The Quantum Optics Group (QOG) at the ANU specilizes in production of squeezed and entangled states of light and their use in future quantum information processing and quantum networks applications. In collaboration with the ANU College of Engineering & Computer Science, QOG is focussing on the production of quantum states at the telecommunication wavelength that will allow tests of quantum protocols directly using optics fibre networks.
The quantum states are produced by optical resonators containing a crystal via a nonlinear effect called Optical Parametric Amplification (OPA). In order to achieve OPA, one has to pump the nonlinear crystal with an optical field at twice the frequency of the signal field. For a signal at the telecommunication wavelength, this corresponds to an optical field at 775nm.
This project aims to develop a second harmonic generator operating at 775nm wavelength. In such a system, a nonlinear crystal is placed inside an optical resonator. The resonator and the crystal have to be designed with correct parameters in order to achieve maximum conversion efficiencies. The laser at 1550nm wavelength is then coupled into the cavity and brought to resonance. By optimising the phase mismatch between the fundamental and second harmonic fields, the system converts the fundamental field into its second harmonic.
Non-Physics supervisor: Dr. Jiri Janousek (CECS), Prof. Elanor Huntington (CECS)
his project is a joint project between the Department of Quantum Science (Prof Ping Koy Lam) and the ANU College of Engineering & Computer Science (Dr Jiri Janousek).
Student will develop skills in:
- Mechanical and optical design of laser cavities
- Quantum control of laser cavities
- Optical frequency conversion using nonlinear crystals
- Data analysis and interpretation