| Product Code | Wavelength | Power | Operation Mode | Package | Bars |
|---|---|---|---|---|---|
| E2Y-940D-600C-HO1.1 | 940 nm | 300 W | QCW | Horizontal | 3 |
| E2Y-806C-360C-VH1.1 (1×6) | 806 nm | 360 W | CW / QCW | Vertical | 6 |
| C1Y-808F-3000Q-VH | 808 nm | 3000 W | QCW | Vertical | 20 |
When a single laser diode bar simply isn't enough, laser diode stacks offer the logical next step, combining multiple emitting bars into a single, compact package that delivers substantially higher output power without sacrificing beam quality or reliability. Whether you need a few hundred watts for precision pumping or several kilowatts for high-duty industrial processing, a well-engineered laser diode stack makes it possible to scale power on demand.
At ephotonics, our laser diode stack portfolio is built around one principle: giving engineers and system integrators the exact combination of wavelength, power, and operating mode they need — off the shelf, with no compromise. Each stack in our catalog is thoroughly characterized and tested before leaving our facility, so the specifications you see are the specifications you get in the field.
A laser diode stack, sometimes called a diode bar stack or multi-bar module is an assembly of multiple laser diode bars mounted in a structured array, either vertically or horizontally and thermally managed through a common heat sink. Stacking bars in this way multiplies the total optical output while keeping the footprint surprisingly small. The result is one of the most power-dense light sources available in photonics today.
The number of bars in a stack, typically ranging from 3 to 20 or more, directly determines the peak output power. Our lineup includes configurations from compact 3-bar horizontal stacks suited to pulse-pumped solid-state lasers, all the way up to 20-bar vertical stacks capable of delivering 3,000 W of peak power in QCW operation.
One of the most important decisions when selecting a laser diode stack is the operating mode. Continuous wave (CW) stacks deliver a constant, uninterrupted beam, ideal for applications where sustained thermal energy is required, such as direct diode material processing or fiber laser pumping. Quasi-continuous wave (QCW) stacks, on the other hand, operate in short, high-power pulses, which allows the diode bars to reach much higher peak powers than they could sustain continuously, while keeping average thermal load manageable. Some stacks in our range support both modes, giving system designers maximum flexibility as their requirements evolve.
Our stacks are available at key wavelengths, including 806 nm, 808 nm, and 940 nm, each chosen for specific absorption characteristics in common gain media. The 808 nm wavelength remains the workhorse of Nd:YAG and Nd:YVO₄ pumping, offering excellent absorption efficiency and well-established driver ecosystems. The 806 nm variant is particularly well suited to alexandrite and other broadband gain media. At 940 nm, the reduced quantum defect compared to 808 nm makes it an attractive choice for Yb:YAG systems where thermal management is a priority.
Package orientation matters more than it might seem. Vertical laser diode stacks stack bars along the slow axis, producing a beam geometry that is often easier to collimate with standard cylindrical optics, making them the preferred choice for end-pumped and side-pumped laser architectures. Horizontal stacks offer a different beam profile that can be advantageous in certain free-space coupling arrangements. ephotonics offers both configurations, and our team is always available to help match the right geometry to your optical design.
If you don't see the exact configuration you need in the table above, reach out directly. We regularly work with customers on custom bar counts, wavelengths, and cooling configurations and we'd rather have that conversation early than have you compromise your system design.
