Long Coherence Length Lasers:

High-Coherence Lasers for Precision Application in Sensing, Spectroscopy & More

          • Precision-Controlled Single-Mode Lasers for Advanced Applications
          • Advanced Wavelength Stabilization Technologies for Superior Stability
          • Versatile Solutions for Applications Across Multiple Fields

We’re experts at helping select the right configuration for you!

The Long Coherence Length Lasers We Offer:

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Precision-Controlled Single-Mode Lasers for Advanced Applications 
    • Designed for applications requiring stable phase and minimal signal distortion
    • Coherence lengths extending beyond 1m for critical measurements and holography
    • Ideal for precision tasks like interferometry and telecommunications where stability is key

simple line graphic illustrating the choice between multiple wavelengths - a finger pointing to one of three colored lambda symbols

Advanced Wavelength Stabilization Technologies for Superior Stability
    • Violet, Blue, Green, Yellow, Red & NIR wavelength options w/ high coherence output
    • Narrow linewidth/SLM DFB & VBG diode lasers & HeNe lasers
    • Temperature and current stabilized DPSS configurations for consistent performance

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Versatile Solutions for Applications Across Multiple Fields
    • Tailored options to meet your specific wavelength & power needs
    • Ideal for holography, interferometry & precision metrology w/ beam splitting needs
    • Demanding analytical applications: DNA sequencing, flow cytometry, Raman & more

For nearly 30 years, RPMC’s selection of Long Coherence Length Lasers has set the standard for affordable precision across a wide range of applications, from defense to medical, industrial, and research with 1000’s of successful units in the field. We understand that every application has unique requirements, which is why our configurable platforms are designed to offer the perfect fit for your needs. As your partner, we’re here to guide you through the selection process, ensuring that your long coherence length laser integrates seamlessly into your existing systems. With time-tested technology that balances power and precision, we’re committed to supporting your success every step of the way.

Don’t hesitate to ask us anything!

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Picture Part Number Wavelength (nm) Description Type
LGK-XXX 543, 594, 633 He-Ne Laser Module, Single mode, 543-633nm, up to 20mW HeNe Lasers, Narrow Linewidth, Long Coherence Length, Single Longitudinal Mode (SLM), Collimated Beam, Fiber-Coupled
LGR-XXX 543, 594, 633 He-Ne Laser Replacement Tube, Single mode, 543-633nm, up to 20mW HeNe Lasers, Narrow Linewidth, Long Coherence Length, Single Longitudinal Mode (SLM), Collimated Beam, Fiber-Coupled
multi-wavelength CW laser beam combiners with 2 or 4 outputs LXC-Combiner Multiple Wavelength Options Laser Combiner, Single mode, up to 6 Wavelengths, 375-1064nm, up to 500mW LD Module, CW DPSS Lasers, Narrow Linewidth, Long Coherence Length, Single Longitudinal Mode (SLM), Multi Wavelength, Collimated Beam, Fiber-Coupled, Turn-Key System, Customizable
LXX-IR-SLM 785, 830, 1064 Laser Module, Stabilized, Infrared, 785-1064nm, up to 300mW LD Module, CW DPSS Lasers, Narrow Linewidth, Long Coherence Length, Single Longitudinal Mode (SLM), Collimated Beam, Fiber-Coupled, Customizable
LXX-VIS-SLM 532, 553, 561, 633 Laser Module, Stabilized, Visible, 532-633nm, up to 300mW LD Module, CW DPSS Lasers, Narrow Linewidth, Long Coherence Length, Single Longitudinal Mode (SLM), Collimated Beam, Fiber-Coupled, Customizable
a silver colored matchbox shaped & sized multi-wavelength laser beam combiner box MB-Combiner Multiple Wavelength Options Laser Combiner, Multimode/Single mode, up to 4 Wavelengths, 405-850nm, up to 150mW LD Module, CW DPSS Lasers, Narrow Linewidth, Long Coherence Length, Single Longitudinal Mode (SLM), Multi Wavelength, Collimated Beam, Fiber-Coupled, Customizable
ultra-compact matchbox sized dpss laser module MB-IR-SLM 785, 830, 1030, 1064 Laser Module, Stabilized, Infrared, 783-1064nm, up to 1000mW LD Module, CW DPSS Lasers, Narrow Linewidth, Long Coherence Length, Single Longitudinal Mode (SLM), Collimated Beam, Fiber-Coupled
520L-2XA: 520nm SLM Laser (VBG Diode; MATCHBOX 2) MB-VIS-SLM 405, 488, 520, 633 Laser Module, Stabilized, Visible, 405-633nm, up to 170mW LD Module, CW DPSS Lasers, Narrow Linewidth, Long Coherence Length, Single Longitudinal Mode (SLM), Collimated Beam, Fiber-Coupled

