Item #	LDC4005	LDC4020
Laser Current Control Range	0 to 5 A	0 to 20 A
Compliance Voltage	12 V	11 V
Photocurrent Measurement Ranges	2 mA / 20 mA
Power Monitor Voltage Measurement Ranges	10 mV / 100 mV / 1 V / 10 V
QCW* Pulse Width Range	100 µs to 1 s
QCW* Repetition Rate Range	1 ms to 5 s (0.2 to 1000 Hz)
Internal Modulation Waveforms	Sine, Square, Triangle
Internal Modulation Small Signal Bandwidth	20 Hz to 100 kHz	20 Hz to 50 kHz

*Quasi-Continuous Wave

Laser Diode Controller Features

Two Models for 5 A and 20 A Laser Currents
Operate with Anode- or Cathode-Grounded
Laser Diodes and Photodiodes
Also Capable of Driving LEDs in CW
Continuous Wave or Quasi-Continuous Wave Operation
Internal Function Generator for Analog Modulation
External Modulation Input
Analog Monitor Output for the Laser Current
Laser Diode Voltage Measurement
Power Efficient by Active Power Management
Compatible Optical Detectors:
- Photodiodes
- Thermopiles
- Sensors with Amplifier
- Power Meters
Control Modes:
- Constant Current (CC)
- Constant Power (CP)
Enhanced Laser Diode Protection Features:
- Adjustable Laser Current Limit
- Adjustable Laser Power Limit
- Laser Over-Voltage Protection
- Over Temperature Protection
Interface and Drivers:
- USB Interface (SCPI compliant)
- VXIpnp/VISA Drivers for all Common Programming Environments like LabWindows/CVI™, LabVIEW™, and MS Visual Studio™

The LDC4000 Series of Laser Diode Current Controllers provide precise and stable current for driving high-power laser diodes with injection currents up to 20 A. This series supports all laser diode and monitor diode pin configurations and features a constant current or constant power mode. The series is designed for stand-alone operation and is controlled via front panel keys and intuitive operation menus on a large and easy-to-read graphic LC display. See the Display Screens tab for some examples. Additionally, the LDC4000 Series can be fully remote controlled via an SCPI compatible USB Interface. A higher setting resolution and measurement resolution is offered via remote control.

Compared to the LDC200C Series, the LDC4000 Series offers higher injection currents as well as additional features like the Quasi-Continuous Wave (QCW) operation mode, an internal modulation generator, a thermopile input, laser voltage measurement, and an optical power limit. These features, together with the new design, which offers silent and efficient operation, make the LDC4000 Series Laser Diode Controllers an ideal choice for most applications.

For more information about the constant current and constant power modes, the photodiode and thermopile monitor inputs, the continuous wave (CW) or quasi-continuous wave (QCW) operation and the enhanced protection features for the laser diodes please see the More Info tab.

Companion Products

The TED4015 TEC Controller is the ideal companion for the LDC4000 Series Controllers. When combined with our TEC laser mounts, the TED4015 can achieve a thermal stability of 0.001 °C. This temperature stability is required for applications like diode laser wavelength tuning and atomic absorption cell spectroscopy.

Constant Current and Constant Power Modes

The laser diodes can be driven in either constant current (CC) or constant power (CP) mode. In CC mode, the laser current is held precisely at the level set by the user. The CC mode is ideal when the lowest noise and highest response speed is required. In CP mode, the monitoring optical sensor is used to actively stabilize the output power of the laser. A feedback circuit controls the output power of the laser. A power limit can be set to restrict the control loop to a maximum laser output power. To ensure best possible performance, laser diodes are driven with respect to ground, offering significant advantages regarding noise, transient suppression, and stability.

100 µs Pulses of 20 A

QCW Pulse Operation of the Laser Diode Controller

Figure: Oszilloscope screenshot of a typ. short 100 µs Pulse of 20.0 A generated by the LDC4020 in QCW mode

Photodiode and
Thermopile Monitor Input

The LDC4000 Series allows the user to select photodiodes or thermopiles as the sensor for monitoring the laser diode power output. For each, a monitor input is provided. The photodiode input provides two ranges: 2 mA or 20 mA maximum current. An adjustable-bias voltage can be applied to the photodiode to improve the linearity. The thermopile input provides four ranges: 10 mV, 100 mV, 1 V, or 10 V maximum voltage. Instead of bare thermopile sensors, sensor amplifiers or power meters with analog voltage output can be connected here as well. Both monitor inputs can be calibrated by a sensor response parameter to directly display the optical power in milliwatts.

