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Nanosecond Pulse Shaping

FSL 500

Fast Switched Diode Laser

  • Pulse width adjustable between 3 and 100 ns
  • Ultra short rise/fall time down to 0.3 ns / 0.8 ns
  • Repetition rate from single shot to 12 MHz
  • User-defined signal patterns via external triggering
  • Completely switched off between pulses
  • Laser heads for wavelengths from 375 to 1550 nm
  • 'On' power level adjustable between 30 % and full power

The FSL 500 laser system consists of a universal driver and different laser heads for different wavelengths. It can work in three different operation modes: internal, level and slope triggered mode, that differ in the pulse width and repetition rate achievable.

Internal trigger mode

Operation modes of the FSL 500In the internal trigger mode, the pulse width as well as the repetition rate are controlled by the internal electronics using the corresponding settings of the front panel. This trigger mode allows to vary the pulse width from 3 ns to 100 ns in approx. 1ns steps. It also features three internal user-selectable repetition rates of 3, 6 and 12 MHz.

Slope trigger mode

In the slope trigger mode, the pulse width is controlled by the internal electronics using the corresponding settings of the front panel, whereas the laser pulse is triggered by the rising edge of an external trigger input signal. This allows a variable repetition rate between 10 Hz and 12 MHz as well as adjustable pulse widths between 3 ns and 100 ns.

Level trigger mode

In the level trigger mode, the pulse width as well as the repetition rate are controlled by an external signal, which thus allows a wide variation of pulse patterns.

Optical power up to 40 mW

Pulse profile of a LDH-S-C-1060The laser heads of the LDH-S Series are available at various wavelengths between 375 nm and 1550 nm. The optical power emitted by the laser heads during the pulse duration depends on the wavelength and can reach more than 40 mW for some wavelengths. For applications requiring lower power values, it is possible to reduce the optical power of the pulse to 30 % of the maximum power using a dedicated switch on the front panel of the FSL 500. The laser heads include collimation optics and can optionally be fitted to single or multimode optical fibers.

Highest extinction ratio

A general design feature of the FSL 500 is that the driving current to the diode and hence the laser emission is completely switched off in between two pulses, even at very high repetition rates. The corresponding rise and fall times of the optical emission is in general extremely fast and can reach values of less than 0.5 ns for the rising edge and less than 1 ns for the falling edge. However, a side effect of this special design is that a short and intense optical pulse (“overshoot”) at the beginning of the pulse can be emitted. The amount and temporal relaxation of this overshoot depends on each diode and can reach up to 100% of the specified power value. However, the relaxation of the overshoot is usually very fast and can therefore hardly be seen with most detectors.


Internal Clock
Type crystal locked
Master frequency 12 MHz standard, other frequencies available upon request
External Trigger Input
Amplitude -5 to +5 V (max. limits)
Trigger level (adjustable) -1 to +1 V
Impedance 50 Ohms
Connector type BNC (female)
Synchronization Output
Amplitude < -800 mV into 50 Ohms (NIM - standard)
Pulse width 6 ns
Impedance 50 Ohms
Connector SMA socket (female)
Timing
Internally triggered
Pulse width 3 ns to 100 ns
Frequency range 3, 6, 12 MHz (user selectable)
Delay (approx.) 50 ± 10 ns (from sync output to optical output)
Jitter < 0.2 ns
External triggered, Slope mode
Pulse width 3 ns to 100 ns
Frequency range 10 Hz to 12 MHz
Delay (approx.) 50 ± 10 ns (from trigger input to optical output)
Jitter < 0.2 ns
External triggered, Level mode
Pulse width 3 ns to CW
Frequency range DC to 12 MHz
Delay (approx.) 65 ± 10 ns (from trigger input to optical output)
Jitter < 0.2 ns
Remote interlock
Voltage < 7 VDC
Loop Resistance 10 Ohms max.
Power Supply
Line Voltage 220/240 or 110/120 VAC, 50/60 Hz
Power Consumption 45 Watts max.
Physical
Dimensions 237 × 310 × 97 mm (w × d × h)

All Information given here is reliable to our best knowledge. However, no responsibility is assumed for possible inaccuracies or omissions. Specifications and external appearances are subject to change without notice.

The table lists the available laser heads of the LDH-S Series for the FSL 500. The specified power value corresponds to the "plateau" value of the rectangular laser pulse.
 

Type Wavelength
(±10) [nm]
Max. power
[mW]
Rise time
[ns]
Fall time
[ns]
LDH-S-C-375 375 12 < 0.5 < 1.0
LDH-S-C-405 405 16 < 0.5 < 1.0
LDH-S-C-470 470 10 < 0.5 < 1.5
LDH-S-C-485 485 10 < 0.5 < 1.5
LDH-S-C-635 640 12 < 0.5 < 1.0
LDH-S-C-660 660 20 < 1.0 < 1.0
LDH-S-C-780 780 20 < 0.5 < 1.0
LDH-S-C-805 805 30 < 1.0 < 1.5
LDH-S-C-840 840 20 < 1.0 < 1.5
LDH-S-C-930 930 20 < 1.8 < 1.6
LDH-S-C-980 980 40 < 0.5 < 1.5
LDH-S-C-1060 1060 35 < 0.5 < 1.5
LDH-S-C-1310 1310 8 < 0.5 < 1.5
LDH-S-C-1550 on request

Other wavelengths and optical power levels are available on demand. Please ask PicoQuant for more information.  
All measurements may be subject to a 10 % calibration error. Overshoot typically between 50 % and 100 % of the maximum power.
All laser heads include peltier cooling and collimation optics. Optionally for most wavelengths single- and multi-mode optical fibers can be fitted through appropriate fiber couplers.

Laser Class Sign

All Information given here is reliable to our best knowledge. However, no responsibility is assumed for possible inaccuracies or omissions. Specifications and external appearances are subject to change without notice.


The FSL 500 laser system can be used for various applications, where nanosecond pulses with variable pulse width are important, such as:

  • Time-Resolved Fluorescence
  • Laser Seeding
  • Time response characterization of opto-electronic devices
  • Semiconductor device testing
  • Printing industry (Computer-to-Plate technology CTP)
  • Optical data storage
  • Direct photo lithography

The following documents are available for download:



Latest 10 publications referencing FSL 500

The following list is an extract of 10 recent publications from our bibliography that either bear reference or are releated to this product in some way. Do you miss your publication? If yes, we will be happy to include it in our bibliography. Please send an e-mail to info@picoquant.com containing the appropriate citation. Thank you very much in advance for your kind co-operation.