| ID |
Date |
Author |
Status |
Type |
Category |
Location |
Title |
|
95
|
Wed Jun 8 11:10:17 2022 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | software | Optical room | Cavity Lock |
Start with the cavity lock images attached, taken from last week, at start we have a coupling ~ 5% and started improving on the alignment .
The image of 00 modes attached corresponds to the coupling seen on the oscilloscope.
We have a higher coupling with the 11 mode due to the size of the injected beam in comparison to mode
lenses were added to improve it. |
| Attachment 1: Screenshot_2022-05-30_0_125247.png
|
 |
| Attachment 2: 20220530_00_Mode.bmp
|
| Attachment 3: 11.bmp
|
|
97
|
Wed Jun 8 11:31:47 2022 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | software | Optical room | Cavity Lock |
Current setup at SBox for locking the cavity
After spacial matching, the coupling increased to ~ 15 - 20 %
The locking was done for the fundamental mode, tried to improve the coupling with the motors, but the lock is very unstable to be investigated. (Note: the cavity in under normal pressure)
| Manar Amer wrote: |
|
Start with the cavity lock images attached, taken from last week, at start we have a coupling ~ 5% and started improving on the alignment .
The image of 00 modes attached corresponds to the coupling seen on the oscilloscope.
We have a higher coupling with the 11 mode due to the size of the injected beam in comparison to mode
lenses were added to improve it.
|
|
| Attachment 1: 20220607_SBox_Setup.png
|
 |
| Attachment 2: Ma1_Ma2_Horizontal_end-of-day.jpg
|
 |
| Attachment 3: Ma1_Ma2_Vertical_end-of-day.jpg
|
 |
|
98
|
Thu Jun 9 19:59:42 2022 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | software | Optical room | Cavity Lock |
Cavity locked today under vacuum and no airflow, it is stable over a long time
the alignment was improved and an increase of the transmission by 20 % from its original value
unfortunately, data from the oscilloscope was saved, but it was not in the correct format (image) to show.
Attached ; the mode shape, the new motor positions.
| Manar Amer wrote: |
|
Current setup at SBox for locking the cavity
After spacial matching, the coupling increased to ~ 15 - 20 %
The locking was done for the fundamental mode, tried to improve the coupling with the motors, but the lock is very unstable to be investigated. (Note: the cavity in under normal pressure)
| Manar Amer wrote: |
|
Start with the cavity lock images attached, taken from last week, at start we have a coupling ~ 5% and started improving on the alignment .
The image of 00 modes attached corresponds to the coupling seen on the oscilloscope.
We have a higher coupling with the 11 mode due to the size of the injected beam in comparison to mode
lenses were added to improve it.
|
|
|
| Attachment 1: 00_Mode_Locked_Under_vacuum.bmp
|
| Attachment 2: Ma1_Ma2_Horizontal_end-of-day.jpg
|
 |
| Attachment 3: Ma1_Ma2_Vertical_end-of-day.jpg
|
 |
|
101
|
Wed Jul 6 18:34:12 2022 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | software | Optical room | Cavity Lock |
Closing the series for the setup
The cavity was only locked @ 133.33 MHz but the Finesse was not measured
The FSR was changed to match the new laser MENHIR 216.6625 MHz
| Manar Amer wrote: |
|
Cavity locked today under vacuum and no airflow, it is stable over a long time
the alignment was improved and an increase of the transmission by 20 % from its original value
unfortunately, data from the oscilloscope was saved, but it was not in the correct format (image) to show.
Attached ; the mode shape, the new motor positions.
| Manar Amer wrote: |
|
Current setup at SBox for locking the cavity
After spacial matching, the coupling increased to ~ 15 - 20 %
The locking was done for the fundamental mode, tried to improve the coupling with the motors, but the lock is very unstable to be investigated. (Note: the cavity in under normal pressure)
| Manar Amer wrote: |
|
Start with the cavity lock images attached, taken from last week, at start we have a coupling ~ 5% and started improving on the alignment .
The image of 00 modes attached corresponds to the coupling seen on the oscilloscope.
We have a higher coupling with the 11 mode due to the size of the injected beam in comparison to mode
lenses were added to improve it.
|
|
|
|
|
115
|
Tue Jul 12 19:07:50 2022 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | software | Optical room | CELIA amplifier installation |
The amplifier was installed on the optical table next to SBox table.
