Temperature controlled laser Diode driver for atom Interferometer

Jain, Richa (2014) Temperature controlled laser Diode driver for atom Interferometer. Masters thesis, Manipal Institute of Technology, Manipal.

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Stabilized diode laser are well established tools for many scientific and industrial applications. Spectroscopy, atom/ion trapping and cooling, Bose Einstein condensate, interferometry, Raman spectroscopy & microscopy are all based upon lasers. Laser diode is a laser where the medium is a semiconductor, formed by a P-N junction. Laser diodes have long operating lifetime of the order of tens of thousands of hours, provided they are handled with care and operated with proper driver circuits. The most basic requirement for a laser diode driver is supplying current. It is from 100 to 230 mA. In this project focus is on design of the temperature controlled laser diode driver for atom interferometer. A semiconductor laser performance is related with a threshold density of driving current or threshold current. Increasing temperature decreases the features of laser diode. The operating characteristics of laser diodes vary considerably with temperature. Emission wavelength, threshold current and operating lifetime all are strong functions of device temperature In laser diode thermoelectric cooler is used for precision temperature control to improve diode output levels and maintain wavelength integrity. Thermoelectric coolers (TEC) are solid state heat pumps used in applications where temperature stabilization, temperature cycling, or cooling below ambient are required Temperature control is an important and critical task. The laser temperature needs to be kept at a constant value so that the laser power is stable and noise is minimized. The objective is to design a temperature controller for laser diode driver using MULTISIM software. This software is an industry standard, best in class SPICE simulation environment.

Item Type: Thesis (Masters)
Subjects: Engineering > MIT Manipal > Instrumentation and Control
Depositing User: MIT Library
Date Deposited: 13 Nov 2014 10:52
Last Modified: 13 Nov 2014 10:52
URI: http://eprints.manipal.edu/id/eprint/141068

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