In situ measurement of absorption in high-power interferometers by using beam diameter measurements

Ottaway, D. J.; Betzwieser, J.; Ballmer, S. W.; Waldman, S. J.; Kells, W.

doi:10.1364/ol.31.000450

Cited by 9 publications

(11 citation statements)

References 5 publications

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“…Furthermore, the filtering experienced by the optical sideband fields is not as simple as might be envisaged by modeling the process by propagation of plane waves . Each of the higher-order transverse modes of the sideband field experiences a different phase shift in the cavities (Ballmer, 2006;. In this way, the final recombined signal depends in a detailed way on the mirror surface perturbations and, as explained in Sec.…”

Section: Local Oscillator Phase Noisementioning

confidence: 94%

“…These will include sources such as stellar collapse leading to supernovae (Ott, 2009), the boiling of the cooling neutron star at the end of the collapse (Liu and Lindblom, 2001), and soft gamma-ray repeaters . The most exciting prospect in making a broadband search for gravitational waves is to make a discovery of an entirely unexpected astrophysical phenomenon (Cutler and Thorne, 2002;Ando et al, 2012).…”

Section: Transientsmentioning

confidence: 99%

“…In order to compensate for this effect, active thermal correction systems were installed to smooth out the thermal gradients (Lück et al, 2004;Lawrence et al, 2004;Ballmer, 2006;Accadia, Swinkels, and V. Collaboration, 2010;Rocchi et al, 2012) as well as to improve the fringe contrast at the antisymmetric port.…”

Section: E Thermal Distortionsmentioning

confidence: 99%

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Gravitational radiation detection with laser interferometry

2014

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Gravitational-wave detection has been pursued relentlessly for over 40 years. With the imminent operation of a new generation of laser interferometers, it is expected that detections will become a common occurrence. The research into more ambitious detectors promises to allow the field to move beyond detection and into the realm of precision science using gravitational radiation. In this article, the state of art for the detectors is reviewed and an outlook for the coming decades is described.

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Section: Local Oscillator Phase Noisementioning

confidence: 94%

Section: Transientsmentioning

confidence: 99%

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Gravitational radiation detection with laser interferometry

2014

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“…Large Michelson interferometers such as GEO 600 working at high optical powers can be used to measure small effects of thermally induced distortion of their optical elements [12]. One of the most sensitive optical components in GEO 600 is the beam splitter which is placed inside a high-finesse cavity: the power-recycling cavity (Figure 1.1).…”

Section: A New Methods For Measuring Bulk Absorptionmentioning

confidence: 99%

Measurement of a low-absorption sample of OH-reduced fused silica

et al. 2006

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Abstract. Low-absorption optics made of OH-reduced fused silica are a key technology for future gravitational wave detectors such as Advanced LIGO. We developed a sensitive method to measure the absorption inside the beam splitter of GEO 600, taking advantage of the effect of thermal lensing. Using this method we derived a bulk absorption of less than 0.25 ppm/cm for a piece of Suprasil 311 SV at a wavelength of 1064 nm. This is the lowest value of light absorption inside fused silica reported so far in the literature.PACS numbers: 04.80. Nn, 95.75.Kk, 95.55.Ym

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“…Such strong thermal lensing will normally cause an interferometer to either severely lose sensitivity or become inoperable [10]. Already, compensation of thermal lensing due to excess absorption in an ITM has been required in the initial LIGO interferometer [17,18]. In that case, a CO 2 laser beam was used to heat the back surface of the ITM to cancel the positive lens produced by absorption.…”

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confidence: 99%

Compensation of Strong Thermal Lensing in High-Optical-Power Cavities

Zhao

Degallaix

et al. 2006

Phys. Rev. Lett.

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In an experiment to simulate the conditions in high optical power advanced gravitational wave detectors, we show for the first time that the time evolution of strong thermal lenses follows the predicted infinite sum of exponentials (approximated by a double exponential), and that such lenses can be compensated using an intracavity compensation plate heated on its cylindrical surface. We show that high finesse 1400 can be achieved in cavities with internal compensation plates, and that mode matching can be maintained. The experiment achieves a wave front distortion similar to that expected for the input test mass substrate in the Advanced Laser Interferometer Gravitational Wave Observatory, and shows that thermal compensation schemes are viable. It is also shown that the measurements allow a direct measurement of substrate optical absorption in the test mass and the compensation plate.

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In situ measurement of absorption in high-power interferometers by using beam diameter measurements

Abstract: We present a simple technique to make in situ measurements of the absorption in the optics of high-power laser interferometers. The measurement is particularly useful to those commissioning large-scale high power optical systems.

Cited by 9 publications

References 5 publications

Gravitational radiation detection with laser interferometry

Gravitational radiation detection with laser interferometry

Measurement of a low-absorption sample of OH-reduced fused silica

Compensation of Strong Thermal Lensing in High-Optical-Power Cavities

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