B. Cheron et al., A NEW OPTICAL-PUMPING SCHEME USING A FREQUENCY-MODULATED SEMICONDUCTOR-LASER FOR HE-4 MAGNETOMETERS, Optics communications, 115(1-2), 1995, pp. 71-74
Recently, a distributed Bragg reflector (DBR) laser diode was develope
d by Spectra Diode Labs for helium optical pumping experiments. An int
eresting feature is the possibility of frequency modulation of the dio
de output by modulating the current intensity leading to a new pumping
scheme, never reported before. An application to the realisation of v
ery simple earth magnetometers without external modulators or external
RF field is proposed.