Item #	ITC4001	ITC4005	ITC4020
Current Control Range	0 to 1 A	0 to 5 A	0 to 20 A
Compliance Voltage	11 V	12 V	11 V
Photocurrent Measurement Ranges	2 mA / 20 mA
*QCW Mode Pulse Width Range**	100 µs to 1 s
*QCW Repetition Rate Range**	1 ms to 5 s (0.2 to 1000 Hz)
TEC Current Range	-8 to +8 A	-15 to +15 A	-15 to +15 A
TEC Compliance Voltage	>12 V	>15 V	>15 V
TEC Output Power Max	>96 W	>225 W	>225 W
Temperature Range Max	-55 to +150 °C **
Supported Temperature Sensors	Thermistors, Pt100, Pt1000, AD590, AD592, LM335, LM235, LM135, LM35

*Quasi Continuous Wave
**The applicable control range depends on the sensor parameters.

Laser Diode Controller Features

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
- Common Sensor Amplifiers
- Power Meters with Voltage Output
Laser Diode 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

TEC Controller Features

Excellent Temperature Stability: 0.002 °C (24 hrs)
Digital PID Control with Separate P, I, D Settings
Auto PID Setting Function
Adjustable Temperature Sensor Offset
Compatible Temperature Sensors:
- NTC-Thermistors
- Current Temperature Sensors
- Voltage Temperature Sensors
- Platinum RTD Temperature Sensors

TEC Control Modes:

Constant Temperature
Constant Current

Enhanced TEC Security Features:

Adjustable TEC Current Limit
Adjustable Temperature Limits
Temperature Window Protection
Fault-Connection and Sensor Alarm

The devices of the ITC4000 Series are a laser diode current controller combined with a TEC elements controller. Essentially this is a combination of a LDC4000 Series Current Controller and a TED4015Temperature Controller. It has been designed to provide a precise, stable current for laser diodes with injection currents of 1 A up to 20 A and an excellent temperature stabilization of 0.002 °C within 24 hrs. It supports all laser diode and monitor diode pin configurations and features a constant current (CC) or constant power (CP) mode. Most common temperature sensors can be used, and the ITC4000 can be adapted to different thermal loads via a digital PID controller. It offers an auto PID setting function or separate control of the P, I, and D parameters. For more details about these features please see the More Info tab.

The ITC4000 devices are controlled via front panel keys and intuitive operation menus on a large and easy-to-read graphic LCD display (See the Display Screens tab for some sample screens). Additionally, the ITC4000 Series can be controlled by a SCPI compatible USB Interface. A higher setting and measurement resolution is offered via remote control operation since the front panel resolution is limited by the resolution of the display. Various outputs and a digital I/O port offer many control and connectivity options. The built-in function generator allows analog modulation of the laser output out of the box.

Many enhanced features like the Quasi-Continuous Wave (QCW) operation mode, easy auto PID setting, and diverse laser diode and TEC element protection features are provided. (See the More Info tab) These features, together with the new design, provide silent and power-efficient operation, make the ITC4000 Series the ideal choice for the precise and secure operation of medium to high power laserdiodes and LEDs in lab and production environments.

Laser Diode Operation Modes

The laser diodes can be driven in either Constant Current (CC) mode, where the laser current is held precisely at the level adjusted by the user, or Constant Power (CP) mode, where an optical power sensor is used to monitor the output power of the laser for active power control. The CC mode is preferable when the lowest noise and highest response speed are required, but this mode generally requires temperature stabilizing as well. In CP mode, a feedback from the internal photodiode integrated into most laser diode packages or from an external photodiode is used to actively stabilize the laser's output power.

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 ITC4020 in QCW mode

The ITC4000 Series offers two independent monitor inputs: one for photodiodes and one for thermopiles, both of which can be chosen for controlling the laser diode. The analog modulation via external input or the internal function generator allows modulation of the laser diode in CC and CP modes. A control output voltage proportional to the laser current is provided for monitoring purposes.

