Red lasers typically emit light at around 650 nanometers. This wavelength corresponds to a specific range of energy levels in the laser medium, which can be achieved through various techniques such as gas discharge, solid-state or diode pumping.
The output power of red lasers can vary depending on the specific application, but they are generally low power devices. Red lasers can be designed as continuous-wave or pulsed output and can be further modulated for specific use cases. They also often have a narrow spectral linewidth, which is useful for spectroscopy and other precision measurements.
Red laser diodes, which are typically fabricated out of GaInP or AlGaInP, are the most popular and well-developed laser diodes available on the market today. Red diode lasers are instrumental in a wide variety of applications ranging from inexpensive laser pointers to laboratory flow cytometry systems. 632.8 nm red light is the standard for helium-neon (HeNe) lasers, though they can produce green, yellow, and other wavelengths. HeNe lasers have been around for many years and are a tried-and-true staple in laboratories everywhere. Red HeNe lasers are often used for interferometry and laser alignment, for example. Wavelength shifted DPSS lasers can produce red wavelengths through the process of harmonic generation (frequency doubling in this case). Red wavelengths can also be generated through the use of optical parametric oscillator (OPO) technology.
Some of the most common red wavelengths are 635 nm, 650 nm, and 670 nm. On the shorter end of the red spectral region, the wavelengths are more visible to the human eye, but they aren’t as easy to efficiently generate.
Our Red Laser Products
RPMC is one of the largest red diode laser suppliers in North America. See our wide range of Red Lasers for sale! We offer the widest range of wavelengths, powers, and package types for red laser diodes, and we offer a wide range of other red laser products. People often picture red laser pointers when they think of red lasers. However, there are many types of red lasers on the market. We do not offer laser pointers, but we do have red laser line modules (laser line generators) and many other types of lasers generating red wavelengths.
We offer many different red wavelength laser types:
Red Single Emitter Laser Diodes
Red Multi-Emitter Laser Diodes
Red VBG Laser Diodes
Multiple Wavelength Lasers
Red Laser Diode Modules
Red Laser Line Modules
Red HeNe Gas Lasers
Red Pulsed DPSS Lasers
Red CW DPSS Lasers
Tunable DPSS Lasers
Our Red Laser products are available in a range of output powers up to 25 W average power, options for single-mode or multimode, free-space, fiber-coupled or line generation output, and various packaging options and integration levels from component to OEM to turnkey systems.
A comprehensive review of the biophysics behind PDT is beyond the scope of this blog post, but it is valuable to look at the importance of excitation wavelength for dermal and subdermal PDT by taking a brief look at the absorption and scattering properties of tissue. While intuitively it may seem evident that shorter wavelength lasers would serve as a better excitation source for the photosensitizer, due to the higher photon energy, but the shorter the wavelength of the photon the less depth penetration they have because absorption and scattering cross-sections are inversely proportional to wavelength.
One study on the topic in which a detailed computer model was developed to describe how human skin reacted to various wavelengths presented in 2011 by Mustafa, Et al. from the Universiti Sains Malaysia, School of Medical Physics. In the presentation they demonstrated a realistic skin model where they simulated the absorption and depth penetration laser wavelengths ranging from 308 nm to 635 nm, showing that red light was absorbed at approximately 1/7th the rate of ultraviolet light allowing for up to 5 times deeper depth pentation. On the other end, once you move above the red and into the near infrared region of the spectrum not only does the photon energy further drop but, as shown in the figure below, both the lipid and water absorption starts to increase. As a result most commercially available photosensitizers are engineered to have absorption peaks in the 630 nm to 750 nm range. For example, HpD (Photofrin®) activates at 630 nm, PpIX (ALA) at 635 nm, mTHPC (Foscan ®) at 652 nm, BPD-MA (Verteporfin) at 690 nm, and Lu-tex (LUTRIN ®) at 732nm.
High Power CW Lasers for Holography, Interferometry, Spectroscopy
Laser applications are becoming increasingly sophisticated as demand rises for more precise measurements, faster throughput, and better analysis. Some applications like Holography, Interferometry, and Raman Spectroscopy are rapidly growing in popularity along with the demand for better results. Because of this increased demand, companies are developing more advanced lasers with higher beam quality and other features meant to enhance the results of these popular applications. In this article, we will discuss Holography, Interferometry, and Raman Spectroscopy, and some of the important laser characteristics and features required to ensure these applications are successful and provide exceptional results.
