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940nm Laser Diode, 12W Fiber-Coupled Module for Fiber Pumping
- 105µm Multimode Fiber
- Bare-Fiber Termination

  • 940nm 12W Laser Top View
  • 12W Laser Diode from Lumentum

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sku / item#: RLS/L4S-94010-120E
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Key Features
  • 12 Watts of Output Power for Doped Fiber Pumping
  • 940nm Center Wavelength (also available at 915nm)
  • 105 μm Core Fiber, NA = 0.22, Bare-Fiber Termination
  • High-Reliability, Robust, Compact Package

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MODEL RLS/L4S-94010-120E
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Optical Specifications
  • Center Wavelength: 940 nm
  • Optical Output Power: 12 Watts
  • Typical Mean Wavelength at 25 °C: 939 nm
  • Spectral Width (FWHM): 3 nm
  • Conversion Efficiency: 46%
  • Wavelength Tolerance: 928 nm ~ 950 nm
  • Wavelength Tuning vs. Temperature: 0.35 nm/°C
  • Wavelength Tuning vs. Output Power: 1.0 nm/W
Electrical Specifications
  • Typical Operation Current: 13.8 Amps
  • Maximum Operation Current: 15.0 Amps
  • Typical Threshold Current: 0.7 Amps
  • Maximum Operating Voltage: 2.2 Volts
  • Slope Efficiency: 0.92 W/A
Fiber Characteristics
  • Fiber core diameter: 105 μm
  • Fiber numerical aperture 0.22 NA
  • Fiber cladding: 125 μm
  • Fiber buffer: 250 μm
  • Fiber length: 1 meter
  • Fiber Optic Connector: Bare-Fiber
  • Fiber laser pumping
  • Material processing
  • Graphic arts
  • Medical
  • Remote power generation
  • Pyrotechnic ignition

Product Overview:

940nm L4S Laser Diode Module from Lumentum

These 940nm multimode pump laser diode modules from Lumentum are offered in a fiber coupled, high reliability L4S package.

Continuous Design Evolution Delivers A Highly Reliable Device

The L4S-Series fiber-coupled laser diodes are the natural evolution of the highly successful L2 and L3 laser module packages. These devices were designed to be cost effective pumps for the multi-mode pump market. Key applications include fiber laser pumping, materials processing and graphic arts.

Heat Sinking for Lumentum L4 Packaged High Power Pumps
The L4S-94010-120E package was designed to allow the use of either air cooling or water cooled thermal management. To avoid device degradation due to run-away heat build-up, the case temperature should be actively controlled and kept in a safe operating temperature window. A proper heat sink for the diode laser on a thermal radiator will greatly enhance the life of the laser.

Laser Lab Source offers a pre-configured heat sink which has been optimized for the L4 package. It comes pre-drilled with the correct mounting hole placement and has a TEC based cooling plate with a small fan to remove the waste heat. In addition to the mount, the current source and TEC controller unit which is compatible with the 12W laser is also available. Please contact us for more information on controlling and cooling high power Lumentum laser diodes.

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