Pulsed Operation

Depending on the application, the ITC4000 Series of laser diode drivers can be operated in Continuous Wave (CW) or Quasi-CW (QCW) mode. For the latter the oszilloscope screenshot of a ITC4020 in QCW mode shows the quality of this controller series. The ITC4020 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

Current Limit: A precisely adjustable current limit ensures that the maximum laser current cannot be exceeded. Thorlabs has intentionally provided limited access to this feature to prevent accidental adjustment. An attempt to increase the laser drive current above the preset limit will result in a visible and short audible indicator. Even when utilizing the external modulation feature, the current limit setpoint cannot be exceeded.
Current Source: If the connection between the current source and laser diode is interrupted, the current source automatically switches off the current output. The open current circuit condition is indicated by the “OPEN” indicator on the controller and a short acoustic warning. The separate laser ON key switches the laser current on and off. When switched off, an electronic switch within the device short circuits the laser diode for added protection. After being switched on, a soft start ensures a slow increase of the laser current without voltage peaks. Even in the case of line failure, the laser current remains transient free. Voltage peaks on the AC line are effectively suppressed by electrical filters, shielding of the transformer, and careful grounding of the chassis.

TEC Controller

The ITC4000 Series contains a high-performance digital TEC controller for currents up to ±15 A. It offers an excellent temperature stability of 0.002 °C within 24 hrs together with the same enhanced safeguard and operation features similar to the TED4015 Series . The digital PID controller can adapt to different thermal loads by individual adjustable parameters or by the auto PID function. (For more details see TED4015 Series product page). The maximum control range of the temperature sensor input spans 100 Ω to 1 MΩ for thermistors and -55 to 150 °C for temperature sensing ICs or Platinum RTD sensors. The actual applicable temperature range is limited by the connected sensor and the thermal setup. For maximum TEC element protection, the ITC offers the same features as the TED4015. These protection features include an adjustable TEC output current limit and temperature sensor malfunction alerts.

The ITC4000 Series provides a monitoring signal proportional to the difference between actual and set temperature. An oscilloscope or an analog data acquisition card can be connected to the rear panel BNC connector to monitor the settling behavior with different thermal loads.