Wavelength – The final consideration when looking at lasers for holography is the wavelength needed for the best results. Security labels would be ineffective if they were recorded in the IR region, outside the range of the human vision. Many modern holographic images are created using multiple wavelengths – red, green, and blue – in order to produce a colored final image. Holographic applications that do not rely on the human visual range can utilize wavelengths outside the visible range. Data storage, for instance, would indeed benefit from shorter UV wavelengths, leading to higher information density.
Laser Alignment: HeNe Lasers, Methods, and Helpful Tips
A helium-neon (HeNe) laser is a continuously operating or continuous-wave (CW) gas laser. The gain medium is a 10:1 mixture of helium and neon, pressurized within a glass tube. When applying a direct current (DC) to two electrodes on opposite ends of the tube, helium atoms are excited into metastable states. When excited, helium atoms can efficiently transfer energy to neon atoms with quite similar excitation energies. Due to the multiple energy levels of neon atoms, numerous laser transitions are possible with this type of gas laser. The most common transition used today is 632.8nm (red). However, 543.5nm (green), 594nm (yellow), 612nm (orange), and 3.39µm (MWIR region) are also possible by utilizing resonator mirrors with coatings with peak reflectance at these specific wavelengths. If you’re interested in reading a bit more about the history and development of the HeNe laser, check out our recent article titled “HeNe Lasers: Bright Past, Brighter Future.”
Visible Laser Light for Alignment
Are you wondering how to align an infrared beam? Aligning an infrared wavelength laser can be tedious and frustrating since you’re dealing with an invisible beam. Therefore, the use of visible laser wavelengths in the red or green regimes proves to be quite helpful for actively visualizing your optical path during the alignment process. In the case of red wavelengths, the human eye’s sensitivity starts to drop quickly as the wavelength increases toward the infrared. So, choosing a shorter red wavelength (e.g., 630nm vs. 690nm) provides a much higher level of visibility, especially with high levels of ambient light. Some optical components may cause alignment issues when using specific wavelengths due to various wavelength-dependent dielectric coatings on optical lenses and other chromatic aberrations. Typically, these issues are only seen in optical lenses and not on reflecting mirrors. So, if your system involves optical lenses, be sure to note any conflicts with your lens coatings or substrate composition and the visible wavelengths you might use to align the optical system.
Typically, visible-wavelength lasers are used for machine vision systems, as cameras and detectors are readily available, and the beams are easier to align. Some circumstances can dictate the use of infrared or even ultraviolet lasers. The most common visible wavelengths include blue, green, and red. Wavelengths are expressed in units of nanometers (nm). Some of the most common colors and their wavelength ranges are blue (405-450 nm), green (532-550 nm), red (635-680 nm), as shown in Figure 2. In the near infrared portion of the spectrum, typical wavelengths that are used are: 830, 980, 1060, and 1550nm, but you can get many wavelengths in between. Try to understand if wavelength matters for your application, as some wavelengths are less expensive and others are available in higher power. If you need a green laser, but the exact wavelength doesn’t matter, let your vendor know you have a wide tolerance. An example of how you might spec this is: 540 ± 10 nm.
Lasers have other optical properties that are related to wavelength that may or may not be important to machine vision applications, but affect the price and quality of the beam. One is spatial mode quality. Lasers can produce a single spatial mode that produces a nicely uniform gaussian-shaped intensity profile. Some lasers achieve higher power by operating in more than one spatial mode, which is called multi-mode operation. A multi-mode beam profile or spot can look non-uniform and may fluctuate in intensity with time as shown in Figure 3. It is important to define if beam quality is important to your application, as is the case for most machine vision systems. If so, then you should specify a single mode laser.
HeNe Lasers vs. Diode Lasers: HeNe Laser Pros and Cons
Historically, Helium-Neon (HeNe) lasers were often the first choice for precision instrumentation, measurement setups and some spectroscopy applications. It was invented in 1960 and technologically it was one of the first lasers with extraordinary good parameters. The mechanical and optical design is quite simple (apart from sophisticated glasswork to make the tube itself) but the gas lasing medium and overall construction provide some intrinsic advantages. But also a number of disadvantages.
Advantages of HeNe Lasers
High Coherence Length
This is very typical to most gas lasers. In case of HeNe, the coherence length varies from 20 cm (for multiple longitudinal modes) to more than 100 m. It all depends on cavity parameters and mirrors and etalons used in the design.
