Abstract

We report on the performance of a dual-wavelength resonant, traveling-wave optical parametric oscillator to generate squeezed light for application in advanced gravitational-wave interferometers. Shot noise suppression of 8.6±0.8dB was measured across the detection band of interest to Advanced LIGO, and controlled squeezing measured over 5900s. Our results also demonstrate that the traveling-wave design has excellent intracavity backscattered light suppression of 47dB and incident backscattered light suppression of 41dB, which is a crucial design issue for application in advanced interferometers.

© 2011 Optical Society of America

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  1. G. M. Harry (for the LIGO Scientific Collaboration), Class. Quantum Grav. 27, 084006 (2010).
    [CrossRef]
  2. J. A. Sidles and D. Sigg, Phys. Lett. A 354, 167 (2006).
    [CrossRef]
  3. C. M. Caves, Phys. Rev. D 23, 1693 (1981).
    [CrossRef]
  4. D. E. McClelland, N. Mavalvala, Y. Chen, and R. Schnabel, Laser Photon. Rev. 5, 677 (2011).
    [CrossRef]
  5. K. McKenzie, D. A. Shaddock, and D. E. McClelland, Phys. Rev. Lett. 88, 231102 (2002).
    [CrossRef] [PubMed]
  6. H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 95, 211102(2005).
    [CrossRef] [PubMed]
  7. K. Goda, O. Miyakawa, E. E. Mikhailov, S. Saraf, R. Adhikari, K. McKenzie, R. Ward, S. Vass, A. J. Weinstein, and N. Mavalvala, Nat. Phys. 4, 472 (2008).
    [CrossRef]
  8. The LIGO Scientific Collaboration, Nat. Phys., doi:10.1038/nphys2083 (to be published).
    [CrossRef]
  9. P. K. Lam, T. C. Ralph, B. C. Buchler, and D. E. McClelland, H.-A. Bachor, and J. Gao, J. Opt. B 1, 469 (1999).
    [CrossRef]
  10. H. Vahlbruch, A. Khalaidovski, N. Lastzka, C. Gräf, K. Danzmann, and Roman Schnabel, Class. Quantum Grav. 27, 084027 (2010).
    [CrossRef]
  11. M. Stefszky, C. M. Mow-Lowry, K. McKenzie, S. Chua, B. C. Buchler, T. Symul, D. E. McClelland, and P. K. Lam, J. Phys. B 44, 015502 (2011).
    [CrossRef]
  12. A. Khalaidovski, H. Vahlbruch, N. Lastzka, C. Graef, K. Danzmann, H. Grote, and R. Schnabel, arXiv:1109.3731v1(2011).
  13. H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Gossler, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 100, 033602 (2008).
    [CrossRef] [PubMed]
  14. K. McKenzie, N. Grosse, W. P. Bowen, S. E. Whitcomb, M. B. Gray, D. E. McClelland, and P. K. Lam, Phys. Rev. Lett. 93, 161105 (2004).
    [CrossRef] [PubMed]
  15. H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 97, 011101(2006).
    [CrossRef] [PubMed]
  16. S. Chua, K. McKenzie, B. C. Buchler, and D. E. McClelland, J. Phys. Conf. Ser. 122, 012023 (2008).
    [CrossRef]
  17. H. Vahlbruch, S. Chelkowski, K. Danzmann, and R. Schnabel, New J. Phys. 9, 371 (2007).
    [CrossRef]
  18. P. Fritschel, LIGO working note T060303-00-D(2006).

