文档介绍：LEOT Laser Tutorial - Course 3: Laser Technology - Module 14: Laser Safety: Hazard Evaluation
This version reflects ments of the core participants as reviewed and
incorporated in accordance with CORD's FIPSE-supported Curriculum
Morphing Project.
MODULE 3-14
LASER SAFETY:HAZARD
EVALUATION
The collimated nature of laser light creates an intense beam which
appears to emanate from a point source at some distance behind the laser
output aperture. This allows the beam to be focused by the human eye to
microscopic, retinal spot diameters. These circumstances lead to high
irradiance and create potential ocular hazards from both direct and
reflected beams.
In order to recognize potential laser hazards, it is necessary to be able to
mathematically express the various conditions which may occur in the
normal use of the beam. This module investigates the various conditions
of both direct and reflected laser light in order that the basic calculations
for hazard analysis can be plished.
In the laboratory, the student will evaluate the optical hazards presented
by laser beams under several laboratory conditions.
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LEOT Laser Tutorial - Course 3: Laser Technology - Module 14: Laser Safety: Hazard Evaluation
pletion of this module, the student should be able to:
1. Calculate the optical gain of the human eye given the diameter of a
focused beam, the average diameter of the eye pupil, and assuming that
the cornea transmits to the retina all of the power incident upon it.
2. Calculate the irradiance at the retina produced by a laser beam of
known divergence and output power, given the focal length of the eye
lens and assuming no reflection or transmission losses.
3. Calculate the irradiance that is incident upon a diffuse reflector target
from a laser of known beam divergence, power, and beam size at a