The CVBG that will be used for stretching before amplification needs cleaning (they are very fragile, 'ask victor for best method')
The software to drive the diodes of the amplifier we have is not the compatible one. |
|
116
|
Fri Jul 22 17:07:32 2022 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | software | Optical room | CELIA amplifier installation + chiller |
Amplifier placed next to the pulsed laser on the table under the airflow
The output is in free space with height from the table of about 10 cm, note the injection height into the cavity is between 14 - 15 cm.
a power cable is placed but not plugged.
Connection to the computer is made using USB B on amplifier to USB A (note need a longer cable, the available on is too short)
The cooling, to be connected to an outside chiller, will use the bottom one shown in the image attached.
The two water tubes, from chiller to amplifier, has been marked. The size of the tubes from the amplifier fit inside the tubes from the chiller.
| Manar Amer wrote: |
|
The amplifier was installed on the optical table next to SBox table.
The CVBG that will be used for stretching before amplification needs cleaning (they are very fragile, 'ask victor for best method')
The software to drive the diodes of the amplifier we have is not the compatible one.
|
|
| Attachment 1: WhatsApp_Image_2022-07-22_at_4.26.24_PM.jpg
|
 |
| Attachment 2: WhatsApp_Image_2022-07-22_at_4.26.24_PM.jpg
|
 |
| Attachment 3: WhatsApp_Image_2022-07-22_at_5.02.24_PM.jpg
|
 |
|
118
|
Fri Jul 22 18:00:21 2022 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | software | Optical room | Alignment / Table setup |
The current setup of the optical table attached.
The cavity is aligned and the lock of the fundamental mode has been attempted, but the mode is drifting too quickly to be able to follow.
I have placed the cavity under vacuum for a better stability.
a simple telescope for the CW was adjusted to having 2 lenses of 300 mm placed ~ 250 mm away from the colimator and 200 mm lens placed after it with 510 mm.
|
| Attachment 1: 20220722_table_setup.jpg
|
 |
| Attachment 2: 20220722_tablesetup.jpg
|
 |
|
119
|
Fri Jul 22 18:19:13 2022 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | software | Optical room | CVBG stretching / Fiber Injection |
Before injecting into the amplifier, the pulse needs to be stretched using a CVBG, type attached.
the CVBG is to be used at a small angle, the beam shape and spectrum after the PBS is attached.
After measuring the beam profile, a mirror was placed to direct all the power for fiber injection
power before the fiber is 13 mW and the power injected is 6.19 mW
|
| Attachment 1: CVBG.jpg
|
 |
| Attachment 2: beamafterCVBG.jpg
|
 |
| Attachment 3: beamafterCVBG_Fit.jpg
|
 |
| Attachment 4: beamafterCVBG_saturated.jpg
|
 |
| Attachment 5: SpectrumafterCVBGzoom.png
|
 |
| Attachment 6: CVBG_Injection_Setup.jpg
|
 |
| Attachment 7: 20220722_CVBG_stretching.jpeg
|
 |
|
120
|
Fri Jul 22 18:25:31 2022 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | software | Optical room | CELIA amplifier installation + chiller |
The software to control the CELIA amplifier is on the laptop that was placed in ThomX bunker.
I have placed it in the PLIC room next to the SBox table.
it is called 'Alphanov Control Software'
| Manar Amer wrote: |
|
Amplifier placed next to the pulsed laser on the table under the airflow
The output is in free space with height from the table of about 10 cm, note the injection height into the cavity is between 14 - 15 cm.
a power cable is placed but not plugged.
Connection to the computer is made using USB B on amplifier to USB A (note need a longer cable, the available on is too short)
The cooling, to be connected to an outside chiller, will use the bottom one shown in the image attached.
The two water tubes, from chiller to amplifier, has been marked. The size of the tubes from the amplifier fit inside the tubes from the chiller.
| Manar Amer wrote: |
|
The amplifier was installed on the optical table next to SBox table.
The CVBG that will be used for stretching before amplification needs cleaning (they are very fragile, 'ask victor for best method')
The software to drive the diodes of the amplifier we have is not the compatible one.
|
|
|
|
129
|
Fri Aug 19 16:02:33 2022 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | software | Optical room | CELIA amplifier installation + chiller |
Closing series
| Manar Amer wrote: |
|
The software to control the CELIA amplifier is on the laptop that was placed in ThomX bunker.
