Dissertation > Excellent graduate degree dissertation topics show

The Investigation of Two-dimensional Collimating Atomic Beam of Strontium and Detecting Fluorescence Spectrum of Intercombination Transition

Author: CongDongLiang
Tutor: ChangHong
School: Graduate School , Chinese Academy of Sciences ( National Time Service Center )
Course: Astrometry and celestial mechanics
Keywords: strontium optical clock two-dimensional collimating the Monte Carlomethod intercombination transition fluorescence detecting
CLC: TM935.115
Type: Master's thesis
Year: 2013
Downloads: 10
Quote: 0
Read: Download Dissertation

Abstract


The strontium (Sr) optical lattice clock has a better potential performance thanthe cesium fountain clock. Internationally, it is the forward-looking atomic clockwhich has most research and fastest progress. The clock is most likely for updatesand reproduction defined unit of "seconds" time as the next generation of time andfrequency primary standard clock a decade later.The cold strontium atoms’ preparation is the most important step of strontiumoptical clock. Using laser to two-dimensional (2D) collimate strontium atomic beamis an effective method to achieve a high-flux, low-divergence angle of the atomicbeam, and increase the number of trapped atoms and atom density. Strontium atomsare cooled by using of (5s2p)1S0-(5s5p)3P1intercombination transition forsecondary cooling. In order to facilitate detection, a more effective detection systemis needed. In this paper, the work has focused on the study2D collimation ofstrontium atomic beam and detection of intercombination transition fluorescencespectrum.(1)Using Monte Carlo method theoretical simulates dynamic process of2Dcollimating of strontium atomic beam. The results of the Monte Carlo method arepresented as functions of detuning and power of laser, respectively. The methodprovides some guidance for2D collimating experiments of strontium atom.(2)We experimentally study2D collimation process of strontium atomic beamand achieve the pictures of before and after the two-dimensional collimating. Theatomic fluorescence intensity as function of parameters of laser used to collimate theatomic beam is achieved. The experimental results compared with Monte Carlosimulation are in perfect agreement.(3)We develop fluorescence detection system for the intercombination transition.Based on strontium atoms (5s2)1S0-(5s5p)3P1intercombination transitioncharacteristics, choosing very low input bias current operational amplifier AD549asa preamplifier, we develop a high signal-to-noise ratio, high gain, bias adjustablefluorescent detector. The detector can satisfy the requirement of689nm laserfrequency stabilization and then be used for strontium optical clock.

Related Dissertations

  1. Study of Sub-Hertz Linewidth Laser and Theoretical Study of Atom Coherent Effect in Sr System,TN248
  2. The Investigation of Spectrum of Intercombination Transition and the Second Cooling of Sr,O562.1
  3. The Improvement of the Strontium Optical Clock’s Experimental System and Lifetime Measurement of the5s5p3P1energy State of Strontium,TM935.113
  4. Study of the Development and Pricing of China’s Weather Derivatives Based on Precipitation,P49
  5. Investigation of Luminescence Modulation by Terahertz Pulse,O482.31
  6. Investigation of the Thermal Atomic Beam Fluorescence Spectrum of （5s2）1S0-（5s5p）3P1Transition in Strontium,O562.3
  7. Fatigue and Reliability Analysis of Coke Tower under Cyclic Loading,TQ520.5
  8. Research on Optimal Sensor Placement by Sensitive Analysis on Space Frame Structures,TU317
  9. Software Measurements Models and Its Tools,TP311.52
  10. Estimating Two-factor Model of the Short Interest Rate,F820
  11. Analysis and Improvement of the Aseismic Reliability of the Reinforced Concrete Structure,TU375
  12. Fault Tree-monte Carlo Method Simulation and Analysis&Sampling Scheme Research of Reliability Test for Electric Multiple Unit (EMU),U266
  13. The Accuracy Verification and Analysis of Sourceless Efficiency Calibration Software—Gammacalib,TL817.2
  14. Study on Beam Losses and Radiation Fields in High Intensity Cyclotrons,TL542
  15. Design Methods of the Horizontal Braces Unlocated at Mid-height of Columns Based on the Monte Carlo Method,TU391
  16. The Exeperimental Study and Reliability Analysis on Two-way Slabs Reinforced with CFRP,TU375
  17. A Simulation Study of Pulsar Observing Capability of Large Radio Telescopes,P111.44
  18. Physics Calculation Model Based on Monte Carlo Method and Characteristics Analysis of Aqueous Homogeneous Reactors,TL329
  19. Global Sensitivity Analysis for High-dimensional Complex Models,O212.1
  20. Research on the Fluorescence Detecting Technology in Microfluidic Channel,O439

CLC: > Industrial Technology > Electrotechnical > Electrical measurement techniques and instruments > Frequency, waveform parameter measurement and instrumentation > Wavelength,frequency ( time) measurement and instrumentation > Frequency standards > Atomic clock
© 2012 www.DissertationTopic.Net  Mobile