UV Laser Diode


UV Laser Diode: 375 nm Center Wavelength

  • Output Power up to 20 mW
  • Ø5.6 mm Diode with SM05-Threaded Housing
  • Shipped from Stock


  • Output Power up to 20 mW
  • 375 nm Center Wavelength
  • TO Packaged with SM05-Threaded Housing
  • Easily Choose a Compatible Mount Using Our LD Pin Codes
  • Compatible with Thorlabs' Laser Diode and TEC Controllers
  • For Convenience, Thorlabs Retains the LD Manufacturer's Item Numbers

This web page contains Thorlabs' UV laser diode with a center wavelength at 375 nm. The table below lists basic specifications to help you narrow down your search quickly. The blue Info button next to the part number within the table opens a pop-up window, which contains in-depth information regarding the diode.

This 375 nm diode is available pre-mounted in the S05LM9 laser diode mount. We have categorized the pin configuration of TO-packaged diodes in to standard A, B, C, D, E, F, G and H pin codes (see image below). This pin code allows the user to easily determine compatible mounts. TO-packed diodes are the most widely supported diodes by our product line.

While the center wavelength is listed for the diode, this is only a typical number. The center wavelength of a particular diode varies from production run to production run, thus the diode you receive may not operate at the typical center wavelength. Diodes can be temperature tuned, which will alter the lasing wavelength.

Laser diodes are sensitive to electrostatic shock. Please take the proper precautions when handling the device; see electrostatic shock accessories. Fabry-Perot lasers are also sensitive to optical feedback, which can cause significant fluctuations in the output power of the laser diode depending on the application. 


These laser diodes are designated for use solely as components and are not sold as a complete laser product.  The purchaser assumes the responsibility to comply with US 21 CFR 1040.10, US 21 CFR 1040.11, and IEC 60825-1, Edition 1.2 with regard to the use of these diodes and their introduction into commerce. 
Laser Diode Warranty

When operated within their specifications, laser diodes have extremely long lifetimes. However, most failures occur from mishandling or operating the lasers beyond their maximum ratings. Laser Diodes are highly static sensitive devices. Since Thorlabs does not receive any warranty credit from our laser manufacturers we cannot guarantee the lasers after their sealed package has been opened. Thorlabs will be happy to extend a full refund or credit for any lasers returned in their original sealed package within 30 days of purchase.

Please refer to the LD Operation tab for details on our warranty policies.

Thorlabs, Inc. Life Support and Military Use Application Policy

Thorlabs' products are NOT authorized for use as critical components in life support devices/systems or in any military applications without the express written approval of the president of Thorlabs.

  1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.
  2. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness.
  3. The Thorlabs products described in this document are not intended nor warranted for usage in Military Applications.


375 nm

Item # Wavelength
Drive Current
PackagePin CodeCompatible
Spatial Mode
L375P020MLD   375 20 60 mA / 85 mA Ø5.6 mm B S7060R No Single Mode


*S05LM9 mount included with laser diode



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