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Frequency tunability of the terahertz silicon laser by a magnetic field
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Image of FIG. 1.
FIG. 1.

(a) Scheme of the Si:Bi laser. The curved arrows mark the electronic relaxation processes assisted by an intervalley acoustic phonon (AP) and optical phonon (OP). The gray arrow up indicates optical pumping by a laser. The gray arrows down are for stimulated emission from the and donor transitions. (b) Schematic of the experimental setup: 1—superconducting magnet, 2—silicon sample, and 3—cold sapphire filter. Inset (c) shows schematically (not to scale) the linear Zeeman splitting of the impurity state under magnetic field applied along different crystal axes. , , and are the states, originating from the state for different valleys of the conduction band and different orientations of the magnetic field and the crystal axis. Note that all -type and -type states do not exhibit splitting.

Image of FIG. 2.
FIG. 2.

Dependence of the output power of Si:P and Si:Bi lasers on the applied magnetic field for different relative orientations.

Image of FIG. 3.
FIG. 3.

Evolution of the emission spectra of the Si:Bi laser with the magnetic field applied along the crystal axis [left: emission terminating in the state; right: emission terminating in the state]. The instrumental resolution is between 0.16 and .

Image of FIG. 4.
FIG. 4.

Evolution of the emission frequencies of the Si:Bi laser with increasing magnetic field and with the magnetic field parallel to different crystal axes.


Generic image for table
Table I.

Si:Bi laser frequency as a function of a magnetic field. is the frequency without magnetic field.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Frequency tunability of the terahertz silicon laser by a magnetic field