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Broadband ringdown spectral photography.

J J Scherer¹, J B Paul, H Jiao

¹Los Gatos Research, 67 East Evelyn Avenue, Suite 3, Mountain View, California 94041, USA.

|March 28, 2008

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Ringdown spectral photography (RSP) now captures broad optical bandwidth spectra in a single laser shot. This advancement offers high-sensitivity, rotationally resolved spectral data for diverse applications.

Area of Science:

Spectroscopy
Cavity Ringdown Spectroscopy
Molecular Spectroscopy

Background:

Traditional cavity ringdown spectroscopy (CRD) methods often require frequency scanning.
Previous demonstrations of ringdown spectral photography (RSP) utilized narrow-band, scanned laser light.
Acquiring broadband spectra with high resolution posed a significant challenge.

Purpose of the Study:

To introduce and demonstrate a novel technique for obtaining frequency-resolved cavity ringdown absorption spectra.
To enable the acquisition of spectra over a large optical bandwidth using a single laser pulse.
To enhance the efficiency and scope of cavity ringdown spectroscopy.

Main Methods:

Development of ringdown spectral photography (RSP) technique.

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Simultaneous recording of optical cavity's time and frequency response.

Utilizing orthogonal axes of a CCD array detector.

Application of single pulses of broadband visible laser light.

Main Results:

Successful demonstration of RSP using broadband laser pulses.
Acquisition of frequency-resolved absorption spectra over a large optical bandwidth.
Achieved high sensitivity and rotationally resolved spectral data.
Enabled spectral acquisition from a single laser shot.

Conclusions:

The demonstrated RSP technique significantly advances broadband spectral acquisition in cavity ringdown spectroscopy.
This method provides a highly sensitive and efficient approach for obtaining detailed molecular spectra.
RSP opens new possibilities for spectroscopic analysis across a wide range of applications.