J.A. Woollam M-2000, Hardware Manual

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18 ©2023 J.A. Woollam Co. M-2000® Hardware Manual
M-2000V(I) ellipsometers use the FQTH-100 Source Unit. The FQTH-100 Light
Source houses a 50W QTH (Quartz Tungsten Halogen) lamp. The Source Unit
also contains the beam collimation optics, a fixed polarizer, and a compensator
located in a continuously rotating stepper motor.
50 watt QTH Lamp
Figure 2-9. Typical QTH lamp.
The QTH (Quartz Tungsten Halogen) lamp is mounted just behind the pinhole in
the rear of the lamp housing.
Warning: The QTH lamp gets extremely hot during operation. Always allow it
to cool adequately before replacing the lamp.
Receiver Units
The following receiver units are used for M-2000 ellipsometers. There is also an
optional Internal Alignment Camera used for fast sample alignment.
MQD-Single Receiver Unit
Figure 2-10. MQD Single Receiver Unit.
The MQD Single Receiver Unit is used on the M-2000D, U, X, and V systems. It
consists of a stepper motor driven rotational stage which houses an analyzer.
There is also a four-quadrant detector used for alignment of the system. This
receiver contains one beam folding mirror and one fiber coupling lens (UV-VIS).