I have placed it in the PLIC room next to the SBox table.
it is called 'Alphanov Control Software'
| Manar Amer wrote: |
|
Amplifier placed next to the pulsed laser on the table under the airflow
The output is in free space with height from the table of about 10 cm, note the injection height into the cavity is between 14 - 15 cm.
a power cable is placed but not plugged.
Connection to the computer is made using USB B on amplifier to USB A (note need a longer cable, the available on is too short)
The cooling, to be connected to an outside chiller, will use the bottom one shown in the image attached.
The two water tubes, from chiller to amplifier, has been marked. The size of the tubes from the amplifier fit inside the tubes from the chiller.
| Manar Amer wrote: |
|
The amplifier was installed on the optical table next to SBox table.
The CVBG that will be used for stretching before amplification needs cleaning (they are very fragile, 'ask victor for best method')
The software to drive the diodes of the amplifier we have is not the compatible one.
|
|
|
|
|
130
|
Fri Aug 19 16:03:17 2022 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | software | Optical room | Alignment / Table setup |
closing series
| Manar Amer wrote: |
|
The current setup of the optical table attached.
The cavity is aligned and the lock of the fundamental mode has been attempted, but the mode is drifting too quickly to be able to follow.
I have placed the cavity under vacuum for a better stability.
a simple telescope for the CW was adjusted to having 2 lenses of 300 mm placed ~ 250 mm away from the colimator and 200 mm lens placed after it with 510 mm.
|
|
|
131
|
Fri Aug 19 16:03:40 2022 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | software | Optical room | CVBG stretching / Fiber Injection |
closing series
| Manar Amer wrote: |
|
Before injecting into the amplifier, the pulse needs to be stretched using a CVBG, type attached.
the CVBG is to be used at a small angle, the beam shape and spectrum after the PBS is attached.
After measuring the beam profile, a mirror was placed to direct all the power for fiber injection
power before the fiber is 13 mW and the power injected is 6.19 mW
|
|
|
64
|
Mon Jul 5 14:14:01 2021 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | Optical room | OEwaves CW Laser - Phase Noise |
- We started measuring the phase noise on the OEwaves CW laser.
- Class 3b
- wavelength 1.5 um
- The procedure is done using self coupling of the laser
- splitter 50%-50%\
- delay line 100 m
- all fibers are PM type (polarity maintained)
- Photodetector is "lab buddy", very fast diode.
- Note: différance from schematic (we did not use a low pass filter)
|
| Attachment 1: 20210207_OEwaves_laser.jpg
|
 |
| Attachment 2: 20210207_Self_coupling_setup.jpg
|
 |
| Attachment 3: Schematic-setup-for-optical-delayed-self-coupling-detection.png
|
 |
|
65
|
Mon Jul 5 14:40:57 2021 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | Optical room | OEwaves CW Laser - Phase Noise |
a correction on the wavelength of the laser it is 1030 um
| Manar Amer wrote: |
- We started measuring the phase noise on the OEwaves CW laser.
- Class 3b
- wavelength 1.5 um
- The procedure is done using self coupling of the laser
- splitter 50%-50%\
- delay line 100 m
- all fibers are PM type (polarity maintained)
- Photodetector is "lab buddy", very fast diode.
- Note: différance from schematic (we did not use a low pass filter)
|
|
|
66
|
Mon Jul 5 14:46:44 2021 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | Optical room | OEwaves CW Laser - Phase Noise |
correction on unit 1030 nm
| Manar Amer wrote: |
|
a correction on the wavelength of the laser it is 1030 um
| Manar Amer wrote: |
- We started measuring the phase noise on the OEwaves CW laser.
- Class 3b
- wavelength 1.5 um
- The procedure is done using self coupling of the laser
- splitter 50%-50%\
- delay line 100 m
- all fibers are PM type (polarity maintained)
- Photodetector is "lab buddy", very fast diode.
- Note: différance from schematic (we did not use a low pass filter)
|
|
|
|
106
|
Wed Jul 6 19:57:17 2022 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | Optical room | 2 Mirror Setup @ 216.6 MHz |
The SBox cavity setup was changed to have only 2 mirrors M1 plane and M2 spherical, both from ThomX
Distance between the mirror ~ 72 cm , increased from 70 cm to take into account the thickness of the ThomX mirrors
Two lenses (300 mm @ 50 cm , 200 @ 104 cm) were placed to have the beam radius ~ 0.55 mm.
The cavity was locked with a coupling of 60 %, for Finesse measurement the sweep was taken over 100 KHz of 2 seconds.
