Lasermet LS-200 Instruction Manual page 9

LS-200 Instruction Manual
It is also possible to locate a laser power meter in place of the beam dump so that the laser power
can be determined while the shutter is closed. In this arrangement it is essential that the power
meter head damage threshold is sufficient to withstand the laser beam for the length of time for
which the laser may be active with the shutter closed.
Consideration should be given to the type of blade fitted, see below.
Note that the unit is primarily intended as a safety shutter rather than a precision beam diverter or
timing shutter. Due to the free moving nature of the blade the exact exit angle of the beam through
the beam dump aperture is slightly variable, therefore any external apparatus must be mounted as
close as possible to the shutter, it must have an aperture the same size or bigger than the port and
be able to accept small variations in beam position and angle.
Blade Type
The standard LS-200 has an angled bare stainless-steel blade with a non-precision surface which
deflects and to some extent scatters the beam. This surface is generally suitable for most
applications. To prevent permanent damage and invalidation of warranty it is essential that the
power density of the laser is insufficient to ablate the blade.
It is possible to order the LS-200 with other blade materials which may be more appropriate for
more powerful lasers.
The ceramic blade option is recommended for Q-switched lasers where the standard stainless-steel
blade may become ablated.
There are a number of mirror blade options featuring front silvered or dielectric mirrors for various
wavelengths. These allow the shutter to be used with higher power lasers than the standard blade.
The mirror blade option is also advisable when mounting a laser power meter at the beam dump
port.
For SIL3 shutters the laser beam will normally be directed out of the beam dump port nearest the
laser, however consideration should be given to the consequences if the first shutter fails to close
and the beam is directed to the second shutter beam dump port.
Observe the warnings given in the next section, 'Using with Powerful Lasers'.
01297-53-000 Issue 4 19 January 2021
Page 9 of 17