1. Acousto-Optic Filters McCreery, R. L., Raman Spectroscopy for Chemical Analysis, 3rd ed., Wiley, New York: 2000 Wavelength tuning over entire Raman shift range. Wavelength tuning over entire Raman shift range. TeO 2 crystal is excited acoustically with ultrasonic generator. => Standing wave pattern acts as diffraction grating. TeO 2 crystal is excited acoustically with ultrasonic generator. => Standing wave pattern acts as diffraction grating. Spectrum is scanned by changing ultrasonic frequency in less than 1 s over 0 to 3500 cm -1 shift range. Spectrum is scanned by changing ultrasonic frequency in less than 1 s over 0 to 3500 cm -1 shift range.

2. Acousto-optic Tunable Filter http://www.olympusfluoview.com/theory/aotfintro.html

3. Confocal Microscopy Optics McCreery, R. L., Raman Spectroscopy for Chemical Analysis, 3rd ed., Wiley, New York: 2000

4. Confocal Aperture and Field Depth McCreery, R. L., Raman Spectroscopy for Chemical Analysis, 3rd ed., Wiley, New York: 2000 a nd McCreery, R. L., Raman Spectroscopy for Chemical Analysis, 3rd ed., Wiley, New York: 2000 a nd http://www.olympusfluoview.com/theory/confocalintro.html

5. Confocal Aperture and Field Depth McCreery, R. L., Raman Spectroscopy for Chemical Analysis, 3rd ed., Wiley, New York: 2000