Many experiments using atoms and lasers are performed in physics which require knowledge and modelling about the excited state of the atomic species being studied. Steady-state models can be used to get the final equilibrium of a laser-atom system but a large number of laser-atom interactions are short-lived an decay quickly. Most models using the Louiville equation to capture the dynamics of the interaction do not use a full quantum electrodynamic picture to evolve the system over time but instead use a semi-classical approach. In this simulator all dynamics are calculated by deriving the equations from field operators. This gives a more physcially accurate model.
Run the following to install:
pip install LASED
The source code can be found at https://github.com/mvpmanish/LASED.
In this simulator a user defines a State object with all quantum numbers defined. The user then creates two vectors: one containing all the ground states and one for the excited states. The user can then define a LaserAtomSystem object with a laser power (or intensity) and the laser wavelength. With this object the user can:
- Use
timeEvolutionto time evolve the laser-atom system and access the time evolution of the density matrix elements over time usingRho_t. Can simulate very simple systems such as magnesium and calcium with no hyperfine structure to atoms with hyperfine structure and a large number of states such as caesium. rotatethe laser-atom system's density matrix at t = 0, defined asrho_0to a different reference frame and then time evolve using the Euler angles- Obtain the density matrix for the excited state and ground states over all simulation time
Check out readthedocs for detailed tutorials and a guide for how to use the library: https://lased.readthedocs.io/en/latest/
Thank you to Professor Andrew Murray, Dr Matthew Harvey, and Parinya Udommai for their continued support with this library and project.
Please cite this library if you are using it.