VCSEL is a kind of vertical cavity surface emitting Laser based on gallium arsenide semiconductor material. Different from other light sources such as LED(light emitting Diode) and LD(Laser Diode), VCSEL has the advantages of small size, circular output spot, single vertical mode output, small threshold current, low price, easy integration as a large area array, etc. Widely used in optical communication, optical interconnection, optical storage and other fields.

For example, the iPhone X's 3D sensing technology is now very popular in mobile phones, tablets, and computers.

The VCSEL base consists of three parts: the top Bragg reflector (P-DBR), the resonator, and the bottom N-DBR. Generally, DBR consists of 20-40 pairs of thin films.

The thickness of the resonator is generally about a few microns, compared with the gain length of the side emitter, the gain length of the active layer of the VCSEL laser is very small (tens of nanometers), and in order to achieve lasing, the DBR must have a high reflectivity (generally greater than 99%). At the bottom of the device is generally a GaAs substrate.

Therefore, VCSEL is a new high-power semiconductor laser, and its output power is increased by optimizing DBR, which has a problem of thermoelectric separation. And its output power is very high, VCSEL chip will also have the risk of too much internal stress during thermal expansion.

And Sliton ceramic circuit board can solve this problem well. DPC technology can easily complete the manufacturing of high-precision microelectronics and even nanoelectronic devices, and more solid and low-resistance metal film layer: the combination strength of the metal layer on the product and the ceramic substrate is high, and the maximum can reach 45MPa (greater than the strength of the ceramic sheet itself); The electrical conductivity of the metal layer is good, for example, the volume resistivity of the copper obtained is less than 2.5× 10-6ω.cm, and the heat is small when the current passes through. At the same time, it has higher thermal conductivity and thermal expansion coefficient, which can solve the problems of internal stress caused by thermoelectric separation and high power.

We believe that in the future market of VCSEL, Slitong will certainly have a wider application, we will continue to innovate and work hard to provide our customers with better service!

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