optics

Optical Activity of Sucrose Solution

Student Manual

In this think along activity we will rotate the plane of polarization of light using optically active medium. What are the basic properties of optically active medium and why are they important? Here is a brief overview of these materials.

Sample Results Inverse of resistance vs. polarization angle
Resistance vs. polarization angle
Experiment Code 1.22A
Version August 28, 2018

Further Readings and References

No references found

Pictorial Procedure

By Azeem Iqbal | Lab One Tasks
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Track spacing on a DVD

Student Manual

In this experiment, you will observe colored stripes on the surface of DVD under white illumination. Explain this phenomenon and estimate the spacing between the grooves on the DVD surface. Check out the manual.

Experiment Code 3.8A
Version 2018-v1

Further Readings and References


Pictorial Procedure

 

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Diffraction from one dimensional grating

Student Manual

Experiment 3.2 introduced diffraction patterns for single slit arrangements. This exercise will show you diffraction patterns for a one-dimensional transmission diffraction grating. This experiment will help you understand the reciprocal relationship between the shape of the diffraction pattern and that of the grating that creates it.

Sample Results Diffraction pattern image with low exposure time
Diffraction pattern image with high exposure time
Intensity Profile
Hardware Manual User manuals for Thorlabs CCD cameras.
Basic Intensity Quantification with ImageJ
Visible Transmission Grating AutoCAD Drawing
Experiment Code 3.8
Version Version 2; August 29, 2018

Further Readings and References


Pictorial Procedure

By Azeem Iqbal | Optics . Optics Lab
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Light is a transverse wave

Student Manual

This experiment deals with the nature of light, though we stick to a strictly classical description. Light is a wave in which an electric eld propagates in vacuum or inside a medium. A magnetic eld rides along. This experiment shows that the electric eld is oriented perpendicular to the direction of propagation of light. Such as wave is called a transverse wave”. We will use a laser, a pair of polarizers and a light dependent resistors to probe this phenomenon.

Experiment Code 1.22
Version Version: 2018-v1

Further Readings and References

No references found

Pictorial Procedure

By Azeem Iqbal | Lab 1 . Optics Lab
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Polarization Peanuts with Fourier Analysis

Student Manual

In many optical experiments, it is extremely important to accurately determine the polarization state of light. The complete polarization state of light can be described in terms of the Stokes parameters, which are related to the polarization ellipse. This experiment is one of the simplest schemes of determining the Stokes parameters.

Sample Results Intensity vs. polarization angle
Polar plot for elliptical polarization
Experiment Code 3.7
Version Version 1; July 19, 2018

Further Readings and References


Pictorial Procedure

By Azeem Iqbal | Optics Lab
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Mach-Zehnder Interferometry and Erasure of ‘Which-path’ Information

Student Manual

One of the most astounding and bewildering depictions of quantum mechanics is the single- particle interference experiment. If a source that emits only one particle (such as photons or electrons) at a time, is used in a classic double slit experiment, an interference patterns will emerge. This pattern is built up over multiple passes of identical particles. Interestingly, the pattern could be switched on and off even after light has emerged from the interferometer.

The Mach-Zehnder interferometer is a useful device for exploiting the wave nature of light and observing various aspects of interference. The goal of this experiment is to familiarize students with this kind of an interferometer. We will observe interference of light, and see conditions under which interference can be washed out, and ultimately recovered.

Sample Results Erasure and recovery of which-path information inside a Mach-Zehnder interferometer
Variation of intensity pattern with the post-interferometer polarizer
Variation of optical intensity with the relative angle between the polarizers placed inside the arms of the interferometer
Fringes change their visibility as polarizers between the arms of the interferometer change their relative angles
Experiment Code 2.21
Version 2018-v1

Further Readings and References


Pictorial Procedure

IMG_2499 (Medium)IMG_2501 (Medium)

IMG_2502 (Medium)IMG_2503 (Medium)

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Determining the Planck’s constant

Omair1An interesting use of the ubiquitous light bulb is its utility in determining a fundamental constant of quantum mechanics – namely the Planck constant. The purpose of Omair qazi’s experiment was to measure Planck’s constant through the observation of black body radiation. Spectral analysis of the light was carried out verifying Planck’s radiation laws, all using filtered light from a bulb, a spectrometer and photodetectors.

By Azeem Iqbal | Research Stories
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