  A mere correspondence between the electron statistics and the photon one
vanishes in the feedback loop (FBL). It means that the direct photodetection,
supplying us with the electron statistics, does not provide us with a wished
information about the laser photon statistics. For getting this information we
should think up another measurement procedure, and we in the article suggest
applying the three-level laser as a auxiliary measuring device. This laser has
impressive property, namely, its photon statistics survive information about
the initial photon statistics of the laser which excites coherently the
three-level medium. Thus, if we choose the laser in the FBL as exciting the
three-level laser, then we have an possibility to evaluate its initial photon
statistics by means of direct detecting the three-level laser emission.
Finally, this approach allows us to conclude the feedback is not capable of
creating a regularity in the laser light beam. Contrary, the final photon
fluctuations turn out to be always even bigger. The mentioned above feature of
the three-level laser takes place only for the strong interaction between the
lasers (exciting and excited). It means the initial state of the exciting laser
is changed dramatically, so our measurement procedure can not be identified
with some non-demolition one.
