R12290U_15 Datasheet, PDF (3/4 Pages) Hamamatsu Corporation – ULTRA-FAST PHOTODETECTOR BIPLANAR PHOTOTUBES

MAXIMUM EXCIMER LASER MEASUREMENT RANGE OF R12290U-55
The R12290U-55 is designed for use in the measurement of excimer
lasers that have high-power light pulses. Combined with an attenua-
tion filter (E3331: sold separately) it is particularly suited for measure-
ments of excimer lasers being directly illuminated onto the photoca-
thode at very high power levels. (See figure 4.)
Maximum Excimer Laser Measurement Range
Items
No attenuation filter Attenuation filter (sold separately)
Excimer Laser (nm) ArF (193 nm) KrF (248 nm) XeCl (308 nm) ArF (193 nm) KrF (248 nm) XeCl (308 nm)
Input Light Energy Density (W/mm²) 1 × 10² 1 × 10² 4 × 10⁵ 5 × 10⁴ 5 × 10⁴ —
Peak power* (W) 7 × 10⁴ 7 × 10⁴ 1 × 10⁸ 2.5 × 10⁷ 2.5 × 10⁷ —
* Peak power (W)= ^{Excimer laser pulse energy (J)}
FWHM of excimer laser pulse (s)
Figure 4: Light Saturation (Linearity) Characteristics
10
RINGING
The distortion of a high-speed pulse signal is greatly effected by the
measurement system used to measure this signal. For instance, when
impedance matching is taking place between the phototube and the
measurement system, a portion of the signal may happen to become a
reflection signal and return back to the phototube. A portion of this re-
flection signal is then once again propagated through the phototube to
the oscilloscope. As a result a periodically diminishing signal or damp-
ing oscillation is observed on the oscilloscope. This phenomenon is
known as ringing. (See Figure 5.)
Figure 5: Typical Pulse Distortion by Ringing
KrF (248 nm)
1
ArF (193 nm)
XeCl (308 nm)
0.1
0.01
10⁵
10⁶
10⁷
10⁸
10⁹
PEAK POWER (W)
* The data of ArF and KrF excimer lasers are those obtained when an attenuation
filter E3331 (sold separately) was used.
The R12290U and R1328U are built in a special metal housing de-
signed with well considerations of electrode shape, housing shape, the
widening of bandwidth and the impedance matching of a load resist-
ance output connector. Their laser pulses are thus output through the
N-R connector of an excellent frequency characteristic. For this rea-
son, you must use their output cable, connector and characteristic im-
pedance of the measuring system at 50 Ω.
IDIMENSIONAL OUTLINE (Unit: mm)
GR12290U
FILTER DIAMETER
CATHODE
87.5
69.5
TRIPOD THREAD
W1/4 × P1.27 DEPTH 7.5
GR1328U
FILTER
DIAMETER
30 ± 1
28
+HV INPUT CONNECTOR
(SHV-R)
TRIPOD THREAD
W1/4 × 1.27 DEPTH 4
SIGNAL OUTPUT
CONNECTOR
(N-R)
CATHODE
24 ± 2
+HV INPUT (SHV-R)
SIGNAL OUTPUT CONNECTOR (N-R)
GDiameter and Area of Photocathode
Type No.
Diameter (mm) Area (mm²)
R12290U-51 to -54
20
314
R12290U-55
29
660
R1328U Series
10
78
TRIPOD THREAD
M6 P1.0 DEPTH 7.5
TPT A0050EA
ANODE MESH
140 MAX.
PHOTOCATHODE 10
TPT A0018EB
1. Since these devices use a high voltage from 2000 V to 2500 V, extreme care should be taken to ensure the safe-
ty of personnel handling and using these devices, especially with respect to insulation and shock prevention.
2. When preparing for measurement, be sure to short the signal output connector before connecting the signal cable
with it in order to allow electric charge stored in the device to be discharged.
3. As an added measure for accident prevention, when a high voltage power supply with a low impedance output is
used, a protective CR network can be placed between the power supply and the phototube as shown in figure 12.
It is recommended that, if actually used, an CR network with the values or similar values shown in the figure be
selected and placed as close to the phototube as possible.
4. If the phototube envelope is broken and air is allowed to enter the tube, the tube will become unusable. There-
fore, care should be taken not to subject the tube to shock.
5. Use with high currents will tend to cause the phototube to fatigue, causing a deterioration of its characteristics.
Therefore, unnecessarily high currents should not be used and care should be taken so that strong intensity
beams are not shone on one portion of the photocathode. In particular, if such a condition exists, it is recommend-
ed that a diffuser plate be used.
6. Care should be taken to avoid high humidity. When storing the devices they should be packed together with a
desiccant or contained in a desiccator.
DANGER ... Do NOT apply a high voltage unless insulation is sufficiently provided.
CR Network
+HV POWER
SUPPLY
R1
R1=R2=^..100 kΩ
C1=0.2 µF
(4 kV or more)
R2
C1
(use this valve or
similar value to this.)
A CR network is placed
as close to the phototube
as possible.