Inversionless laser
Inversionless laser a laser that operates without the need for a population inversion. In general, there are two types of inversionless lasers: those that have a hidden inversion in some eigenstate basis and those that do not. Raman and mollow lasers can be included in the category of hidden inversion. Lasers in the category of no hidden inversion are possible because it is polarization, not population, that produces gain. These lasers generally require at least three quantum mechanical states (for example, lambda and vee systems) and make simultaneous use of raman-like gain as well as induced transparency of the type associated with coherent population trapping or fano interference. Oscillators based on parametric gain, for ex- ample optical parametric oscillators or phase conjugate oscillators, are generally not considered inversionless lasers.
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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000
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