Tunable dual and multiple wavelength laser system

A method of using a tunable laser system, the method comprising:

• outputting, from a laser diode, a light beam comprising a plurality of frequencies within a visible portion of a light spectrum;
• passing the light beam through a collimating lens to produce a collimated light beam;
• providing the collimated light beam to a partial reflector), wherein a first portion of the collimated light beam reflects back into the laser diode and a second portion of the collimated light beam passes through the partial reflector;
• outputting, from the laser diode due to mixing of the light beam and the first portion of the collimated light beam, a self-injection-locked light beam comprising at least two frequencies in the visible portion of the light spectrum and having a frequency difference in a terahertz frequency range;
• and
• adjusting a distance between the laser diode and the partial reflector to select the at least two frequencies of the self-injection-locked light beam.

A method producing a dual wavelength tunable laser system, the method comprising:

• providing a laser diode, partial reflector, collimating lens, and translational stage, wherein the laser diode is configured to produce a light beam having a plurality of frequencies in a visible portion of a light spectrum;
• arranging the laser diode, partial reflector, and collimating lens so that a laser output from the laser diode passes through the collimating lens to the partial reflector;
• and
• arranging the laser diode or the partial reflector on the translational stage;
• and
• adjusting, by moving the translational stage, a distance between the laser diode and partial reflector so that a light beam reflected by the partial reflector into the laser diode mixes with a light beam produced by the laser diode to produce a self-injection-locked light beam comprising at least two frequencies in the visible portion of the light spectrum and having a frequency difference in a terahertz frequency range, wherein the at least two frequencies of the self-injection-locked light beam are based on the distance between the laser diode and the partial reflector.