Item #	ITC4001		ITC4005		ITC4020
	Front Panel^a	Remote Control^a	Front Panel^a	Remote Control^a	Front Panel^a	Remote Control^a
Current Control (Constant Current Mode)
Control Range	0 to 1 A		0 to 5 A		0 to 20 A
Compliance Voltage	11 V		12 V		11 V
Setting / Measurement Resolution	100 µA	16 µA	1 mA	80 µA	1 mA	320 µA
Accuracy	±(0.1% + 500 µA)		±(0.1% + 2 mA)		±(0.1% + 8 mA)
Noise and Ripple (10 Hz to 10 MHz, rms, typ.)	<10 µA		<250 µA		<10 mA
Drift, 24 hours (0-10 Hz, typ., at Constant Ambient Temperature)	<100 µA		<300 µA		<1 mA
Temperature Coefficient	<50 ppm/°C
Current Limit
Setting Range	1 mA to 1 A		5 mA to 5 A		20 mA to 20A
Resolution	100 µA	16 µA	1 mA	80 µA	1 mA	320 µA
Accuracy	±(0.12% + 800 µA)		±(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	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^b
Voltage Measurement Ranges	10 mV / 100 mV / 1V / 10V
Voltage Measurement Resolution (for 10 mV, 100 mV, 1 V, 10 V Ranges)	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	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 Impedance	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	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 10V
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	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	1 µA / 10 µA	128 nA / 1.28 µA
Photocurrent Limit Accuracy	±20 µA / ±200 µA
Sensor Voltage Limit Setting Ranges	1 µV to 10 mV / 10 µV to 100 mV / 100 µV to 1V / 1 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	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	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	1 mV	650 µV
Accuracy	100 mV
Laser Current Monitor Output
Load Resistance	>10 kΩ
Transmission Coefficient	10 V/A ±5%		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 100 kHz		DC to 50 kHz
Modulation Coefficient, CC Mode	100 mA/V ±5%		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 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
TEC Current Output
Control Range	-8 to +8 A		-15 to +15 A		-15 to +15 A
Compliance Voltage	>12 V		>15 V		>15 V
Maximum Output Power	>96 W		>225 W		>225 W
Resolution, CC Mode	1 mA	0.1 mA	1 mA	0.1 mA	1 mA	0.1 mA
Accuracy	± (0.2% + 20 mA)		± (0.2% + 20 mA)		± (0.2% + 20 mA)
Noise and Ripple typ.	<10 mA rms		<10 mA rms		<10 mA rms
TEC Current Limit
Setting Range	0.1 A to 8 A		0.1 A to 15 A		0.1 A to 15 A
Resolution	1 mA	0.1 mA	1 mA	0.1 mA	1 mA	0.1 mA
Accuracy	± (0.2% + 10 mA)		± (0.2% + 10 mA)		± (0.2% + 10 mA)
NTC Thermistor Sensors
Resistance Measurement Range	100 Ω to 100 kΩ / 1 kΩ to 1 MΩ (2 Ranges)
Control Range Max.^c	-55 to +150 °C
Temperature Resolution	0.001 °C
Resolution (Resistance, 100 kΩ/1 MΩ Range)	0.1 Ω / 1 Ω	0.03 Ω / 0.3 Ω	0.1 Ω / 1 Ω	0.03 Ω / 0.3 Ω	0.1 Ω / 1 Ω	0.03 Ω / 0.3 Ω
Accuracy (100 kΩ/1 MΩ Range)	± (0.06% + 1 Ω / 5 Ω)
Temperature Stability (24 hours typ.)^c	<0.002 °C
Temperture Coefficient	<5 mK/°C
IC Sensors
Supported Current Temperature Sensors	AD590, AD592
Supported Voltage Temperature Sensors	LM335, LM235, LM135, LM35
Control Range with AD590	-55 to +150 °C
Control Range with AD592	-25 to +105 °C
Control Range with LM335	-40 to +100 °C
Control Range with LM235	-40 to +125 °C
Control Range with LM135	-55 to +150 °C
Control Range with LM35	-55 to +150 °C
Resolution	0.001 °C	0.0001 °C	0.001 °C	0.0001 °C	0.001 °C	0.0001 °C
Accuracy AD590 Current	± (0.04% + 0.08 µA)
Accuracy LM335/LM35 Voltage	± (0.03% + 1.5 mV)
Temperature Stability (24 hours)	<0.002 °C
Temperature Coefficient	<5 mK/°C
Pt100/Pt1000 RTD Sensors
Temperature Control Range	-55 to +150 °C
Resolution	0.001 °C	0.0003 °C	0.001 °C	0.0003 °C	0.001 °C	0.0003 °C
Accuracy (4-Wire Measurement)	±0.3 °C
Temperature Stability (24 hours)	<0.005 °C
Temperature Coefficient	<20 mK/°C
Temperature Window Protection
Setting Range Twin	0.01 to 100.0 °C
Protection Reset Delay	0 to 600 s
Window Protection Output	BNC, TTL
Temperature Control Output
Load Resistance	>10 kΩ
Transmission Coefficient	ΔT ^a 5V / T_win ±0.2 % (Temperature Deviation, scaled to Temperature Window)
TEC Voltage Measurement
Measurement Principle	4-Wire/2-Wire
Resolution	100 mV	40 mV	100 mV	40 mV	100 mV	40 mV
Accuracy (with 4-Wire Measurement)	±50 mV
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
USB 2.0	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™, Labwindos/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
Display	LCD 320 x 240 Pixel
Connector for Laser, Photodiode, Interlock, and 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	750 VA		800 VA		1000 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 /wo Operating Elements (W x H x D)	263 mm x 122 mm x 307 mm
Dimensions /w Operating Elements (W x H x D)	263 mm x 122 mm x 345 mm

^aVia front panel the resolution is limited by the display. Via Remote Control a higher resolution is offered.
^bThe Thermopile Power Monitor Input can also be used for sensor amplifiers and power meters with voltage output.
^cControl range and thermal stability depend on thermistor parameters.

All technical data valid at 23 ± 5 °C and 45 ± 15% relative humidity. Subject to change without notice.

