We all know that laser semiconductor equipment is widely used in daily life. Many people ask whether picosecond laser is laser semiconductor equipment. Let's take a look at it together.

The principle of luminescence is completely different.

What is a semiconductor laser (LD)?

You can think of it as an enlarged version of a laser diode, which emits light directly through a PN junction.

This kind of laser is typically used for communication, bar, pump and optical fiber coupling.

What is a picosecond laser?

Picosecond laser is an ultrashort pulse laser with a pulse width of only 10 seconds. What is this concept?

That is, after the light hits the material, the material is "vaporized" before the heat can be transferred out.

We call it cold working.

It is not directly emitted by diode, but usually: solid-state laser, Yb/Nd doped medium, plus passive or active mode locking.

The structure of picosecond laser and LD are simply not a system.

The output mode is completely different.

Semiconductor laser (LD)

Most of them are continuous light (CW) or millisecond pulses.

The wavelength is stable, but the spot quality is average.

Large heat affected zone

Typical characteristics:

High power and dense energy, but moderate beam quality and obvious thermal effect.

Picosecond laser

Ultrashort pulse

The single pulse energy is large, but the average power can be small.

The spot quality is very high (TEM00)

Minimum heat affected zone

Typical characteristics:

Fine, no burning edges, no smoke, clean edges.

These are the differences between laser semiconductor devices and picosecond lasers. I hope you will have a clear understanding after reading them.