Extreme ultraviolet radiation with coherence time greater than 1 s (original) (raw)

• Udem, Th. et al. Optical frequency metrology. Nature 416, 233–237 (2002).
  Article ADS Google Scholar
• Bloom, B. J. et al. An optical lattice clock with accuracy and stability at the 10−18 level. Nature 506, 71–75 (2014).
  Article ADS Google Scholar
• Kessler, T. et al. A sub-40-mHz-linewidth laser based on a Silicon single-crystal optical cavity. Nature Photon. 6, 687–692 (2012).
  Article ADS Google Scholar
• Bishof, M. et al. Optical spectrum analyzer at the atomic quantum projection noise limit. Phys. Rev. Lett. 111, 093604 (2013).
  Article ADS Google Scholar
• Cundiff, S. & Ye, J. Femtosecond optical frequency combs. Rev. Mod. Phys. 75, 325–342 (2003).
  Article ADS Google Scholar
• Attwood, D. T. Soft X-rays and Extreme Ultraviolet Radiation (Cambridge Univ. Press, 2007).
  Google Scholar
• Berengut, J. C. et al. Electron–hole transitions in multiply charged ions for precision laser spectroscopy and searching for variations in α. Phys. Rev. Lett. 106, 210802 (2011).
  Article ADS Google Scholar
• Eyler, E. E. et al. Prospects for precision measurements of atomic helium using direct frequency comb spectroscopy. Eur. Phys. J. D 48, 43–55 (2007).
  Article ADS Google Scholar
• Campbell, C. J. et al. Single-ion nuclear clock for metrology at the 19th decimal place. Phys. Rev. Lett. 108, 120802 (2012).
  Article ADS Google Scholar
• Herrmann, M. et al. Feasibility of coherent XUV spectroscopy on the 1S–2S transition in singly ionized helium. Phys. Rev. A 79, 052505 (2009).
  Article ADS Google Scholar
• Ackermann, W. et al. Operation of a free-electron laser from the extreme ultraviolet to the water window. Nature Photon. 1, 336–342 (2007).
  Article ADS Google Scholar
• Young, L. et al. Femtosecond electronic response of atoms to ultra-intense X-rays. Nature 466, 56–61 (2010).
  Article ADS Google Scholar
• Emma, P. et al. First lasing and operation of an Ångstrom-wavelength free-electron laser. Nature Photon. 4, 641–647 (2010).
  Article ADS Google Scholar
• Suckewer, S. & Skinner, C. Soft X-ray lasers and their applications. Science 247, 1553–1557 (1990).
  Article ADS Google Scholar
• Bellini, M. et al. Temporal coherence of ultrashort high-order harmonic pulses. Phys. Rev. Lett. 81, 297–300 (1989).
  Article ADS Google Scholar
• Cingöz, A. et al. Direct frequency comb spectroscopy in the extreme ultraviolet. Nature 482, 68–71 (2012).
  Article ADS Google Scholar
• Yost, D. C. et al. Power optimization of XUV frequency combs for spectroscopy applications. Opt. Express 19, 23483–23493 (2011).
  Article ADS Google Scholar
• Kandula, D. Z. et al. Extreme ultraviolet frequency comb metrology. Phys. Rev. Lett. 105, 063001 (2010).
  Article ADS Google Scholar
• Morgenweg, J. et al. Ramsey-comb spectroscopy with intense ultrashort laser pulses. Nature Phys. 10, 30–33 (2013).
  Article ADS Google Scholar
• Jones, R. J. et al. Phase-coherent frequency combs in the vacuum ultraviolet via high-harmonic generation inside a femtosecond enhancement cavity. Phys. Rev. Lett. 94, 193201 (2005).
  Article ADS Google Scholar
• Gohle, C. et al. A frequency comb in the extreme ultraviolet. Nature 436, 234–237 (2005).
  Article ADS Google Scholar
• Mills, A. et al. XUV frequency combs via femtosecond enhancement cavities. J. Phys. B. 45, 142001 (2012).
  Article ADS Google Scholar
• Jones, R. J. & Ye, J. Femtosecond pulse amplification by coherent addition in a passive optical cavity. Opt. Lett. 27, 1848–1850 (2002).
  Article ADS Google Scholar
• Ruehl, A. et al. 80 W, 120 fs Yb-fiber frequency comb. Opt. Lett. 35, 3015–3017 (2010).
  Article ADS Google Scholar
• Allison, T. K. et al. Extreme nonlinear optics in a femtosecond enhancement cavity. Phys. Rev. Lett. 107, 193903 (2011).
