Table of Contents

Clocklaser

Put a paper infront R1 and R2, when beam adjustment! Too high input power can damage the mirrors of the resonator!

Typical values and datasheets of the clocklaser system

Laserdiode (ECDL)

Tapered Amplifier (TA)

Light with input power of min 10mW must pass TA! Maximum current is 3A. Otherwise the TA will be broken

Turning on and off the clocklaser system

Turning on the laser

We use toptica electronics:

  1. Turning the main-key to on. The LED´s from the temperature control will go on!
  2. Push the green button. The green LED from the button will go on!
  3. Switch on the toggle (=Kippschalter) of the laserdiode controller. The green LED of the laserdiode controller will go on!
  4. Switch on the toggle of the TA, if he is seeded! The green LED of the TA controller will go on!

Note: If the switches are on, then not steps 3. & 4.

Turning off the laser

Note: Both toggles to switch off the laserdiode and TA are not required!

  1. Push the red button. The green LED will go out!
  2. Turning the main-key to “mains”

Only turning off the laserdiode

  1. Switch off the toggle from the TA. The green LED from the TA module will go out!
  2. Switch off the toggle from the laserdiode. The green LED from the laserdiode module will go out!

Only turning off the TA

  1. Switch off or on the toggle from the TA. The green LED from the TA module will go out!

Fast Locking of R1

  1. Check laser frequency with wavemeter: XXX
  2. Check laser power @ upstairs PD: Display should shown stop position
  3. Check modes of scan cavity: Has to be single mode

Note: If cases 1, 2 and 3 are given, then lock the laser like:

  1. XXX Das darfst du schreiben mit welchen Knopf wann gedrückt wird
  2. XXX
  3. XXX

Errors

A) To less power @ upstairs PD
B) To less power @ scan cavity
C) Acoustic Signal of TA controller

Solution of A, B and C: In most cases it is sufficient to increase incouple power of TA

Necessary lock power: ~200mW An welcher Stelle?
  1. turn off the TA lock:
    1. turn off the I and P switch
    2. Note: D is always off
  2. Adjust the incoupling power in the TA with mirror XYZ in vertical direction until Errors A and B are fixed
  3. Lock of TA
    1. If the incoupling is good → ∼1A - after TA (Pos.C): ~200mW

Power up the clocklaser system

Laser

  1. Check power of Laserdiode direct after laser housing (Pos.A)
  2. TA Lock
    1. first Check:
      1. Info: necessary lock power: 200mW
      2. If the incoupling is good → ∼1A - after TA (Pos.C): ~200mW
      3. fast acoustic Signal means the powerstabilisation warning (lock power too low gibt es noch andere Gründe?)

  1. If the incoupling is bad (frequent cause of powerstabilisation warning/ show “error 1”):
    1. P-Stab. off (PID) & block the beam!
    2. adjust mirror MTA (horizontal beam way); references are the peaks (CH4) of Single-Mode-Signal (show “ideal situation”)
    3. Test and switch on the P-stab. (beam is blocked!): warn signal on?
    4. if the acoustic signal is off > measure the incoupling power (Pos.E) max. ~120müW
    5. Lock the Resonator

R1

  1. Modelocking of R1
    1. Tune the Piezo upto TEM00 is observable
    2. if necessary use Mode-Reset
  2. Intensity Lock of R1
    1. after Isolator (ISO3) direct infront R1 (Pos.E): max. ~120müW / min. ~100müW
      1. otherwise improve the optical way to the Isolator for more power
    2. mit Output Offset des Intenstitäts-PID auf 100müW herunterdrehen
  3. HENCE: Check always Power after Isolator of R1: not more than 100müW!!!
  4. Only aktivate PDH/TA-Lock + couple into R1, if the power is 100(±20)müW after the Isolator of R1
  5. Modelocking of R1 (Step 1)
  6. Lock RAM
  7. Lock Fiberstabilization

Littmann design

Typical efficiencies at 916 nm:

Typical values for the laser:

TA current should be <1.2A noch richtig, wenn jetzt 1,4A? otherwise the fiber stabilization will soar (=aufschwingen)

Typical values in front fibers:

Typical values after fibers:

Typical values for the resonators:

Typical values for locking signals:

Manuals and Datasheets