Some details on the CW diode laser (fibre coupled) that we plan to use for the interferometer.
This laser could also be used as an IR alignment laser for FACET S20 in general.
Model: I0785SL0050PA-USB
Central wavelength 785nm +- 0.5nm.
Class 3B
The laser has a closed loop interlock (RJ-11 port).
Fiber coupled collimator.
Implementation at S20
Laser enclosure as at B40, with shutter.
Collimator details here.
Co-injected with main laser.
Divergence needs to be adjusted to match main laser (find good procedure to do this).
Appendix: Laser enclosure (Rm209@B40)
To activate the laser one has to push a button on the front panel.
This means one cannot enclose the full laser, but only shutter with the fiber termination.
Some lens tube is used to restrict access to the fiber connectors and to protect the fiber from mechanical damage.
