Member: Matteo, Eleonora, Yuefan
Last Friday, we installed the mirror part of the cavity,tried to align it. For doing this, firstly we add 20 kiloohm resistance to the present photo diode to increase the sensitivity at the cost of reducing the bandwidth(200 kHz). At the first try,we got multiple modes.With two mirrors and the lens, we tried to rule out higher modes and get the TEM00 one, but found out that there is misalignment in the vertical direction. After adding some piece under the mirror block, this problem has been solved, but still we cannot get rid of the effect of TEM02(TEM20) mode. We will restart the alignment again today, try to make some progress.