Quantum Noise and Radiation Pressure Effects in High Power Optical Interferometers

In recent years, a variety of mechanical systems have been approaching quantum limits to their sensitivity of continuous position measurements imposed by the Heisenberg Uncertainty Principle. Most notably, gravitational wave interferomters, such as the Laser Interferometer Gravitational wave Observatory (LIGO), operate within a factor of 10 of the standard quantum limit. Here we characterize and manipulate quantum noise in a variety of alternative topologies which may lead to higher sensitivity GW detectors, and also provide an excellent testbed for fundamental quantum mechanics. Techniques considered include injection and generation of non-classical (squeezed) states of light, and cooling and trapping of macroscopic mirror degrees of freedom by manipulation of the optomechanical coupling between radiation pressure and mirror motion. A computational tool is developed to model complex optomechanical systems in which these effects arise. The simulation tool is used to design an apparatus capable of demonstrating a variety of radiation pressure effects, most notably ponderomotive squeezing and the optical spring effect. A series of experiments were performed, designed to approach measurement of these effects. The experiments use a 1 gram mirror to show progressively stronger radiation pressure effects, but only in the classical regime. The most significant result of these experiments is that we use radiation pressure from two optical fields to shift the mechanical resonant frequency of a suspended mirror from 172 Hz to 1.8 kHz, while simultaneously damping its motion. The technique could prove useful in advanced gravitational wave interferometers by easing control issues, and also has the side effect of effectively cooling the mirror by removing its thermal energy. We show that with improvements, the technique may allow the quantum ground state of the mirror to be approached. Finally, we discuss future prospects for approaching quantum effects in the experiments. Thesis Supervisor: Nergis Mavalvala Title: Associate Professor

[1]  N. Mavalvala,et al.  Creation of a quantum oscillator by classical control , 2008, 0809.2024.

[2]  Keisuke Goda,et al.  A quantum-enhanced prototype gravitational-wave detector , 2008, 0802.4118.

[3]  D. McClelland,et al.  Cooling of a Gram-Scale Cantilever Flexure to 70 mK with a Servo-Modified Optical Spring. , 2008, Physical review letters.

[4]  S. Girvin,et al.  Strong dispersive coupling of a high-finesse cavity to a micromechanical membrane , 2007, Nature.

[5]  Karsten Danzmann,et al.  Observation of squeezed light with 10-dB quantum-noise reduction. , 2007, Physical review letters.

[6]  Karsten Danzmann,et al.  Entanglement of macroscopic test masses and the standard quantum limit in laser interferometry. , 2007, Physical review letters.

[7]  Analysis of parametric oscillatory instability in signal recycled LIGO interferometer , 2005, 2008 4th International Conference on Advanced Optoelectronics and Lasers.

[8]  Sarah F. Ackley,et al.  Construction and characterization of a universally tunable modulator , 2008 .

[9]  Sylvain Gigan,et al.  Ground-state cooling of a micromechanical oscillator: Comparing cold damping and cavity-assisted cooling schemes , 2007, 0705.1728.

[10]  Daniel Sigg,et al.  Optical dilution and feedback cooling of a gram-scale oscillator to 6.9 mK. , 2007, Physical review letters.

[11]  D. Rugar,et al.  Feedback cooling of a cantilever's fundamental mode below 5 mK. , 2007, Physical review letters.

[12]  Edith Innerhofer,et al.  An all-optical trap for a gram-scale mirror. , 2006, Physical review letters.

[13]  K. Vahala,et al.  Radiation Pressure Cooling of a Micromechanical Oscillator Using Dynamical Backaction , 2006, 2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference.

[14]  J. G. Harris,et al.  Stable, mode-matched, medium-finesse optical cavity incorporating a microcantilever mirror: optical characterization and laser cooling. , 2006, The Review of scientific instruments.

[15]  Dirk Bouwmeester,et al.  Sub-kelvin optical cooling of a micromechanical resonator , 2006, Nature.

[16]  A. Clerk,et al.  Cooling a nanomechanical resonator with quantum back-action , 2006, Nature.

[17]  T. Briant,et al.  Radiation-pressure cooling and optomechanical instability of a micromirror , 2006, Nature.

