I found a way in Labview Signal Express to record some measurement values of a signals into a file :

"Ajouter un étape" => "charger/enregistrer des signaux" => "signaux analogiques" => "enregistrer au format ASCII/LVM"
and then, one selects any signal available (signals or defined measurements)

presently, the file embbed only the last mean measurement of the laser PZT.
this file could be used to share data with other tools which could be use to correct the motor position in the ATK panel as a first step for automatisation process.

for example, I wrote an Octave code which is able to display this mean value every seconds.