FSR ~ 210.00 MHz, line width ~ 8.56 KHz, Finesse ~ 24 500 .
|
| Attachment 1: 20220706_Setup.jpg
|
 |
| Attachment 2: Screenshot_2022-07-06_1_181116.png
|
 |
| Attachment 3: Finesse_Fit.jpg
|
 |
| Attachment 4: 00mode.jpg
|
 |
| Attachment 5: 00mode_diameter.jpg
|
 |
|
109
|
Fri Jul 8 17:48:48 2022 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | Optical room | 2 Mirror Setup @ 216.6 MHz |
The cavity was realigned using irises instead of pinholes, gave a better alignment.
The inside of the box, the spherical and the injection mirror were cleaned and placed back inside the box.
we see beating of fundamental mode, previously at the transmission point we placed a wedge to split the beam which resulted in an elliptical mode
we removed it and placed a very thin beam splitter, the beam is circular now.
The cavity was locked in air at a coupling of ~ 60-70 %
Finesse and line width measured five readings with a Finesse average 25095.08884 of a Gain ~ 8000
FWHM (KHz) = 8.2928
Finesse = 25323.0544
FWHM (KHz) = 7.9202
Finesse = 26514.4395
FWHM (KHz) = 8.5834
Finesse = 24465.8636
FWHM (KHz) = 8.4571
Finesse = 24831.2419
FWHM (KHz) = 8.6275
Finesse = 24340.8448
Theoretical and expected Finesse for the 2 mirror setup with the losses is calculated by Ronic for comparison between four and 2 mirror setup.
| Manar Amer wrote: |
|
The SBox cavity setup was changed to have only 2 mirrors M1 plane and M2 spherical, both from ThomX
Distance between the mirror ~ 72 cm , increased from 70 cm to take into account the thickness of the ThomX mirrors
Two lenses (300 mm @ 50 cm , 200 @ 104 cm) were placed to have the beam radius ~ 0.55 mm.
The cavity was locked with a coupling of 60 %, for Finesse measurement the sweep was taken over 100 KHz of 2 seconds.
FSR ~ 210.00 MHz, line width ~ 8.56 KHz, Finesse ~ 24 500 .
|
|
| Attachment 1: 00mode.jpg
|
 |
| Attachment 2: 00mode_diameter.jpg
|
 |
| Attachment 3: Screenshot_2022-07-08_0_164115.png
|
 |
| Attachment 4: Slide1.JPG
|
 |
| Attachment 5: Slide2.JPG
|
 |
|
110
|
Fri Jul 8 19:37:24 2022 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | Optical room | 2 Mirror Setup @ 216.6 MHz |
Update for Finesse measurement, The cavity was put under vacuum ~ 1.1*10^-1 mbar
and the alignment and coupling improved.
FSR = 210.1 MHz
Average Finesse = 25686.46222
FWHM (KHz) = 8.2387
Finesse = 25501.5659
FWHM (KHz) = 8.2028
Finesse = 25613.2858
FWHM (KHz) = 8.0978
Finesse = 25945.3289
FWHM (KHz) = 8.1744
Finesse = 25702.3142
FWHM (KHz) = 8.1847
Finesse = 25669.8163
Concluded from Ronic's calculations, this could be the maximum finesse we might be able to obtain with this setup
with Gain ~ 8000
On Monday we adjust the frequency to match 2160.66 MHz and lock the Pulsed,
at the same time start we start with the CELIA amplifier.
| Manar Amer wrote: |
|
The cavity was realigned using irises instead of pinholes, gave a better alignment.
The inside of the box, the spherical and the injection mirror were cleaned and placed back inside the box.
we see beating of fundamental mode, previously at the transmission point we placed a wedge to split the beam which resulted in an elliptical mode
we removed it and placed a very thin beam splitter, the beam is circular now.
The cavity was locked in air at a coupling of ~ 60-70 %
Finesse and line width measured five readings with a Finesse average 25095.08884 of a Gain ~ 8000
FWHM (KHz) = 8.2928
Finesse = 25323.0544
FWHM (KHz) = 7.9202
Finesse = 26514.4395
FWHM (KHz) = 8.5834
Finesse = 24465.8636
FWHM (KHz) = 8.4571
Finesse = 24831.2419
FWHM (KHz) = 8.6275
Finesse = 24340.8448
Theoretical and expected Finesse for the 2 mirror setup with the losses is calculated by Ronic for comparison between four and 2 mirror setup.
| Manar Amer wrote: |
|
The SBox cavity setup was changed to have only 2 mirrors M1 plane and M2 spherical, both from ThomX
Distance between the mirror ~ 72 cm , increased from 70 cm to take into account the thickness of the ThomX mirrors
Two lenses (300 mm @ 50 cm , 200 @ 104 cm) were placed to have the beam radius ~ 0.55 mm.
