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Precision Constant Current Laser Drivers
Mounted on an LD1255P
The LD1255R (250 mA) is a low-noise, highly-stable, constant-current laser diode driver. The LD3000R is a higher-power (2.5 A) version of the LD1255R. These laser drivers are also recommended for driving LEDs. Both laser current drivers fully support the A, D, and E pin configurations (shown below).
Note: The photodiode monitor circuits of the LD1255R and LD3000R only support lasers that have an isolated photodiode anode (i.e. the photodiode cathode connected to the laser anode). They will not work with common cathode lasers. CONNECTING THE PHOTODIODE OF THESE LASERS TO THE LD1255R or LD3000R WILL DESTROY THE LASER. The LD1255R and LD3000R will operate the laser portion of all common cathode lasers without any problems as long as the photodiode anode is not connected to the driver.
LD1255R Top View
LD3000R Top View
LD1255R Pin Designations
LD3000R Pin Designations
IMPORTANT! Do not operate the LD3000R without a jumper installed on J2. Your laser may be overdriven and permanently damaged.
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Thorlabs' Smart Pack Initiative is aimed at waste minimization while still maintaining adequate protection for our products. By eliminating any unnecessary packaging, implementing packaging design changes, and utilizing eco-friendly packaging materials for our customers when possible, this initiative seeks to improve the environmental impact of our product packaging. Products listed above are now shipped in re-engineered packaging that minimizes the weight and the use of non-recyclable materials.b As we move through our product line, we will indicate re-engineered packages with our Smart Pack logo.
Laser Diode Controller Selection Guide
The tables below are designed to give a quick overview of the key specifications for our laser diode controllers and dual diode/temperature controllers. For more details and specifications, or to order a specific item, click on the appropriate item number below.
The LD1255R is a low-noise, ultra-stable, constant-current laser diode driver. It supplies up to 250 mA of drive current, supports laser pin configurations A, D, and E, and is ideally suited for demanding diode laser applications such as operating a laser diode in an external cavity tunable laser. This second-generation laser diode driver includes on-board Zener and Schottky diode protection as well as a disable pin. The op-amp and voltage reference design enables more precise laser current control. The LD1255P Mounting Plate, which features 8-32 and M4 taps for post mounting, allows the LD1255R to be secured to a breadboard or optical table. A power supply and cable compatible with the LD1255R laser diode driver are also offered separately below.
The LD3000R driver is a higher-power version of Thorlabs' popular LD1255R ultra-stable, low-noise laser diode driver featured above. It utilizes high-current components, supplies 2.5 A, and supports pin configurations A, D, and E. The aluminum housing allows additional heat sinking, which results in a highly stable laser diode driver in a relatively small package. This device can operate both LEDs and laser diodes.
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Pin Diagram for the Included Cable
The LD1255-SUPPLY Bundle includes the LDS12B Power Supply and the appropriate cable to connect to the LD1255R Laser Diode Driver (available above). A switch on the power supply box enables the user to choose a 100 V, 120 V, or 230 V input voltage. The cable is able to transmit ±12 VDC from the power supply to the LD1255R laser diode driver; it is not compatible with the LD3000R Laser Diode Driver. The included cable can be ordered separately from the power supply by contacting Tech Support.