ITC Front Panel

Click to Enlarge

Callout	Connection	Callout	Connection
1	Key Switch	5	Escape Key
2	Supply Power Switch	6	TEC Status Indicator
3	LC Display	7	LD Status Indicator
4	Softkeys for Menu Navigation	8	Adjustment Knob

ITC Back Panel

Click to Enlarge

Callout	Connection	Callout	Connection
1	TTL Input "Laser Enable In" 5 V Max	9	LD Output and Optical Sensor Input "Laser Output"
2	TTL Input "QCW Pulse In" 5 V Max	10	Power Connector and Fuse Holder "Line In"
3	TTL Output "Trigger Out" 0 - 5 V	11	USB Connector
4	Optical Sensor Input "Opt Sensor In" 0 to 10 V Max	12	4 mm Banana Jack for Chassis Ground
5	Modulation input "Modulation In" -10 to 10 V	13	MiniDin-6 Jack "Digital I/O"
6	Laser Current Monitor "Analog CTL Out" 0 - 10 V	14	Actual Temperature Deviation Output "Deviation Out" -5 to 5 V
7	Serial Number of the Unit	15	TTL Temperature Monitor Output "Temp OK Out" 5 V
8	Cooling Fan	16	TEC Element Output and Temperature Sensor Input "TEC Output"

LD Output

13W3 Mixed D-Sub Jack

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) (+)

TEC Output

17W2 Mixed D-Sub Jack

Pin	Connection	Pin	Connection
1	Interlock, TEC ON LED (+)	10	PT100/1000 (-), AD590/592 (-), LM35 Out, LM135/235/335 (+)
2	Voltage Measurement TEC Element (+)	11	PT100/1000 (+), AD590/592 (+), LM35/135/235/335 (+)
3	Thermistor (-), PT100/1000 (-), Analog Ground	12	Analog Ground, LM35/135/235/335 (-)
4	Thermistor (+), PT100/1000 (+)	13	Not Connected
5	Analog Ground, LM35/135/235/335 (-)	14	I/O 1-wire (Currently Not Used)
6	Digital Ground for I/O 1-wire	15	Ground for 12 V Output and Interlock, TEC ON LED (-)
7	12 V Output (for External Fan, max. current = 500 mA)	S1	TEC Element (+) (Peltier Element)
8	Not Connected	S2	TEC Element (-) (Peltier Element)
9	Voltage Measurement TEC Element (-)	S2	TEC Element (-) (Peltier Element)

Digital I/O Ports

Digital I/O

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 pulse 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

Deviation Out

BNC Female

Actual temperature deviation output, -5 ... +5 V

Temp OK Out

BNC Female

Temperature OK output (high if inside temperature window), TTL 5 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

CAB4000 TEC Element Cable

This cable contains a DB-9 female connector on one side and a 17W2 male connector on the other side. Both views shown below are looking into the connector.

DB-9 Female Connector

17W2 Male Connector

Pin Matching
DB-9 Pin	17W2 Pin(s)
1	1, 15
2	4
3	3
4	2, S1
5	9, S2
6	No Connection
7	10
8	5, 12
9	11
Shield	Shield

DB-9 Connector Colors
Pin	Color
1	White
2	Pink and Gray
3	Red and Blue
4	Pink, Red, and Purple
5	Black, Gray, and Blue
6	No Connection
7	Yellow
8	Brown
9	Green

17W2 Connector Colors
Pin	Color	Pin	Color
1	White	10	Yellow
2	Red	11	Green
3	Red and Blue	12	Brown
4	Pink and Gray	13	No Connection
5	Brown	14	No Connection
6	No Connection	15	White
7	No Connection	S1	Purple and Pink
8	No Connection	S2	Black and Gray
9	Blue	S2	Black and Gray