2011 (2)

D. E. McClelland, N. Mavalvala, Y. Chen, and R. Schnabel, Laser Photon. Rev. 5, 677 (2011).
[CrossRef]

M. Stefszky, C. M. Mow-Lowry, K. McKenzie, S. Chua, B. C. Buchler, T. Symul, D. E. McClelland, and P. K. Lam, J. Phys. B 44, 015502 (2011).
[CrossRef]

2010 (2)

G. M. Harry (for the LIGO Scientific Collaboration), Class. Quantum Grav. 27, 084006 (2010).
[CrossRef]

H. Vahlbruch, A. Khalaidovski, N. Lastzka, C. Gräf, K. Danzmann, and Roman Schnabel, Class. Quantum Grav. 27, 084027 (2010).
[CrossRef]

2008 (3)

K. Goda, O. Miyakawa, E. E. Mikhailov, S. Saraf, R. Adhikari, K. McKenzie, R. Ward, S. Vass, A. J. Weinstein, and N. Mavalvala, Nat. Phys. 4, 472 (2008).
[CrossRef]

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Gossler, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

S. Chua, K. McKenzie, B. C. Buchler, and D. E. McClelland, J. Phys. Conf. Ser. 122, 012023 (2008).
[CrossRef]

2007 (1)

H. Vahlbruch, S. Chelkowski, K. Danzmann, and R. Schnabel, New J. Phys. 9, 371 (2007).
[CrossRef]

2006 (2)

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 97, 011101(2006).
[CrossRef] [PubMed]

J. A. Sidles and D. Sigg, Phys. Lett. A 354, 167 (2006).
[CrossRef]

2005 (1)

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 95, 211102(2005).
[CrossRef] [PubMed]

2004 (1)

K. McKenzie, N. Grosse, W. P. Bowen, S. E. Whitcomb, M. B. Gray, D. E. McClelland, and P. K. Lam, Phys. Rev. Lett. 93, 161105 (2004).
[CrossRef] [PubMed]

2002 (1)

K. McKenzie, D. A. Shaddock, and D. E. McClelland, Phys. Rev. Lett. 88, 231102 (2002).
[CrossRef] [PubMed]

1999 (1)

P. K. Lam, T. C. Ralph, B. C. Buchler, and D. E. McClelland, H.-A. Bachor, and J. Gao, J. Opt. B 1, 469 (1999).
[CrossRef]

1981 (1)

C. M. Caves, Phys. Rev. D 23, 1693 (1981).
[CrossRef]

Adhikari, R.

K. Goda, O. Miyakawa, E. E. Mikhailov, S. Saraf, R. Adhikari, K. McKenzie, R. Ward, S. Vass, A. J. Weinstein, and N. Mavalvala, Nat. Phys. 4, 472 (2008).
[CrossRef]

Bachor, H.-A.

P. K. Lam, T. C. Ralph, B. C. Buchler, and D. E. McClelland, H.-A. Bachor, and J. Gao, J. Opt. B 1, 469 (1999).
[CrossRef]

Bowen, W. P.

K. McKenzie, N. Grosse, W. P. Bowen, S. E. Whitcomb, M. B. Gray, D. E. McClelland, and P. K. Lam, Phys. Rev. Lett. 93, 161105 (2004).
[CrossRef] [PubMed]

Buchler, B. C.

M. Stefszky, C. M. Mow-Lowry, K. McKenzie, S. Chua, B. C. Buchler, T. Symul, D. E. McClelland, and P. K. Lam, J. Phys. B 44, 015502 (2011).
[CrossRef]

S. Chua, K. McKenzie, B. C. Buchler, and D. E. McClelland, J. Phys. Conf. Ser. 122, 012023 (2008).
[CrossRef]

P. K. Lam, T. C. Ralph, B. C. Buchler, and D. E. McClelland, H.-A. Bachor, and J. Gao, J. Opt. B 1, 469 (1999).
[CrossRef]

Caves, C. M.

C. M. Caves, Phys. Rev. D 23, 1693 (1981).
[CrossRef]

Chelkowski, S.

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Gossler, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

H. Vahlbruch, S. Chelkowski, K. Danzmann, and R. Schnabel, New J. Phys. 9, 371 (2007).
[CrossRef]

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 97, 011101(2006).
[CrossRef] [PubMed]

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 95, 211102(2005).
[CrossRef] [PubMed]

Chen, Y.

D. E. McClelland, N. Mavalvala, Y. Chen, and R. Schnabel, Laser Photon. Rev. 5, 677 (2011).
[CrossRef]

Chua, S.