Continuous Wave (CW) or Quasi-Continuous Wave (QCW) Operation

The LDC4000 Series can be operated in continuous wave (CW) or quasi-CW (QCW) mode. The LDC4020 is at ease providing sharp and accurate 100 µs pulses of 20 A peak current without any unwanted overshoots. The integrated pulse generator can be triggered internally with an adjustable repetition rate or externally via a BNC jack at the rear of the unit.

Enhanced Protection Features
for the Laser Diode

For optimal LD protection, the LDC4000 Series offers a set of enhanced protection features. Independent of operation mode or compliance voltage, a precisely adjustable current limit ensures that the maximum allowed laser current cannot be exceeded. The LDC will return an error signal whenever this pre-set limit is reached by user settings or external modulation. The soft start feature ensures a slow increase of the laser current without voltage peaks after the device is switched on. Voltage peaks on the AC line are effectively suppressed by electrical filters and by careful grounding of the chassis. Even in the case of power line failure, the laser current remains transient-free. When the output is disabled, the laser is additionally protected by an electronic output short circuit. If the connection between current source and laser diode is interrupted, or the laser voltage exceeds the adjustable voltage protection threshold, the laser current is switched off.

Item #	LDC4005		LDC4020
	Front Panel*	Remote Control*	Front Panel*	Remote Control*
Current Control (Constant Current Mode)
Control Range	0 to 5 A		0 to 20 A
Compliance Voltage	12 V		11 V
Setting / Measurement Resolution	1 mA	80 µA	1 mA	320 µA
Accuracy	±(0.1% + 2 mA)		±(0.1% + 8 mA)
Noise and Ripple (10 Hz to 10 MHz, rms, typ.)	<250 µA		<10 mA
Drift, 24 hours (0-10 Hz, typ., at Constant Ambient Temperature)	<300 µA		<1 mA
Temperature Coefficient	<50 ppm/°C
Current Limit
Setting Range	5 mA to 5 A		20 mA to 20 A
Resolution	1 mA	80 µA	1 mA	320 µA
Accuracy	±(0.12% + 3 mA)		±(0.12% + 12 mA)
Power Monitor Input - Photodiode
Photocurrent Measurement Ranges	2 mA / 20 mA
Photocurrent Measurement Resolution	1 µA / 10 µA	32 nA / 320 nA	1 µA / 10 µA	32 nA / 320 nA
Photocurrent Accuracy	±(0.08% +0.5 µA) / ±(0.08% +5 µA)
Photodiode Reverse Bias Voltage	0 to 10 V
Photodiode Input Impedance	~0 Ω (Virtual Ground)
Power Monitor Input - Thermopile**
Voltage Measurement Ranges	10 mV / 100 mV / 1 V / 10 V
Voltage Measurement Resolution (for 10 mV / 100 mV / 1V / 10 V Range)	1 µV / 10 µV / 100 µV / 1 mV	0.16 µV / 1.6 µV / 16 µV / 160 µV	1 µV / 10 µV / 100 µV / 1 mV	0.16 µV / 1.6 µV / 16 µV / 160 µV
Voltage Measurement Accuracy (for 10 mV / 100 mV / 1V / 10 V Range)	±(0.1% + 10 µV) / ±(0.1% + 100 µV) / ±(0.1% + 1 mV) / ±(0.1% + 5 mV)
Voltage Input Resistance	1 MΩ
Constant Power Control
Photocurrent Control Ranges	0 to 2 mA / 0 to 20 mA
Photocurrent Setting Resolution	1 µA / 10 µA	32 nA / 320 nA	1 µA / 10 µA	32 nA / 320 nA
Voltage Control Ranges	1 µV to 10 mV / 10 µV to 100 mV / 100 µV to 1V / 1 mV to 10 V
Voltage Setting Resolution	1 µV / 10 µV / 100 µV / 1 mV	0.16 µV / 1.6 µV / 16 µV / 160 µV	1 µV / 10 µV / 100 µV / 1 mV	0.16 µV / 1.6 µV / 16 µV / 160 µV
Power Limit
Photocurrent Limit Setting Ranges	5 µA to 2 mA / 50 µA to 20 mA