Sample Screens of the ITC4000 Series

Measurement Screen 1		Measurement Screen 2
	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.		Here the measurement screen is configured to 2 values. The character size is enlarged as much as possible for an easier reading.
Menu Screen		QCW Settings Screen
	The menu screen allows selecting various operation modes and options.		This is the input screen for the Quasi-Continuous Wave (QCW) pulse mode settings, e.g. trigger source and pulse parameters.
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.
Temperature Controller Screen		Temperature Mode Settings Screen
	Via the Temperature Controller Screen all parameters for the temperature controller are entered: Operation Mode, Current Limit, Current Control Mode Settings, Temperature Sensor Settings.		For manual optimizing, the temperature PID control loop settings can be entered here. Temperature setpoint and actual reading are accessible for convenient testing.
PID Auto-Tune Screen		Preferences Screen
	Via this screen the PID auto tune function is started. The ITC4000 automatically selects the optimal PID parameters for the current thermal setup.		The preferences screen offers access to the device preferences, e.g. display and signal settings.

Software for the ITC4000 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.

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)

ITC4001	ITC4005	ITC4020	Part
x			Benchtop Laser Diode/TEC Controller, 1 A / 96 W
	x		Benchtop Laser Diode/TEC Controller, 5 A / 225 W
		x	Benchtop Laser Diode/TEC Controller, 20 A / 225 W
x	x		Cable TED4000/ITC4000 to laser mount, 5 A, 17W2, D-Sub-9 (CAB4000)
		x	Cable TED4000/ITC4000 to laser mount, 20 A, 17W2, 17W2 (CAB4001)
x	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	x	Mixed D-Sub Connector, 17W2, male & female with 2 high current contacts each, 20 A (CON4001)
x	x	x	Mixed D-Sub Connector, 13W3, male & female with 3 high current contacts each, 20 A (CON4005)
x	x	x	USB Cable A-B, 2 m
x	x	x	Instrumentation CD Series 4000
x	x	x	Printed Operation Manual ITC4000 Series
x	x	x	Certificate of Calibration

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Posted Comments:

Poster: tschalk

Posted Date: 2012-10-23 12:10:00.0

A response form Thomas at Thorlabs: Thank you for your inquiry! The ITC4001 has a USB connection which can be used to remotely program any desired temperature sweep. We offer a full SDK to achieve such tasks which is documented in the programmer's reference manual. While a temperature sweep of 1 s is in principle no problem for the ITC4001, the thermal time constant of the complete system (driver + Pelletier+ holder for the laser diode + diode) might prevent this. This will depend on the available power from the ITC4001, the size and efficiency of the Pelletier element and the mechanical properties of the holder for the laser diode. I will contact you directly to discuss the details of your setup in order to see if the sweep time you need could be achieved with the ITC4001.

Poster: oscar.esteban

Posted Date: 2012-10-23 10:31:24.257

Dear Thorlabs team, I'm interested in performing wavelength sweeps thorugh temperature changes. The interest ranges would be about 1 nm with a change rate of about 1s. I know that old modules allowed to do this kind of experiemnts, but I'm not sure how to do with this new one. Is it possible? How? Thank you very much. Óscar

Poster: gurakyu

Posted Date: 2012-07-20 15:55:55.0

hi. I have a question about your equipment, ITC4020 model your company provide. First of all, I want to know if it is possible to control ITC4020 by using USB, and I can get a value of result and temperature control by using Labview program. If possible to get the value, let me know whether you have some program you provide or some sample coded by Labview. Unless you have it, can you let me exactly know how to connect ITC4020 with Labview and code the program. Thanks.

Poster: jvigroux

Posted Date: 2012-07-20 12:28:00.0

A response from Julien at Thorlabs: Thank you for your inquiry. You can control all parameters accessible on the front panel of the device also per USB. We offer a full SDK for the ITC4000 lines. This SDK can be installed with the CD provided with the unit or downloaded from our website under tab software of the ITC4000 product page. The SDK contains all necessary Labview VI's. Those are automatically installed in the instr.lib folder of labview provided a Labview version is already installed. this means that you can access the VI's from the function palette of Labview also. We also provide a Labview example that shows how to communicate with the device. This example can be found after installation of the driver in C:\Program Files\IVI Foundation\VISA\WinNT\TL4000_Drv\Samples\LabVIEW

Poster: sharrell

Posted Date: 2012-07-19 11:50:00.0

A response from Julien at Thorlabs: Thank you for your inquiry! The ITC4001 has an analog input that can be used to control the laser diode current. This input could be for instance connected to the analog output of your DAQ card directly since it accepts voltages. The resolution achievable in terms of current setting for this input is the same as the resolution specified for the unit, namely 16 µA. The small signal 3 dB bandwidth of the ITC4001 is 100 kHz and will probably the main speed limiting factor in your case.