Long coherence length lasers are specifically engineered to maintain phase stability over extended distances, making them indispensable in high-precision applications like holography, interferometry, and advanced telecommunications. These lasers typically operate in single mode to ensure minimal linewidth, allowing for exceptional measurement accuracy and signal integrity. RPMC’s high-coherence lasers are ideal for demanding tasks like DNA sequencing, flow cytometry, and Raman spectroscopy, where coherence is crucial for accuracy. With advanced stabilization technologies, including DFB and VBG configurations, as well as temperature and current-stabilized DPSS options & stabilized HeNe lasers, our solutions are tailored to meet diverse industry needs. Whether in analytical chemistry, digital imaging, or specialized metrology, our solutions deliver reliable, long-term performance for the most exacting scientific and industrial applications.

Let Us Help

With 1000s of fielded units, and over 25 years of experience, providing OEMs, contract manufacturers, and researchers with the best laser solution for their application, our expert team is ready to help! 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. Furthermore, you can email us at [email protected] to talk to a knowledgeable Product Manager.

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.

We’re experts at helping select the right configuration for you!

Component FAQs
Can I operate multiple laser diodes from the same power supply?

Can I operate multiple laser diodes from the same power supply?

The same power supply can drive multiple laser diodes if they are connected in series, but they must never be connected in parallel. When two diodes are connected in series, they will function properly as long as the compliance voltage is large enough to cover the voltage drop across each diode. For example, suppose you are trying to power two diode lasers, each with an operating voltage of 1.9 V, and connect the two in series. In that case, the pulsed or CW laser driver must have a total voltage capacity greater than 3.8 V. This configuration works because diodes share the same current when connected in series. In contrast, when two diodes are connected in parallel, the current is no longer shared between the two diodes. Get more details on the topic in this article: “Can I Operate Multiple Laser Diodes From the Same Power Supply?” Get more information from our Lasers 101, Blogs, Whitepapers, FAQs, and Press Release pages in our Knowledge Center!

Can laser diodes emit green, blue, or UV light?

Can laser diodes emit green, blue, or UV light?

The output wavelength of a semiconductor laser is based on the difference in energy between the valance and conduction bands of the material (bandgap energy). Since the energy of a photon is inversely proportional to its wavelength, this means that a larger bandgap energy will result in a shorter emission wavelength. Due to the relatively wide bandgap energy of 3.4 eV, gallium nitride (GaN) is ideal for the production of semiconductor optoelectronic devices, producing blue wavelength light without the need for nonlinear crystal harmonic generation. Since the mid-’90s, GaN substrates have been the common material utilized for blue LEDs. In recent years, GaN based laser technology has provided blue, green and UV laser diodes, now available in wavelengths from 375 nm to 521 nm, with output powers exceeding 100 watts. Read our article, titled “Gallium Nitride (GaN) Laser Diodes: Green, Blue, and UV Wavelengths” to learn more about GaN Based Laser Diodes, available through RPMC. Get more information from our Lasers 101, Blogs, Whitepapers, and FAQs pages in our Knowledge Center!

How long will a laser diode last?
How long will a laser diode last?

Honestly, it depends on several factors, and there is no simple chart to cover everything. Typical diode lifetimes are in the range of 25,000 to 50,000 hours. Though, there are lifetime ratings outside this range, depending on the configuration. Furthermore, there are a wide range of degradation sources that contribute to a shorter lifespan of laser diodes. These degradation sources include dislocations that affect the inner region, metal diffusion and alloy reactions that affect the electrode, solder instability (reaction and migration) that affect the bonding parts, separation of metals in the heatsink bond, and defects in buried heterostructure devices. Read more about diode lifetime and contributing factors in this article: “Understanding Laser Diode Lifetime.” Get more information from our Lasers 101, Blogs, Whitepapers, FAQs, and Press Release pages in our Knowledge Center!

What factors affect the lifetime of laser diodes?
What factors affect the lifetime of laser diodes?

There are a great many factors that can increase or decrease the lifetime of a laser diode. One of the main considerations is thermal management. Mounting or heatsinking of the package is of tremendous importance because operating temperature strongly influences lifetime and performance. Other factors to consider include electrostatic discharge (ESD), voltage and current spikes, back reflections, flammable materials, noxious substances, outgassing materials (even thermal compounds), electrical connections, soldering method and fumes, and environmental considerations including ambient temperature, and contamination from humidity and dust. Read more about these critical considerations and contributing factors in this article: “How to Improve Laser Diode Lifetime: Advice and Precautions on Mounting.” Get more information from our Lasers 101, Blogs, Whitepapers, FAQs, and Press Release pages in our Knowledge Center!

