Continuum Surelite EX 10, Operation And Maintenance Manual

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Section 4: Subassembly and Module Descriptions
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C
AVITY OPEN
The beam propagating within the oscillator cavity makes a double pass through the
Pockels cell and
λ
/4 plate. At 3600 volts on the PC it adds 45° rotation and the
λ
/4
plate adds 45° with each pass, giving a total rotation of 180°. Thus, the horizontal beam
that transmitted through the plate polarizer is rotated to vertical and back to horizontal,
so that it is transmitted by the polarizer allowing oscillation to occur.
Figure 34 Cavity open and lasing
Harmonic generators
The Surelite series can generate laser light at the Nd:YAG fundamental wavelength (1,064 nm) or its
second, third or fourth harmonic (532, 355, 266 nm). This is achieved by passing the fundamental
beam through a second (SLD), a second plus third (SLT), or a second and fourth (SLF) harmonic
generator.
These optional harmonic generators are positioned at the end of the laser bench, and can be
optimized with adjustment knobs located on the top (for the SLD) and on the right (for the
SLT/SLF).
Figure 35 Extra Harmonic Generator