The cavity was locked with a coupling of 60 %, for Finesse measurement the sweep was taken over 100 KHz of 2 seconds.
FSR ~ 210.00 MHz, line width ~ 8.56 KHz, Finesse ~ 24 500 .
|
|
|
| Attachment 1: Screenshot_2022-07-08_2_182405.png
|
 |
|
111
|
Tue Jul 12 10:07:05 2022 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | Optical room | FSR change & Finesse Measurements |
The FSR of the 2 mirror (plan-spherical) Cavity was adjusted from 210 MHz to reach 216.643 MHz
it was done by having two reference irises, one at the injection point and one at the reflection
then changing the position of injection plan mirror to slightly closer distance and monitoring the reflection on the oscilloscope to be max.
The cavity modes were still seen, and we had to only improve the injection alignment after.
Me and Ronic locked in air and measured the Finesse, which was bigger by ~ 20%
average Finesse = 30208.53614
FWHM (KHz) = 7.0179
Finesse = 30869.9522
FWHM (KHz) = 7.1257
Finesse = 30403.005
FWHM (KHz) = 7.1287
Finesse = 30390.4014
FWHM (KHz) = 7.2884
Finesse = 29724.5531
FWHM (KHz) = 7.3055
Finesse = 29654.769
| Manar Amer wrote: |
|
Update for Finesse measurement, The cavity was put under vacuum ~ 1.1*10^-1 mbar
and the alignment and coupling improved.
FSR = 210.1 MHz
Average Finesse = 25686.46222
FWHM (KHz) = 8.2387
Finesse = 25501.5659
FWHM (KHz) = 8.2028
Finesse = 25613.2858
FWHM (KHz) = 8.0978
Finesse = 25945.3289
FWHM (KHz) = 8.1744
Finesse = 25702.3142
FWHM (KHz) = 8.1847
Finesse = 25669.8163
Concluded from Ronic's calculations, this could be the maximum finesse we might be able to obtain with this setup
with Gain ~ 8000
On Monday we adjust the frequency to match 2160.66 MHz and lock the Pulsed,
at the same time start we start with the CELIA amplifier.
| Manar Amer wrote: |
|
The cavity was realigned using irises instead of pinholes, gave a better alignment.
The inside of the box, the spherical and the injection mirror were cleaned and placed back inside the box.
we see beating of fundamental mode, previously at the transmission point we placed a wedge to split the beam which resulted in an elliptical mode
we removed it and placed a very thin beam splitter, the beam is circular now.
The cavity was locked in air at a coupling of ~ 60-70 %
Finesse and line width measured five readings with a Finesse average 25095.08884 of a Gain ~ 8000
FWHM (KHz) = 8.2928
Finesse = 25323.0544
FWHM (KHz) = 7.9202
Finesse = 26514.4395
FWHM (KHz) = 8.5834
Finesse = 24465.8636
FWHM (KHz) = 8.4571
Finesse = 24831.2419
FWHM (KHz) = 8.6275
Finesse = 24340.8448
Theoretical and expected Finesse for the 2 mirror setup with the losses is calculated by Ronic for comparison between four and 2 mirror setup.
| Manar Amer wrote: |
|
The SBox cavity setup was changed to have only 2 mirrors M1 plane and M2 spherical, both from ThomX
Distance between the mirror ~ 72 cm , increased from 70 cm to take into account the thickness of the ThomX mirrors
Two lenses (300 mm @ 50 cm , 200 @ 104 cm) were placed to have the beam radius ~ 0.55 mm.
The cavity was locked with a coupling of 60 %, for Finesse measurement the sweep was taken over 100 KHz of 2 seconds.
