QCW Introduction

QCW (Quasi-continuous wave) fiber lasers are now part of the equation for modern applications. They can operate in both CW and high-peak power pulsed modes. Unlike traditional CW lasers, for QCW Fiber Lasers Come of Age Wall-plug efficiency, high PPR are just two benefits of new laser technology FABRICATING which peak and average power are always the same in CW and CW/ modulated regimes, QCW lasers’ peak power in pulsed mode is increased by a factor of 10 over the average power.

CW/QCW (Continuous Wave/Quasi-Continuous Wave) laser diode vertical stacks are high-power semiconductor laser devices that consist of multiple laser diodes integrated into a single package in a vertical configuration. These devices are commonly used in materials processing, medical equipment, printing, and imaging applications where high output power and beam quality are required.

Each laser diode in a vertical stack typically contains several individual laser emitters, and the total output power of the device can range from a few watts to hundreds of watts, depending on the number of laser diodes and the design of the device.

The fabrication process for CW/QCW laser diode vertical stacks is similar to that of other laser diode chips and modules. It involves epitaxial growth of the active and cladding layers on a substrate, followed by lithography and etching to define the device structure. The individual laser diodes are then formed by cleaving or dicing the device into smaller pieces, each containing one or more laser emitters.

The orientation of the laser diodes in a vertical stack allows for efficient cooling of the device, as the heat generated by the high power output can be dissipated through a larger surface area. In addition, the vertical configuration enables easy coupling of the output light into an optical fiber or other delivery system.

CW/QCW laser diode vertical stacks can be designed to emit light in a continuous wave (CW) mode or in a quasi-continuous wave (QCW) mode. In CW mode, the laser diodes emit a continuous stream of light, while in QCW mode, the laser diodes emit short bursts of high-intensity light with a duty cycle of typically less than 50%.

Vertical QCW diode laser stack industry excitation light source

We use Austin solder to assemble our Vertical QCW laser stack. This technology makes lasers have high reliability even in harsh working environments.

QCW & CW comparison

QCW laser diode bars can operate at higher peak powers than their CW counterparts. In addition, multiple high-peak-power QCW bars can be packaged into the same area as a single CW bar, due to the lower average waste heat of each bar running in QCW mode. These factors combine to enable compact diode pumps with very high peak powers when operating in QCW mode. In addition, QCW pumping can reduce the heat load in the laser gain medium, which tends to reduce thermal lensing effects and improve laser beam quality.

Vertical QCW diode laser stack industry excitation light source Feature

1. wavelength: 808nm or up on the requirement
2. output power: 500w up to 10kw
3. operation mode: QCW
4. cooling: actively cooled / passively cooled
5. FAC available

Vertical QCW diode laser stack industry excitation light source

Application:

• High energy research: QCW pumping sources for solid-state lasers.
• Medical technology: Long-pulse operation, use in esthietics(epilation) and dermatology.
• Excitation light source for solid-state lasers in the 1320nm range for parenchyma surgery.
• Defense: Short-pulse operation, use as a pumping source, for lighting or in LIDAR systems.
• Industry: Excitation light source for solid-state and fiber lasers.

Vertical QCW diode laser stack industry excitation light source

Specification: