1LSC 03/2005 LIGO-G050166-00-Z S. Chelkowski characterization of squeezed states

Experimental characterization of frequency-dependent squeezed light

Simon Chelkowski, Henning Vahlbruch, Boris Hage, Alexander Franzen, Nico Lastzka, Moritz Mehmet, Karsten

Danzmann and Roman Schnabel

Max-Planck-Institut für Gravitationsphysik

Universität Hannover

SFB 407

OPA squeezing

frequency-dependent squeezingInfluence of a cavity

2LSC 03/2005 LIGO-G050166-00-Z S. Chelkowski characterization of squeezed states

OPA squeezing

• MgO:LiNbO3 – crystal as nonlinear material

• strong interaction between seed- and pumpfield

• fractions in phase are amplified

OPA squeezing

frequency-dependent squeezingInfluence of a cavity

Parametric amplification

3LSC 03/2005 LIGO-G050166-00-Z S. Chelkowski characterization of squeezed states

simple explanation of how to generate squeezing

OPA squeezing

frequency-dependent squeezingInfluence of a cavity

4LSC 03/2005 LIGO-G050166-00-Z S. Chelkowski characterization of squeezed states

detection of squeezing

• 50/50 beamsplitter

• signal amplification due to overlapping of a strong local oscillator• phasesensitive measurement

homodyne detection

OPA squeezing

frequency-dependent squeezingInfluence of a cavity

5LSC 03/2005 LIGO-G050166-00-Z S. Chelkowski characterization of squeezed states

squeezing spectrum

• amplitude squeezing at

• squeezed noise

below vacuum noisedark noise

vacuum noise

Broardband squeezing up to ~30MHz

Relaxiation oszillation

OPA squeezing

frequency-dependent squeezingInfluence of a cavity

6LSC 03/2005 LIGO-G050166-00-Z S. Chelkowski characterization of squeezed states

reflection at a cavity & quadrature picture

amplitude quadrature

phasen quadraturearbitrary Quadratur

locked at

OPA Squeezing

frequency-dependent squeezingInfluence of a cavity

7LSC 03/2005 LIGO-G050166-00-Z S. Chelkowski characterization of squeezed states

reflection at a cavity & quadrature picture

Influence of a detuned Cavity

OPA squeezing

frequency-dependent squeezingInfluence of a cavity

8LSC 03/2005 LIGO-G050166-00-Z S. Chelkowski characterization of squeezed states

creation of frequency-dependent squeezing

PRA 71, 013806 (2005)

OPA squeezing

frequency-dependent squeezingInfluence of a cavity

9LSC 03/2005 LIGO-G050166-00-Z S. Chelkowski characterization of squeezed states

motivation of the experiment

OPA squeezing

frequency-dependent squeezingInfluence of a cavity

10LSC 03/2005 LIGO-G050166-00-Z S. Chelkowski characterization of squeezed states

creation of frequency-dependent squeezing

PRA 71, 013806 (2005)

OPA squeezing

frequency-dependent squeezingInfluence of a cavity

11LSC 03/2005 LIGO-G050166-00-Z S. Chelkowski characterization of squeezed states

frequency-dependent squeezing

PRA 71, 013806 (2005)

OPA squeezing

frequency-dependent squeezingInfluence of a cavity

12LSC 03/2005 LIGO-G050166-00-Z S. Chelkowski characterization of squeezed states

tomography of a squeezed state

Contour Plot of a Wigner Function

PRA 71, 013806 (2005)

14.1MHz

OPA squeezing

frequency-dependent squeezingInfluence of a cavity

13LSC 03/2005 LIGO-G050166-00-Z S. Chelkowski characterization of squeezed states

tomography of frequency-dependent squeezed light

PRA 71, 013806 (2005)

OPA squeezing

frequency-dependent squeezingInfluence of a cavity

14LSC 03/2005 LIGO-G050166-00-Z S. Chelkowski characterization of squeezed states

evolution of the squeezing angle

PRA 71, 013806 (2005)

OPA squeezing

frequency-dependent squeezingInfluence of a cavity

15LSC 03/2005 LIGO-G050166-00-Z S. Chelkowski characterization of squeezed states

conclusion

OPA Squeezing (non-linear process, MgO:LiNbO3-crystal)

creation of frequency-dependent squeezing

(reflection at a cavity)

results(freq.dep. light, tomography of squeezed states)

OPA squeezing

frequency-dependent squeezingInfluence of a cavity