Thermal lensing and the Gingin test 1

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Presentation transcript:

Thermal lensing and the Gingin test 1 Jérôme Degallaix Gingin international workshop October 2005

Presentation of the first test 80 meters long cavity 6W input laser 5kW circulating power Strong thermal lensing Sapphire test mass Diameter: 100 mm Waist size: 8 mm Abs = 50ppm/cm Uniform absoprtion

Effect of thermal lensing Change the apparent ITM Radius Change cavity modes Example: 6W input power, 5kW circulating power Pabsorbed = 2.5 W FITM = 472 m

Presentation of the first test Pcirc Pin Gain = Pcirc / Pin

No thermal lensing

1W input power

2W input power

3W input power

4W input power

5W input power

6W input power

7W input power

8W input power

9W input power

10W input power

Do we need a FFT simulation ? Thermal lensing deformations: non spherical!

Higher order modes comparison

Idea of compensation

HOM spectrum with CP CP works fine for TEM00 Make higher order mode worst!

Problem with the PRC Arm cavity PRC PRC degenerate  Higher order mode resonant! g factor PRC = 0.999995 Frequency separation between HOM f = 10 kHz ( FWHMPRC = 130 kHz )

Make the PRC non degenerate Arm cavity PRC For example: g = 0.995  f = 340 kHz (> 2 * FWHMPRC ) Do not compensate totally thermal lensing fITM = 10 km

Compensation plate works (for TEM00) Need to investigate the behavior of HOM Does not any correct any inhomogeous absorption

Profile of the deformations Thermal lensing deformations: non spherical!

Circulating power comparison

Reflected power

Higher order modes comparison

Higher order modes comparison

4W circulating power profile