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

Otolaryngology - Head and Neck Surgery - Tập 126 - Trang 593-597 - 2002
Kenneth K.H. Chao1, Eric Cheung1, William B. Armstrong1, Brian J.F. Wong1
1From the School of Medicine, University of Texas Health Science Center at San Antonio (Mr Chao), Beckman Laser Institute, University of California Irvine (Dr Wong and Messrs Chao and Cheung), Department of Otolaryngology-Head and Neck Surgery, University of California Irvine (Drs Armstrong and Wong), Long Beach VA Medical Center, Long Beach (Drs Armstrong and Wong), and The Whitaker Center for Biomedical Engineering, Samueli School of Engineering, University of California Irvine (Dr Wong).

Tóm tắt

OBJECTIVEThe 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 SETTINGA 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.RESULTSThe 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.CONCLUSIONSMicromanipulator 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.

Tài liệu tham khảo

10.1002/lsm.1900170110 10.1177/019459989110500310 10.1177/019459988809800216 10.3171/jns.1983.59.6.1098 Born M, 1986, Principles of optics: electromagnetic theory of propagation, interference, and diffraction of light, 246 10.1177/014556139907800415 10.1002/lsm.1900080204
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Otolaryngology - Head and Neck Surgery

Tập 126

593-597

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