M. Stefszky, C. M. Mow-Lowry, K. McKenzie, S. Chua, B. C. Buchler, T. Symul, D. E. McClelland, and P. K. Lam, J. Phys. B 44, 015502 (2011).
[CrossRef]

S. Chua, K. McKenzie, B. C. Buchler, and D. E. McClelland, J. Phys. Conf. Ser. 122, 012023 (2008).
[CrossRef]

Danzmann, K.

H. Vahlbruch, A. Khalaidovski, N. Lastzka, C. Gräf, K. Danzmann, and Roman Schnabel, Class. Quantum Grav. 27, 084027 (2010).
[CrossRef]

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Gossler, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

H. Vahlbruch, S. Chelkowski, K. Danzmann, and R. Schnabel, New J. Phys. 9, 371 (2007).
[CrossRef]

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 97, 011101(2006).
[CrossRef] [PubMed]

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 95, 211102(2005).
[CrossRef] [PubMed]

A. Khalaidovski, H. Vahlbruch, N. Lastzka, C. Graef, K. Danzmann, H. Grote, and R. Schnabel, arXiv:1109.3731v1(2011).

Franzen, A.

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Gossler, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 97, 011101(2006).
[CrossRef] [PubMed]

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 95, 211102(2005).
[CrossRef] [PubMed]

Fritschel, P.

P. Fritschel, LIGO working note T060303-00-D(2006).

Gao, J.

P. K. Lam, T. C. Ralph, B. C. Buchler, and D. E. McClelland, H.-A. Bachor, and J. Gao, J. Opt. B 1, 469 (1999).
[CrossRef]

Goda, K.

K. Goda, O. Miyakawa, E. E. Mikhailov, S. Saraf, R. Adhikari, K. McKenzie, R. Ward, S. Vass, A. J. Weinstein, and N. Mavalvala, Nat. Phys. 4, 472 (2008).
[CrossRef]

Gossler, S.

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Gossler, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

Graef, C.

A. Khalaidovski, H. Vahlbruch, N. Lastzka, C. Graef, K. Danzmann, H. Grote, and R. Schnabel, arXiv:1109.3731v1(2011).

Gräf, C.

H. Vahlbruch, A. Khalaidovski, N. Lastzka, C. Gräf, K. Danzmann, and Roman Schnabel, Class. Quantum Grav. 27, 084027 (2010).
[CrossRef]

Gray, M. B.

K. McKenzie, N. Grosse, W. P. Bowen, S. E. Whitcomb, M. B. Gray, D. E. McClelland, and P. K. Lam, Phys. Rev. Lett. 93, 161105 (2004).
[CrossRef] [PubMed]

Grosse, N.

K. McKenzie, N. Grosse, W. P. Bowen, S. E. Whitcomb, M. B. Gray, D. E. McClelland, and P. K. Lam, Phys. Rev. Lett. 93, 161105 (2004).
[CrossRef] [PubMed]

Grote, H.

A. Khalaidovski, H. Vahlbruch, N. Lastzka, C. Graef, K. Danzmann, H. Grote, and R. Schnabel, arXiv:1109.3731v1(2011).

Hage, B.

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Gossler, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 97, 011101(2006).
[CrossRef] [PubMed]

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 95, 211102(2005).
[CrossRef] [PubMed]

Harry, G. M.

G. M. Harry (for the LIGO Scientific Collaboration), Class. Quantum Grav. 27, 084006 (2010).
[CrossRef]

Khalaidovski, A.

H. Vahlbruch, A. Khalaidovski, N. Lastzka, C. Gräf, K. Danzmann, and Roman Schnabel, Class. Quantum Grav. 27, 084027 (2010).
[CrossRef]

A. Khalaidovski, H. Vahlbruch, N. Lastzka, C. Graef, K. Danzmann, H. Grote, and R. Schnabel, arXiv:1109.3731v1(2011).

Lam, P. K.

