METHOD OF GENERATING ULTRA-SHORT LIGHT PULSES Russian patent published in 2012 - IPC H01S3/98 H01S3/94 

FIELD: physics.

SUBSTANCE: method of generating ultra-short light pulses during passive mode locking by intracavity absorbing medium relates to laser physics and can be used to make laser sources of stable light pulses with femto-attosecond duration. The method involves generating light pulses with a spectrum wider than the gain line spectrum, wherein total linear intracavity field loss and mirror loss exceed linear gain of the gain medium; the absorbing and gain medium are selected using one or different materials and the value of the dipole moment of the amplifying transition of the gain and absorbing media is greater than 1 D. The laser generates pulses with duration of the order of one period of the laser transition wave. The gain of the gain medium is sufficient to provide a peak Rabi pulse frequency value in the vicinity of the laser transition (10¹⁴-10¹⁵ Hz), and the ratio of beam cross-sections in the gain and absorbing media is selected in a wide range of values (±30%) near a value equal to the ratio of the dipole moment of the gain medium to twice the dipole moment of the absorbing medium.

EFFECT: possibility of generating pulses with duration of one optical period by selecting a gain medium with a large gain value and optical resonance with low mirror loss and using a focusing system which enables to control beam width in the absorbing medium.

1 dwg