Spectroscopy using active diode laser stabilization by optical f

Details Spectroscopy using active diode laser stabilization by optical f Spectroscopy using active diode laser stabilization by optical f

1997-10-10

1999-05-11

Rosenberger, Richard A.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

356440, 250343, G01N21/17

Patent

active

059033584

ABSTRACT:
A cavity ring down spectroscopy (CRDS) system uses a free-running continuous wave (c.w.) diode laser stabilized by frequency-shifted optical feedback in the presence of strong reflections from a high-finesse Fabry-Perot resonator. The frequency-shifted feedback stabilization eliminates the need for tightly controlling the relative positions of the laser and resonator. Non-frequency-shifted feedback is used for linewidth broadening. An acousto-optic modulator placed between the diode laser output and the resonator input frequency-shifts light reflected by the resonator input, causing the laser to cycle in phase with a period equal to the inverse of the frequency-shift. The laser diode linewidth can be stabilized from several MHz for high resolution spectroscopy of species at low pressures, to several hundred MHz for lower resolution spectroscopy of species at atmospheric pressures.

REFERENCES:
patent: 5528040 (1996-06-01), Lehmann
patent: 5757831 (1998-05-01), Kmetec et al.
Romanini, R. et al,; Diode Laser Cavity Ring Down Spectroscopy; Chemical Physics Letters 270; May 30, 1997; pp. 538-545.
Romanini, R. et al.; CE Cavity Ring Down Spectroscopy; Chemical Physics Letters 364; Jan. 10, 1997; pp. 316-322.
Martin, J. et al.; Visible-Wavelength Diode Laser with Weak frequency-Shifted Optical Feedback; Optics Communications 112; Nov. 1, 1994; pp. 109-121.

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