Photocurrent Limit Resolution	1 µA / 10 µA	128 nA / 1.28 µA	1 µA / 10 µA	128 nA / 1.28 µA
Photocurrent Limit Accuracy	±20 µA / ±200 µA
Sensor Voltage Limit Setting Ranges	10 µV to 10 mV / 100 µV to 100 mV / 1 mV to 1V / 10 mV to 10V
Sensor Voltage Limit Resolution	1 µV / 10 µV / 100 µV / 1 mV	730 nV / 7.3 µV / 73 µV / 730 µV	1 µV / 10 µV / 100 µV / 1 mV	730 nV / 7.3 µV / 73 µV / 730 µV
Sensor Voltage Limit Accuracy	±10 µV / ±100 µV / ±1 mV / ±10 mV
Laser Voltage Measurement
Measurement Principle	4-Wire
Measurement resolution	1 mV	160 µV	1 mV	160 µV
Accuracy	±20 mV
Laser Overvoltage Protection
Setting Range	1 V to 11 V
Resolution	1 mV	650 µV	1 mV	650 µV
Accuracy	±100 mV
Laser Current Monitor Output
Load Resistance	>10 kΩ
Transmission Coefficient	2 V/A ±5%		500 mV/A ±5%
External Modulation Input
Input Impedance	10 kΩ
Small Signal 3dB Bandwidth, CC Mode	DC to 100 kHz		DC to 50 kHz
Modulation Coefficient, CC Mode	500 mA/V ±5%		2A/V ±5%
Modulation Coefficient, CP Mode, Current Sensor	200 µA/V / 2 mA/V ±5%
Modulation Coefficient, CP Mode, Voltage Sensor	10 mV/V / 100 mV/V / 1V/V ±5%
Internal Modulation
Waveforms	Sine, Square, Triangle
Frequency Range	20 Hz to 100 kHz		20 Hz to 50 kHz
Modulation Depth	0.1 to 100%
QCW Mode
Pulse Width Range	100 µs to 1 s
Pulse Width Resolution	1 µs
Repetition Rate Range	1 ms to 5 s (0.2 to 1000 Hz)
Repetition Rate Resolution	10 µs
Trigger
Input	Rising Edge Triggered, Starts QCW Pulse with Internal Adjusted Width
Input Level	TTL or 5 V CMOS
Output	Active High, Tracks Pulse Width
Output Level	TTL or 5 V CMOS
Death Time to Next Pulse	>10 µs
Digital I/O Port
Number of I/O Lines	4 (Separately Configurable)
Input Level	TTL or CMOS, Voltage Tolerant up to 24 V
Output Level (Source Operation)	TTL or 5 V CMOS, 2 mA MAX.
Output Level (Sink Operation)	Open Collector, up to 24 V, 400 mA MAX.
Interface
USB2.0	According to USBTMC/USBTMC-USB488 Specification Rev. 1.0
Protocol	SCPI Compliant Command Set
Drivers	VISA VXI pnp™, MS Visual Studio™, MS Visual Studio.net™, LabView™, LabWindows/CVI™
General data
Safety Features	Interlock, Inhibit, Keylock Switch, Laser Current Limit, Laser Power Limit, Soft Start, Short Circuit when Laser off, Adjustable Laser Overvoltage Protection, Over Temperature Protection Temperature Window Protection (only in combination with TED4015)
Display	LCD 320 x 240 Pixel
Connector for Laser, Photodiode, Interlock & Laser On Signal	13W3 Mixed D-Sub Jack (female)
Connectors for Control Input / Output	BNC
Connector for USB-Interface	USB Type B
Chassis Ground Connector	4 mm Banana Jack
Line Voltage / Frequency	100 to 120 V and 200 to 240 V ±10%, 50 to 60 Hz
Maximum Power Consumption	200 VA		600 VA
Operating Temperature	0 to 40°C
Storage Temperature	-40 to 70°C
Warm-up Time for Rated Accuracy	20 min
Weight	5.5 kg
Dimensions without Operating Elements (W x H x D)	263 mm x 122 mm x 307 mm
Dimensions with Operating Elements (W x H x D)	263 mm x 122 mm x 345 mm

*Via front panel the resolution is limited by the display. Via Remote Control a higher resolution is offered.
**The Thermopile Power Monitor Input can also be used for sensor amplifiers and power meters with voltage output.
All technical data valid at 23 ± 5°C and 45 ±15% relative humidity. Subject to change without notice.

