Laser Diode Modules
Definition: modules containing diode lasers, and possibly also some optics, cooling devices, electrical elements, etc.
German: Laserdiodenmodule
Categories: photonic devices, lasers
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Author: Dr. Rüdiger Paschotta
Laser diodes are often used in the form of laser diode modules, i.e. packages which contain one or several laser diodes, in most cases combined with some optics and electronics. Such modules are much easier to use than plain laser diodes, as they serve a number of functions:
- Beam shaping: some optics (e.g. consisting of collimating lenses, microoptics, and anamorphic prism pairs) can be used to shape the output beam, e.g. in order to obtain an approximately circular beam with small divergence. Such a collimated beam can be more easily transmitted over some distance and more efficiently coupled to an optical fiber. Other modules for specialized applications offer certain beam shapes, e.g. that of a line, a cross, an open circle, or a square.
- Fiber coupling: some laser diode modules are fiber-coupled, i.e., directly launch the generated light into an optical fiber (“pig-tailed” laser diodes).
- Electrical connections: a laser diode module may contain not only simple connections to the pins of the laser diode, but also additional electronic circuit elements, e.g. for protecting the laser diode against electrostatic discharge (ESD protection), wrong poling and too high operating voltages. It can often be operated directly with a battery or with an unstabilized power supply.
- Cooling arrangements: for high powers, a laser diode module can facilitate the cooling, e.g. by offering a metallic surface which can easily be mounted on a cooler. A thermoelectric cooler (TEC) may also be included, often with a feedback system to stabilize the diode temperature. This leads to a more stable output wavelength and power.
- Power stabilization: the output power may be stabilized with an internal feedback loop with a monitor photodiode (often built into the actual laser diode).
- Pulse generation: the drive current may be pulsed in order to generate output pulses via gain switching. It is possible to obtain nanosecond or even picosecond pulses in that way.
- Wavelength conversion: there are green laser diode modules with an internal frequency doubler. Such a module may contain an amplified single-mode laser diode and a nonlinear waveguide, for example.
Applications of laser diode modules include precise pointing and alignment of optical elements, printing and imaging systems, displays, bar code scanning, optical data storage, optical sensors, pumping of solid-state lasers, open air communication, and medical applications (e.g. photodynamic therapy, ophthalmology).
There are also laser pointers, which can be considered as laser diode modules with integrated batteries, normally used as hand-held devices.
Suppliers
The RP Photonics Buyer's Guide contains 89 suppliers for laser diode modules. Among them:
RPMC Lasers
RPMC Lasers offers one of the widest wavelength selections of laser diode modules available ranging from the UV through the IR. Our multimode and single mode diode laser modules are available in both fiber-coupled and free space configurations in both OEM and turnkey packages.
Schäfter + Kirchhoff
Schäfter+Kirchhoff offer various laser line generators, laser focus generators or laser diode collimators. You can select them easily using our product configurator.
Aerodiode
AeroDiode offers a range of fiber-coupled laser diode modules emitting around 808 nm, 915 nm, 980 nm, 1064 nm or 1550 nm. Output powers are up to 150 W multimode (free space or fiber-coupled), other models are single-mode emitters for continuous-wave or nanosecond pulsed operation.
Lumibird
Lumibird manufactures a wide range of laser diodes and laser diode modules. Our offering includes QCW diode stacks, CW laser diode modules, fiber coupled QCW diode stacks, short pulse laser diode illuminators, as well as high brightness diode source, IALDA, and pulsed power supply drivers for QCW diodes.
Frankfurt Laser Company
Laser diode modules from Frankfurt Laser Company are easy to use plug-and-play laser systems suitable for a wide range of military, industrial and medical applications.
Suited for pointing and target designation, spectroscopy, measurement equipment, laser display, printing, biomedical, patient positioning, material processing, laser show, alignment and positioning of materials including garments, cloth, paper, wood, stone and metal.
Edmund Optics
Edmund Optics offers a wide range of diode laser modules, containing diode lasers or diode-pumped solid-state lasers.
TOPTICA Photonics
TOPTICA offers various tunable diode laser modules. The combined spectral coverage is from 190 nm to 3500 nm, powers up to 4 W (TA), mode-hop-free tuning up to 110 nm (CTL).
TOPICA’s high-performance diode lasers are the ultimate choice when looking for a high-performance, ultra-reliable OEM diode laser system.
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See also: laser diodes, laser pointers, fiber-coupled diode lasers
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