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20 Amp, 30 Volt High Compliance Voltage Laser Diode Driver

  • LDI-726 Laser Diode Driver Front Panel
  • LDI-726 20A, 30V, Diode Laser Driver Backpanel
  • LDI-726 20A, 30V, Diode Laser Packages
  • 20A High Voltage Laser Diode Driver Pinout
  • LDI rear panel of laser diode driver
  • LDI-726 20A, 30V, Diode Laser Control Software

$3693.00  
sku / item#: LDI-726 | (previous part# LDC-250HV)
ships: 3 weeks

Key Features
  • High Compliance Voltage for Multi-Chip Emitters and Laser Diodes Connected in Series
  • Compliance Voltage Range up to 30 Volts at 20 Amps
  • User Configurable Soft-Start Current Ramp and Multiple Layers of Laser Diode Protection
  • CW and QCW Pulsed Modes of Operation
  • QCW Pulse Width Range < 25 μs to CW
  • RS232 Interface with LabVIEW Drivers; USB Control Available as an Option
  • Offered by OsTech, a Laser Lab Source Marketplace Seller
  • Sold & Supported in North America by: LaserDiodeControl.com, part of the
    Laser Lab Source Marketplace Group

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MODEL LDI-726 | (previous part# LDC-250HV)
PRICE $3693.00
LASER DIODE DRIVER output (CURRENT and voltage SOURCE)
  • Output Current Range: 0.00 - 20.00 Amps
  • Compliance Voltage Range: 0.00 - 30.00 Volts
  • Current Noise & Ripple (rms): <± 0.5% of Full Scale Current
  • Current Setpoint Resolution: 5 mA
  • Current Setpoint Accuracy: ± 0.5%
  • Current Stability (4 hours): ≤ 200 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 Factory Default Set to 300 Milliseconds; User Adjustable
  • User-Programmable Current Limit
  • Open Circuit Detection; Fast, Safe Shut-off
  • Short Circuit when Laser Diode Current Turned Off
  • ESD and Power Surge Clamp, AC Line Filter
  • Reverse Voltage Transient Clamp
  • Rear Panel Keylock Switch and Safety Interlock
  • Front Panel e-Stop Button Emergency Shut-Down
MODULATION and QCW (Quasi-CW) MODE
  • Pulse Width Range < 25μs to CW, 10%-90% (< 10μs on request)
  • Integrated QCW Pulse Generator, also Accepts External Trigger for QCW Pulses
  • Pulse Time Base Accuracy: ± 1.0% QCW Mode Trigger: Internal (Integrated) Function Generator or External Trigger
  • QCW Mode Trigger: Internal (Integrated) Function Generator or External Trigger
  • Modulation Input & Output: BNC, Digital (TTL) or Analog, 10kΩ Impedance
  • Modulation Input Voltage Range: 0 ~ 4 Volts (4V = Max Current)
auxiliary functions and connections
  • Laser On/Off Status Indication (TTL; On = High), vs. Gnd
  • Pilot Laser Output, vs. Gnd
  • Photodiode Cathode, vs. Gnd
  • External Temperature Sensor Input (NTC 10kΩ @ 25°C), vs. Gnd
  • External Cooling Fan Output (1 - 24V, 800 mA) , vs. Gnd
User INTERFACE and Connectors
  • Front Panel: Alphanumeric LCD with Key Pad
  • RS232 Standard, SubD-9, Female
  • USB Optional: $95.00 (Option SVC-USB)
  • LabView Drivers Included
  • Laser Diode Connector: SubD-2W2, Female
  • Auxiliary Functions Connector: SubD-15 female
  • RS232 Connector: SubD-9, Female
  • Safety Interlock: Jack Connector, Stereo 3.5mm
DIMENSIONS AND POWER INPUT
  • Power Input: Universal 100V ~ 240 VAC, 50/60 Hz
  • Dimensions: 127 mm (H) x 200mm (W) x 275 mm (L)

Product Overview:

LDI-726 High Power Laser Driver Overview

The LDI-726 driver offers 30 Volts compliance voltage at 20 Amps for laser diodes connected in series, laser diode stacks and multi-emitter devices. On request, the current and voltage can be configured to match any customer specified range with a total of 600 Watts of output power to the laser. The LDI-726 was designed with features to protect expensive multi-emitter pumps, and are used to safely bias 8XX through 9XXnm pumps with output power levels from 20 Watts to 300 Watts from companies such as Lumentum and II-VI laser.

Laser Diode Protection Features

To ensure that the series connected array of diode lasers is not damaged or destroyed, the LDI-726 offers voltage transient protection and voltage clamping circuitry in addition to a user-set current limit. In addition to the current and TEC limits, there is an interlock safety connection as well as a front panel Emergency-Stop kill switch to ensure safe operation of the laser.

The LDI-726 offers the industries only user-set slow-start current ramp to the bias set point. This allows the user to extend the ramp time out to 10’s of seconds to prevent the possibility of thermal shock and prevent over driving the module during the start up sequence. These units ship with a default 300 milliseconds current ramp.

Also included is the ability to control an external cooling fan: a temperature sensor input is available on the back panel, and the external fan control is capable of driving up to 500 mA at 24 V.

CW- and Quasi-CW Modes of Operation

In addition to CW (continuous wave) mode of operation, the LDI-726 offers flexible modulation capabilities and an integrated QCW mode. The user can apply a TTL digital or analog modulation input through the rear panel BNC. The controller has an internal function generator which can be used to set the modulation signal or the quasi-CW pulses with a time base accuracy of 1.0%. In QCW mode, the user can also set the pulses from a remote TTL signal source.

User Interface and Cable Connectors:

Controller setup is fast and intuitive via the front panel LCD display and alphanumeric interface, with a simple to use menu structure and key pad.

The controller employs a high-current two-pin connector, type DSUB-2W2, for connection to the high-power laser diode module.

These systems come with standard an RS-232 interface. The included LabView driver GUI makes set-up and control of the system fast and simple. The controller can be ordered with a USB interface; contact us for more information.

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