NKT Photonics Koheras ADJUSTIK HP, Product Manual

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Optical specifications
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always be placed on the External bus connector to loop back the interlock
safety circuit – see
“Connecting the safety interlock” on page 91
.
Figure 4 ADJUSTIK rear panel layout
Note: The pin assignments of the rear panel connectors are described in
Appendix C
Optical specifications
Main optical output
ADJUSTIK lasers are classified as either laser CLASS 3B and ADJUSTIK HP lasers as
CLASS 4. The main optical output can be identified by the laser aperture label placed
next to it. See
“Chassis labels” on page 34
.
Monitor Output
The monitor output is classified as a laser CLASS 1 output and does not require a
laser aperture label.
Laser features
Thermal tuning
The wavelength of the laser can be controlled using a thermal tuning technique that
changes the temperature of the laser’s fiber. The fiber laser is mounted under tension
on a substrate. When the temperature of the substrate changes, the laser cavity
length also changes due to thermal contraction or expansion. Further, the
temperature of the laser cavity itself also changes such that the laser wavelength
changes in response to both thermo-optic and physical changes in the optical path
length. See
“Tuning the wavelength” on page 82
.
Fast wavelength
modulation
The laser includes the capability to modulate the emission wavelength using a Piezo
which is termed fast wavelength modulation . The modulation signal applied to the
Piezo is selectable from either the laser’s internal generator or an external electrical
signal.
1 AC mains inlet 4 10/100 BASE-T Ethernet port
2 LEMO door interlock connector 5 External bus
3 Modulation (input and output) 6 Cooling fins
1 2 3 4 5 6