Optical whispering gallery AndPI презентация

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1. Optical whispering gallery AndPI
2. Single mode cavity to avoid paramentic instability
3. Single mode cavity to avoid parametric

Single mode cavity to avoid paramentic instability in ET Exiting elastic and Stokes mode. Threshold effect. Frequency sinchronizm Too many possible optic Stokes modes to participate in PI Solution: to thin

Слайд 1Optical whispering gallery mini-cavities for the determination of optical absorption, scattering

and acoustical losses in crystalline materials for future detectors.

A diamond lathe machine (designed for contact lens industry) allows to prepare samples with sub-nanometer resolution.

Coupling to high refractive WGM is challenging. Semisphere coupler from the same material (Si) is a solution.

Proof of the feasibility: Q=3x106 and coupling >10% is demonstrated on Si ball cavity (Q>1x108 for CaF2 disk cavity made by the lathe machine).

Слайд 2Single mode cavity to avoid paramentic instability in ET
Exiting elastic and

Stokes mode. Threshold effect.
Frequency sinchronizm
Too many possible optic Stokes modes to participate in PI

Solution: to thin out cavity spectrum
Mirror's profile – not pure spheric.
Intensity profile on mirror slightly differ from Gaussian:

Слайд 3Single mode cavity to avoid parametric instability in ET (cont.) Results:

Diffraction loss

of Main mode
< 5 ppm
Losses of high order modes are larger 1000 ppm or even 10 000 ppm

Only one or two optic modes may participate in parametric instability

$Single mode cavity to avoid parametric instability in ET (cont.) Results:Diffraction loss of Main mode$

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Optical whispering gallery AndPI презентация

Содержание

Слайд 1Optical whispering gallery mini-cavities for the determination of optical absorption, scattering

Слайд 2Single mode cavity to avoid paramentic instability in ET
Exiting elastic and

Слайд 3Single mode cavity to avoid parametric instability in ET (cont.) Results:

Diffraction loss

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Optical whispering gallery AndPI презентация

Содержание

Слайд 1Optical whispering gallery mini-cavities for the determination of optical absorption, scattering

Слайд 2Single mode cavity to avoid paramentic instability in ETExiting elastic and

Слайд 3Single mode cavity to avoid parametric instability in ET (cont.) Results:Diffraction loss

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Слайд 2Single mode cavity to avoid paramentic instability in ET
Exiting elastic and

Слайд 3Single mode cavity to avoid parametric instability in ET (cont.) Results:

Diffraction loss