FESCA-200 Femtosecond streak camera C6138 series The FESCA-200 is an ultra fast streak camera with a temporal resolution of 200 femtoseconds (typ.). It is designed for use with single-shot or slow-repetitive phenomena. It can analyze the process of energy relaxation and the dynamics of chemical reaction in the femtosecond region in combination with femtosecond pulse laser. ¡Single-shot 200 fs (typ.) temporal resolution ¡Simultaneous measurement of light intensity on both the temporal and spatial axis ¡Dedicated readout system t t Streak image and intensity profile of light pulses from Ti:Sapphire laser measured with the FESCA-200 Features This streak image, taken with the FESCA-200, was used to measure Cherenkov radiation. LINAC was used to generate an electronic pulse, which, in contact with the air, produced the Cherenkov radiation. Photo courtesy of Dr. Mitsuru Uesaka, Associate Professor, Nuclear Engineering Research Laboratory, Faculty of Engineering, University of Tokyo. Applications Research of the process of energy relaxation of quantum well semiconductors Research of the dynamics of chemical reactions in the femtosecond region Research of the dynamics of ultra fast laser diodes, ultra fast optical logic devices, etc. Diagnosis of femtosecond lasers System configuration 1 FESCA-200 Femtosecond streak camera C6138 main unit 2 Data analyzer C6760-36 3 ORCA-R2 Digital CCD camera C10600-10B Data analysis module M5755-36 Optical Beam IEEE1394b board POWER SUPPLY C6138 Optical trigger FESCA-200 Femtosecond streak camera C6138 power supply unit 4 Input optics Pin diode head C1083-01 Delay unit C1097-05 Streak image analysis software USB Trigger signal Standard Optional Operating principle The light pulse to be measured is projected onto the slit and is focused by the lens into an optical image on the photocathode of the streak tube. Changing the temporal and spatial offset slightly each time, four light pulses, each with a different light intensity, are introduced through the slit and conducted to the photocathode. Here, the photons are converted into a number of electrons proportional to the intensity of the incident light. The four light pulses are converted sequentially to electrons which are then accelerated and conducted towards the photocathode. As the group of electrons created from the four light pulses passes between a pair of sweep electrodes, a high-voltage is applied (see above), resulting in a high-speed sweep (the electrons are swept in the direction from top to bottom). The electrons are deflected at different times, and at slightly different angles in the perpendicular direction, and are then conducted to the MCP (micro-channel plate). As the electrons pass the MCP, they are multiplied several thousands of times and are then bombarded against the phosphor screen, where they are converted back into light. The fluorescence image corresponding to the first incident light pulse is positioned at the top of the phosphor screen, followed by the others, with images proceeding in descending order; in other words, the axis in the perpendicular direction on the phosphor screen serves as the temporal axis. The brightness of the various fluorescence images are proportional to the intensities of the corresponding incident light pulses. The positions in the horizontal direction on the phosphor screen correspond to the positions of the incident light in the horizontal direction. Sweep circuit Trigger signal Light intensity Time Sweep electrode Streak Image on phosphor screen Lens Time Space Slit Space Photocathode Accelerating mesh MCP Operating Principle of the Streak Tube Phosphor screen Specifications 1 FESCA-200 Femtosecond streak camera C6138-11, -12 • Main unit Temporal resolution Time axis Spatial axis Sweep time/full screen (10 mm) Trigger jitter Trigger delay Maximum sweep repetition frequency Maximum input voltage Trigger input Maximum input repetition frequency Trigger level Power supply Operating temperature Operating humidity Effective phosphor screen size 200 fs (better than 300 fs) typ. (at the fastest sweep range) Approx. 