Alumni

Current research / employment

Short abstract of IMPRS PhD project:

This work describes the development of ultranarrow linewidth light sources at λ = 946 nm which have extremely high frequency stability. These light sources have been frequency quadru¬pled to apply as the local oscillator for an optical frequency standard based on laser cooled, trapped single In+ ion in the ultraviolet. A monolithic isolated single mode end-pumped ring Nd:YAG laser and a commercially available external cavity diode laser (ECDL) are implemented as the light sources. The diode laser is locked to a novel-designed vibration-insensitive, ultra¬high finesse Fabry-Perot cavity. We performed, for the first time, an optical "three-cornered-¬hat" measurement to determine the absolute stability of each individual source. Measure¬ments demonstrate that the vibration-insensitive cavity has good frequency stability over the entire measurement time from 100μs to 200 s, even without additional vibration isolation. The abso¬lute, correlation-removed Allan deviation of this cavity is determined to be 1.4 × 10−15 at 1 s, corresponding to a frequency uncertainty of only 0.44 Hz.


Publications Y. N. Zhao, J. Zhang, J. Stuhler, G. Schuricht, F. Lison, Z. H. Lu, L. J. Wang, Sub-hertz frequency stabilization of a commercial diode laser, submitted to Opt. Comm., , , (2010)

T. Liu, Y. N. Zhao, V. Elman, A. Stejskal, L. J. Wang, Characterization of the absolute frequency stability of an individual reference cavity, Opt. Lett., 34(2), 190, (2009)

R. Sharma, J. P. Mondia, J. Schäfer, W. Smith, S.-H. Li, Y.-P. Zhao, Z. H. Lu, L. J. Wang, Measuring the optical properties of a trapped ZnO tetrapod, Microelectronics Journal, 40, 520, (2009)

Y. N. Zhao, J. Zhang, A. Stejskal, T. Liu, V. Elman, Z. H. Lu, L. J. Wang, A vibration-insensitive optical cavity and absolute determination of its ultrahigh stability, Opt. Express, 17(11), 8970-8982, (2009)

J. P. Mondia, R. Sharma, J. Schäfer, W. Smith, Y. P. Zhao, Z. H. Lu, L. J. Wang, An electrodynamically confined single ZnO tetrapod laser, Appl. Phys. Lett., 93, 121102, (2008)

T. Liu, Y. H. Wang, R. Dumke, A. Stejskal, Y. N. Zhao, J. Zhang, Z. H. Lu, L. J. Wang, T. Becker, H. Walther, Narrow linewidth light source for an ultraviolet optical frequency standard, Appl. Phys. B, 87, 227-232, (2007)

Y. H. Wang, T. Liu, R. Dumke, A. Stejskal, Y. N. Zhao, J. Zhang, Z. H. Lu, L. J. Wang, T. Becker, H. Walther, Absolute frequency measurement and high resolution spectroscopy of 115In+ 5s2 1S0-5s5p 3P0 narrowline transition, Opt. Comm., 273, 526, (2007)

Y. H. Wang, T. Liu, R. Dumke, A. Stejskal, Y. N. Zhao, J. Zhang, Z. H. Lu, L. J. Wang, T. Becker, H. Walther, Absolute frequency measurement of 115In+ 5s2 1S0-5s5p 3P0 narrowline transition - Progress toward an optical frequency standard, Laser Phys., 17, 1017, (2007)

Y. H. Wang, R. Dumke, J. Zhang, T. Liu, A. Stejskal, Y. N. Zhao, Z. H. Lu, L. J. Wang, T. Becker, H. Walther, Absolute frequency and isotope shift measurements of the cooling transition in singly ionized Indium, Eur. Phys. J. D, 44, 307-311, (2007)

J. Zhang, Z. H. Lu, Y. H. Wang, T. Liu, A. Stejskal, Y. N. Zhao, L. J. Wang, R. Dumke, Absolute frequency comb mode number determination in precision optical frequency measurements, Laser Phys., 17, 1025, (2007)