OG-B/F. Pulse Pickers with Fixed Gate Open Time

Electrooptic pulse picker systems with fixed gate open time are used to select single pulses from a train of femtosecond pulses for numerous applications. The systems are also used for injection/ejection purposes in an ultrafast laser amplifier system, as well as for amplifier contrast improvement.
OG-F-D-... OG-B-D-... OG-B-B-... OG-B-R/K-...
Electrooptic crystal DKDP BBO RTP or KTP
Operational wavelength range (standard models) 510-540 nm / 700-1000 nm / 1000-1100 nm / 1250 nm 510-540 nm / 700-1000 nm / 1000-1100 nm / 1250 nm 1000-1100 nm / 1500-1600 nm / 1550+780 nm
Possible custom wavelengths from 340 to 1280 nm from 200 to 2200 nm from 1000 to 2700 nm 
Minimum repetition rate of picked pulses single-shot
Maximum repetition rate of picked pulses (standard models) 1 kHz 3 kHz / 10 kHz / 50 kHz / 100 kHz 3 kHz / 10 kHz / 50 kHz / 100 kHz / 200 kHz / 1 MHz
Clear aperture 6 mm 6 mm (up to 20 mm upon request) 2.5 mm (up to 5 mm upon request) 3.5 mm (up to 10 mm upon request)
HV pulse (gate) shape bell-shaped
HV pulse (gate) length
(at level 10%)
3 ns 8 ns
Rise time
(at level 10-90%)
700 ps 3.5 ns
Fall time
(at level 90-10%)
2 ns 3.5 ns
Contrast(1) >1500:1 >700:1 >800:1
Pockels cell voltage up to 10 kV up to 4 kV up to 3 kV
Optical scheme half-wave
(quarter-wave upon request)
half-wave/quarter-wave at λ<600 nm; at λ>600 nm - quarter-wave or half-wave with double crystal cell half-wave
(quarter-wave upon request)
Trigger internal/external
Complete system transmission at central wavelength >85% (two Glan-Taylor prisms, standard package)
>90% (a Glan-Taylor and a Rochon prism, upon request)
>98% (Pockels cell w/out polarizers) 
Input optical train repetition rate 2 MHz …150 MHz with internal or external trigger with optical or electric sync to input train; 1 Hz…2 MHz only with external trigger signal(2)
Sync source for internal trigger mode optical/electric
Additional control modes by edge / by level / built-in burst generator with internal or external trigger
Channel delay time 0...10 us (up to 1 ms upon request)(3) 0...1 us (up to 5 us upon request)(3)
Cooling passive at up to 3 kHz output rate, water-cooled(4) at 10 kHz and higher
(1) - energy ratio of a picked and any non-picked pulse. The given contrast values are valid for adjacent pulses;
(2) - when operating with 1 Hz…2 MHz input pulse train, an external trigger signal must be used. Such a signal must lead the optical pulse by 0.25-3 us, must be rigidly in sync with the pulse to be picked and must have jitter of less than 200 ps;

(3) - maximum channel delay time is defined by maximum repetition rate of picked pulses and cannot exceed the temporal distance between adjacent pulses at this frequency;
(4) - the HV generator unit requires cooling to support operating temperature below 35°C. Water cooling is required when operating at output frequency of 10 kHz and more (water flow 1 L/min, water temp. 20-22°C, tap or building-scale supply may be also be used if permitted). Heating power to be dissipated does not exceed 80 W even at the highest frequencies (a water chiller is not included and may be supplied separately);

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