introduction of sato lab. in niigata university takashi sato (prof.), masashi ohkawa (prof.), kohei...
TRANSCRIPT
Introduction of Sato lab. in Niigata University
Takashi Sato (Prof.), Masashi Ohkawa (Prof.),
Kohei Doi (Assistant Professor, Dr.),
Shinya Maehara (Research Assistant)
Kohei Kawakami (M2), Naoya Shimizu (M1), Yu Ohtomo (B4)Faculty of Engineering Niigata University
Outline
1. Introduction
2. Sato lab. in Niigata University
3. Research project in Sato lab.
4. A Satellite-to-Satellite Interferometry for
the Earth’s Gravity Field Determination
5. Our project
Japan
Tokyo
Niigata City
NiigataPrefecture
1. Introduction
Niigata University locates at the west side of Niigata City area.
1. Introduction
Niigata University locates at the west side of Niigata City area.
Niigata City
Niigata University (13,000 students)
Niigata University has 10 Faculties
Faculty of Humanities Faculty of LawFaculty of Economics Faculty of Education and Human SciencesFaculty of Engineering Faculty of ScienceFaculty of Agriculture Faculty of DentistryFaculty of Medicine School of MedicineFaculty of Medicine School of Health Science
7 Graduate Schools
Graduate School of Education Graduate School of Health Science Graduate School of Modern Society and Culture Graduate School of Science and Technology Graduate School of Medical and Dental Sciences Graduate School of Technology Management Law School
Faculty of Engineering (2,200 students) 7 Departments
Mechanical and Production EngineeringElectrical and Electronic Engineering
Information EngineeringBio-cybernetics
Chemistry and Chemical EngineeringCivil Engineering and Architecture
Material Science and Technology
2. Sato lab. in Niigata University
I have one Assistant Professor, one Research Assistant, three Dr. course students, four M2 students, five M1 students, and five undergraduate students in my laboratory.
Prof. Ohkawa belongs in Department of Bio-cybernetics. At first, we will make the new team and work on KAGRA
project. The member of this team will be:Takashi Sato (Prof.), Masashi Ohkawa (Prof.),Kohei Doi (Assistant Professor, Dr.),Shinya Maehara (Research Assistant)Kohei Kawakami (M2), Naoya Shimizu (M1), Yu Ohtomo (B4)
A Diode Laser Compactness, Maintenance free,
Good energy efficiency, durability
The oscillation frequency is changeable by the temperature or injection current.
The oscillation frequency stabilization
Expansion of the application field
A Diode Laser The oscillation frequency is also
changeable by a magnetic field.
The oscillation frequency control
Expansion of the application field
A Diode Laser Its oscillation frequency width
is wide compared with other
types of lasers.
The oscillation frequency narrowing
Expansion of the application field
A Diode Laser Its frequency noise is large and
wide compared with other
types of lasers.
Can we use this frequency noise characteristics?
Expansion of the application field
3. Research project in Sato lab.
Applications using the Beat signal
When two lasers which have different frequencies (f1,f2) are superimposed, we can observe the beat signal, i.e., the frequency difference (f=f1-f2), between two lasers.
Generation of THz radiations
Select ability of radiation frequencyLow costCompactness
Photonic generator of THz waveUsing beat signal
FOR•Wire-less broad-band communication
•THz imaging+The Oscillation frequency stabilization
Frequency shift observed using in a magnetic field
The frequency of the sample VCSEL was set at the shorter wavelength side from that of the reference F.P. type laser, after which we applied the magnetic field, so Fig. 7 shows that the oscillation frequency of our sample VCSEL shifts to the higher frequency side.
Physical random number generationPhysical random number generation
For the past few years, diode laser’s output intensity noises have been used as the seed for rapid physical random number generation, reaching the Gbit/s range.
We, however, generated the physical random numbers from a diode laser’s frequency noise. That is to say, that we converted laser frequency fluctuations directly to fluctuations in the intensity of the light transmitted through the optical frequency discriminator, and then to 8-digit binary numbers, by means of an analog-to-digital converter (ADC).