Part IV: Optical Spectroscopy of Solids

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Presentation transcript:

Part IV: Optical Spectroscopy of Solids Atilla AYDINLI

Outline Experimental Setup Elements of Raman Spectroscopy Monochromator PMT Laser Elements of Raman Spectroscopy Introduction to Photoluminescence Spectroscopy

U1000

U1000

Slits

Reflection Grating

Transmission Grating

Grating Equation

Grating Equation

Grating Equation Littrow Configuration

Grating Equation Deviation angle Scan angle Grating equation for mounts

Sin-Drive; Cosecant-Drive

Diffraction Order

Order Overlap

Dispersion Angular Dispersion Linear Dispersion

Dispersion Reciprocal Linear Dispersion (nm/mm) 2.43 nm/mm for U1000 w/ 1800 g/mm grating

Resolving Power

Focal Length and F/#

F/# Matching Over match: Loss of signal Under match: Loss of resolving power Choose collection optics geometry to match it to the F# of the monochromator

PMT

PMT

Spectral Responsivity

PMT

Transfer Function/Throughput Polarization dependent Wavelength dependent Ideal light source? No! Use a black body at a known temp Use calibrated W lamp With known incident spectral light density measure output and calculate T. Important for PL exp not so for Raman.