Laser Tungsten Copper Bar

Laser Tungsten Copper Bar
Lasers come in many different qualities, and carbon dioxide lasers are still
used in certain specific situations. However, solid-state lasers are
currently the main type, and semiconductor lasers are the most common. The
use of "crystal" oxygen-free copper heat sinks was prevalent over a decade or
two ago. The power density was relatively low, and tin was typically used as
solder. Oxygen-free copper heat sinks can be utilized, nickel-plated instead
of gold-plated, but gold-plated soldering offers better reliability. The
tungsten copper bar structure was developed to meet the demands for high
power, high reliability, and long lifespan.

Early lasers primarily utilized tungsten copper C-Mount structures, which
later transitioned to tungsten copper bars. Initially, W85Cu15 was
predominant, but currently, W90Cu10 is the main composition. It is suggested
to experiment with W93Cu7 in the future.

Tungsten copper bars serve as conductors, heat sinks, and chip carriers.
Gallium nitride chips are sandwiched between them and soldered with gold-tin
solder. Several laser modules utilize tungsten copper bars, varying from a
few to dozens of pieces.

In the early days, about 10 years ago, the power of laser chips was not high,
and the requirements for tungsten copper bars were not stringent. Now, the
power is increasing, and the demands for tungsten copper bar size accuracy,
thermal expansion coefficient matching, thermal conductivity, and coating
bonding are becoming more rigorous. This is mainly evident in the need for
the thermal expansion coefficient to be close to gallium arsenide (5.9x10-
6/K), maximizing thermal conductivity, experimenting with diamond composite
materials, and enforcing strict control over key surfaces, finishes, edges
(R10 microns), and coatings (nickel, gold, platinum, and locally
prefabricated gold and tin). A decade ago, we were the sole manufacturer of
tungsten copper bars in China, but now many manufacturers are entering this
field.

Minimum Order: 10 pieces