M. Stefszky, C. M. Mow-Lowry, K. McKenzie, S. Chua, B. C. Buchler, T. Symul, D. E. McClelland, and P. K. Lam, J. Phys. B 44, 015502 (2011).
[CrossRef]

K. McKenzie, N. Grosse, W. P. Bowen, S. E. Whitcomb, M. B. Gray, D. E. McClelland, and P. K. Lam, Phys. Rev. Lett. 93, 161105 (2004).
[CrossRef] [PubMed]

P. K. Lam, T. C. Ralph, B. C. Buchler, and D. E. McClelland, H.-A. Bachor, and J. Gao, J. Opt. B 1, 469 (1999).
[CrossRef]

Lastzka, N.

H. Vahlbruch, A. Khalaidovski, N. Lastzka, C. Gräf, K. Danzmann, and Roman Schnabel, Class. Quantum Grav. 27, 084027 (2010).
[CrossRef]

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Gossler, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

A. Khalaidovski, H. Vahlbruch, N. Lastzka, C. Graef, K. Danzmann, H. Grote, and R. Schnabel, arXiv:1109.3731v1(2011).

Mavalvala, N.

D. E. McClelland, N. Mavalvala, Y. Chen, and R. Schnabel, Laser Photon. Rev. 5, 677 (2011).
[CrossRef]

K. Goda, O. Miyakawa, E. E. Mikhailov, S. Saraf, R. Adhikari, K. McKenzie, R. Ward, S. Vass, A. J. Weinstein, and N. Mavalvala, Nat. Phys. 4, 472 (2008).
[CrossRef]

McClelland, D. E.

D. E. McClelland, N. Mavalvala, Y. Chen, and R. Schnabel, Laser Photon. Rev. 5, 677 (2011).
[CrossRef]

M. Stefszky, C. M. Mow-Lowry, K. McKenzie, S. Chua, B. C. Buchler, T. Symul, D. E. McClelland, and P. K. Lam, J. Phys. B 44, 015502 (2011).
[CrossRef]

S. Chua, K. McKenzie, B. C. Buchler, and D. E. McClelland, J. Phys. Conf. Ser. 122, 012023 (2008).
[CrossRef]

K. McKenzie, N. Grosse, W. P. Bowen, S. E. Whitcomb, M. B. Gray, D. E. McClelland, and P. K. Lam, Phys. Rev. Lett. 93, 161105 (2004).
[CrossRef] [PubMed]

K. McKenzie, D. A. Shaddock, and D. E. McClelland, Phys. Rev. Lett. 88, 231102 (2002).
[CrossRef] [PubMed]

P. K. Lam, T. C. Ralph, B. C. Buchler, and D. E. McClelland, H.-A. Bachor, and J. Gao, J. Opt. B 1, 469 (1999).
[CrossRef]

McKenzie, K.

M. Stefszky, C. M. Mow-Lowry, K. McKenzie, S. Chua, B. C. Buchler, T. Symul, D. E. McClelland, and P. K. Lam, J. Phys. B 44, 015502 (2011).
[CrossRef]

K. Goda, O. Miyakawa, E. E. Mikhailov, S. Saraf, R. Adhikari, K. McKenzie, R. Ward, S. Vass, A. J. Weinstein, and N. Mavalvala, Nat. Phys. 4, 472 (2008).
[CrossRef]

S. Chua, K. McKenzie, B. C. Buchler, and D. E. McClelland, J. Phys. Conf. Ser. 122, 012023 (2008).
[CrossRef]

K. McKenzie, N. Grosse, W. P. Bowen, S. E. Whitcomb, M. B. Gray, D. E. McClelland, and P. K. Lam, Phys. Rev. Lett. 93, 161105 (2004).
[CrossRef] [PubMed]

K. McKenzie, D. A. Shaddock, and D. E. McClelland, Phys. Rev. Lett. 88, 231102 (2002).
[CrossRef] [PubMed]

Mehmet, M.

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Gossler, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

Mikhailov, E. E.

K. Goda, O. Miyakawa, E. E. Mikhailov, S. Saraf, R. Adhikari, K. McKenzie, R. Ward, S. Vass, A. J. Weinstein, and N. Mavalvala, Nat. Phys. 4, 472 (2008).
[CrossRef]

Miyakawa, O.

