A 1083 nm Narrow−Linewidth DFB Semiconductor Laser for Quantum Magnetometry

A broadband Ytterbium-doped tunable fiber laser for 3He optical pumping at 1083 nm

Large amounts of hyperpolarized He gas with high nuclear polarization rates are required for use in neutron spin filters or nuclear magnetic resonance imaging of human lung. Very high efficiency can be obtained by metastability exchange optical pumping using multimode lasers to excite the 2S-2P transition at 1083 nm. Broadband Ytterbium-doped tunable fiber lasers have been designed for that par...

Mutual injection locking of a fibre laser and a DFB semiconductor laser - Electronics Letters

ing that this power level causes little SHB. When the current is increased to 70mA (‘17ns’), the SHB increases. After the mode change (‘3011s’) the carrier density is highly asymmetric, with a large build-up of carriers at the rear facet. Further simulations showed that the time between the second transient and the onset of the mode change decreases when the drive current is increased, possibly...

1083 nm Ytterbium doped tunable fiber laser for 3 He pumping applications

Laser-induced quantum coherence in a semiconductor quantum well.

The phenomenon of electromagnetically induced quantum coherence is demonstrated between three confined electron subband levels in a quantum well which are almost equally spaced in energy. Applying a strong coupling field, two-photon resonant with the 1-3 intersubband transition, produces a pronounced narrow transparency feature in the 1-2 absorption line. This result can be understood in terms ...

Chirp Compensation in Active Mode-Locked Semiconductor Diode Laser Using a DFB

This thesis investigates the possibility of canceling chirp in an actively modelocked semiconductor laser using a DFB structure. The chirp is caused by the nonlinearity of the diode, namely, the line-width enhancement factor, a. The mode-locking equations are formed, and the postulated solution is a gaussian pulse shape. The diode is modeled primarily using the rate equations for carrier and ph...