KEYWORDS: Chemical species, Clocks, Laser stabilization, Ytterbium, Optical lattice clocks, Fiber lasers, Frequency combs, Signal to noise ratio, Strontium, Spectroscopy
We report the current status of our ytterbium optical lattice clock at the NMIJ, AIST. After the first measurement of the
clock transition frequency and the estimation of the uncertainty, we have been improving our clock. For an increased
signal to noise ratio of the observed spectrum, we employed an atom number normalization scheme. We stabilized the
frequency of the lattice laser using a fiber-based optical frequency comb. We also stabilized the intensity of the lattice
laser.
We have developed a one-dimensional optical lattice clock with ultracold 171Yb atoms. The absolute frequency of the
1S0(F = 1/2) - 3P0(F = 1/2) clock transition in 171Yb is determined to be 518 295 836 590 864(28) Hz with respect to the
SI second. Details of the experimental setups and atom trapping results are also described.
The present status of the development of the Yb optical lattice clock at NMIJ/AIST and future prospects are presented.
Experimental equipments such as vacuum systems and laser sources are explained in detail.
Measurement techniques for higher order aberrations of a projection optical system in photolithographic exposure tools have been established. Even-type and odd-type aberrations are independently obtained from printed grouped lines on a wafer by three-beam interference under highly coherent illumination. Even-type aberrations, i.e. spherical aberration and astigmatism, are derived from the best focus position of vertical, horizontal and orthogonal grouped lines by an optical microscope. Odd-type aberrations, i.e. coma and trefoil, are obtained by detecting relative shifts of fine grouped lines to a large pattern by an overlay inspection tool. The qualitative diagnosis for lens aberrations was demonstrated to a krypton fluoride excimer laser scanner.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.