Vm. Yermachenko et al., ABSORPTION SATURATION RESONANCES IN A DOU BLE-MODE MODE-LOCKED HENE CH4 LASER/, Kvantovaa elektronika, 22(6), 1995, pp. 573-578
An investigation was made of the amplitude characteristics of a double
-mode He-Ne/CH4 laser with linearly and orthogonally polarised modes,
when the cavity was frequency-modulated at a frequency close to the in
termode spacing. Under these conditions the intensities of the individ
ual modes had resonance structures near the centre of an absorption li
ne. These structures were narrow: their widths were less than the homo
geneous width of an absorption line.