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CENTRE FOR LASER SCIENCE DEPARTMENT OF PHYSICS
The University of Queensland

 

Laser SCIENCE

The Centre for Laser Science (CFLS) undertakes fundamental research in laser science from which future technologies can emerge. It aims to also become a primary Australian Centre for undergraduate and post-graduate training in laser science. The Centre was established at the Department of Physics, The University of Queensland in 1997. The priority research programs are laser physics, quantum optical systems and future optical technology. The Centre is funded through a variety of sources including the Centre for Quantum Computer Technology. The Director of the Centre is Professor H. Rubinsztein-Dunlop, from the Department of Physics and the Deputy Director is Professor G. Milburn, from the Department of Physics, and who is also the Deputy Director of Special Research Centre for Quantum Computer Technology.

For full details of all research programs, list of researchers and facilities at the Centre for Laser Science, click on the link above to the CFLS home page.

CFLS is currently the largest quantum optics-laser physics group in Australia and a significant world centre. The combination of complementarity experimental and theoretical programs is a special feature of our group. The current areas of research are quantum optics, non-linear laser spectroscopy, optical tweezers and laser micromanipulation, atom optics and atom cooling, quantum chaos, quantum device modelling, mesoscopic systems.

The Centre has five laboratories equipped with a number of CW and pulsed laser systems. CW systems include Ar ion lasers, CW NdYAG lasers, a number of external cavity semiconductor diode lasers as well as a high power diode laser. Pulsed lasers include systems operating in nano-, pico- and femto-second regimes such as NdYAG pumped dye laser systems, modelocked NdYAG system and femtosecond modelocked TiS system, covering the wavelength from the near infrared to ultraviolet.

Detection systems include imaging spectrometers, cooled CCD cameras and high efficiency single photon detectors. The facilities also include confocal and multiphoton microscope, near field option and cryogenic microscope stage. In a near future regenerative amplifier and optical parametric amplifier system will also be available enabling pump/probe experiments to be conducted.

The most recent experiments on PbS quantum dots were performed using two-photon imaging involving excitation Miro-laser excitation source directed to a confocal microscope.

 

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Figure 1. Confocal fluorescence microscope used with the Mira 900 femtosecond laser for two-photon fluorescence imaging.

 

 

 

Figure 2. Coherent Mira 900 tunable modelocked Ti:Sapphire laser used for two-photon imaging.

 

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Figure 3. Two-photon fluorescence scan of the PbS film thickness, showing the depth resolution of the two-photon imaging technique. Image obtained using the system shown above.

 

 

Figure 4. Two-photon fluorescence image of activated PbS quantum dots in a thin PVA film. Image obtained using the system shown above.

 

 


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