Many people are asking whether the QSI laser diode is stable or not. Next, Xiaobian will briefly tell you how it is. I hope this article can help you.

QSI itself is a relatively complete manufacturer of laser diode/compound semiconductor devices, which mainly has the process of EPI → FAB → PACK.

This upstream and downstream integration means that the design, manufacturing and packaging of devices can be well controlled, which is beneficial to the stability of device performance in theory.

Even so, from the practical engineering experience, "stability" is not "absolutely no problem", but "good stability if the environment, drive, electric heating and light reflection are well managed".

Laser diodes are sensitive to temperature. Even if the performance of the device itself is good, if the heat sink is not good, the ambient temperature fluctuates greatly and the heat dissipation is not good, power drift, wavelength drift and service life will be shortened.

Drive, current and voltage management, if the drive circuit is not well designed (current spike, reflected light backflow, not well protected), even if the device is good, it may cause instability or early failure.

Reflected light and optical feedback: If the optical system of the laser diode is not properly designed in use, for example, the reflected light at the output end returns to the device or is reflected by the coupling optical fiber, it may also lead to "laser reflection back" damage or unstable power.

What I have introduced to you above is the relative stability of QSI laser diode in the laser market, and I hope it will be helpful to you.