What is a laser diode?
What is a laser diode?

A Laser Diode or semiconductor laser is the simplest form of Solid-State Laser. Laser diodes are commonly referred to as edge emitting laser diodes because the laser light is emitted from the edge of the substrate. The light emitting region of the laser diode is commonly called the emitter. The emitter size and the number of emitters determine output power and beam quality of a laser diode. Electrically speaking, a laser diode is a PIN diode. The intrinsic (I) region is the active region of the laser diode. The N and P regions provide the active region with the carriers (electrons and holes). Initially, research on laser diodes was carried out using P-N diodes. However, all modern laser diodes utilize the double-hetero-structure implementation. This design confines the carriers and photons, allowing a maximization of recombination and light generation. If you want to start reading more about laser diodes, try this whitepaper “How to Improve Laser Diode Lifetime.” If you want to read more about the Laser Diode Types we offer, check out the Overview of Laser Diodes section on our Lasers 101 Page!

What is the difference between laser diodes and VCSELs?
What is the difference between laser diodes and VCSELs?

Laser Diodes and VCSELs are semiconductor lasers,  the simplest form of Solid State Lasers.  Laser diodes are commonly referred to as edge emitting laser diodes because the laser light is emitted from the edge of the substrate. The light emitting region of the laser diode is commonly called the emitter.  The emitter size and the quantity of emitters determine output power and beam quality of a laser diode. These Fabry Perot Diode Lasers with a single emission region (Emitter) are typically called laser diode chips, while a linear array of emitters is called laser diode bars. Laser diode bars typically use multimode emitters, the number of emitters per substrate can vary from 5 emitters to 100 emitters. VCSELs (Vertical Cavity Surface Emitting Laser) emit light perpendicular to the mounting surface as opposed to parallel like edge emitting laser diodes.  VCSELs offer a uniform spatial illumination in a circular illumination pattern with low speckle. If you want to read more about lasers in general, and help narrowing down the selection to find the right laser for you, check out our Knowledge Center for our Blogs, Whitepapers, and FAQ pages, as well as our Lasers 101 Page!VCSEL

What’s the difference between single transverse mode & single longitudinal mode?

What’s the difference between single transverse mode & single longitudinal mode?

Within the laser community, one of the most overused and often miscommunicated terms is the phrase “single mode.”  This is because a laser beam when traveling through air takes up a three-dimensional volume in space similar to that of a cylinder; and just as with a cylinder, a laser beam can be divided into independent coordinates each with their own mode structure.  For a cylinder we would call these the length and the cross-section, but as shown in the figure below for a laser beam, we define these as the transverse electromagnetic (TEM) plane and the longitudinal axis.   Both sets of modes are fundamental to the laser beam’s properties, since the TEM modes determine the spatial distribution of the laser beams intensity, and the longitudinal modes determine the spectral properties of the laser.  As a result, when a laser is described as being “single-mode” first you need to make sure that you truly understand which mode is being referred to.  Meaning that you must know if the laser is single transverse mode, single longitudinal mode, or both. Get all the information you need in this article: “What is Single Longitudinal Mode?” Get more information from our Lasers 101, Blogs, Whitepapers, FAQs, and Press Release pages in our Knowledge Center!

CW Lasers FAQs
How do I align my optical system?

How do I align my optical system?

Laser alignment can be a challenging task, but aligning a laser beam doesn’t have to be as complicated as it might seem with the right optical alignment tools and proper laser alignment techniques. Multiple optical alignment techniques have been developed over the years, utilized by technicians and engineers to simplify the alignment process. With the development of these universal laser beam alignment methods, along with some laser alignment tips and tricks, you don’t need to be a laser expert to perform your alignments with relative ease, ensuring your laser beam path is right where you want it to be and your beam is on target every time. Read our article, titled “Laser Alignment: HeNe Lasers, Methods, and Helpful Tips” to get the knowledge and advice you need for proper optical beam path alignment utilizing HeNe Lasers. Get more information from our Lasers 101, Blogs, Whitepapers, FAQs, and Press Release pages in our Knowledge Center!

Should I choose multimode or single-mode for Raman spectroscopy?
Should I choose multimode or single-mode for Raman spectroscopy?

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. The first question you should ask yourself when considering which type of laser to choose is whether you are doing microscopy or bulk sampling.  If the answer to that question is microscopy, then you immediately should go with a single mode laser.  Since the goal of any microscopy system is to produce the highest resolution image possible, the number one consideration should be how tightly can the laser beam be focused down. However, there are several other considerations when choosing between multimode and single-mode. Learn which is best for you in this article: “Multimode vs Single-Mode Lasers for Raman Spectroscopy.” Get more information from our Lasers 101, Blogs, Whitepapers, FAQs, and Press Release pages in our Knowledge Center!