[18]  S. Gigan,et al.  Self-cooling of a micromirror by radiation pressure , 2006, Nature.

[19]  Karsten Danzmann,et al.  Coherent control of vacuum squeezing in the gravitational-wave detection band. , 2006, Physical review letters.

[20]  D. Sigg,et al.  Optical torques in suspended Fabry Perot interferometers , 2006 .

[21]  Robert W. Taylor,et al.  Measurement of optical response of a detuned resonant sideband extraction gravitational wave detector , 2006, gr-qc/0604078.

[22]  N. Mavalvala,et al.  Mechanical loss of laser-welded fused silica fibers , 2006 .

[23]  N. Mavalvala,et al.  Measurement of radiation-pressure-induced optomechanical dynamics in a suspended Fabry-Perot cavity , 2005, gr-qc/0511022.

[24]  F. Khalili,et al.  Squeezed-state source using radiation-pressure-induced rigidity (14 pages) , 2005, gr-qc/0511001.

[25]  Karsten Danzmann,et al.  Demonstration of a squeezed-light-enhanced power- and signal-recycled Michelson interferometer. , 2005, Physical review letters.

[26]  K. Vahala,et al.  Radiation-pressure induced mechanical oscillation of an optical microcavity , 2005, EQEC '05. European Quantum Electronics Conference, 2005..

[27]  D. Blair,et al.  Parametric instabilities and their control in advanced interferometer gravitational-wave detectors. , 2005, Physical review letters.

[28]  N. Mavalvala,et al.  Mathematical framework for simulation of quantum fields in complex interferometers using the two-photon formalism , 2005, quant-ph/0502088.

[29]  Karsten Danzmann,et al.  Experimental characterization of frequency-dependent squeezed light , 2005, 0706.4479.

[30]  Khaled Karrai,et al.  Cavity cooling of a microlever , 2004, Nature.

[31]  David E. McClelland,et al.  Observation and characterization of an optical spring , 2004 .

[32]  N. Mavalvala,et al.  Optical cavities as amplitude filters for squeezed fields , 2004, gr-qc/0403028.

[33]  S. Ballmer,et al.  Se p 20 03 Detector Description and Performance for the First Coincidence Observations between LIGO and GEO The LIGO Scientific Collaboration , 2008 .

[34]  J. Rollins Intensity stabilization of a solid-state laser for interferometric gravitational wave detectors , 2004 .

[35]  R. Schilling,et al.  Frequency domain interferometer simulation with higher-order spatial modes , 2003, gr-qc/0309012.

[36]  Samuel L. Braunstein,et al.  Quantum-state transfer from light to macroscopic oscillators , 2003 .

[37]  Thomas Corbitt,et al.  Quantum noise in gravitational wave interferometers: an overview and recent developments , 2003, SPIE International Symposium on Fluctuations and Noise.

[38]  R. Schnabel,et al.  Squeezed-input, optical-spring, signal-recycled gravitational-wave detectors , 2003, gr-qc/0303066.

[39]  Peter Fritschel,et al.  Second generation instruments for the Laser Interferometer Gravitational Wave Observatory (LIGO) , 2003, SPIE Astronomical Telescopes + Instrumentation.

[40]  N. Mavalvala,et al.  Quantum noise in laser-interferometer gravitational-wave detectors with a heterodyne readout scheme , 2003, gr-qc/0302041.

[41]  Christoph Simon,et al.  Towards quantum superpositions of a mirror , 2004 .

[42]  A. Buonanno,et al.  Scaling law in signal recycled laser-interferometer gravitational-wave detectors , 2002, gr-qc/0208048.

[43]  Yanbei Chen,et al.  Practical speed meter designs for quantum nondemolition gravitational-wave interferometers , 2002, gr-qc/0208049.

[44]  P. Purdue Analysis of a quantum nondemolition speed-meter interferometer , 2002 .

[45]  D. McClelland,et al.  Experimental demonstration of a squeezing-enhanced power-recycled michelson interferometer for gravitational wave detection. , 2002, Physical review letters.

[46]  M. Fejer,et al.  Thermal noise in interferometric gravitational wave detectors due to dielectric optical coatings , 2001, gr-qc/0109073.

[47]  V. Giovannetti,et al.  Entangling macroscopic oscillators exploiting radiation pressure. , 2001, Physical review letters.

