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Clocklaser
Typical values and datasheets of the clocklaser system
Laserdiode (ECDL)
- Temperature Laserdiode (marking 1):
- act: 24,4°C [Sep, 2019]
- set: 24,4°C [Sep, 2019]
- min-max: 15°C - 35,1°C [Sep, 2019]
- act: 24,5°C [2018]
- Typical Current Laserdiode (marking 1):
- act: 98 mA [Sep, 2019]
- set: 97/98 mA [Sep, 2019]
- act: 96 mA [2018]
Tapered Amplifier (TA)
- Typ: EYP-TPA-0915-01500
- Datasheet: EYP-TPA-0915-01500
- Temperature TA (marking 2):
- act: 20°C [Sep, 2019]
- set: 20,1°C [Sep, 2019]
- min-max: 15 - 35,1°C [Sep, 2019]
- act: 20°C [2018]
- Typical Current TA (marking 2):
- act: 1364/ 1453 mA [Sep, 2019] <fc #ff0000>wieso zwei verschiedene Werte?</fc>
- set: 1464 mA [Sep, 2019]
- max < 1,5 A
- act: 1176 mA [2018]
Turning on and off the clocklaser system
Turning on the laser
We use toptica electronics:
- Turning the main-key to on. The LED´s from the temperature control will go on!
- Push the green button. The green LED from the button will go on!
- Switch on the toggle (=Kippschalter) of the laserdiode controller. The green LED of the laserdiode controller will go on!
- 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!
- Push the red button. The green LED will go out!
- Turning the main-key to “mains”
Only turning off the laserdiode
- Switch off the toggle from the TA. The green LED from the TA module will go out!
- Switch off the toggle from the laserdiode. The green LED from the laserdiode module will go out!
Only turning off the TA
- Switch off or on the toggle from the TA. The green LED from the TA module will go out!
Fast Locking of R1
- Check laser frequency with wavemeter:<fc #ff0000> XXX </fc>
- Check laser power @ upstairs PD: Display should shown stop position
- Check modes of scan cavity: Has to be single mode
Note: If cases 1, 2 and 3 are given, then lock the laser like:
- <fc #ff0000>XXX Das darfst du schreiben mit welchen Knopf wann gedrückt wird</fc>
- <fc #ff0000>XXX</fc>
- <fc #ff0000>XXX</fc>
When errors:
- To less power @ upstairs PD
- To less power @ scan cavity
- Acoustic Signal of TA controller
→ Increase incouple power of TA
Info: necessary lock power: ~200mW
- turn off the TA lock:
- turn off the I and P switch
- Note: D is always off
- TA Lock
- first Check:
- Info: necessary lock power: 200mW
- If the incoupling is good → ∼1A - after TA (Pos.C): ~200mW
- fast acoustic Signal means the powerstabilisation warning (lock power too low <fc #ff0000>gibt es noch andere Gründe?</fc>)
Power up the clocklaser system
Laser
- Check power of Laserdiode direct after laser housing (Pos.A)
- TA Lock
- first Check:
- Info: necessary lock power: 200mW
- If the incoupling is good → ∼1A - after TA (Pos.C): ~200mW
- fast acoustic Signal means the powerstabilisation warning (lock power too low <fc #ff0000>gibt es noch andere Gründe?</fc>)
- If the incoupling is bad (frequent cause of powerstabilisation warning/ show “error 1”):
- P-Stab. off (PID) & block the beam!
- adjust mirror MTA (horizontal beam way); references are the peaks (CH4) of Single-Mode-Signal (show “ideal situation”)
- Test and switch on the P-stab. (beam is blocked!): warn signal on?
- if the acoustic signal is off > measure the incoupling power (Pos.E) max. ~120müW
- Lock the Resonator
R1
- Modelocking of R1
- Tune the Piezo upto TEM00 is observable
- if necessary use Mode-Reset
- Intensity Lock of R1
- after Isolator (ISO3) direct infront R1 (Pos.E): max. ~120müW / min. ~100müW
- otherwise improve the optical way to the Isolator for more power
- mit Output Offset des Intenstitäts-PID auf 100müW herunterdrehen
- HENCE: Check always Power after Isolator of R1: not more than 100müW!!!
- Only aktivate PDH/TA-Lock + couple into R1, if the power is 100(±20)müW after the Isolator of R1
- Modelocking of R1 (Step 1)
- Lock RAM
- Lock Fiberstabilization
Littmann design
Typical efficiencies at 916 nm:
- Isolators: 80 %
- AOMs: 50-60 %
- Fiber coupling: 50 %
Typical values for the laser:
- Frequency: 327.5293 THz (doubled upstairs directly behind SHG: 655.058 566 THz)
- Frequency: 327.5294 THz [Sep, 2019]
- Power after ECDL (Pos.A):
- ~11,2 mW (@~97/98 mA) [Sep, 2019]
- ~12 mW (@ ~90 mA) [2016]
- ~<fc #ff0000>XX</fc> mW (@ ~96 mA) [2016]
- Power front of TA (Pos.B):
- ~ 9 mW [Sep, 2019]
- Power after TA (Pos.C):
- ~290 mW (@~1364 mA) [Sep, 2019]
- ~<fc #ff0000>XX</fc> mW (@ ~1165 mA) [2018]
- ~200 mW (@ ~1000 mA) [2016]
- Power after TA (Pos.D):
- ~ 230 mW (@~1364 mA) [Sep, 2019]
- Power in front of ISO3
- ~ 135müW (@~1364 mA TA) [Sep, 2019]
- Power in front of ISO3
- ~ 120müW (@~1364 mA TA) [Sep, 2019]
TA current should be <1.2A <fc #ff0000>noch richtig, wenn jetzt 1,4A?</fc> otherwise the fiber stabilization will soar (=aufschwingen)
Typical values in front fibers:
- Power before fiber for wavemeter/comb/mode analysis cavity:
- ~12 mW [2016]
- ~<fc #ff0000>XX</fc> mW [2018]
- Power before AtomLabFiber:
- ~30 mW → 15 mW upstairs before TA [2016- without fiber stabilization]
- ~<fc #ff0000>XX</fc> mW → 20 mW upstairs before TA [2018]
- Power to R2:
- ~2.5 mW [2016]
- ~<fc #ff0000>XX</fc> mW [2018]
Typical values after fibers:
- Power before fiber for
- Comb:
- ~<fc #ff0000>XX</fc> mW [2018]
- Wavemeter:
- ~<fc #ff0000>XX</fc> mW [2018]
- Scan cavity:
- ~<fc #ff0000>XX</fc> mW [2018]
- Power after AtomLabFiber:
- 20 mW upstairs before TA [2018]
- Power after R2 fiber:
- ~<fc #ff0000>XX</fc> mW [2018]
Typical values for the resonators:
- In front of telescope: 2.2 mW
- In front of AOM: 1.5 mW
- In front of fiber: 450 µW
- 100 µW between Isolator and BS
- 50 µW in front of Resonator
Typical values for locking signals:
- PDH error signal locked ~500 mV PP / unlocked ~200 mV PP
- Intensity Error signal ~2 mV PP / DC:
- Fiber Stabilization Locked ~200 mV PP / Unlocked ~2 Volt PP
Manuals and Datasheets