Finesse with P1 SUPRASIL, posted by Loïc Amoudry at Optical room about lasers and optics 
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P1 SUPRASIL has been installed instead of P1 Sapphire. It has been cleaned 3 times on each face with wipe+isopropanol before to be installed.
Finesse ~= 10 000 - 11 000 (EOM Sweep of 100 kHz in 10sec, see last image.)
Coupling ~= 45% |
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Finesse after 2days, posted by Loïc Amoudry at Optical room about lasers and optics
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Finesse measured this morning after P1 SUPRASIL being into the cavity for two days. In order to check if it's getting dirty.
Finesse still ~= 11 000 |
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P4 cleaned and finesse measurement, posted by Loïc Amoudry at Optical room about lasers and optics
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P4 cleaned with isopropanol.
Finesse measured afterward: ~=13 000 (clear increase) |
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Mirror's cleaning and finesse, posted by Loïc Amoudry at Optical room about lasers and optics
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Summary of what have been cleaned the last week:
P1 with isopropanol, finesse 11000
P4 with isopropanol, finesse 13000 |
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Injection of 33MHz Onefive through fiber, posted by Loïc Amoudry at Optical room about lasers and optics
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Output power of the Onefive, and power after injection and different components have been measured.
Coupling ~= 90%
Each of our two EOM roughly have the same loses ~3dB |
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33MHz Onefive power overtime decrease, posted by Loïc Amoudry at Optical room about lasers and optics
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Power of the 33MHz Onfive decreases over time. Have to pay attention to that.
Note that air dryers have never been stopped.
10th april 2018: ~40mW (first picture, 10dB filter) |
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New Suprasil mirror from LMA, posted by Loïc Amoudry at Optical room about lasers and optics
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14/05/19:
New Suprasil mirror received. It will replace the S-BOX suprasil mirror on ThomX which was already replacing the sapphire mirror.
First finesse measurement: 14000 |
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Finesse after cleaning (new suprasil mirror), posted by Loïc Amoudry at Optical room about lasers and optics
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15/05/19-20/05/19:
Cleaning of the mirrors:
Initial finesse 14000 @air |
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Finesse measurement by decay time technique, posted by Ronic Chiche at Optical room about lasers and optics
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5 Files attached:
- Note on the technique and results for the present cavity on 2019, May 21th : F ~ 18 000
- 2Tektronix scope raw data |
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Transmission of Sapphire mirror, posted by Loïc Amoudry at Optical room about lasers and optics
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| See image. |
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Amplifier mission Bordeaux, posted by Loïc Amoudry at Other about mechanics | lasers and optics
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Voyage Bordeaux au CELIA avec Jérôme LHERMITE (Loïc et Titoutan)
1er jour (34°) :
Mesure du spectre et de la puissance des 4 diodes de pompe 3ème étage jusqu’à ~60W (12A). |
Amplifier mission Bordeaux, posted by Loïc Amoudry at Other about mechanics | lasers and optics
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M² mesuré à 10W.
M²x = 1.17
M²y = 1.14 |
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Polarization, posted by Loïc Amoudry at Optical room about lasers and optics
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Polariztion measured with Input vertically/horizontally polarized (~100% DOLP)
- Transmission (P4) locked on cavity horizontal polarization is ~50% linearly polarized and ~50% unpolarized ?
- Transmission (P4) locked on cavity vertical polarization is ~50% linearly polarized and ~50% unpolarized ? |
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telescope for Koheras, posted by Huan Wang at Optical room about lasers and optics
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telescope of Koheras is removed, information record here:
- distance between collimator edge and -50 lens mount edge is 14.7cm,
- distance between another edge of -50 lens mount and +250 lens mount edge is 14.3cm, |
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New design for PDH boxes, posted by Ronic Chiche at Optical room about detectors and electronics
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A new design has been studied for the 5 PDH boxes to better match the low (33MHz) repetition rate of the ThomX laser.
the 5 PDH boxes have been modified and tested (see the attached report).
A mixer has been integrated to the PDH box for a more simple use. |
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Onefive 33MHz unmodelocked, posted by Loïc Amoudry at Optical room about lasers and optics
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Oscillator randomly unmodelocked on 3rd july afternoon (during oscillator power measurement, maybe a reflection from the powermeter power filter
?)
Modelocked this afternoon by putting Onefive motor and phase at reference on the PTC software. |
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2nd stage output power validated , posted by Loïc Amoudry at Optical room about lasers and optics
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Onefive output power : 28mW
Power before fiber injection : 7.8mW
After EOM and 99% coupling fiber : 1.8mW |
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Spin coater air supply removed and front panel changed, posted by Loïc Amoudry at Optical room about mechanics | lasers and optics
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Spin coater firstly needed vacuum and air supply. The air supply being useless for our experiments, it has been disabled.
The process is the following and is reversible:
1) Remove the hub from the top of the spin coater, (see picture 1), 4 screws |
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Finesse measurement after mirror cleaning using the spin coater, posted by Ronic Chiche at Optical room about lasers and optics
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Last Finesse measurement in air : ~ 17 000 the 20th of may (see logbook)
28th and 29th of august, we cleanned, with Loïc, mirrors S3 then P1 successively using only ultra pure water with the spin coater.
we measured the finesse after each cleaning by modulation technique and in both cases, F ~ 12 500 !!! |
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Finesse measurement after mirror cleaning using the spin coater, posted by Ronic Chiche at Optical room about lasers and optics
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today I cleaned S3 with isopropanol and then with pure water on spin coater.
Finesse is only 10 700.(coupling 50% ? => to be confirmed...)
maybe we have to redo the procedure with a different way of cleanig (pushing less on the mirror ... ?) |