K. Goda, O. Miyakawa, E. E. Mikhailov, S. Saraf, R. Adhikari, K. McKenzie, R. Ward, S. Vass, A. J. Weinstein, and N. Mavalvala, Nat. Phys. 4, 472 (2008).
[CrossRef]

Mow-Lowry, C. M.

M. Stefszky, C. M. Mow-Lowry, K. McKenzie, S. Chua, B. C. Buchler, T. Symul, D. E. McClelland, and P. K. Lam, J. Phys. B 44, 015502 (2011).
[CrossRef]

Ralph, T. C.

P. K. Lam, T. C. Ralph, B. C. Buchler, and D. E. McClelland, H.-A. Bachor, and J. Gao, J. Opt. B 1, 469 (1999).
[CrossRef]

Saraf, S.

K. Goda, O. Miyakawa, E. E. Mikhailov, S. Saraf, R. Adhikari, K. McKenzie, R. Ward, S. Vass, A. J. Weinstein, and N. Mavalvala, Nat. Phys. 4, 472 (2008).
[CrossRef]

Schnabel, R.

D. E. McClelland, N. Mavalvala, Y. Chen, and R. Schnabel, Laser Photon. Rev. 5, 677 (2011).
[CrossRef]

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Gossler, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

H. Vahlbruch, S. Chelkowski, K. Danzmann, and R. Schnabel, New J. Phys. 9, 371 (2007).
[CrossRef]

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 97, 011101(2006).
[CrossRef] [PubMed]

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 95, 211102(2005).
[CrossRef] [PubMed]

A. Khalaidovski, H. Vahlbruch, N. Lastzka, C. Graef, K. Danzmann, H. Grote, and R. Schnabel, arXiv:1109.3731v1(2011).

Schnabel, Roman

H. Vahlbruch, A. Khalaidovski, N. Lastzka, C. Gräf, K. Danzmann, and Roman Schnabel, Class. Quantum Grav. 27, 084027 (2010).
[CrossRef]

Shaddock, D. A.

K. McKenzie, D. A. Shaddock, and D. E. McClelland, Phys. Rev. Lett. 88, 231102 (2002).
[CrossRef] [PubMed]

Sidles, J. A.

J. A. Sidles and D. Sigg, Phys. Lett. A 354, 167 (2006).
[CrossRef]

Sigg, D.

J. A. Sidles and D. Sigg, Phys. Lett. A 354, 167 (2006).
[CrossRef]

Stefszky, M.

M. Stefszky, C. M. Mow-Lowry, K. McKenzie, S. Chua, B. C. Buchler, T. Symul, D. E. McClelland, and P. K. Lam, J. Phys. B 44, 015502 (2011).
[CrossRef]

Symul, T.

M. Stefszky, C. M. Mow-Lowry, K. McKenzie, S. Chua, B. C. Buchler, T. Symul, D. E. McClelland, and P. K. Lam, J. Phys. B 44, 015502 (2011).
[CrossRef]

Vahlbruch, H.

H. Vahlbruch, A. Khalaidovski, N. Lastzka, C. Gräf, K. Danzmann, and Roman Schnabel, Class. Quantum Grav. 27, 084027 (2010).
[CrossRef]

H. Vahlbruch, M. Mehmet, S. Chelkowski, B. Hage, A. Franzen, N. Lastzka, S. Gossler, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 100, 033602 (2008).
[CrossRef] [PubMed]

H. Vahlbruch, S. Chelkowski, K. Danzmann, and R. Schnabel, New J. Phys. 9, 371 (2007).
[CrossRef]

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 97, 011101(2006).
[CrossRef] [PubMed]

H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel, Phys. Rev. Lett. 95, 211102(2005).
[CrossRef] [PubMed]

A. Khalaidovski, H. Vahlbruch, N. Lastzka, C. Graef, K. Danzmann, H. Grote, and R. Schnabel, arXiv:1109.3731v1(2011).

Vass, S.

K. Goda, O. Miyakawa, E. E. Mikhailov, S. Saraf, R. Adhikari, K. McKenzie, R. Ward, S. Vass, A. J. Weinstein, and N. Mavalvala, Nat. Phys. 4, 472 (2008).
[CrossRef]

Ward, R.