  Article Google Scholar
• Carlson, D. R. et al. Intracavity ionization and pulse formation in femtosecond enhancement cavities. Opt. Lett. 36, 2991–2993 (2011).
  Article ADS Google Scholar
• Vidal-Dasilva, M. et al. Electron-beam deposited boron coatings for the extreme ultraviolet. Appl. Opt. 47, 2926–2930 (2008).
  Article ADS Google Scholar
• Walls, F. L. & Demarchi, A. RF spectrum of a signal after frequency multiplication; measurement and comparison with a simple calculation. IEEE Trans. Instrum. Meas. 24, 210–217 (1975).
  Article Google Scholar
• Hall, J. L. in Proceedings of the International School of Physics—Enrico Fermi (eds Arimondo, E., Phillips, W. D. & Strumia, F.) 671–702 (North-Holland, 1992).
  Google Scholar
• Telle, H. R. in Frequency Control of Semiconductor Lasers (eds. Ohtsu, M.) 137–167 (Wiley, 1996).
  Google Scholar
• Schibli, T. R. et al. Optical frequency comb with sub-millihertz linewidth and more than 10 W average power. Nature Photon. 2, 355–359 (2008).
  Article ADS Google Scholar
• Yost, D. C. et al. Vacuum-ultraviolet frequency combs from below-threshold harmonics. Nature Phys. 5, 815–820 (2009).
  Article ADS Google Scholar
• Lewenstein, M. et al. Phase of the atomic polarization in high-order harmonic generation. Phys. Rev. A 52, 4747–4754 (1995).
  Article ADS Google Scholar
• Zaïr, A. et al. Quantum path interferences in high-order harmonic generation. Phys. Rev. Lett. 100, 143902 (2008).
  Article ADS Google Scholar
• Corsi, C. et al. Direct interferometric measurement of the atomic dipole phase in high-order harmonic generation. Phys. Rev. Lett. 97, 023901 (2006).
  Article ADS Google Scholar
• Mairesse, Y. et al. Attosecond synchronization of high-harmonic soft X-rays. Science 302, 1540–1543 (2003).
  Article ADS Google Scholar
• Sansone, G. et al. Measurement of harmonic phase differences by interference of attosecond light pulses. Phys. Rev. Lett. 94, 193903 (2005).
  Article ADS Google Scholar
• Chang, Z. Fundamentals of Attosecond Optics 1st edn (CRC Press, 2011).
  Google Scholar
• Hostetter, J. et al. Semiclassical approaches to below-threshold harmonics. Phys. Rev. A 82, 23401 (2010).
  Article ADS Google Scholar
• Krausz, F. & Ivanov, M. Attosecond physics. Rev. Mod. Phys. 81, 163–234 (2009).
  Article ADS Google Scholar
• Agåker, M. et al. Novel instruments for ultra-soft X-ray emission spectroscopy. Nucl. Instrum. Meth. A 601, 213–219 (2009).
  Article ADS Google Scholar
• Keilmann, F. et al. Time-domain mid-infrared frequency-comb spectrometer. Opt. Lett. 29, 1542–1544 (2004).
  Article ADS Google Scholar
• Hinnen, P. et al. XUV-laser spectroscopy of HD at 92–98 nm. Phys. Rev. A 52, 4425–4433 (1995).
  Article ADS Google Scholar
• Shafir, D. et al. Resolving the time when an electron exits a tunneling barrier. Nature 485, 343–346 (2013).
  Article ADS Google Scholar
• Itatani, J. et al. Tomographic imaging of molecular orbitals. Nature 432, 867–871 (2004).
  Article ADS Google Scholar
• Moll, K. D. et al. Output coupling methods for cavity-based high-harmonic generation. Opt. Express 14, 8189–8197 (2006).
  Article ADS Google Scholar
• Pupeza, I. et al. Compact high-repetition-rate source of coherent 100 eV radiation. Nature Photon. 7, 608–612 (2013).
  Article ADS Google Scholar
• Yost, D. C. et al. Efficient output coupling of intracavity high-harmonic generation. Opt. Lett. 33, 1099–1101 (2008).
  Article ADS Google Scholar
• Lee, J. et al. Optimizing intracavity high harmonic generation for XUV fs frequency combs. Opt. Express 19, 23315–23326 (2011).
  Article ADS Google Scholar
• Carstens, H. et al. Megawatt-scale average-power ultrashort pulses in an enhancement cavity. Opt. Lett. 39, 2595–2598 (2014).
  Article ADS Google Scholar