[48]  R. Abbott,et al.  CONTROL SYSTEM DESIGN FOR THE LIGO PRE-STABILIZED LASER , 2001, physics/0111155.

[49]  S. Strigin,et al.  Parametric oscillatory instability in Fabry-Perot interferometer , 2001, gr-qc/0107079.

[50]  LIGO End-to-End simulation Program , 2001 .

[51]  A. Buonanno,et al.  Quantum noise in second generation, signal recycled laser interferometric gravitational wave detectors , 2001, gr-qc/0102012.

[52]  Berkeley,et al.  Conversion of conventional gravitational-wave interferometers into quantum nondemolition interferometers by modifying their input and/or output optics , 2000, gr-qc/0008026.

[53]  G. Gonz'alez Suspensions thermal noise in the LIGO gravitational wave detector , 2000, gr-qc/0006053.

[54]  M. Blencowe,et al.  Quantum squeezing of mechanical motion for micron-sized cantilevers , 2000 .

[55]  F. Khalili,et al.  Dual-resonator speed meter for a free test mass , 1999, gr-qc/9906108.

[56]  David E. McClelland,et al.  Optimization and transfer of vacuum squeezing from an optical parametric oscillator , 1999 .

[57]  V. Braginsky,et al.  Low noise rigidity in quantum measurements , 1999 .

[58]  P. Cohadon,et al.  Cooling of a Mirror by Radiation Pressure , 1999, quant-ph/9903094.

[59]  B. Allen,et al.  Detecting a stochastic background of gravitational radiation: Signal processing strategies and sensitivities , 1997, gr-qc/9710117.

[60]  S. Rowan,et al.  THE DETECTION OF GRAVITATIONAL WAVES , 1999 .

[61]  S. Schiller,et al.  Generation of strongly squeezed continuous-wave light at 1064 nm. , 1998, Optics express.

[62]  S. Mancini,et al.  Optomechanical Cooling of a Macroscopic Oscillator by Homodyne Feedback , 1998, quant-ph/9802034.

[63]  M. Gorodetsky,et al.  Optical bars in gravitational wave antennas , 1997 .

[64]  P. Knight,et al.  Preparation of nonclassical states in cavities with a moving mirror , 1997, quant-ph/9708002.

[65]  V. Pereira,et al.  Quantum Statistics of the Squeezed Vacuum by Measurement of the Density Matrix in the Number State Representation. , 1996, Physical review letters.

[66]  D. Blair,et al.  PARAMETRIC BACK-ACTION EFFECTS IN A HIGH-Q CYROGENIC SAPPHIRE TRANSDUCER , 1996 .

[67]  M. Regehr,et al.  Demonstration of a power-recycled Michelson interferometer with Fabry-Perot arms by frontal modulation. , 1995, Optics letters.

[68]  M. Regehr Signal Extraction and Control for an Interferometric Gravitational Wave Detector. , 1995 .

[69]  Flanagan Sensitivity of the Laser Interferometer Gravitational Wave Observatory to a stochastic background, and its dependence on the detector orientations. , 1993, Physical review. D, Particles and fields.

[70]  C. Caves,et al.  The Detection of Gravitational Waves , 1991 .

[71]  P. Saulson,et al.  Thermal noise in mechanical experiments. , 1990, Physical review. D, Particles and fields.

[72]  Kimble,et al.  Precision measurement beyond the shot-noise limit , 1987 .

[73]  Hall,et al.  Generation of squeezed states by parametric down conversion. , 1986, Physical review letters.

[74]  Mertz,et al.  Observation of squeezed states generated by four-wave mixing in an optical cavity. , 1985, Physical review letters.

[75]  Schumaker,et al.  New formalism for two-photon quantum optics. II. Mathematical foundation and compact notation. , 1985, Physical review. A, General physics.

[76]  Schumaker,et al.  New formalism for two-photon quantum optics. I. Quadrature phases and squeezed states. , 1985, Physical review. A, General physics.

[77]  P. Meystre,et al.  Optical bistability and mirror confinement induced by radiation pressure , 1983 .

[78]  Carlton M. Caves,et al.  Quantum-Mechanical Radiation-Pressure Fluctuations in an Interferometer , 1980 .