Laser Spectroscopy Podcast
Lecture recordings from Physics 268 at San Jose State University. 75 minute enhanced audio epsiodes will be added on Monday and Wednesday nights throughout Fall of 2009.
Episodes
November 30, 2009 • 71 mins
We look at sources of laser frequency noise and discuss feedback techniques using a reference cavity or a molecular transition to stabilize the laser frequency.
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November 18, 2009 • 63 mins
We look at pump probe methods using ultrafast pulses for high temporal resolution experiments.
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November 16, 2009 • 76 mins
We look at transient effects in laser gain material, -switching and mode locking as methods to get short pulses.
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November 9, 2009 • 75 mins
Podcsat from 2008 of lecture on Raman spectroscopy. This is in place of the 11/9 lecture given about Raman spectroscopy, for which the audio didn't record properly.
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November 9, 2009 • 75 mins
Podcsat from 2008 of lecture on stimulated Raman scattering. This content was not covered in class this semester. This is for your interest only and will not be covered on exams.
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November 4, 2009 • 77 mins
We look at how saturation causes hole burning in a spectral line, and measurement techniques such as lamb-dip spectroscopy and intermodulated fluorescence that can take advantage of this for doppler-free measurements.
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October 28, 2009 • 73 mins
We look at basic methods of emission spectroscopy including laser induced fluorescence, resonant enhanced multi-photon emission (REMPI), intermodulated fluorescence and stimulated emission pumping.
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October 26, 2009 • 77 mins
WE look at basic techniques of absorption spectroscopy including direct detection, frequency modulation, intracavity absorption and cavity ringdown spectroscopy.
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October 21, 2009 • 75 mins
We look at how the natural lifetime of an energy level produces a Lorentzian line profile and how the natural linewidth can be broadened by Doppler broadening, pressure broadening, transit time broadening and saturation broadening.
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October 12, 2009 • 75 mins
We look at how interferometers can be used to measure wanelength.
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October 7, 2009 • 79 mins
We look at the principles of operation of prism spectrometers and grating spectrometers and discuss operating characteristics (speed, resolving power, spectral transmission and free spectral range).
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October 5, 2009 • 80 mins
We consider the advantages and disadvantages of three classes of photodetectors: photodiodes, photomultiplier tubes and thermal detectors.
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September 28, 2009 • 74 mins
We look at several examples of tunable lasers and discuss nonlinear optics as a mechanism to increase the region of the spectrum available from laser sources.
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September 23, 2009 • 78 mins
We look at 3-level and 4-level gain systems in laser amplifiers, discuss optical cavities and tuning elements of laser oscillators.
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September 23, 2009 • 62 mins
We look at an example of calculating the bond length and bond strength of HCl from a measured mid IR absorption spectrum.
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September 23, 2009 • 80 mins
We look at energy levels associated with rotation and vibration of molecular bonds
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September 14, 2009 • 75 mins
We look at the Bohr model of the atom and see how it can be used to explain the line spectrum of Hydrogen, and then generalize to other atoms.
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September 9, 2009 • 71 mins
We look at an application of our previous quantum treatment of the two-level atom for measuring G the universal gravitational constant.
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September 2, 2009 • 77 mins
We look at absorption as a quantum effect and introduce the Einstein A and B coefficients for stimulated and spontaneous emission.
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August 31, 2009 • 71 mins
We use the classical electron oscillator model to derive the functional form of the index of refraction in material as well as the absorption, which we relate to the cross section.
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