Examples of Investigation and Measurement

Dielectric mirror / Anti-reflection coating
With a white light source the functionality of a dielectric mirror is demonstrated. An optical grating allows resolving the transmitted and reflected light spectrally. In the same way the working principle of an anti-reflection coated glass plate is presented.

Reflection law
The investigation starts by verifying the reflection law. The deflection of a laser beam reflected by a metal coated mirror is measured as a function of the incident beam angle. Additionally, the polarization dependence can be tested by an analyzer.

Fresnel Laws
The mirror is exchanged by a transparent half-disc and the incident beam is polarized. For a verification of the Fresnel Laws the intensity of the reflected and transmitted light and its state of polarization is important. Therefore a photo detector and a polarization analyzer are provided.

OXP-04 Required Equipment
1	02.0300	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.
3	02.2132	Mounting plate OCM 650 for click 30, 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	02.6106	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	04.0060	Plano convex lens f=40, mounted in click 30 mount Different glass lenses are mounted onto a special anodized aluminum click mount 25 mm by two threaded mounting rings to be used in connection with a mounting plate (02.2126).
1	05.0030	LED white in housing As universal and easy-to-change light sources, LED lamps are used in optical experiments. The LEDs are mounted onto a 40 mm x 25 mm diameter housing tube made out of special anodized aluminum. For the alignment, the lamps can be fixed onto a four axis adjustment holder mounted onto a carrier. For their operation, the active LDD-05 power supply (07.0206) is required which controls the output power. For the lamps 1 W (white LED: 3W), high brightness LEDs are used.
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	09.0044	Module polarisation analyser with mounting plate and rotation assembly In this unit, the high quality polarizer foil is inserted into a rotatable holder mounted onto a carrier. Using the rotating insert, the polarization direction can be set in degrees (0 - 360°) with a resolution of 2°. The unit is made out of special anodized aluminum. Mounted onto the carrier 20mm, it can be directly attached to the optical rails.
1	09.1410	Reflection assembly Using this unit, the optical objects (mirror, glass plate and dichroic plate) can be rotated around its axis while the pivot arm is set to the deflected beam. By adjusting the hinge angle, the beam deviation angle can be measured on a scale from -90 - +90° at intervals of 2°. Depending on the arm mounts, properties like intensity, spectra or polarization state are determined. The set of plates mounted onto an aluminum holder consists of: 1 front-surface plane mirror 30 mm x 20 mm x 2 mm 1 anti-reflection coated BK7 glass plate 30 mm x 20 mm x 6 mm 1 dichroic mirror 20 mm x 15 mm x 2 mm The metal parts are made out of special anodized aluminum.
1	09.1430	Set of mounts on arm for reflection This set consists of one analyzer, one focusing lens, one grating, one screen and a mini-photodetector. They can be put onto the rotatable pivot arm using adjustment pins. The specifications of the mounts are: 1 High quality polarization analyzer foil mounted onto a click mount 25 mm fixed onto a rotator with a scale graduation from 0 - 360° at intervals of 5°. 1 Plano convex lens f = 40 mm, diam = 22,4 mm mounted onto a click mount 25 mm fixed in a special anodized aluminum holder. 1 Optical grating 600 l/mm mounted onto a special anodized aluminum holder, 50 mm x 50 mm x 2,5 mm . 1 Screen made out of special anodized aluminum plate with one side painted white, 40 mm x 40 mm . 1 Mini Si PIN photodetector with connection lead mounted onto a special anodized aluminum holder.
1	19.0400	Digital multimeter 3 ½ digits he digital multimeter is used for relative intensity measurements of light beams. It has to be connected to a photodetector via banana adapter connection leads. Specifications:
		Display LCD, 3 ½ digits
		AC voltage ranges	2 / 20 / 200 / 750 V
		Frequency range	40 - 400 Hz
		DC voltage ranges	0,2 / 2 / 20 / 200 / 1000 V
		AC current ranges	2 / 20 / 200 mA / 20 A
		Frequency range	40 - 400 Hz
		DC current ranges	0,2 / 2 / 20 / 200 mA / 20 A
		Resistance ranges	0,2 / 2 / 20k / 0,2 / 2 / 20 MΩ.