previouly we used ocean optics USB4000, then we found it has double peak structure, after changing fibers and USB2000. We found it's the problem of USB4000, also it's calibration is off by 0.5nm
We are trying to have a service repair and now we just use USB2000

We also found the calibration source HG-1 produce addtional lines other than it should. we are trying to have a service repair also.

Use USB2000 can see HG-1 remaining lines at correct position, so it's calibrated correctly, but it doesn't have enough resolution for tell 0.3 FWHM

A note, we need use the yellow larger diameter fiber for calibration as HG-1 has only weak light. for measuing laser, we need to use small diameter blue fiber so it won't saturate.

When test, the fiber head is direct in laser light

The central peak 794.8 is at 27w as suggested by manufacturer.


Zhiwen on 12/06/2012