LDC Front Panel

Click to Enlarge

Callout	Connection	Callout	Connection
1	Key Switch	5	Escape Key
2	Supply Power Switch	6	LD Status Indicator
3	LC Display	7	Adjustment Knob
4	Softkeys for Menu Navigation	7	Adjustment Knob

LDC Back Panel

Click to Enlarge

Callout	Connection	Callout	Connection
1	TTL Input "Laser Enable In" 5 V Max	8	Cooling Fan
2	TTL Input "QCW Pulse In" 5 V Max	9	LD Output and Optical Sensor Input "Laser Output"
3	TTL Output "Trigger Out" 0 - 5 V	10	Power Connector and Fuse Holder "Line In"
4	Optical Sensor Input "Opt Sensor In" 0 - 10 V Max	10	Power Connector and Fuse Holder "Line In"
5	Modulation Input "Modulation In" -10 to 10 V	11	USB Connector
6	Laser Current Monitor "Analog CTL Out" 0 - 10 V	12	4 mm Banana Jack for Chassis Ground
7	Serial Number of the Unit	13	MiniDin-6 Jack "Digital I/O"

13W3 Mixed D-Sub Jack Pin Configuration

Connector Drawing

Pin	Connection	Pin	Connection
1	(Thermo) Voltage Sensor Input (+)	7	Photo Current Sensor Input (+)
2	(Thermo) Voltage Sensor Ground (-)	8	Photo Current Sensor Ground (-)
3	Not Connected	9	Not Connected
4	Laser Diode Anode (+)	10	Laser Diode Cathode (-)
5	Output for Interlock and Status Indicator “LASER ON/OFF” (+)	A1	Laser Diode Ground
6	Ground Pin for Interlock and Status Indicator “LASER ON/OFF” (-)	A2	Laser Diode Cathode (with Polarity AG) (-)
6		A3	Laser Diode Anode (with Polarity CG) (+)

Digital I/O Ports

Pin	Connection
1	I/O 1
2	I/O 2
3	I/O 3
4	I/O 4
5	GND
6	I/O Supply Voltage (+12 V from internal or higher external voltage up to +24 V)

LD Enable In

BNC Female

Laser Enable Input (high to enable laser ON), TTL 5 V max

QCW Pulse In

BNC Female

Input for external trigger signal, TTL 5 V Max

Trigger Out

BNC Female

QCW puls tracking output, TTL 5 V

OPT Sensor In

BNC Female

Input for optical sensor, 0 ... +10 V max

Modulation In

BNC Female

Input for external modulation signal, -10 ... + 10 V max

Analog CTL Out

BNC Female

Output for laser current monitoring, 0 ... +10 V

Computer Connection

USB Type B

USB Type B to Type A Cable Included

Ground

Banana Plug

4 mm banana jack for chassis ground

CAB4005 Laser Diode Cable

This cable contains a DB-9 male connector on one side and a 13W3 male connector on the other side. Both views shown below are looking into the connector.

DB-9 Male Connector

13W3 Male Connector

Pin Matching
DB-9 Pin	13W3 Pin
1	5
2	8
3	A1
4	7
5	6
6	10
7	A2
8	A3
9	4
Shield	Shield

DB-9 Connector Colors
Pin	Color
1	White
2	Gray and Pink
3	Gray and Black
4	Red and Blue
5	Brown
6	Blue
7	Yellow and Purple
8	Green and Pink
9	Red

13W3 Connector Colors
Pin	Color	Pin	Color
1	No Connection	8	Green and Pink
2	No Connection	9	No Connection
3	No Connection	10	Blue
4	Red	A1	Gray and Black
5	White	A2	Yellow and Purple
6	Brown	A3	Green and Pink
7	Red and Blue	A3	Green and Pink

