Mitsuhashi, Shalika,

What we did:
We install the input mirror(Figure 1) anyway and checked that the reflected and the incident beam overlapped.
The reflected beam's power was 1.71mW.
We install the photo detector to get a error signal from cavity.

Now we didn't detected signals from the transmitted beam path, so we should optimaize the mirror's angle.

What we will do next:
We will optimaize the mirror angle.
We will checked whether the code for modulating laser frequency can run well or not.