GSI Group - Laser Division
JK300HP/JK300P/JK125P
Issue 2.0
Pre-installation and User Manual
Part No: 1EA300E01
Page
25 of 172
2.2 Laser Radiation Hazards
The JK300HP/JK300P/JK125P Series Laser is a Nd: YAG Laser. This Laser produces
radiation with a 1064nm wavelength, powerful enough to melt and vaporise most materials.
Even diffuse reflections can inflict serious injury if allowed to strike the body.
Effects on Body Tissue
Laser radiation is concentrated energy. If it strikes the body, most of the energy will be
transferred to body tissue. Tissues will show burn damage that will spread depending on the
irradiated area and duration of exposure.
High power exposure may cause the absorbing body tissue to explode and vaporise.
Displacement of absorbing tissue may result in shear damage to adjacent tissue.
Effects on the Eye
Nd: YAG light presents a hazard to the eye because the light can damage retinal tissue.
Exposure to moderate levels of Laser light can cause burns, which may be permanent. Nd:
YAG light is invisible and personnel will be unaware of the risk of exposure.
Indirect Exposure
Control measures reduce the risk of direct beam exposure. However, there is also a risk of
indirect exposure to radiation re-directed by components located in the beam path.
Reflective components present the greatest risk, since virtually 100% of the beam power can
be redirected. The level of risk depends on the direction of the reflected beam relative to the
personnel. A Class 4(IV) Laser beam can be reflected from non-reflective surfaces.
Exposure can be minimised by tilting of components in the beam path and/or appropriate
positioning of personnel with respect to the reflected radiation.
The risk of indirect exposure can be minimised by the following precautions:
•
Ensure no unintended/unnecessary components are in the Laser beam path.
•
Ensure all optical components in the beam path are maintained in good condition
(clean and undamaged).
•
Ensure all necessary components in the beam path re-direct the lowest possible
amount of light.
•
Ensure all components in the beam path are securely mounted to avoid unexpected
changes in component position/tilt.
•
Ensure that components and personnel are positioned to reduce exposure of
personnel to re-directed radiation.
2.3 Control
Measures
The risk of personal injury can be minimised by the following measures:
•
Never direct the Laser beam at other people.
•
Never direct the Laser beam upwards. If possible, direct the Laser beam down towards
the floor.
•
Avoid mounting the Laser or any part of the beam path at eye level. If possible always
arrange horizontal beam paths well above or below eye level.
•
Always use a Beam Stop behind the target/work piece.
Precautions must be taken to prevent unauthorised personnel from entering the equipment
work area when the Laser is operating.
Petitioners Canadian Solar Inc. and Canadian Solar (USA) Inc.
Ex. 1025, p. 25
