Optical Spectroscopy

Optical spectroscopy of solids group in Institut Pascal, we are studying the light-matter interaction in semiconductors and materials for optics.

Specific studies of optical properties of solids materials.

Laser sources

• Femtoseconde laser with tunable wavelength [233, 333], [350, 500] et [700, 1000] nm, the pulse duration is 150 fs with a repetition rate of 76 MHz.
• Laser the fourth harmonic of YAG 266 nm cw
• Laser helium-cadium (HeCd) 325 nm cw
• Laser qswitch the fourth harmonic of YAG (266 nm), pulse duration : 400 ps with a repetition rate of 21 kHz

Cryostation Montana
The cryostation (Montana) is a closed cycle optical cryostat which could performed measurements from 4 to 300 K. The sample sizes could varies from few millimeter to 2 cm. Two nanopositionners allow translation of 6 mm horizontally and 12 mm vertically with a minimal step of few ten nanometers.

Detection

• A CCD camera working in the 200-800 nm range is coupled with a 1 m focal monochromator with a spectral resolution of 30 pm.
• A germanium detector working at the nitrogen temperature in the 1000-1500 nm range is coupled to a 64 cm focal monochromator.
• A streak camera could performed temporal measurements from 1 ps to 1 ms.

• Optical characterization of the OPGC LIDAR through transmission measurements to calibrate the setup and then to optimize the atmospheric observations.

_{P. Freville et al. Sensors 15, 3041 (2015)}

• Angular resolved emission studies of phosphor (ICCF) to enhance the light extraction of white light emitting diode.

_{J. Nyalosaso et al. soumis a Advanced Optical Materials}

• Reflectivity measurements of anti-coating layers deposed on silicuon substrate (ICCF) for photovoltaic applications.

 

_{A. Farhaoui et al. J. Phys. D: Appl. Phys. 50, 015306 (2017)}