FSR ~ 210.00 MHz, line width ~ 8.56 KHz, Finesse ~ 24 500 .
|
|
|
|
| Attachment 1: 00mode.jpg
|
 |
| Attachment 2: 00mode_diameter.jpg
|
 |
| Attachment 3: 00mode_diameter_fit.jpg
|
 |
|
112
|
Tue Jul 12 10:19:30 2022 |
Manar Amer | Fixed | report | lasers and optics | detectors and electronics | Optical room | FSR change & Finesse Measurements |
Yesterday evening the cavity was Vacuum pumped up to pressure of 5.5*10^-2 and locked
changed FSR to be 216.662 MHz and alignment a little and measured the Finesse
in Vacuum we have average Finesse = 30341.6265
FWHM (KHz) = 7.0592
Finesse = 30692.1961
FWHM (KHz) = 7.2186
Finesse = 30014.556
FWHM (KHz) = 7.1051
Finesse = 30493.7635
FWHM (KHz) = 7.1079
Finesse = 30481.9812
FWHM (KHz) = 7.1413
Finesse = 30339.2695
FWHM (KHz) = 7.1624
Finesse = 30249.776
FWHM (KHz) = 7.0239
Finesse = 30846.2719
FWHM (KHz) = 7.2614
Finesse = 29837.6477
FWHM (KHz) = 7.1935
Finesse = 30119.1768
| Manar Amer wrote: |
|
The FSR of the 2 mirror (plan-spherical) Cavity was adjusted from 210 MHz to reach 216.643 MHz
it was done by having two reference irises, one at the injection point and one at the reflection
then changing the position of injection plan mirror to slightly closer distance and monitoring the reflection on the oscilloscope to be max.
The cavity modes were still seen, and we had to only improve the injection alignment after.
Me and Ronic locked in air and measured the Finesse, which was bigger by ~ 20%
average Finesse = 30208.53614
FWHM (KHz) = 7.0179
Finesse = 30869.9522
FWHM (KHz) = 7.1257
Finesse = 30403.005
FWHM (KHz) = 7.1287
Finesse = 30390.4014
FWHM (KHz) = 7.2884
Finesse = 29724.5531
FWHM (KHz) = 7.3055
Finesse = 29654.769
| Manar Amer wrote: |
|
Update for Finesse measurement, The cavity was put under vacuum ~ 1.1*10^-1 mbar
and the alignment and coupling improved.
FSR = 210.1 MHz
Average Finesse = 25686.46222
FWHM (KHz) = 8.2387
Finesse = 25501.5659
FWHM (KHz) = 8.2028
Finesse = 25613.2858
FWHM (KHz) = 8.0978
Finesse = 25945.3289
FWHM (KHz) = 8.1744
Finesse = 25702.3142
FWHM (KHz) = 8.1847
Finesse = 25669.8163
Concluded from Ronic's calculations, this could be the maximum finesse we might be able to obtain with this setup
with Gain ~ 8000
On Monday we adjust the frequency to match 2160.66 MHz and lock the Pulsed,
at the same time start we start with the CELIA amplifier.
| Manar Amer wrote: |
|
The cavity was realigned using irises instead of pinholes, gave a better alignment.
The inside of the box, the spherical and the injection mirror were cleaned and placed back inside the box.
we see beating of fundamental mode, previously at the transmission point we placed a wedge to split the beam which resulted in an elliptical mode
we removed it and placed a very thin beam splitter, the beam is circular now.
The cavity was locked in air at a coupling of ~ 60-70 %
Finesse and line width measured five readings with a Finesse average 25095.08884 of a Gain ~ 8000
FWHM (KHz) = 8.2928
Finesse = 25323.0544
FWHM (KHz) = 7.9202
Finesse = 26514.4395
FWHM (KHz) = 8.5834
Finesse = 24465.8636
FWHM (KHz) = 8.4571
Finesse = 24831.2419
FWHM (KHz) = 8.6275
Finesse = 24340.8448
Theoretical and expected Finesse for the 2 mirror setup with the losses is calculated by Ronic for comparison between four and 2 mirror setup.
| Manar Amer wrote: |
|
The SBox cavity setup was changed to have only 2 mirrors M1 plane and M2 spherical, both from ThomX
Distance between the mirror ~ 72 cm , increased from 70 cm to take into account the thickness of the ThomX mirrors
Two lenses (300 mm @ 50 cm , 200 @ 104 cm) were placed to have the beam radius ~ 0.55 mm.
The cavity was locked with a coupling of 60 %, for Finesse measurement the sweep was taken over 100 KHz of 2 seconds.
FSR ~ 210.00 MHz, line width ~ 8.56 KHz, Finesse ~ 24 500 .
|
|
|
|
|
| Attachment 1: Screenshot_2022-07-11_1_204143.png
|
 |
| Attachment 2: Screenshot_2022-07-11_0_203646.png
|
 |