K. Goda, O. Miyakawa, E. E. Mikhailov, S. Saraf, R. Adhikari, K. McKenzie, R. Ward, S. Vass, A. J. Weinstein, and N. Mavalvala, Nat. Phys. 4, 472 (2008).
[CrossRef]

Weinstein, A. J.

K. Goda, O. Miyakawa, E. E. Mikhailov, S. Saraf, R. Adhikari, K. McKenzie, R. Ward, S. Vass, A. J. Weinstein, and N. Mavalvala, Nat. Phys. 4, 472 (2008).
[CrossRef]

Whitcomb, S. E.

K. McKenzie, N. Grosse, W. P. Bowen, S. E. Whitcomb, M. B. Gray, D. E. McClelland, and P. K. Lam, Phys. Rev. Lett. 93, 161105 (2004).
[CrossRef] [PubMed]

Class. Quantum Grav. (2)

G. M. Harry (for the LIGO Scientific Collaboration), Class. Quantum Grav. 27, 084006 (2010).
[CrossRef]

H. Vahlbruch, A. Khalaidovski, N. Lastzka, C. Gräf, K. Danzmann, and Roman Schnabel, Class. Quantum Grav. 27, 084027 (2010).
[CrossRef]

J. Opt. B (1)

P. K. Lam, T. C. Ralph, B. C. Buchler, and D. E. McClelland, H.-A. Bachor, and J. Gao, J. Opt. B 1, 469 (1999).
[CrossRef]

J. Phys. B (1)

M. Stefszky, C. M. Mow-Lowry, K. McKenzie, S. Chua, B. C. Buchler, T. Symul, D. E. McClelland, and P. K. Lam, J. Phys. B 44, 015502 (2011).
[CrossRef]

J. Phys. Conf. Ser. (1)

S. Chua, K. McKenzie, B. C. Buchler, and D. E. McClelland, J. Phys. Conf. Ser. 122, 012023 (2008).
[CrossRef]

Laser Photon. Rev. (1)

D. E. McClelland, N. Mavalvala, Y. Chen, and R. Schnabel, Laser Photon. Rev. 5, 677 (2011).
[CrossRef]

Nat. Phys. (1)

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Figures (3)

Fig. 1
Fig. 1

(a) Schematic of the experiment: MAIN and AUX, Nd:YAG lasers; MC, mode cleaning cavity; HD, balanced homodyne detector; SHG, second-harmonic generator; MZ, Mach–Zehnder interferometer; OPO, optical parametric oscillator; M1, flat mirror, R 1064 nm = 0.84 and R 532 nm = 0.72 ; M2, flat mirror, dual-wavelength high reflectivity coated R > 0.999 ; M3 and M4, ROC = 38 mm , dual-wavelength high reflectivity coated; PD, photodiodes; PZT, piezoelectric transducers; analyzer, Stanford Research Systems 785 m or National Instruments NI4464; RV, reverse OPO field; B, movable beam stops; VA, variable optical attenuator; DBS, dichroic beam splitter; polarization, modulation and control electronic components omitted for clarity. B1 and B2 are shown in position for squeezing measurement, and moved for the OPO backscattered light suppression measurement. (b) Phase modulation sideband diagrams referenced to beam paths in the schematic are discussed in detail within the text.

Fig. 2
Fig. 2

(a) Broadband spectrum of 8.6 ± 0.8 dB squeezed noise [trace (A)], below shot noise [trace (B)] across the GW audio detection band. Traces (C) and (D) are antisqueezed noise and electronic dark noise, respectively. The squeeze angle was locked using the modified coherent locking technique. Electronic dark noise is not subtracted from the other traces (b) Measurement of squeezing at 200 and 500 Hz Fourier frequency over 5900 s , with 7.5 ± 0.2 dB of squeezing broadly measured. The peaks present in the 200 Hz trace are low-frequency glitches.

Fig. 3
Fig. 3

OPO intracavity reverse-to-forward mode backscatter reflection suppression, showing a slope of 2.3 × 10 5 or 47 dB of suppression. Error bars indicate measurement uncertainties.

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