Title

Measurement of Far-Infrared Laser Frequencies

Presenter Information

Patrick Mehl

Document Type

Oral Presentation

Location

SURC Room 140

Start Date

15-5-2014

End Date

15-5-2014

Keywords

Frequency, Laser, Beat

Abstract

Optically pumped molecular lasers have been used to generate thousands of laser emissions in the far-infrared region. These laser emissions can be used in a variety of applications, from terahertz imaging to conducting diagnostics on tokamak plasmas. To date, their primary use has been as frequency standards in high-resolution spectroscopic investigations into stable molecules and free radicals. For these laser emissions to be useful as reference standards in the far-infrared region, their wavelengths and frequencies need to be accurately determined. Most measurements of far-infrared wavelengths can be readily conducted to a fractional uncertainty on the order of a few parts in one thousand, about a factor of 1000 less than necessary for high-resolution investigations. The alternative is to measure the frequencies of these laser emissions which can be conducted with a fractional uncertainty on the order of a few parts in ten million. In this presentation, an overview of the three-laser heterodyne frequency measurement system will be presented along with some of the frequencies that have recently been measured with this system.

Faculty Mentor(s)

Jackson, Mike

Additional Mentoring Department

Physics

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May 15th, 12:40 PM May 15th, 12:59 PM

Measurement of Far-Infrared Laser Frequencies

SURC Room 140

Optically pumped molecular lasers have been used to generate thousands of laser emissions in the far-infrared region. These laser emissions can be used in a variety of applications, from terahertz imaging to conducting diagnostics on tokamak plasmas. To date, their primary use has been as frequency standards in high-resolution spectroscopic investigations into stable molecules and free radicals. For these laser emissions to be useful as reference standards in the far-infrared region, their wavelengths and frequencies need to be accurately determined. Most measurements of far-infrared wavelengths can be readily conducted to a fractional uncertainty on the order of a few parts in one thousand, about a factor of 1000 less than necessary for high-resolution investigations. The alternative is to measure the frequencies of these laser emissions which can be conducted with a fractional uncertainty on the order of a few parts in ten million. In this presentation, an overview of the three-laser heterodyne frequency measurement system will be presented along with some of the frequencies that have recently been measured with this system.