Sample Screens of the LDC4000 Series

Measurement Screen		Menu Screen
	The measurement screen offers an easy readout of measurement values and device status information. It also allows to adjust the major instrument setpoints. You can freely select two, four, or six values to be displayed with optimized character size.		The menu screen allows selecting various operation modes and options.
Laser Diode Setup Screen		Photodiode Input Screen
	The laser diode setup screen allows to enter essential laser control parameters: constant current or constant power mode, limits for laser current and laser power, speed and source of the constant power feedback loop.		Via the photodiode input screen, all parameters concerning the photodiode sensor are entered.
QCW Settings Screen		Preferences Screen
	This is the input screen for the Quasi-Continous Wave (QCW) pulse mode settings, e.g. trigger source and pulse parameters.		The preferences screen offers access to the device preferences, e.g. display and signal settings.

Software for the LDC4000 Series

Use this link to download the below software packages:

The available software is organized into the following categories:

Drivers: Instrument drivers to directly operate the device via external software to extend or adapt the functionality to user specific requirements.
Utility Module: Thorlabs Device Firmware Upgrade Wizard to install new firmware.
Utility Module: Thorlabs Instrument Communicator 2 for instrument communication functionality.

LDC4000 Series Shipping List

LDC4005	LDC4020	Part
x		Benchtop Laser Diode Controller, 5 A / 10 V
	x	Benchtop Laser Diode Controller, 20 A / 10 V
x		Cable LDC4000/ITC4000 to laser mount, 5 A, 13W3, D-Sub-9 (CAB4005)
	x	Cable LDC4000/ITC4000 to laser mount, 20 A, 13W3, 13W3 (CAB4006)
x	x	Mixed D-Sub Connector, 13W3, male & female with 3 high current contacts each, 20 A (CON4005)
x	x	USB Cable A-B, 2 m
x	x	Instrumentation CD Series 4000
x	x	Printed Operation Manual LDC4000 Series
x	x	Certificate of Calibration

Laser Diode Controller Selection Guide

The table below is designed to give a quick overview of the key specifications for our laser diode controllers. For more details and specifications, or to order a specific item, click on the appropriate item number below.

Item #	Drive Current	Compliance Voltage	Modulation	Package
LDC200CV	20 mA	6 V	External	Benchtop
VLDC002	25 mA	5 V	Int/Ext	OEM
VITC002	25 mA	5 V	Int/Ext	OEM
LDC201CU	100 mA	5 V	External	Benchtop
LD2000	100 mA	3.5 V	External	OEM
LD2000R	100 mA	3.5 V	External	OEM
EK2000	100 mA	3.5 V	External	OEM
LDC202C	200 mA	10 V	External	Benchtop
TLD001	200 mA	8 V	External	T-Cube
IP250-BV	250 mA	8 V^c	External	OEM
LD1100	250 mA	6.5 V^c	--	OEM
LD1101	250 mA	6.5 V^c	--	OEM
EK1101	250 mA	6.5 V^c	--	OEM
EK1102	250 mA	6.5 V^c	--	OEM
LD1255R	250 mA	3.3 V	External	OEM
LDC205C	500 mA	10 V	External	Benchtop
IP500	500 mA	3 V	External	OEM
LDC210C	1 A	10 V	External	Benchtop
LDC220C	2 A	4 V	External	Benchtop
LD3000	2.5 A	--	External	OEM
LD3000R	2.5 A	--	External	OEM
LDC240C	4 A	5 V	External	Benchtop
LDC4005	5 A	10 V	Int/Ext	Benchtop
LDC4020	5 A	10 V	Int/Ext	Benchtop
Dual Temperature and Current Controllers
LDC1300B	1 A	5 V	--	OEM
ITC4001	1 A	>10 V	Int/Ext	Benchtop
ITC4005	5 A	>10 V	Int/Ext	Benchtop
ITC4020	20 A	>10 V	Int/Ext	Benchtop

^a Constant Current
^b Constant Power
^c When using a 12 V Power Supply

We also offer a variety of rack mounted laser diode current & temperature controllers (OEM Modules, TXP Rack Modules, PRO8 Rack Modules)

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Posted Comments:

Poster: sharrell

Posted Date: 2012-03-06 09:58:00.0

A Response from Sean at Thorlabs: Thank you for your feedback! The ITC current / temperature controllers are essentially a combination of an LDC4000 controller and the TED4015 temperature controller. For example, the ITC4005 will have the same controller specifications as the LDC4005. There is more we can do to simplify the process of selecting the right controller, and we will start by adding a selection guide to our current controller pages, which will list key specifications for our entire current controller line. If you require any further assistance selecting a controller, feel free to email techsupport@thorlabs.com and an applications engineer will be happy to help.

