Introduction of Researches

Present Major Research Themes and Standards Dissemination

Research on accurate measurement of absolute frequency of light and microwave (Special Research: '97-'00)

Development of an ultimate accuracy frequency standard based on atomic fountain of laser cooled and trapped Cs atoms

Research on the realization of accurate Cs primary frequncy standard (Ordinary Research: '94-'97)

Development of an accurate Cs frequency standard based on optical pumping method for the operational primary standard

Research on the wide band frequency chain technology (STA Coordinated Joint Research: '93-'97)

Development of optical parametric oscillators and optical frequency comb generators for wide band frequency chain

Maintenance and dissemination of the laser wavelength standard

Maintenance and dissemination of time & frequency standard

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List of Laboratory's Major Output

1. Development of optically pumped Cs beam frequency standard

2. Development of atomic fountain Cs frequency standard

3. Development of a transportable iodine stabilized laser for wavelength standard

4. Development of a line width narrowed visible diode laser spectrometer and application to high resolution spectroscopy of Ca and I₂

5. Development of stable CW optical parametric oscillator and optical frequency comb generator

6. High precision time comparison using Global Positioning System

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List of Future Possible Research Themes

1. Establishing of further accurate frequency standards (atomic fountain and optically pumped) and their practicallization

2. Establishing of accurate and compact laser wavelength standards

3. Development of high resolution solid state laser spectrometers and application to the precision spectroscopy

4. Establishing the technology for the optical frequency measurement based on frequency division method (wide band frequency chain)

5. Study on the kinematics of laser cooled atoms

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Major Publications

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Please send your comments and contributes to

ohshima@nrlm.go.jp