Cameras Calibration, posted by Kevin Dupraz at Optical room about lasers and optics | detectors and electronics 
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After check a mistake has been found on the magnification. This seems to be the good calibration (feel free to cross check). The projection of the 2mm
hex is attached
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Calcul Polar, posted by Blanc at Optical room about lasers and optics
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J'ai fait le calcul de la puissance du Tangor qui passait à travers le glan avec 3 hypothèses :
1- Le faisceau est totalement polarisé et le glan est parfait (cf : image 1)
2- Le faisceau est totalement polarisé et le glan est imparfait (cf : image 2) |
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Burst Stacking in cavity, posted by Blanc at Optical room about lasers and optics 7x
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Les trois premières images sont la premières injection d'un burst dans la cavité à 3 instant t. On remarque plusieurs
choses :
- Le burst peut être plus ou moins bien injecté |
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Amplitude GHz oscillator phase noise with PZT effect, posted by Ronic Chiche at Optical room about lasers and optics
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3 phase noise measurements made on the Amplitude GHz oscillator with different PZT configurations :
- black curve: PZT connector is open
- green curve: PZT connector is shorted by 50 ohms |
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Amplitude GHz oscillator phase noise with PZT effect, posted by Ronic Chiche at Optical room about lasers and optics
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Thorlabs PZT datasheet.
Reference: PC4QR
Ronic |
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Alignment using Koheras , posted by Manar Amer at Other about lasers and optics 6x
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Following the Helium Neon Alignment + change in the distance between the mirrors to be; M3-M4 = 90.5 mm , M1-M2 = 80.2 mm -→ The alignment
using the Koheras CW laser is done.
Additional components used:
for monitoring beam : Photodiode (power of beam), Beam Profiler (shape, position, power |
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Alignment using Helium Neon Laser , posted by Manar Amer at Other about lasers and optics
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| 05 April 2021 : A rough alignment of the cavity was done using the Helium Neon Laser. |
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1GHz oscillator Frep measurement, posted by Blanc at Optical room about mechanics | lasers and optics | detectors and electronics
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a previous cavity FSR measurement was giving a center frequency around 867.5MHz.
the present 1GHz oscillator Frep measurement is about 879.888MHz.
the
present shift is about 12.4MHz which is equivalent to move one cavity lenght by 4.3mm which is HUGE !!!
as the 1GHz oscillator does not have any motor,
one has to move the FP cavity mirrors instead.
the PZT inside the 1GHz oscillator (Thorlabs PC4QR) has a dynamic range of (20µm for 150V... we will |
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1GHz oscillator Frep measurement, posted by Blanc at Optical room about mechanics | lasers and optics | detectors and electronics
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The optical spectrum of the GHz oscillator: FWHM ~ 4nm
Blanc
wrote:
a previous cavity FSR measurement was giving a center frequency around 867.5MHz. |