[Kakei Yu, Kenta Tanaka, Dan Chen]

We measured the temperature dependence of the frequency of the main laser.

The laser beam was picked off in front of the PD used to monitor the laser output power. At this point, the laser power was approximately 57 mW. After inserting an ND filter with a transmission of about 1/200, a wavelength meter(HightFinesse WS-U) was placed for the measurement.

The initial laser settings before the measurement were:

• Current: 1.550 A
• Temperature: 41.85 °C

The laser frequency was measured while varying the temperature (results will be reported later).

After the measurement, the laser temperature was returned to the initial value. We then confirmed that PLLX, PLLY, PMC, and IMC were all successfully locked.