Poster: ta_nis80

Posted Date: 2012-07-18 07:46:02.0

Dear Thorlabs Team Please, I need to confirm some questions about (LASER DIODE AND TEC CONTROLLERS). I plan to design a feedback system to stabilize Laser diode (LD)(CW) with Confocal Fabry Perot Cavity (CFPI)at spectral frequency. I ask about the capability and the method to connect (DAQ-500MHz bandwidth) with (ITC4001)to control the laser diode current to change the spectral frequency. Will I need to voltage current converter and what is the Resolution of driving current? (100 µA ?) – How much is the response time or frequency to control the laser current. With my best regards Tamer

Poster:

Posted Date: 2012-04-04 09:48:39.0

I am interested if two ITC4001 devices can be connected in parallel to achieve higher laser diode current (e.g. 1.5A).

Poster: jvigroux

Posted Date: 2012-04-04 09:09:00.0

A response from Julien at Thorlabs: Thank you for your inquiry! The ITC4001 is a regulated current source, so that the output current is constantly measured and the supplied voltage readjusted based on the last measured current, so that the output current is. Should you use two of those in parallel, the system could become unstable as the interaction between both source currents might lead to one device trying to regulate for the other. I would strongly recommend using a higher current version of this driver line like for instance the ITC4005. Should you need any further information, please do not hesitate to contact us at techsupport@thorlabs.com.

Poster: Thorlabs

Posted Date: 2010-06-28 09:09:27.0

Response from Javier at Thorlabs to hitech_laserservices: the ITC laser diode and temperature controllers feature internal and external modulation from DC up to 100 kHz (50 kHz for the ITC4020). The internal modulation is programmable through the LD Modulation section of the menu. Also, an external modulation input can be connected at the back of the unit through a BNC connector. Now, in order to modulate the output of the laser up to 300 kHz, you can use the Bias-T input of the LM14S2 temperature controlled butterfly laser diode mount. This input allows for modulation from 200 kHz up to 500 MHz (http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=1558&pn=LM14S2). Keep in mind that the maximum current input allowed by the LM14S2 is 5 A.

Poster: hitech_laserservices

Posted Date: 2010-06-26 07:32:20.0

Dear Sir, Please let us know, how could we use these models to drive our fiber laser module in pulsed mode. pulse repetition rate being 30 to 300 kHz. We are developing a ytterbium fiber laser module. With regards Ramesh

Poster: Adam

Posted Date: 2010-03-17 18:14:39.0

A response from Adam at Thorlabs to J.mccord: The LDC40XX and ITC40XX can be used to control LEDs. To answer your question about operating these in pulsed mode, we would need more information. Can you please let us know the repetition rate, pulse width, and cooling requirements. We will email you directly to get all this information.

Poster: j.mccord

Posted Date: 2010-03-16 14:51:58.0

Hi there, can this also be used to drive a high power LED in a pulsed mode? Best regards, Jeffrey McCord

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View All »Matching Part Numbers

Combined Laser Diode and TEC Controllers

Laser Diode Controller Features

TEC Controller Features

Laser Diode Operation Modes

100 µs Pulses of 20 A

Pulsed Operation

Enhanced Protection Features for the Laser Diode

TEC Controller

ITC Front Panel

ITC Back Panel

LD Output

13W3 Mixed D-Sub Jack

TEC Output

17W2 Mixed D-Sub Jack

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

Deviation Out

BNC Female

Temp OK Out

BNC Female

Computer Connection

USB Type B

Ground

CAB4005 Laser Diode Cable

CAB4000 TEC Element Cable

Sample Screens of the ITC4000 Series

Laser Diode Controller Selection Guide