Development and realization of a Raman laser system
Chapter 1 gives a brief introduction of the physical phenomena that motivates the buiding of Raman laser system. Chapter 2 explains the physics of how laser can be used to cool down an ensemble of atoms. The ensemble of cooled atoms are then trapped by setting up the magneto-optical trap. C...
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| Format: | Final Year Project |
| Language: | English |
| Published: |
2009
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/18608 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Chapter 1 gives a brief introduction of the physical phenomena that motivates the buiding
of Raman laser system. Chapter 2 explains the physics of how laser can be used to cool
down an ensemble of atoms. The ensemble of cooled atoms are then trapped by setting
up the magneto-optical trap. Chapter 3 will give a mathematical description of two level
system under the perturbation of a radiation field. A useful geometrical picture can be
derived by writing the dipole moment with new algebraic terms. The Bloch vector derived
from there can be used to represent the dynamic nature of the two level system under
radiation field on a Bloch sphere. Chapter 3 describes about two level system but there
are more interesting properties to be found for three level system. Chapter 4 will use one
example of three level system - lambda system and derives a set of mathematical equations
called Bloch equation to describe its interaction with radiation field. A phenomenon
of quantum interference is observed when the frequency difference between two lasers
interacting with an ensemble of atoms are equal to the energy separation of the two
ground states. Electromangetically induced transparency (EIT) and coherent population
trapping (CPT) are explained and steady state solutions are also plotted. Chapter 5 is
the experimental realisation of Raman laser system. It is divided into two sections with
chapter 5.1 mentions about the optical setup with the use of two diode laser. The laser
beams from the two diode lasers are superposed to create a beat frequency of 6.84 GHz.
Chapter 5.2 states about the electronic implementation phase locked loop to the optical
setup so that the 6.84 GHz beat frequency is stable and phase locked. Chapter 6 states
about the proposals of the Raman laser system into an experimentation. |
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