Laser pumped magnetometer

Details Laser pumped magnetometer Laser pumped magnetometer

1994-04-04

1997-02-11

O'Shea, Sandra L.

Electricity: measuring and testing

Particle precession resonance

Using a magnetometer

324304, G01R 3324

Patent

active

056024754

ABSTRACT:
A single-mode semiconductor laser for optical pumping in H.sup.e and .sup.4 He and high-sensitivity magnetometers based upon these systems. A distributed Bragg reflection (DBR) or distributed feedback (DFB) single mode, preferably InGaAs laser diode (1) which obviates the need for optomechanical arrangements and their inherent instabilities as required by the prior art laser pumped magnetometers. By constructing a DBR or DFB region (28) within the laser diode structure, the laser is forced to operate within a single-mode at a wavelength that is jointly determined by the gain of the laser medium and feedback from the Bragg grating. This wavelength is controllable in one of three ways: (1) temperature control (13) of the laser diode junction and grating, (2) injection current control (12) within the gain region, (3) current control (11) of the Bragg grating region or any combination of the three. An alternative approach is to use the Fabry-Perot device and introduce an external grating control, if proper coatings are applied to the laser faces.

REFERENCES:
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patent: 4525672 (1985-06-01), Lam et al.
patent: 4780672 (1988-10-01), McGregor
patent: 4806864 (1989-02-01), Schearer et al.
patent: 5036278 (1991-07-01), Slocum
patent: 5053708 (1991-10-01), Aspect et al.
patent: 5436561 (1995-07-01), Leger

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