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The PDL 828 'Sepia II' is a high-end, multichannel driver for the picosecond pulsed laser diode heads of the LDH Series and LDH-FA Series as well as for the sub-nanosecond pulsed LEDs of the PLS Series. Wavelength changes are simply performed by plugging in a different laser or LED head. The high quality and reliability of the PDL 828 is expressed by a unique 5-year limited warranty.

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Ultra flexible driver solution

The PDL 828 “Sepia II” provides maximum flexibility for multiple wavelengths applications. It drives any combination of up to eight laser or LED heads in parallel or in a user defined sequence. The whole system has no manual controls – instead it is easily configured and controlled through a dedicated Windows control software via a USB connection. Last settings are saved inside the PDL 828 to allow stand-alone operation, making it a powerful device for measurement automation. A computer library to access the functions of the PDL 828 for custom development is also provided with the device.

Individual modular assembly

The PDL 828 is available in different sizes to control any number of laser / LED heads between 2 and 8 at the same time. Each PDL 828 is assembled individually from a mainframe with power supply and computer interface and two modules: an oscillator and burst generator module and up to eight laser driver modules. The communication between the modules is achieved via external cabling – delays can thus be easily inserted by using different cable lengths. The PDL 828 allows to produce a wide range of user-definable pulse patters such as sequences or bursts. All connected laser/LED heads can also be fired at the same time.

Powerful oscillator module

Two models of oscillator and burst generator modules are available, each with eight individually addressable trigger outputs (output channels). Both modules feature a rotary sequencer with programmable channels where one channel must be completed before the next one activates.
The SOM 828 module allows grouping of adjacent output channels so that they can be activated at the same time. The 8 channels of the SOM 828-D module can be freely combined with each other to yield complex pulse patterns where one channel will activate simultaneously with its combination partners. Alternatively, instead of combining channels, an individual, software controlled delay can be introduced for any non-combined channel.
Both modules offer burst operation, where multiple pulses can be output from either single, grouped, or combined channels before the next channel becomes active. Both oscillator modules have their own (variable) synchronization output, external trigger input as well as auxiliary input and output connectors.

Flexible laser driver module

A laser driver module is necessary for each laser/LED head that needs to be connected and controlled at the same time by the PDL 828. The timing of the emitted pulses can be controlled by an external trigger signal, which is typically provided by the oscillator module or any other source providing a NIM compatible signal. As a special feature, each Laser Driver Module can also operate independently from the other modules driven by its internal low-jitter oscillator at six fixed, user-selectable frequencies (80, 40, 20, 10, 5 or 2.5 MHz). All emitted laser pulses are accompanied by a synchronization output at the front panel of the laser driver module. This signal is always synchronised to the trigger source, independent from the selection of triggering mode (i.e., external or internal triggering).

Complete control of laser power and CW operation

The intensity of the laser emission is controlled via an internal voltage in steps of 0.1% of its full scale value. However, due to the non-linear behaviour of laser diodes, the voltage setting does not linearly correspond to the output power, i.e., a voltage of 50% does not correspond to 50% of the maximum output power. A special feature of the PDL 828 is to switch between CW and pulsed mode with the LDH-D Series of laser heads.

Gating options

For special applications using, e.g., scanning devices, the PDL 828 provides two special gating options that allow to suppress the laser emission by an external signal: A slow gate, that reduces setting times of the laser heads to a minimum at slow on / off periods (seconds) and a fast gate, that can perform transitions within nanoseconds, i.e., in between two pulses. The fast gate also provides high pulse stability when the on/off signal is periodic and fast (milliseconds).

For applications that require only a single wavelength, the alternative single channel driver PDL 800-D can be provided.

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There are many thousands of different types of diode, bipolar transistor and FET. These semiconductor devices have different characteristics according to the way they are designed and made.

As a result it is essential that the different semiconductor devices are given different part numbers to distinguish them from each other.

Initially manufacturers had to give their own numbers to devices, but soon standard part numbering schemes were used for semiconductor devices including diodes, bipolar transistors and FETs - both JFETs and MOSFETs.

Having industry standard numbering schemes for semiconductor devices has many advantages, not only for large scale manufacturers of electronic equipment right down to the hobbyist and student.

Semiconductor device numbering / coding schemes

There are many different ways of organising a numbering scheme. In the early days of thermionic valve (vacuum tube) manufacture, each manufacturer gave a number to the types they manufactured. In this way there were vast numbers of different numbers for devices many of which were virtually identical. It soon became obvious that a more structured approach was required, so that the same device could be bought regardless of the manufacturer.

The same is true for semiconductor devices, and manufacturer independent numbering schemes are used for diodes, bipolar transistors and FETs. In fact there a few semiconductor numbering schemes in use:

Pro-electron numbering scheme This diode, bipolar transistor and FET numbering scheme was originated in Europe and is widely used for transistors developed and manufactured here.
JEDEC numbering scheme This diode and transistor numbering scheme was originated in the USA and it is widely used for diodes and transistors that originate from North America.
JIS numbering scheme This semiconductor device numbering system was developed in Japan and can be seen on diodes, transistors and FETs that are made in Japan.
Manufacturers own schemes: There are some devices, particularly specialised bipolar transistors and some FETs for which individual manufacturers may wish to retain all the manufacturing rights. They may not want to open up the specifications and manufacturing methods to others is they are using a technique they have developed. In these and similar instances, manufacturers will use their own part numbering schemes that do not conform to the industry standard schemes

The aim of the the industry standard numbering schemes is to allow for the identification and description of electronic components and in this case semiconductor devices including diodes, bipolar transistors and field effect transistors, to have common electronic components and component numbering across several manufacturers. To achieve this, manufacturers register a definition for new electronic components with the relevant agency and then receive a new part number.

This approach enables electronic equipment manufacturing companies to have second sources for their components and in this way assure the supply for large scale manufacturing and also to reduce the effects of obsolescence.

To varying degrees these numbering schemes allow for a broad description of the function of the diode, transistor or FET. The Pro-Electron scheme providing far more information than the others.

Pro-Electron or EECA Numbering Coding System

The Pro-Electron numbering scheme to provide a standardised scheme

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