Multimode Diode Lasers, also known as broad area emitters, have a wider waveguide and emitting area that allows for higher output power. Due to the wider emitter, multi-mode laser diodes have a lower beam quality than single-mode lasers.
The spatial mode structure of a diode laser is determined by the ridge width of the waveguide, similarly as the core of a fiber-optic cable. For high power multimode laser diodes, the ridge widths are typically on the order of 100 microns or larger, which allows for a much larger volume of material to be actively involved in the lasing process and therefore generate higher laser powers. Additionally, this provides a larger surface area at the output facet reducing the intensity and decreasing the risk of catastrophic optical damage. Laser diodes with multiple modes are available from both single emitters and diode arrays and come in either free space or fiber coupled configurations.
Typically, a laser with an M2 value greater than 2 is regarded as ‘multimode.’
Our Multimode Laser Products
Here at RPMC Lasers, we offer a wide range of wavelengths from UV as low as 375 nm to LWIR up to 9.4 µm with multimode outputs, including wavelength stabilized bars and single emitters, QCLs, CW DPSS lasers, Gas Lasers, laser combiners, and more. These lasers are ideal for a diverse range of applications including fiber laser pumping, laser cladding, surface enhanced Raman spectroscopy (SERS), machine vision, and many more.
Deeper Dive into Multimode Lasers
Multimode vs Single-Mode Lasers for Raman Spectroscopy
Raman spectroscopy is one of the fastest growing and most diverse applications in all of laser spectroscopy. As a result, it can be rather challenging at times to sift through the wide-ranging laser options all being marketed for Raman spectroscopy. In this application note we will tackle one of the most common questions that arises when picking a laser for Raman spectroscopy; “Should I chose a single-spatial mode or multi-spatial mode laser for my application?” On the surface, this seems like a simple question since Raman is a nonlinear optical effect and therefore the tighter the beam can be focused the higher the conversion efficiency. Seemingly a single-mode laser would be preferable, but in practice there are other factors that can complicate the situation.
For some application such as laser pointers this elliptical beam shape is perfectly fine and as such only a single optic is necessary for culminating the output. This can be accomplished either by utilizing a cylindrical lens which reduces the divergence of the fast axis while allowing the slow axis to pass through unaffected or by using a single aspherical lens. For more advanced applications which require a circular beam cross cylindrical lenses where each lens is chosen to match the numerical aperture of the fast and slow axis can be used as shown in the figure below. While this approach does an excellent job of circularization it often results in a diamond-shaped beam profile due to amplified spontaneous emission, to further improve the beam quality, it is generally preferable to fiber couple the beam and then re-collimate the output. For single mode lasers the fiber acts as a spatial filter resulting in a perfect TEM00 output beam, and in the case of multi-mode lasers, the fiber acts as a homogenizer significantly reducing the hot spots and dark spots. All of the optical configurations discussed previously are used with single emitters, but the same principles can also be applied to multi-emitters where large cylindrical lenses or microlens arrays are often utilized.
In the previous blog post on this subject, we discussed that when machine vision is used for the inspection of small parts, laser lines and other shapes are typically achieved through the use of diffractive optical elements, which when used with single mode diode lasers can create a wide variety of geometric shapes and patterns. While these low power single mode lasers are typically sufficient for inspection of small parts on a production line, as the size requirements on the line continue to increase the use of multimode high-power lasers becomes a necessity. As a result, the higher power density becomes an issue for diffractive optics to handle as they are unable to shape multi-spatial mode lasers. As a result, to generate long lines from higher powered multi-mode laser diodes either galvanometric scanning mirrors or micro-optic arrays are required. While scanning mirrors can be somewhat effective at producing uniform laser lines, they suffer from reliability issues, especially in rugged environments, making them a less than ideal solution for deployable field systems. Micro-lens arrays, on the contrary, are a monolithic solution which can either be placed at the output of a fiber-optic cable or directly in front of the diode bar to exploit inherent astigmatism and produce flat top laser lines. In the previous blog, we showed the example of one such flat top laser source, the FocusFlux from Focuslight. It can create a high-power laser line at distances up to 3 meters from the source with fan angles as large as 110-degrees, making them ideal for inspecting larger objects and surfaces.
With over 25 years experience providing multimode lasers to researchers and OEM integrators working in various markets and applications, and 1000s of units fielded, we have the experience to ensure you get the right product for the application. Working with RPMC ensures you are getting trusted advice from our knowledgeable and technical staff on a wide range of laser products. RPMC and our manufacturers are willing and able to provide custom solutions for your unique application.
If you have any questions, or if you would like some assistance please Contact Us here. Furthermore, you can email us at info@rpmclasers.comto talk to a knowledgeable Product Manager.
Alternatively, use the filters on this page to assist in narrowing down the selection of multimode lasers for sale. Finally, head to our Knowledge Center with our Lasers 101 page and Blogs, Whitepapers, and FAQ pages for further, in-depth reading.
Finally, check out our Limited Supply – In Stock – Buy Now page: This page contains an ever-changing assortment of various types of new lasers at marked-down/discount prices.
