Lab Book PrYSiO
Contents
14 October 2019
3d printer: Picaso 3D designer
Milling machine: MRobo F0403K
10 October 2019
- Produced the first Homodyne holder for detectors
- Mansur increased laser power to 230 mW
- Ian Miller responded that production will take two more weeks
- PDH circuit is in Kazan
9 October 2019
- Received laser generation with EOM installed
- Mansur increased ouput power to 120 mW
8 October 2019
- Aligned two fibers to couple HeNe laser into the dye laser
7 October 2019
- test detectors (homodyne)
- install EOM
- start assembly
- order Hall detectors
4 October 2019
- should buy:
- SCSL-20 (DS1002-01-20), Панелька однорядная цанговая 20 конт.
- 3 pin header
- EOM transmits 99%. Horizontally placed transmits H polarization, vertically- V.
3 October 2019
- Laser output power 370 mW
- Started testing EOM
30 September 2019
- install eom
- check laser linewidth
- check Pr sample
- check leakage
- spool the magnets
- check the magnets for quenching
- check external fluctuations of magnetic field
- keep vibrations of cryo in mind
- calibrate magnets with Erbium
28 September 2019
- PCB way responded
27 September 2019
- Dye laser is tuned to 606 nm, low output power up to 300 mW.
11 December 2020
We made resonant amplifier for EOM driver. The schematics consists from transformer with SMA connecters on both ends. One coil with inductance 46uH from the pair creates resonant LC circuits with the capacitance of 22pF of the EOM.
Thus it amplifies the signal ideally by Q factor of the resonator. The resonant frequency of the circuit is about 5.57 MHz. It may slightly vary depending on the connection (extra capacitance).
We send about ~360uW photodetector on the photodetector and see up to 5x increase of an optical phase modulation amplitude from ~1.5 mV to ~8 mV. It is important to align the EOM properly after detecting the modulation.
Scheme
Characterization setup
Observed modulation
21 December 2020
We measured a new Taiwanese crystal Pr:YSO at 4.2 Kelvin. The lifetime, optical depth and imhomogeneous broadening were as expected.
Laser scan shows Inhomogeneous absorption linewidth
Several spectral holes and their degradation with times
SHB.jpg shows the laser linewdith estimation to be ~400 kHz
