Virtual Beat Measurement

Theory

Equations for comb:

For Total Virtual Beat double f_CEO

Compare to Postprocessing Virtual Beat Measurement!

You find a program, Virtual Beat, to simulate the virtuel beat under: \\afs\iqo.uni-hannover.de\projects\magnesium\Mathematica\Kamm

Scheme from:Kerr-lens mode-locked lasers as transfer oscillators for optical frequency measurements, H. R. Telle et al., arXiv:physics/0107037v1 [physics.optics] (2001)

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 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!!!

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