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AdV-PSL (Laser Bench setup)
Cleva, Kefelian - 1:34 Tuesday 11 September 2018 (42669) Print this report
neoVAN pump fiber investigations

# After our investigations on the output of the neoVAN fibers we give back the PSL. Since datadisplay shows a huge latency it is not possible to get any info from it for assesment of the powers at PSL level after our work. Anyway the powermeter indicates 86 W at the output of the neoVAN.
Data will come later regarding the neoVAN fiber output.

# Btw we 've noticed that the coils installed with Bastian Schultz on the pump fiber have been removed, likely during the neoVAN_60W_pump swap unless some misunderstanding.Those coils were supposed to improve the homogeneity at the fiber output.

# There is no over-pressure in the laser lab since our arrival, could be an issue wrt the dusts contamination on the bench

 

Comments to this report:
cleva - 10:50 Tuesday 02 October 2018 (42865) Print this report

After the work done on the neoVAN fiber we notice a power reduction of ~ 2 W at the neoVAN output. This is visible on plot 1, blue curve: PSL_AMP_DC signal (see plot 2 for the associated legend)

We notice a large neoVAN beam alignement drift around the operations on the fibers. Visible on the plot 3: this is the differential between the neoVAN beam profile before and after the fiber operation. We notice 126 um beam drift

A possible explanation could be that the fiber were put back in place in their SMA sockets with a possible residual twist angle (few degrees) which could impact the orientation of the fiber outptut axis wrt the neoVAN crystal. Although we would have considered  this as a very small effect.

 

Preliminary Conclusion:

  1. the fiber does impact on the neoVAN optical axis
  2. the 2 W power lost could be recovered with a proper alignement of the seeder (optical axis of the seeder was kept untouched while the optical axis of the neoVAN was not)
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