Poster:

Posted Date: 2012-03-05 14:26:52.0

I'm picking out current and temperature controllers. It's nice that you have the two ITC specs side by side for comparison, but it would be nice if you also had the specs of the LDC line here for quick comparison.

Poster: jjurado

Posted Date: 2011-02-16 14:09:00.0

Response from Javier at Thorlabs to zylv: Thank you for contacting us with your request. The LDC4020 shorts the pin A1 A2 and A3 when the laser diode current is not switched on. The shorting of those pins is required in order to ensure that the laser diode has a zero potential difference between its pins, when it is not in use. The fact that you cannot source any current with the driver might be related to a connection problem between the laser diode and the LDC or simply that the polarity is not set properly. We would be happy to help you further with the troubleshooting. I will follow up with you directly.

Poster: zylv

Posted Date: 2011-02-16 14:02:48.0

LDC4020 could not output the current, I found the Pin A1 A2 and A3 were connected together. could you tell me how fix this issue? This product was dilivered to me yesterday. It is totally new.

Poster: Thorlabs

Posted Date: 2011-01-19 10:23:34.0

Response from Javier at Thorlabs to aoceron: Thank you very much for submitting your inquiry. The LDC4020 laser diode current controller is designed for benchtop use. We currently do not offer a rack mounting kit for this unit. We do provide, however, 19" rack mounting kits for our PRO8000 chassis, which is designed to hold laser diode test and experimentation modules: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=895&pn=PRO8000

Poster: aoceron

Posted Date: 2011-01-18 22:23:41.0

I was told to use the RK4101 rack-mount kit for the LDC4020, but this wont hold it fix to a 19" rack. Do you have a rack-mount for the LDC4020? or do you have an LDC4020 that is rack-mountable into a 19" rack? Thank you.

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View All »Matching Part Numbers

High Power Laser Diode Controllers

Laser Diode Controller Features

Companion Products

Constant Current and Constant Power Modes

100 µs Pulses of 20 A

Photodiode and
Thermopile Monitor Input

Continuous Wave (CW) or Quasi-Continuous Wave (QCW) Operation

Enhanced Protection Features
for the Laser Diode

LDC Front Panel

LDC Back Panel

13W3 Mixed D-Sub Jack Pin Configuration

Digital I/O Ports

LD Enable In

BNC Female

QCW Pulse In

BNC Female

Trigger Out

BNC Female

OPT Sensor In

BNC Female

Modulation In

BNC Female

Analog CTL Out

BNC Female

Computer Connection

USB Type B

Ground

CAB4005 Laser Diode Cable

Sample Screens of the LDC4000 Series

LDC4000 Series Shipping List

Laser Diode Controller Selection Guide

View All »Matching Part Numbers

High Power Laser Diode Controllers

Laser Diode Controller Features

Companion Products

Constant Current and Constant Power Modes

100 µs Pulses of 20 A

Photodiode and Thermopile Monitor Input

Continuous Wave (CW) or Quasi-Continuous Wave (QCW) Operation

Enhanced Protection Features for the Laser Diode

LDC Front Panel

LDC Back Panel

13W3 Mixed D-Sub Jack Pin Configuration

Digital I/O Ports

LD Enable In

BNC Female

QCW Pulse In

BNC Female

Trigger Out

BNC Female

OPT Sensor In

BNC Female

Modulation In

BNC Female

Analog CTL Out

BNC Female

Computer Connection

USB Type B

Ground

CAB4005 Laser Diode Cable

Sample Screens of the LDC4000 Series

LDC4000 Series Shipping List

Laser Diode Controller Selection Guide

Photodiode and
Thermopile Monitor Input

Enhanced Protection Features
for the Laser Diode