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Laser Diode Driver Module; Current Range 1,500 mA, USB / RS232 / Analog Controls

  • LDI-186 Laser Diode Driver from Ostech
  • Laser Diode Driver Software
  • laser diode driver made in Germany
  • Laser Diode Driver Connectors
  • Laser Diode Driver Pinout

$1095.00  
sku / item#: LDI-186
ships: In-Stock (USA)

Key Features
  • Multiple protection circuits safeguard your laser diode
  • Rear panel connector for feedback from external temperature sensor (ie 10K thermistor) with shut-down if laser over-temperature condition is detected
  • USB and RS232 interfaces, LabVIEW drivers
  • GUI software; Python libraries and terminal control software included
  • CW and Quasi-CW (QCW) modes
Product Warranty
All products purchased from Laser Lab Source
are sold with a full one-year warranty.
See terms & conditions for full details.
The Laser Lab Source group websites include:
  • LaserDiodeSource.com
  • LaserLabSource.com
  • LaserDiodeControl.com

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Select Cables and Accessories for this Controller


This cable is also available terminated on the
controller end with a 15-pin d-sub connector (male) and
15-pin d-sub connector (female) on the device-end (kab-231).


This cable is also available terminated on the
controller end with a 15-pin d-sub connector and
unterminated on the device-end (kab-39).

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MODEL LDI-186
PRICE $1095.00
Laser Diode Current Output
  • Output Current Range: 0.00 - 1500.00 mA
  • Compliance Voltage Range: 14.00 Volts
  • Current Setpoint Accuracy: ± 0.5%
  • Current Noise & Ripple (rms): < ± 0.5% of Full Scale Current
  • PD Power Monitoring Included
  • Current Setpoint Resolution: 4 μA
  • Current Stability (4 hours): ≤ 100 ppm
  • Current Limit Setpoint Accuracy: ± 2%
  • Photodiode Current Measurement Accuracy: ± 0.5%
  • Photodiode Current Measurement Range: 0.00 - 700 μA
INTEGRATED LASER DIODE PROTECTION FEATURES
  • Soft-Start Current Ramp to Setpoint (User Programmable)
  • Soft-Start Current Ramp Factory Default Set to 300 Milliseconds
  • User-Programmable Current Limit
  • Open Circuit Detection; Short Circuit when Laser Diode Current Turned OFF
  • ESD and Power Surge Clamp, AC Line Filter
  • Reverse Voltage Transient Clamp
  • Electronic Safety Interlock Connection
  • Short Circuit when Laser Diode Current Turned OFF
QCW PULSING MODE & MODULATION
  • QCW Mode Rise/fall: <15 µs (optional <5µs)
  • Integrated QCW Pulse Generator, Also Accepts External Trigger for QCW Pulses
  • QCW Mode 1: User Adjustable Pulse Width and Repetition Rate using Internal Pulse Generator
  • QCW Mode 2: External Trigger to Internal Pulse Generator: Rising Edge Triggered QCW Pulse with Internally Adjusted Pulse Width
  • Modulation Input: BNC, Digital (TTL) or Analog, 10kΩ Impedance
  • ---------------------------------------------------------------------------------------------
  • Modulation Input Voltage Range: 0 ~ 4 Volts (4V = Max Current)
  • Analog Modulation Bandwidth: 1 Hz – 20 kHz
auxiliary functions
  • Laser Active LED Output; 4 - 5V, 5mA Output
  • Pilot Laser Anode, vs. Ground: (4 - 5V, 150 mA)
  • Temperature Sensor Input: 10kΩ NTC Thermistor
  • External Fan Control Circuit, 1 - 24V, 500mA (max)
USER INTERFACE AND CONNECTORS
  • RS232 Standard: SubD-9, Female
  • LabView Drivers Included
  • USB Optional: $95.00 (Option SVC-USB)
  • Laser Connector: SubD-15, Female
  • Power and Support Connector: SubD-9, Male
  • RS232 Connector: SubD-9, Female
Input Power Requirements
  • The LDI-186 requires a 24 VDC power supply; the power supply can be supplied by the customer or it can be purchased as an option with the LDI-186 ~ please refer to the link to the RLS/LDC-PS120 on right side of this product page to see the optional power supply
Dimensions
  • 44 mm (Height) x 105 mm (Width) x 160 mm (Depth)
Recommended Accessories
  • kab-39 Unterminated Connecting Cable -or-
    kab-231 Terminated Connecting Cable
  • nt-82 24 VDC / 90 W Power Supply
  • acc-417 USB-RS232 Converter

Product Overview:

LDI Series Laser Diode Driver Modules

The LDI series laser diode diode drivers are precision-engineered to electrically bias laser diodes while protecting them from the common causes of damage which can potentially harm or destroy semiconductor lasers.

Laser Diode Protection Features

These units offer the highest level of commercially available laser diode protection to ensure that your laser is protected from damage. Current and voltage limits, laser diode temperature limit, and a fast shut-down sequence keep your device protected at all times. The following protection features combine to safeguard your laser diode:
  • Polarity Check: A dedicated circuit biases the laser with a very small power level to ensure that it is installed properly to prevent damage caused by incorrect wiring.
  • Soft-Start Current Ramp: Gradually increases current to prevent sudden surges that could damage the laser diode. The LDC series units offer the ability for the user to customize the ramp time if desired. The factory default is set to 300 milliseconds.
  • Over-current Protection: Prevents excessive current from flowing into the laser diode.
  • Over-voltage Protection: Limits the voltage applied to the laser diode.
  • Reverse Voltage Protection: Protects against accidental polarity reversal which can permanently damage the diode.
  • Thermal Shutdown: Monitors the laser temperature and automatically shuts down if over-heating occurs.
  • Current Limit: Allows users to define a maximum current threshold to safeguard the diode.
  • Compliance Voltage Limit: Ensures the voltage supplied to the diode remains within safe operating conditions.
  • Transient Suppression: Filters out power supply transients and electrical noise that could cause instability.
  • Short-Circuit Protection: Detects and prevents damage caused by accidental short circuits in the laser diode current circuit.
  • Interlock Safety Mechanism: Requires an external hardware switch or key to enable laser operation, adding an extra layer of safety.

Constant Current Source Laser Diode Driver

The LDI series drivers are based on high stability, low-noise current source topology to ensure optimal performance from your laser diode. They provide exceptionally low drift, allowing for consistent and repeatable results. The constant current source topology is based on a precision sense resistor which is placed in series with the laser diode. The voltage across this sense resistor is fed into a differential amplifier, which compares it to the reference voltage. If the measured current deviates from the setpoint, the feedback loop adjusts the control voltage applied to the pass transistor (MOSFET). The transistor acts as a variable resistor, dynamically adjusting to maintain the desired current. The current source automatically adjusts its output voltage to meet the laser's requirements while keeping the current constant.

Modulation, Internal Function Generator and QCW Modes

In addition to CW (continuous wave) mode of operation, the LDI series laser diode drivers offer flexible modulation capabilities and a built-in QCW function generator. The rear panel of the controller has a BNC input for analog or TTL digital modulation inputs with a 10k Ω input impedance. The controller has an internal function generator which can be used to set the quasi-CW (QCW) pulses. In QCW mode, the user can also set QCW pulses from a remote TTL signal source or by using the internal function generator.

RS232 & USB Interfaces | Analog Signal Controls

These driver modules offer multiple user interface options. For remote control, all models come standard with a RS-232 interface and USB adapter. For all models, the LabView GUI (included) makes set-up and control of the system fast and simple. An open-source terminal software program is also available for download. The user can also control the unit using analog controls signal inputs available on the rear panel.

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