The Matchbox series offers excellent performance and reliability in the “World’s Smallest” ultra-compact, all-in-one, integrated laser head. They can operate on a 5V power supply while maintaining low noise operation. The monolithic design of the Matchbox Series laser includes thermally stabilized optics in a hermetically sealed housing, ensuring reliable and maintenance-free operation. This series is available in wavelengths from 405 nm thru 1064nm, with options for collimated beam or fiber-coupled output, and single-mode and multimode versions.
The HL Series offers versatile and high-quality laser diode products in a variety of wavelengths and high-power options,ideal for direct imaging, industrial, and bio/medical applications. These reliable, efficient, and compact diodes come in TO-Can packages, making them perfect for OEM integration. Additionally, they operate with TE mode oscillation and are RoHS compliant, ensuring safe use. Choose the HL Series for quality, reliability, and performance in laser diodes.
The JDL series offers industry-leading custom high-power unmounted laser diode bars in the 760-1070 nm spectral region. Our unmounted laser diode bars are available in a wide range of emitter configurations, cavity lengths, and CW or QCW operational modes. We offer low fill factor bars suitable for fiber coupling, high-power bars up to 300W for CW or hard-pulse industrial DDL applications, and QCW bars up to 500W for QCW or long-pulse optical pumping and medical applications. With full customization options including custom designed epitaxial wafer structures, you’re sure to get the perfect solution for your needs.
The JenLas D2 series showcases innovation in high-power disk laser technology, featuring our trusted 532 nm laser sources with up to 8W CW output. With over 25k units installed, our CW-532 nm thin disk lasers are reliable in fields like ophthalmology, dermatology, and quality control. Our lasers operate on TEC-controlled laser diode pump sources, Nd:YVO4 gain crystals, and TEC-controlled internal frequency doubling LBO crystals. Offering the highest electro-optical efficiency, water-less cooling, and high beam quality, our lasers outperform other solid-state technologies. The series offers multiple integration levels, including the compact OEM JenLas D2.mini 2-8W that fits in the palm of your hand and the fully integrated JenLas MLS Green system for medical applications. The JenLas D2 series is ideal for customers seeking reliable, high-performance laser technology with consistent output power and easy integration.
The JOLD-FC series of high-power fiber-coupled laser diode arrays (bars) provide a cost-effective and robust solution for OEM applications. With superior reliability and efficiency, our lasers offer industry-leading performance. We offer standard wavelengths of 760-1070 and 1470 nm, with 200, 400, or 600 µm fiber core diameters. Other optional components include pilot lasers, monitor diodes, and integrated Peltier elements, available in the JOLD-FC series, ensuring you get exactly what you need.
The JOLD-Open Heatsinks Series offers industry-leading, reliable, and cost-effective high-power free-space single-laser-bar packages based on passively or actively cooled heat sinks in the 760-1070 nm range. Our proprietary heat sink and assembly technology, paired with our focus on advanced optical pumping and direct-diode-laser technology, results in diode lasers with unmatched performance including optical output power, electro-optical (EO) efficiency, and lifetime. This series offers options from 792 nm up to 1035 nm, and average output powers up to 300 W CW with passive cooling.
The JOLD–Stacks Series offers a highly modular approach for power scaling well into the kW range. The series features compact, lightweight, and robust multimode, free-space laser diode stacks with options for 760-1070 nm, CW & QCW operation, output power up to 2400 W (QCW), no lensing or FAC or FAC/SAC collimation, active or passive cooling, and are completely customizable. JOLD-Stacks achieve optimal beam quality by reducing the stack pitch without compromising cooling capacity, and our proven hard-solder technology and strictly monitored production processes ensure tried & tested reliability in the harshest environments.
The LaserBoxx HPE Series is a highly versatile and customizable laser diode module series that offers superior performance and reliability in a compact, driver-integrated laser head. With a wide range of wavelengths from the UV to the NIR, this series provides high-power output, removable MM fiber coupling options & dedicated control software with USB and RS232 interfaces, as well as an external controller with power display, ensuring easy integration and precise power and modulation control.
The LDX Series of made-in-the-US, high-power, multimode laser diodes provide wavelengths from 400nm – 1900nm, a wide range of output powers and package types, as well as completely customized solutions. We have been offering these high-quality laser diodes for over 25 years. The performance, reliability, and lifetimes are time tested, and if for some reason there is an issue, we will make it right.
The LGK series of HeNe laser modules boast an excellent TEM00 beam, robust mechanical design, a long service life of up to 30,000 hours, and are available in 543, 594, and 632.8nm wavelengths, with output powers up to 20mW. Choose between standard and customized models, with options for single or multimode, random or linear polarization, Brewster window tubes, and fiber coupling. Designed for long life, low noise, and high stability, with many customization options, these HeNe lasers are perfect for spectroscopy, interferometry, holography, and more!
The LGR series of HeNe laser replacement tubes provide unparalleled performance for a wide range of applications, have a robust mechanical design, excellent beam quality, and a long service life of up to 30,000 hours. Standard and customized models are available at 632.8nm with output powers up to 10 mW and options for side line suppression, polarization switching elimination, two longitudinal modes, magnetic field stability up to 3 G, and split frequency versions. These advanced options provide versatility for a range of sophisticated and high-precision scientific applications.
