4th semester lab class for electrical engineering students (Summer Semesters)

Description: The fourth semester lab class gives undergraduate students to implement a complete project under the guidance of scientific staff of the Integrated Photonics Laboratory.

In the following we are giving some examples of past projects:

1- Analog/Digital visible optical link (Summer 2013)

The goal is to modulate a 635nm visible beam emitted from a laser diode into a transmission medium (free space and/or optical fiber). The signal sources are analog (e.g., an audio signal) or digital (transferring a data file from one computer to another). The project would involve designing the free space to fiber coupling using optical elements (lenses, collimators, etc.), designing the electronics for modulating the laser diode, processing the signal from a detector (either free space or fiber based), and interfacing to the PC.

2- Michelson interferometer for coherence measurement and FTIR spectroscopy (Summer 2013)

The goal will be to build a computer controlled Michelson interferometer and to measure the coherence of various light sources. This would also enable the system to be used as an FTIR (Fourier Transform InfraRed) spectrometer. Using the system a variety of spectra, such as the absorption spectrum of semiconductors will be measured. The project will involve optical design and assembly of a Michelson interferometer, writing computer code to control the movable arm of the interferometer and to acquire data from the detector. In addition a suitable user-friendly interface will be developed.

3- Grating based monochromator/spectrograph (Summer 2013)

The goal is to build a computer-controlled grating based monochromator and to operate it in single detector (monochromator) and detector array (spectrograph) mode. The grating is mounted on a computer controlled rotation stage. By scanning the grating angle the detector(array) will measure the power at different wavelengths thereby enabling the characterization of the entire spectrum. The project will involve optical design and assembly of a 4-f imaging system with a grating as a dispersive element (Czerny-Turner configuration). On the software side computer code should be written to control the angle of the grating and to acquire data from the detector or detector array. In addition a suitable user-friendly interface will be developed.

4- Computer controlled laser direct-write system (Summer 2013)

In this project a computer controlled system for writing arbitrary patterns in photoresist will be developed. A silicon substrate coated with photoresist will be loaded onto a computer controlled XYZ stage. A blue laser diode will be focused on the surface of the chip. The chip will be moved according to a prescribed pattern dictated by the computer. After the entire pattern is written the photoresist will be developed to create the patterns. The system will be used to fabricate a variety of photonic components such as waveguides and diffractive optical elements. The project will involve optical design and assembly of the blue laser diode collimation and focusing section, assembly of the XYZ stage and writing code to move it according to a prescribed pattern. In addition a suitable user-friendly interface will be developed.