Laser environment

The diode lasers and the associated devices will be located in the polarized $^3$He target laser hut in Hall A. The entire hut is a laser controlled area. Its organization is shown in figure 2. The setup will be on the second floor and the direct laser light will not be visible from the entrance of the room.

Figure: The Polarized $^3$He Target Laser Hut Setup

The laser beams are horizontal and are pointing away from the entrance door. After passing through the optical setup, the laser beams are directed into the pumping cell and terminated there.

Outside the laser hut, the laser beam path is completely enclosed with beam pipe between the laser hut and the target pivot and an enclosure on top of the the target. Since the beam path is not enclosed inside the laser hut, any partially reflective surface may cause deflection of the beam path. When operating the diode laser, safety goggles are required at all times.

Apart from direct beam hazards to eyes and skin, since the diode lasers are Class IV lasers, there exists a potential fire hazard. Flammable material should not be brought into the laser area.