Laser Diode Characterization System LIV120

General Operation

What does LIV stand for?

LIV stands for Light-Current-Voltage, referring to the three parameters measured during laser diode characterization.

What measurements can the LIV100/LIV120 perform?

Typical measurements include:

• L-I curves (optical power vs current)
• V-I curves (forward voltage vs current)
• Threshold current
• Slope efficiency

What types of devices can be tested?

• Laser diodes
• LEDs
• VCSELs
• Photonic components requiring current and optical characterization

What is the difference between LIV100 and LIV120?

The LIV100 is a short pulse device used for unpackaged devices such as chips or bars. The LIV120 is a QCW/CW device generally used for mounted or packaged devices such as TO and CS mounts.

I require a specific current range that I do not see on your website or brochure, is it possible to request custom current or voltage ranges?

It is typically straightforward to adjust these ranges, simply inquire with your requirements and a device will be matched to your project.

Measurement Questions

How is optical power measured during LIV testing?

Using an integrated detector such as a photodiode or integrating sphere connected to the system.

What is threshold current?

The threshold current is the current level at which the laser diode begins to emit coherent laser light.

What is slope efficiency?

Slope efficiency describes how efficiently current is converted into optical power above the threshold.

Can pulsed measurements be performed?

Yes. Pulsed operation reduces heating effects during measurement.

How do I connect a laser diode to the LIV100?

The LIV100 uses strip line technology to minimize inductance. The laser diode is connected via the output terminals with proper polarity. Contact cards are available upon request for custom connection configurations.

How do I connect a laser diode to the LIV120?

The laser diode is connected via the output terminals with proper polarity. If this is a low current device there will be a DB9 output.

What maintenance is required?

Typical maintenance includes:

• periodic calibration
• connector inspection
• optical surface cleaning (dusting with clean, dry air only)

Integration

Can the LIV system be automated?

The system supports automated measurements via software control.

Can temperature control be integrated?

Thermoelectric controllers and temperature-controlled stages can be added.

Is it suitable for production testing?

Yes, especially for automated LIV sweeps. The system can perform complete laser characterization measurements in extremely short time for high throughput.