| Note: Additional photos are printed in Jeff's setup manual! |
Schematic
|
Fall 2021 setup: Glass slide (vertical), Fresnel lens (in frame);
FreeView run in admin account (jahncke_lab)
|
Laser, detector 1, beam splitter, power supply,
(old) function generator, Fresnel lens in frame |
Settings for Gw Instek function generator |
Note that BNC cable from laser now connects to the
TTL/CMOS Output terminal on the rear of the Gw Instek function generator |
Connection of new (2018) laser to power supply and
(old) function generator. Note that the BNC cable
now connects to the
TTL/CMOS Output terminal on the rear of the Gw Instek function generator |
Detail of new laser (2018) |
Connections to power supply. Stick bare connections in plastic bag
to prevent shorting against optical table |
Fresnel lens in frame, function generator, oscilloscope,
laptop, detector
2 |
FreeView on laptop:
v = {2(68 m) + 1 m}/460 ns = 2.98x108 m/s ⇒ 0.7%! |
Note that 460 ns is the sweet spot. From Fall 2021:
v = {2(68 m) + 1 m}/480 ns = 2.85x108 m/s ⇒ 5%! |
Trundle wheel stand |
Trundle wheel at rest on stand |
| Old setup photos from 2007 – still has useful details |
Assemble a 'laser shield' since laser isn't turned off between groups |
Attach a piece of 3-hole punch cardboard to a pendulum clamp |
The outer screws fit through 2 holes; reverse the middle screw so it doesn't get lost |
The laser shield in action. Leave laser turned on between groups. |
Detail of detector 1, beam splitter and laser |
Detail of laser and beam splitter |
Function generator settings: Square wave (formerly used Sine), 100K,
~20 on display;
wire from laser is connected to TTL/CMOS BNC connector |
The (old) laser connection to the function generator |
Connection of laser to ±15 v power supply |
Beam splitter detail |
Detectors 1 & 2 connected to oscilloscope |
For each connection, use a BNC T-connector, and attach a
double-banana-to-BNC adapter. Each adapter has a
10 kΩ {brown-black-orange} resistor attached. |
Detector 2 |
Switch on detector; turn off between runs to save the battery! |
Put trundle wheel under the cart |
The trundle wheel |
Drawers where the tinker toys for the bread board are stored |
Most of the bread board stuff is in "Optical Mounts" |
Box of bolts for tinker toys |
Box 'o bolts |
Tinker toys |
You'll need an Allen key to tighten bolts on bread board |
Laser focusing tool, used to tune laser appearance, if needed |
Use a power strip to connect all electrical components;
a long extension cord is need to reach the nearest outlet |
| Older setup photos from 2005 – still useful? |
Professor Jahncke ponders the setup.
Note that the bread board sits on a lab cart. |
The Fresnel lens, laser, beam splitter and detector |
Side view |
Function generator, DC power supply |
Storage scope |
The corner cube is placed at the other end
of the hallway, illuminated by laser |
The corner cube
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Illuminated by the flash!
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