1. Optical Squeezing For Next Generation Interferometric Gravitational Wave Detectors
Michael Stefszky, Sheon Chua, Conor Mow-Lowry, Ben Buchler, Kirk McKenzie, Sheila Dwyer, Ping Koy Lam & David McClelland

2. Project Aim
D. Sigg

3. Ball on Stick Diagram Squeezed State “Perfect” Quantum Laser
Amplitude
Squeezed State
“Perfect” Quantum Laser
Perfect Classical Laser

4. The Optical Parametric Oscillator (OPO)
ω+ε 2ω
Residual Pump
Pump
Squeezing!
ω- ε
Down-conversion Process

5. The Real Thing
To LIGO
Nonlinear Crystal

6. Homodyne Detector Photo Detectors 50:50 Vacuum Field Local Oscillator
Subtractor
50:50
Vacuum Field
Local Oscillator

7. Squeezer Performance Shot Noise Squeezing Requirement Shot Noise
dBm/Hz [Rel. To SNL]
6dB
Squeezing Requirement
Frequency (Hz)

8. Measuring Squeezing 50:50 Vacuum Field Squeezed Field Local Oscillator
Subtractor
50:50
Vacuum Field
Squeezed Field
Local Oscillator

9. Squeezer Performance 6 dB Shot Noise Squeezing dBm/Hz [Rel. To SNL]
Frequency (Hz)

10. Injection into LIGO 50:50 Squeezed Field Vacuum Field Signal
Local Oscillator
ACGRG5 10

11. Results/Future Directions
Required squeezing level has been achieved
Currently removing degradation at low frequencies
Investigate long-term stability of system
Deliver to LIGO!!!

12. Thanks

13. Squeezing Enhancement
K. McKenzie, D. A. Shaddock, D. E. McClelland
Experimental Demonstration with Power-Recycled Michelson Interferometer for Gravitational Wave Detection