Table of Contents
Three Corner Hat Measurement
First measurement ideas
Jan´s laser vs. Comb Hannover
- purple = current setup (06.10.2016)
- blue = setup for measurement
- red = unstabilized fiber → keep it short!
Jan´s laser vs. Comb Hannover and Link vs. Comb Hannover
- Shift the ManyPointBox and Link to the optical table
Second Try
Final Setup
Optical part
Electronic part
Frequencies
- Jan's Laser = 194.401.549 MHz (fine with Protocolbook 194.401.556 MHz).
- 916nm clock laser: 327.5291 THz (accuracy maybe worse than 100 MHz)
Measured with wavemeter in PTB (accuracy: +-30 MHz):
- 194.400.001 MHz Laser
- -47 MHz Regel-AOM
- +36 MHz Manypoint-extraktion-AOM
→ 194.399.990 MHz
Jan's transportable laser has a higher frequency:
- Mixer in Hannover run with +1515 MHz
- Beat is +44 MHz
- Jan's Laser = 194.401.549 MHz (fine with Protocolbook 194.401.556 MHz)
DDS-Programming
Ratio: N=n916/nLink = 3275292/1944000 = 1.684820987654321…
Inverted Ration: N'=1/N
For DDRS: M=(N')*2^48 = 167065212727755.34375 (dez) = 97f1e6a8b1cb.58 (hex) ~= 97f1e6a8b1cb (hex)
Alte Berechnung (Es wurden die Frequenzen geteilt und nicht die Modennummern)
- → ratio of ~ 1,684807
- → 474231011086950,203392
- [Hex]: 1AF4F82F51266
- → Inverted Ratio: 0,5935397770762964267907798116259
- 0,5935397770762964267907798116259 * 2^48 = 167066594929398,49071775301797611
- 167066594929398 [Deg] entspricht 97F2390B6AF6 [Hex]
→ Type 97F2390B6AF6 into the divider!!!