JOLD-Stacks

Laser Diode Bar Stack, 760-1070nm, up to 2400 W

Key Features:

  • Scalable output power up to 2400W
  • CW & QCW configurations
  • High reliability & long lifetime
  • FAC or FAC/SAC collimation lensing options
  • Passive & active cooling options
  • Fully customizable solutions

Get help selecting the right configuration for you!

If you do not see exactly what you need, please contact us!

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.

Your OEM Laser Diode Solution Awaits!

Many configuration options available:

  • Wavelength: Options from 760-1070 nm (multi-wavelength stacks available for “color mixing”)
  • Optical output power: number of bars per stack
  • Operating mode: CW or QCW/long-pulse
  • Cooling: active with DI or tap water or passive/conductive
  • Packaging: with or without housing and protective window option
  • Lensing: FAC or FAC/SAC lensing available

Passively Cooled Stacks:

QCW- and long-pulse configurations utilize vertical stacks made up of CTE-matched submounts on Direct-Copper-Bonded (DCB) substrates. This type of vertical stack clearly offers several advantages:

  • Tap water or passive cooling of the DCB
  • Light-weight
  • Small footprint
  • Compact multi-stack arrangements offering additional power scaling  (multi-stack packages)
  • Ideal for Medical applications like laser-based therapy for ophthalmology, dermatology, and esthetics
Passively Cooled QCW Stack Examples

Other wavelengths, heat sink variants, and configurations upon request. Let us know what you need!

Wavelength (nm) Output Power (W) Operation Mode Cooling Collimation Datasheet
808 1560 QCW Passive Fast axis JOLD-1560-QAF-2x8A-med
808 1600 QCW Passive Without JOLD-1600-QA-2x8A-med
808 2160 QCW Passive Without JOLD-2160-QF-8A
808 2400 QCW Passive Without JOLD-2400-Q-8A
808 2400 QCW Passive Without JOLD-2400-QA-8A-industry
940 2160 QCW Passive Without JOLD-2160-QF-8A
940 2400 QCW Passive Without JOLD-2400-Q-8A
940 2400 QCW Passive Without JOLD-2400-QA-8A-industry

Let us help choose the right configuration for YOU!

Actively Cooled Stacks:

Microchannel-cooled packages (MCCP) which are actively cooled with DI water for CW-operation, utilizing best-known practices regarding microchannel designs, DI-water specification, and cooling circuit maintenance, enabling package-limited lifetimes > 10k hours – relevant for industrial applications:

  • DI-water cooling for MCC packages
  • Light-weight
  • Small footprint
  • Compact multi-stack arrangements offering additional power scaling  (multi-stack packages)
  • Ideal for Material Processing & DDL applications like welding, soldering, hardening, and annealing
Actively Cooled CW Stack Examples

Other wavelengths, heat sink variants, and configurations upon request. Let us know what you need!

Wavelength (nm) Output Power (W) Operation Mode Cooling Collimation Datasheet
808 360 CW Active Fast axis JOLD-360-CAFN-8A
808 400 CW Active Without JOLD-400-CANN-8A
808 576 CW Active Fast axis JOLD-576-CAFN-8A
808 600 CW Active Without JOLD-600-CANN-12A
808 640 CW Active Without JOLD-640-CANN-8A
808 800 CW Active Without JOLD-800-CANN-10A
808 960 CW Active Without JOLD-960-CANN-12A
940 440 CW Active Fast axis JOLD-440-CAFN-4A
940 480 CW Active Without  JOLD-480-CANN-4A
940 660 CW Active Fast axis JOLD-660-CAFN-6A
940 720 CW Active Without JOLD-720-CANN-6A
940 1080 CW Active Fast axis JOLD-1080-CAFN-12A
940 1200 CW Active Without JOLD-1200-CANN-12A


Let us help choose the right configuration for YOU!

Benefits:

  • Modular Power Scaling:
    • Vertical stacking of individual sub-mounts within multi-laser-bar packages
    • Highly modular approach for power scaling well into the kW-range
    • Flexibly scale-up a laser stack to the requested power level at a given center wavelength
  • Optimized Beam Quality:
    • Beam quality (beam-parameter-product, BPP) optimized with lowest pitches
    • Neighboring stack distance approaching 1.0 mm without compromising on cooling capacity of the submounts
  • Proven Reliability:
    • Tried & tested under application-specific conditions ranging from medical, industrial to mission-critical end use
    • Proven hard-solder technology that covers even the harshest environmental conditions
    • Strictly monitored production in clearly defined processes based on certifications
  • Customization and Design Flexibility for Comprehensive Solutions:
    • Tailored solutions to meet your unique application requirements
    • Reliable laser solutions, providing you with the specifications you need
    • From wafer to component, module, and beyond – let us know what you need!

Don’t hesitate to ask us anything!

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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!