The LXCc series is a range of compact, highly customizable, and flexible all-in-one laser combiners that provide the widest variety of wavelength options, up to 7 different laser lines (up to 500 mW output power per line), direct modulation on every source, SLM capabilities, proven long-term stability, and many other advanced features. The turnkey or OEM versions allow a large choice of lasers from 375nm up to 1064nm. The extension module provides the ultimate level of flexibility with options for up to 4 optical fiber outputs, AOTF modulator, motorized ND filter, integrated fast switching output ports for FRAP, or adjustable split power for light-sheet microscopy.
The PowerMir series is a line of high-power, pulsed Quantum Cascade Lasers based on proprietary technology, available in wavelengths from 4-9 µm and either turnkey benchtop systems, OEM driver + laser module, HHL package, or chip. Our lasers operate in Quasi-Continuous Wave (QCW) mode, enhancing wall-plug efficiency and thermal dissipation. The PowerMir series is ITAR-free, featuring high-powered diodes that emit in the primary atmospheric transmission bands. Our lasers produce a circular TEM00 Gaussian beam for superior performance.
The R series of wavelength-stabilized single-mode and multimode laser diodes offer narrow linewidth output in wavelengths from 633nm thru 1064nm, with output powers up to 5 W. This highly customizable series offers package options ranging from components as basic as a TO-56 or 14-pin BF packaged diodes to OEM modules, including electronics, to UL/CE and IEC-certified turn-key systems. The R series is the perfect source for various markets, including chemical analysis, bio-medical, fiber laser, and scientific applications.
The RPK Series of multiple, single-emitter fiber-coupled diode lasers are available in wavelengths from 405nm thru 1550nm with up to ≈ 500W output power. Our specialized fiber-coupling techniques ensure high efficiency, stability, and superior beam quality, while rigorous inspections and burn-in procedures guarantee each product’s reliability, stability, and long lifetime. Highly customizable packages allow us to meet our customers’ specific needs, providing high-quality products at reasonable prices.
The RPKBDL Series is a high-power direct diode turn-key system available in wavelengths of 445nm, 915nm, or 976nm, providing up to 3kW of power and unprecedented brightness. Its pluggable design makes maintenance easy, avoiding troubles and high time costs caused by return-to-factory maintenance. The RPKBDL series results from continuous innovation, ensuring high technical strength and product quality. This highly customizable system allows us to meet our customers’ specific needs, providing high-quality products at reasonable prices.
The RWLD series offers competitively priced laser diodes with high beam quality and a wide variety of products to support multiple applications. Available in a wide range of wavelengths, power levels, and packages. The RWLD wavelength options span from 405nm to 1650nm, with output powers in the range of 10 mW to 300 mW, packaged in a TO-18 package with photodiode. We also offer customized options, such as a customized wavelength, output power, or a special package to meet your specific needs.
The RWLP series offers an affordable and versatile solution for your laser application needs with single-mode and multimode options and wavelengths from 405nm thru the IR region. With customizable options, our team can work with you to solve any challenges you may face. Rigorously tested for long-term reliability, the RWLP series ensures consistent performance and high beam quality. Perfect for integration, this series supports multiple applications including biological and analytical instrumentation.
The SMX Series of US-made, high-power, thermally stable, and cost-effective InP laser diodes is available at 13XX, 14XX, 15XX, 16XX, and 19XX nm, perfect for medical, military, aerospace, LIDAR, free-space communications, and more! With a patented EPI structure, low-cost packaging, DFB & SOA configurations, ISO certified supply chain with full lifecycle traceability, focus on ease of integration, and custom design capabilities, this laser diode family is an excellent choice for reliable, high-power InP devices.
The RWLS series of RGB White Laser Diodes offers customizable, versatile, and reliable solution for your laser applications. Available in a wide range of power levels, with three base wavelengths: 635 nm (Red), 520nm (Green), and 445nm (Blue), the RWLS series can be tailored to your exact specifications. Typically packaged in a pigtailed HHL configuration, with built-in TEC, there are also plenty of customization options including wavelength, power, and packaging.
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The RPKBDL Series is a high-power direct diode turn-key system available in wavelengths of 445nm, 915nm, or 976nm, providing up to 3kW of power and unprecedented brightness. Its pluggable design makes maintenance easy, avoiding troubles and high time costs caused by return-to-factory maintenance. The RPKBDL series results from continuous innovation, ensuring high technical strength and product quality. This highly customizable system allows us to meet our customers’ specific needs, providing high-quality products at reasonable prices.
The SMX Series of US-made, high-power, thermally stable, and cost-effective InP laser diodes is available at 13XX, 14XX, 15XX, 16XX, and 19XX nm, perfect for medical, military, aerospace, LIDAR, free-space communications, and more! With a patented EPI structure, low-cost packaging, DFB & SOA configurations, ISO certified supply chain with full lifecycle traceability, focus on ease of integration, and custom design capabilities, this laser diode family is an excellent choice for reliable, high-power InP devices.