What is a CW Laser?
What is a CW Laser?

A CW or continuous-wave laser is any laser with a continuous flow of pump energy. It emits a constant stream of radiation, as opposed to a q-switched or mode-locked pulsed laser with a pulsed output beam. A laser is typically defined as having a pulse width greater than 250 ms. The first CW laser was a helium-neon (HeNe) gas laser, developed in 1960, which you can read more about in this blog “HeNe Lasers: Bright Past, Brighter Future.” If you want to read more about the types of CW Lasers we offer, check out the Overview of CW Lasers section on our Lasers 101 Page!

What is the best laser for optical surface flatness testing?
What is the best laser for optical surface flatness testing?

It is essential that the laser exhibit a high level of spectral stability, ensuring that any changes in the interference pattern are caused by features in the sample and not originating from the laser beam. In addition to spectral stability, high beam pointing stability ensures consistent measurements by mitigating any beam position drift concerning the position of the sample. Lasers with longer coherence lengths, and subsequently narrower linewidths, play an important role in determining the resolution of the measurement, as well as consideration of the wavelength used. Exhibiting both single longitudinal mode and single spatial mode has excellent benefits. To get more details on preferred laser sources for interferometry in this article: “Stable, Narrow Linewidth, CW DPSS Lasers for Precision Interferometry.” Get more information from our Lasers 101, Blogs, Whitepapers, FAQs, and Press Release pages in our Knowledge Center!

What type of laser do I need for confocal microscopy?
What type of laser do I need for confocal microscopy?

The short answer is: You have some flexibility, but the laser source should be PM fiber-coupled and have a low noise, TEM00 beam mode. The excitation bandwidth of the fluorophores used must overlap with the laser wavelength, as various fluorophores need different wavelengths. So, you may require multiple lasers, which means you’ve got a beam combining alignment challenge to tackle. One way to avoid this is through the convenience of Multi-Wavelength Beam Combiners.

If you want to learn more on the subject of confocal fluorescence microscopy, ideal laser sources, and the benefits of beam combiners, check out this white paper: “Multi-Wavelength Laser Sources for Multi-Color Fluorescence Microscopy.” Get more information from our Lasers 101, Blogs, Whitepapers, FAQs, and Press Release pages in our Knowledge Center!

What type of laser is best for Doppler LIDAR?

What type of laser is best for Doppler LIDAR?

Various LIDAR signal methods for measuring velocity have one critical requirement in common, the need for precise control over laser frequency. While a wide variety of single-frequency lasers have been used in Doppler LIDAR research, the industry as a whole has adopted single-frequency fiber lasers as the ideal light source. Fiber lasers have several advantages over traditional DPSS lasers, all of which derive from the geometry of the fiber optic itself, namely the innate ability to have an extremely long single-mode optical cavity. This geometry allows for the production of either extremely high-power, single-mode lasers producing unprecedented brightness, or extremely narrow band lasers, with near perfect single-frequency output. If you want to learn more about Doppler LIDAR, the critical considerations involved, and ideal laser sources, check out this whitepaper: “Single-Frequency Fiber Lasers for Doppler LIDAR.” Get more information from our Lasers 101, Blogs, Whitepapers, FAQs, and Press Release pages in our Knowledge Center!

What’s the difference between single transverse mode & single longitudinal mode?

What’s the difference between single transverse mode & single longitudinal mode?

Within the laser community, one of the most overused and often miscommunicated terms is the phrase “single mode.”  This is because a laser beam when traveling through air takes up a three-dimensional volume in space similar to that of a cylinder; and just as with a cylinder, a laser beam can be divided into independent coordinates each with their own mode structure.  For a cylinder we would call these the length and the cross-section, but as shown in the figure below for a laser beam, we define these as the transverse electromagnetic (TEM) plane and the longitudinal axis.   Both sets of modes are fundamental to the laser beam’s properties, since the TEM modes determine the spatial distribution of the laser beams intensity, and the longitudinal modes determine the spectral properties of the laser.  As a result, when a laser is described as being “single-mode” first you need to make sure that you truly understand which mode is being referred to.  Meaning that you must know if the laser is single transverse mode, single longitudinal mode, or both. Get all the information you need in this article: “What is Single Longitudinal Mode?” Get more information from our Lasers 101, Blogs, Whitepapers, FAQs, and Press Release pages in our Knowledge Center!