Stable Central Wavelength
The typical emission wavelength of HeNe lasers is about 632.816 nm in air. Very stable oscillation frequency of <1 MHz (<0.001 pm @633 nm) drift is characteristic just to the most sophisticated HeNe lasers, having extra stabilization measures. The central wavelength of non-stabilized lasers can drift in the range of 1 pm, which is still fairly good, comparing to other laser types….
With over 25 years experience providing Red 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 [email protected]to talk to a knowledgeable Product Manager.
Alternatively, use the filters on this page to assist in narrowing down the selection of Red 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.
Check out our Online Store: This page contains In-Stock products and 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 LaserBoxx Low Noise series of CW diode laser modules & DPSS lasers offer wavelengths from 375 to 785nm, output powers up to 500 mW, and OEM & plug-&-play modules. These rugged, compact & highly customizable lasers also offer excellent beam quality & stability, modulation capabilities, ultra-low noise output & options for SM, MM, and PM fiber coupling. Our dedicated control software, USB and RS232 interfaces, and external controller with power display make integration, operation, and remote diagnostics a breeze.
The LaserBoxx-SLM series of SLM CW DPSS & diode laser modules are available in wavelengths from 532-1064 nm, delivering ultra-narrow line widths with excellent temperature stability and low noise current. Embedded firmware locks the laser on the same mode at each startup. This customizable, compact laser module is available in turn-key or OEM versions, with GUI for remote operation & diagnostics via USB, RS232, or direct I/O interface, with modulation capabilities and adjustable power options.
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 modulesboast an excellent TEM00 beam, robust mechanical design, a long service life of up to 30,000 hours, and are available in 543nm, 594nm, 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 applications including spectroscopy, interferometry, holography, medical, and more!
The LGR series of HeNe laser replacement tubesprovide unparalleled performance for a wide range of applications.have a robust mechanical design,excellentbeam quality, and a long service lifeof up to 30,000 hours. Standardand customized models are available in a large variety in the red, green, and yellow spectral ranges withoutput powers up to 20 mW. Options for single–modeormultimode, random or linear polarization, and Brewster windowtubes for educational and scientific purposes.
The Q-TUNE-G series is a highly advanced air-cooled, tunable wavelength laser with seamless OPO integration. It offers hands-free, automated tuning from 680 to 2100 nm, delivering up to 12 mJ pulse energy in the near-IR range. With a <10 cm-¹ linewidth and up to 100 Hz pulse repetition rate, it’s ideal for photoacoustic imaging, non-linear spectroscopy, and more. The user-friendly web interface and microprocessor control ensure ease of use, while the water-free, air-cooled pump laser design optimizes performance. The Q-TUNE-G series sets a new standard in precision and efficiency for researchers across disciplines.
The Q-TUNE series is a highly efficient, tunable wavelength laser designed for researchers working with temporally resolved spectroscopy, metrology, photo-acoustic imaging, and remote sensing applications. This laser uses an optical parametric oscillator (OPO) to produce a tunable wavelength range of 410-2300 nm with a linewidth narrower than 6 cm-1, which can be extended to 210-410 nm with an optional second harmonic generator. With a pulse duration shorter than 5ns and an upper repetition rate of 100Hz, the Q-TUNE series provides a perfect coherent light source for precise scientific measurements.
The Q-SHIFT series of Q-switched DPSS lasers is designed for researchers and application specialists working in micromachining, dermatology, LIDAR, time-resolved laser spectroscopy, and LIBS applications. With its built-in nonlinear wavelength conversion stage, this series allows the production of unconventional fundamental DPSS wavelengths, including 1163, 1177, 1300, 1317, 1551 and 1571 nm options, making it an ideal choice for those seeking wavelengths that are not accessible with conventional solid-state laser sources. With the optional harmonics generator, it is possible to generate up to the 4th harmonic for each fundamental wavelength, providing even more versatility.
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 RHAML series of diode laser modules deliver a uniform, stable output beam that crucual for machine vision applcations, especially in 3D vision systems. The compact, RHAML series is a reliable light source that incoroporates a fucusing lens that can be easily adjusted by the user. Additionally, the RHAML series is fully IP67 compliant, making it an ideal solution for use in harsh environmental conditions and production/industrial facilities.
The RML series of laser diode modules are available with single mode fiber outputs with a set wavelength from 405nm – 2500nm. The compact RML series is available with up to 80mW of output power in a package measuring 15mm in diameter and 40mm in length (without connector) . As an option these modules are offered with a potentiometer for power adjustment, external TTL modulation up to 1MHz and analog modulation up to 100kHz.
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 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 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.