We confirmed that fiber amplifier is working well.
For the first step of introducing the high power laser system into the input optics, we measured the beam profile of output beam from fiber amplifier.
Experimental setup and plot are attached.
Fitting result is...
waist radius 362 um
waist position 87 cm
Next, we will put lens that makes beam diameter that is about 1/3 as small as aperture size of Faraday isolator.