10 mm Approx. 9 mm 20 ps, 50 ps, 100 ps, 200 ps, 500 ps, 1 ns Less than ±20 ps Approx. 30 ns (at the fastest sweep range) 100 Hz ±5 V / 50 Ω 150 MHz -4 V to +4 V AC 100 V to AC 240 V, 50 Hz/60 Hz 0 °C to +40 °C Less than 70 % (with no condensation) • Streak tube • Image intensifier Photocathode/Material of Windows Effective photocathode size C6138-11 Spectral response C6138-12 Phosphor screen size Phosphor screen Image magnification Multi-alkali / Kovar glass Max. 3 mm (H) 280 nm to 850 nm 300 nm to 1050 nm φ 18 mm P-43 1:3 Effective photocathode size Photocathode Light gain Phosphor screen Effective phosphor screen size φ 18 mm GaAsP More than 2500 P-43 φ 18 mm 2 Data analyzer C6760-36 • Data analysis module M5755-36 Image Input board I/F Data acquisition External device control Profile analysis Calibration File format (image) File format (profile) Data processing IEEE1394b PCI Monitoring, Analog integration, Photon counting Streak camera, Spectrometer etc. Realtime monitoring, FWHM, Peak count etc. Dark current, Shading, Time axis, Wavelength axis, Jitter Binary (16 bit), TIFF, ASCII TEXT Windows PC R 3 ORCA-R2 Digital CCD camera C10600-10B Effective number of pixels Cell size Frame rate Normal scan Fast scan Readout noise (rms) typ. Dynamic range typ. Cooling method / temperature Normal scan Fast scan Forced-air cooled Water cooled Dark current Dual A/D converter Exposure time 1344(H) × 1024(V) 6.45 μm (H) ✕ 6.45 μm (V) 8.5 Hz (binning : 1 ✕ 1) 15.6 Hz (binning : 2 ✕ 2) 16.2 Hz (binning : 1 ✕ 1) 28.4 Hz (binning : 2 ✕ 2) 6 electrons 10 electrons 3000 : 1 (Normal scan / binning : 1✕1) - 35 ˚C - 40 ˚C (Water temperature : +20 ˚C) 0.0005 electrons/pixel/s (- 40 ˚C) 12 bit or 16 bit 10 μs to 4200 s 4 Input optics Type number Spectral transmittance Image magnification Effective F number < Others > Input optics A1976-01 200 nm to 1600 nm 1:1 5.0 Mirror optics A6856 200 nm to 1600 nm 1:1 4.0 • Pin diode head C1083-01 • Delay unit C1097-05 Dimensional outlines (Unit: mm) ¡C6138 main unit (Approx. 26 kg) A1979-1 40±1 ¡C6138 power supply unit (Approx. 2.6 kg) 305±2 A5309(3:2) ORCA-R2 350±2 98.5±2 POWER SUPPLY C6138 160±1 140±2 202±2 107±1 225±2 283±3 456±3 523.5±3 275±2 • The temporal resolution of FESCA-200 The temporal resolution of FESCA-200 can be limited depending on wavelength or input light intensity. (See Figure 1, 2) The photoelectron from photocathode spread spatially along as the wavelength become shorter. Therefore, the temporal resolution is limited by wavelength. The photoelectron can be spread spatially, each photoelectron bound back while traveling inside streak tube if a number of photoelectron is increased. Thus, the temporal resolution can be limited. WAVELENGTH 400 nm 2000 1800 1800 1600 1600 Time resolution (fs) Time resolution (fs) WAVELENGTH 800 nm 2000 1400 1200 1000 800 600 1400 1200 1000 800 600 400 400 200 200 100 1000 10000 100000 1000000 100 1000 10000 Intensity (photons) Intensity (photons) Figure 1 Figure 2 100000 ★ ORCA is registered a trademark of Hamamatsu Photonics K.K. ★ Product and software package names noted in this documentation are trademarks or registered trademarks of their respective manufacturers. ● ● Subject to local technical requirements and regulations, availability of products included in this promotional material may vary. Please consult your local sales representative. Information furnished by HAMAMATSU is believed to be reliable. However, no responsibility is assumed for possible inaccuracies or omissions. Specifications and external appearance are subject to change without notice. © 2015 Hamamatsu Photonics K.K. 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No. SHSS0003E04 AUG/2015 HPK Created in Japan