Here is an intro about what they did with one of the lasers:

A laser was stabilized to an atomic transition of rubidium in order to demonstrate the technological maturity of corresponding technology for subsequent drop tests of atoms under microgravity conditions. The laser system also allows for clock comparisons. Here, the frequency of an “optical oscillator,” the laser, is compared to the frequency of a quartz oscillator that “ticks” in the radio frequency range, like a modern wristwatch. The general theory of relativity presumes that the “ticking” of all clocks is affected by gravity in the same way, regardless of how these clocks are implemented physically and technically. An initial test in April 2015 confirmed the suitability of such “atomic clocks” and of the laser systems required to test the general theory of relativity in space. The goal is now to confirm the initial results after some technical improvements have been applied to the system.

The full results will be in soon so check back.

And in a related space laser video and test astronomers did something unique.  Here is a bit more from their deployment:

One of the first images of the 22-watt laser being launched, taken by the Laser Pointing Camera (LPC) [1], shows the intense orange beam pointed at a globular cluster. Another LPC image shows the laser pointed close to the planet Saturn.

The Adaptive Optics Facility uses sensors to analyse the atmospheric turbulence and a deformable mirror integrated in the telescope to correct for the image distortions caused by the atmosphere. But several bright point-like stars needs to be at hand in order to correct for the effects of turbulence, and these need to be very close to the science target in the sky.

This sounds interesting and look forward to seeing more of the results from this test.  Also here is an extra video below showing a cool space timelapse taken at the facility!

thanks to eso.org for the info and pic

thanks to phys.org for the great info