Examples of Investigation and Measurement

Snellius law
A collimated laser beam is refracted on a transparent half round disc which can be rotated with respect to the optical axis. This experimental set-up allows measuring the deflection of the beam as a function of the angle of incidence. The Snellius law is verified by the transition of light from air to a dense medium and vice versa.

Refraction on plates
When a beam passes through a transparent plate the outcoming beam does not show deflection but is parallel shifted in relation to the original beam. This offset of the beam can be measured as a function of the angle of incidence.

Total reflection / Optical fibres
Light entering a transparent plate from askance is multiple reflected throughout the whole plate. The light propagation in optical fibres is based on this principle of total reflection. The model of an optical fibre demonstrates how light is caught in a narrow fibre by total internal reflection.

Rainbow
A transparent cylinder is used for a two dimensional model of a raindrop. A laser beam is refracted and reflected in the same way as the sun rays are affected by the raindrops to generate a rainbow.

OXP-01 Required Equipment
1 1	02.0200 02.0300	Profile rail OCM 650, 200 mm Profile rail OCM 650, 300 mm The high precision optical rails are made out of special anodized aluminum. The rails are the base for various modules attached to carriers.
1	02.2126	Mounting plate OCM 650 for click 25, including carrier 20 mm Mounting plates are used to hold optical mounts. A characteristic feature of the mounting plates is the “click” mechanism of the inserts based on spring loaded spheres. Snapping in the groove of the inserted click mount, the optical element is kept in an exact position. On the other hand, the system allows a quick and easy change of the mounted inserts. The mounting plates are made out of special anodized aluminum. Mounted onto the carrier 20 mm, the mounting plates can be placed onto an optical rail.
1	02.2526	Target screen, in 25 mm click mount To align a light beam coaxial to the centre axis of the rail setup, this target of 20 mm diameter is used as visual aid. It is mounted onto a click mount 25 mm by two threaded mounting rings. The click mount can be fixed onto a mounting plate (02.2126).
1	02.6106	4 axis adjustment holder KH650, theta, phi, X and Y, including carrier 20 mm This adjustment holder mounts a Diode Laser or an LED lamp. Using the fine pitch adjustment screws, the optical axis can be aligned within the range of 3 mm. For fine alignment of the angle of the light beam, two additional pitch adjustment screws are attached onto the back of the holder. The holder and the carrier 20 mm are made out of special anodized aluminum and can be placed onto an optical rail.
1	05.0226	DIMO diode laser module, 532 nm (green) Due to its collimated beam, this frequency doubled green YAG laser is an ideal light source for experiments dealing with ray tracing and beam propagation. The diode in its 40 mm x 25 mm diameter housing tube made out of special anodized aluminum can be fixed onto a four axis adjustment holder and can be aligned to the optical axis. Driven by the LDD-05 active power supply (07.0206), the output power is controlled in the range from 0 to 3 mW.
1	07.0206	LDD-05 active power supply The universal LDD-05 active power supply is used for all laser and LED light sources. It recognizes which source is connected and sets the parameters for it automatically. The unit is equipped with a main switch, a regulation knob for adjusting the laser or LED power and a safety lock. The provided USB bus interface allows control through a personal computer or laptop and qualifies this unit as multimedia source. The housing is made out of shock-proof plastic with an aluminum front and rear panel. Voltage: 230 VAC / 50 Hz Case dimensions: 200 mm x 160 mm x 62 mm.
1	09.1102	Plate assembly A hinged joint angle connector holds various optical plates to demonstrate the diffraction of light. The unit can be mounted onto two optical rails which can be set in a defined angle to each other. By adjusting the hinge angle, the beam deviation angle can be measured on a scale from -90 - +90° at intervals of 2°. For beam tracing within the elements, the optical plates are made out of fluorescent material. The set of plates mounted onto an aluminum holder consists of: 1 semi-circle acrylic disc 50 mm diam x 20 mm 1 thick acrylic slab 40 mm x 20 mm x 20 mm 1 thin acrylic slab 50 mm x 20 mm x 3 mm 1 acrylic cylinder 25 mm diam x 20 mm The metal parts are made out of special anodized aluminum.
1	09.1104	Optical fibre model A 300 mm plastic fibre is mounted onto a rod onto a carrier. It demonstrates light propagation in a fibre and the attitude of a fibre towards influences like surface damages and sharp bends. The unit is made out of special anodized aluminum. Mounted onto the carrier 20 mm, the module can be placed onto an optical rail.