ETL NEWS 1999.9
ETL NEWS 1999.11 Establishment of an Evaluation Technique for Laser Pulse Timing Fluctuations Optoelectronics Division Hidemi Tsuchida e-mail:tsuchida@etl.go.jp A new technique has been proposed and demonstrated for measuring the pulse timing fluctuations of mode-locked lasers at low Fourier frequencies. The time interval between the laser pulses is precisely measured by using zero-deadtime counters on referencing to a stable atomic oscillator. By combining this method with the time-domain demodulation technique, the phase noise power spectral density of a mode-locked Cr:LiSAF laser has been estimated for 1 mhz 1 MHz Fourier frequency with 240 db dynamic range. 100.00 MHz 6.485 MHz 10.00 MHz
ETL NEWS 1999.9 von der LindeSSB ~ ~ V(t)=V 0 [1+ ε(t)]sin[2 πf r t+ φ (t)], V f r ε(t)φ (t) φ (t) S φ ( f ) V(t) S φ ( f ) ε(t) φ (t) S φ ( f ) d t T = 1 φ() 2π dt 1 S φ ( f )
ETL NEWS 1999.11 (a) (b) N P N PN P N P N P ~
ETL NEWS 1999.9 6 4 (a) 6 4 2 2 0 0-2 -4 f 0 = 100 MHz f IF = 6.485 MHz N P = 64853 N T = 4096-2 -4-6 -6 0 10 20 30 40 300 250 (b) 200 150 100 50 0-6 -4-2 0 2 4 6 (a)n P (b) S φ ( f ) ~ A ~ S φ ( f ) f f B 50mHz~1MHz ~ B
ETL NEWS 1999.11 10 10 S f (f) [rad 2 /Hz] 10 5 10 0 f 0 = 6.485 MHz f s = 15.00 Hz N T = 8192 10-5 10-10 10-15 10-3 10 0 10 3 10 6 f [Hz] C B ABC ~ D σ y (τ) y = 1 2πf r dφ( t) dt σ y (τ) σ y (τ) ~ ~ σ y (τ) σ y (τ)
ETL NEWS 1999.9 σ 10-6 10-7 10-8 10-9 10-10 N av = 4 N av = 10 10-3 10-2 10-1 10 0 10 1 10 2 10 3 τ [s] ~ ~
ETL NEWS 1999.11 Low Temperature Scanning Synchrotron Microscope Synchrotron radiation for superconducting photon detection technology http://www.etl.go.jp/etl/divisions/~5636/crel/crelhome.html Quantum Radiation Division, Cryogenic Radioelectronics Lab. H. Pressler, M. Koike, T. Zama, M. Ukibe, N. Kobayashi, and M. Ohkubo *e-mail: ohkubo@etl.go.jp The ETL synchrotron radiation facility TERAS has been employed for superconducting photon detection technology. The new equipment called Low Temperature Scanning Synchrotron Microscope (LTSSM) is installed for characterizing superconducting X-ray photon detectors, which are kept at 0.4K. The LTSSM is beginning to provide important information for improving the performance of the superconducting detectors. C X X γ E λ che=hc/λ X γ γ µgµm µev X λ/ λ(= E/E)=10-3 -10-6 ~ /s 0.7eV(λ=1.7µm)
ETL NEWS 1999.9 X 140eV@6keV( E/E=0.02) γ X E/E 10-3 ev@6kev X γ (LTSSM) µm µm ADC Shaping amp. Position controller Preamp. Position controller SR 0.4K
ETL NEWS 1999.11 µm 2-6keV X X X µm X X Fe X FeX X XX X X X (2 =3.1meV) 2 EE/ 140eV@6keV X
ETL NEWS 1999.9 µ ~ ms ns µs (http:// www.etl.go.jp/etl/divisions/~5636/crel/publications/ fluxoid.pdf) 200 200µm 2 µmx x=y=17 X
ETL NEWS 1999.11 x=21 y 34 Charge output [a.u.] 18 y pixel number 200x200µm 2 0 21 34 x Charge output [a.u.] y=18 Yield x=y=17 x pixel number Charge output [a.u.] µm 34 34 55 Fe x=21 y y=18 x= X µ
ETL NEWS 1999.9 E/E=10-3 X X (http://www.astro.isas.ac.jp/xray/mission/astroe/astroe.html) C Kα β XX X X X
ETL NEWS 1999.11 BERTHOUZE, Luc Felix Rene