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Product Studies

This page lists product studies or prototypes designed by our R&D department. Please note that items presented on this page are not necessarily readily available products. Feel free to contact us, if you are interested or want to contribute to any product study shown here.


PPL 512

Programmable Pulsed Diode Laser

  • Programmable pulse shape
  • 200 ps bin width
  • 512 time bins
  • 8 bit resolution

Description

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The PPL 512 is a programmable diode laser that can generate arbitrary pulse shapes with a timing resolution of 200 ps. An amplitude level with 8 bit resolution can be assigned to each time bin having a width of 200 ps. A laser signal with the defined pulse shape is the output to a single mode fiber.

By programming fast current slopes, gain switched operation can be achieved, which results in picosecond optical output pulses. Also, undesired ringing effects at fast switch-on transients can be reduced by defining specific current ramps. Moreover, saturation effects of optical amplifiers can be pre-compensated, which makes the device an ideal seeding source for fiber or solid-state amplifiers.

The PPL 512 can be configured to provide pulses at wavelengths such as 1030 or 1064 nm, 1.5 or 2 µm, as well as many wavelengths in the visible range.

Pulse examples

The plots presented here show pulse shapes generated by the PPL 512 connected to a laser diode. The optical output of the diode was measured using a combination of photodiode and digital sampling oscilloscope.

The pulse shape on the left has a temporal width of ca. 45 ns and features two pairs (high, low) of sharp intensity peaks in the pattern high, low, low, high. The pulse shown in the middle plot features a house-like shape with a rising slope followed by a declining one. This pulse has a temporal width of ca. 30 ns. The rightmost plot contains a periodic sawtooth shape, where each "tooth" has a temporla width of ca. 100 ns.

The repetition rate at which all of these pulse shapes were generated was ca. 9.8 MHz, corresponding to 512 time bins, each having a bin width of 200 ps.

Series of pulse shapes that were generated by the PPL 512

The PPL 512 can also generate bursts patterns as shown in the plots below. Here a pattern of a repeating pattern of 4 bursts consisting of 2 packets of 5 narrow pulses each was generated. Each individual pulse has a temporal width of ca. 90 ps and the shortest spacing between two packets of 5 pulses was 23 ns. Between each couple of pulse packets, a temporal spacing of 66 ns was introduced. As for the pulse shapes shown above, the burst pattern can be generated at a rate of about 9.8 MHz.

Burst pattern generated with the PPL 512