflective and refractive micromanipulators with a CO2 laser and to determine the sensitivity of spot size to laser power. STUDY DESIGN AND SETTING: A CO2 laser and operating microscope (400-mm focal length) was coupled to ei...

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Bibliographic Details
Published in:Otolaryngology-head and neck surgery 2002-06, Vol.126 (6), p.593-597
Main Authors: Chao, Kenneth K. H., Cheung, Eric, Armstrong, William B., Wong, Brian J. F.
Format: Article
Language:English
Subjects:
Algorithms
Carbon Dioxide
Equipment Design
Equipment Safety
Fiber Optic Technology - instrumentation
Humans
Laser Therapy - instrumentation
Lasers - classification
Lenses
Micromanipulation
Microsurgery - instrumentation
Models, Structural
Sensitivity and Specificity
Surface Properties
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Summary:OBJECTIVE: The study goal was to compare the laser spot size created using reflective and refractive micromanipulators with a CO2 laser and to determine the sensitivity of spot size to laser power. STUDY DESIGN AND SETTING: A CO2 laser and operating microscope (400-mm focal length) was coupled to either a reflective (Cassegrain-like) or refractive micromanipulator. Laser spot size was determined by measuring the region of ablation created by laser irradiation of wood (dry tongue depressors), exposed photographic film, and agar gel using optical micrometry. Laser power varied from 0.5 to 20 W with pulse durations of 0.1 and 0.5 second. RESULTS: The reflective micromanipulator demonstrated overall smaller spot sizes for a given laser power and lower incremental change in spot size with increasing power. The reflective design demonstrated less sensitivity to increases in laser power. CONCLUSIONS: Micromanipulator optical design can result in significant differences in laser spot size. The reflective device used in this study demonstrated less sensitivity to increasing laser power.
ISSN:0194-5998
1097-6817
DOI:10.1067/mhn.2002.125298