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Generating the Synchronisation Signal

TCSPC needs a timing reference signal from the light source. This is no problem for picosecond diode lasers, which deliver a trigger output pulse from the laser diode driver. For free-running solid-state lasers or jet-stream dye lasers, a suitable synchronisation signal can be generated by a photodiode. A simple solution is to use a fast PIN photodiode in one of the circuits shown in Fig. 7.42. [Pg.304]

The resistor, R, protects the diode against overload and accidental reversal of the supply voltage. The capacitor, C, provides a low-impedance RF-retum path to ground. The capacitor must be a low-impedance surface-mount type. The resistor is not critical. The connection length in the path GND-C-Photodiode-Connector must be kept to a minimum, or a 50 Ohm strip line on a printed circuit board must be used. Please note that the circuit gives a fast response only if the output is terminated with 50 Ohm. [Pg.304]

The requirements for the diode depend on the amplitude fluctuations and the intensity drift of the laser. Good TiiSapphire lasers have negligible amplitude flue- [Pg.304]

The pulse current, obtained for a given average power, and vice versa, can be estimated by [Pg.305]

Si photodiodes have a poor sensitivity in the UV range. UV-enhanced Si PIN photodiodes are available, but usually do not perform well at short pulses. In fre- [Pg.305]


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