Optical Trap Kit
19590-D04-V15; Apr 12, 2012
Page 10
www.thorlabs.com
7)
The sample stage consists of a microscope slide holder mounted to a 3-axis (X, Y, and Z)
translation stage that is mounted on a 1-axis long travel translation stage and to a translating
breadboard which results in the following capabilities:
A)
2" (50 mm) and 2.4" (60mm) of travel perpendicular to the beam path. This makes it easy
to load the sample and coarsely position it near the
trap. The mounting configuration shown can easily
be modified to suit other desired translations.
B)
4 mm of travel in the X, Y, and Z directions using the
modular nanomax differential micrometer drive with
coarse knobs providing 0.5 mm/rev.
C)
300 µm of travel in the X, Y, and Z directions using
the differential knobs (50 µm/rev) on the 3-axis
differential drives.
D)
20 µm of travel in the X, Y, and Z directions using
the piezo actuators (20 nm resolution without using
feedback from the internal strain gauge sensors, 5 nm
resolution using the internal strain gauges for positional feedback) on the 3-axis stage.
Three T-Cube Piezo Drivers (Item # TPZ001) are included in the kit. (Two T-Cube Strain
Gauge (Item # TSG001) are included with the OTKBFM force module.)
8)
The visible light emitted from the LED passes through the dichroic mirror and illuminates the
sample while the 980 nm laser beam is reflected towards the optional OTKBFM Force
Calibration Module. (If the OTKBFM is not being used, the laser is blocked by a cap, SM1CP2).
9)
A single emitter white light LED (Item # LEDWE-15,7.5
o
half angle forward radiating) is built
into the component OTKB-LS-SP. The light from the LED illuminates the sample.
10)
The OTKBFM force measurement module contains the hardware needed to calibrate the trap.
The iris at the back focal plane of the objective (used as the condenser) is imaged on the
PDQ80A Quadrant Position Detector (QPD) using a 40 mm focal length biconvex BK7 lens
(Item # LB1027-B). The detector is silicon based segmented quadrant position-sensing detector
with a rise time of 40 ns and a bandwidth of 150 kHz. The signal generated by the QPD is
sensitive to the relative displacement of the trapped particle from the laser beam axis. As a result
the output of the detector can be used to calibrate the position, stiffness, and force of the optical
trap. A TQD001 T-Cube Quadrant Detector Reader is included with this optional force module.
Summary of Contents for OTKB
Page 1: ...Optical Trap Kit Manual...
