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.

Education Higher Education Science & Medicine Natural Sciences

Update frequency: every 4 days
Average duration: 74 minutes
Episodes: 21
Years Active: 2009

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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-…

01:17:12 | Thu 05 Nov 2009

Emission Spectroscopy

We look at basic methods of emission spectroscopy including laser induced fluorescence, resonant enhanced multi-photon emission (REMPI), intermodulated fluorescence and stimulated emission pumping.

01:13:59 | Thu 29 Oct 2009

Absorption Spectroscopy

WE look at basic techniques of absorption spectroscopy including direct detection, frequency modulation, intracavity absorption and cavity ringdown spectroscopy.

01:17:07 | Tue 27 Oct 2009

spectral line profiles

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 broad…

01:15:28 | Thu 22 Oct 2009

Interferometers

We look at how interferometers can be used to measure wanelength.

01:15:40 | Tue 13 Oct 2009

Spectrometer Operation

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).

01:19:02 | Thu 08 Oct 2009

Photodetectors

We consider the advantages and disadvantages of three classes of photodetectors: photodiodes, photomultiplier tubes and thermal detectors.

01:20:55 | Tue 06 Oct 2009

Tunable Lasers

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.

01:14:18 | Tue 29 Sep 2009

Fundamentals of Lasers

We look at 3-level and 4-level gain systems in laser amplifiers, discuss optical cavities and tuning elements of laser oscillators.

01:18:47 | Thu 24 Sep 2009

Molecular Absorption

We look at an example of calculating the bond length and bond strength of HCl from a measured mid IR absorption spectrum.

01:02:02 | Thu 24 Sep 2009

Molecular Energy Levels

We look at energy levels associated with rotation and vibration of molecular bonds

01:20:38 | Thu 24 Sep 2009

Energy Levels

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.

01:15:57 | Tue 15 Sep 2009

Gravity Measurements

We look at an application of our previous quantum treatment of the two-level atom for measuring G the universal gravitational constant.

01:11:38 | Thu 10 Sep 2009

Quantum Model of Absorption

We look at absorption as a quantum effect and introduce the Einstein A and B coefficients for stimulated and spontaneous emission.

01:17:05 | Thu 03 Sep 2009

$Index of Refraction and Absorption$

Index of Refraction and Absorption

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.

01:11:40 | Tue 01 Sep 2009

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