The Advantage of diode laser stack with FAC

What is FAC?

FAC (Fast-Axis-Collimator) is a fast-axis collimator; FAC (fast-axis collimator) lens has

excellent collimation and light transmittance. FAC lens is an important optical component on

semiconductor lasers. For beam shaping and Renovation is very important.

                                                        Light out without FAC

Diode laser bar has divergence charactor with fast-axis 32℃ and slow-axis 8℃, Without FAC, the outgoing light appears to diverge, as above picture. 

                                                               Light out with FAC 

After the collimating lens is added, the lens can change the propagation direction of the original divergent light through the characteristics of its own refractive index to reach the designated target position, and two interface refractions occur on the path.

                            Module effect diagram analysis

Without a collimating lens, as shown in the figure above, due to the divergence angle characteristics of the bar itself, some stray light will be generated after multiple side reflections of the optical waveguide (as shown in the blue part of the above figure); in addition, after being derived from the optical waveguide, the laser presents an optical Diffraction and divergence, the constant loss of uniformity of energy in the far field

After adding the collimation, as shown in the figure above: the divergent light lasing from the diode laser Bar, it is optically shaped by the collimating lens, and the optical path is designed and calculated in advance, and then multiple shaping trajectories are assembled at a specific position in the far field to achieve the uniformity of the surface. The customized light spot can be realized within a certain far-field range.

What is the function of FAC fast axis collimation compression technology?

Semiconductor lasers using FAC fast axis collimation compression technology:

It can effectively reduce the divergence angle of the laser output; make the laser output more uniform, and the energy is more concentrated; it can reduce the damage caused by the optical path return to the laser.

1) Schematic diagram of the light output of the handle of the laser with FAC fast axis collimation:

2) Schematic diagram of the light output of the handle of the laser without FAC fast axis

collimation:

What are the advantages of the semiconductor laser handle using the FAC fast axis collimation and compression technology?

(1) The semiconductor laser handle using FAC collimation and compression technology can

effectively reduce the divergence angle of the laser output, so that the output laser of the handle is

more uniform, the energy is more concentrated, and the clinical hair removal effect is better.

(2) The semiconductor laser handle using FAC collimation and compression technology can

reduce the damage of the laser caused by the optical path return, thereby effectively improving the

service life of the handle laser;

(3) The semiconductor laser handle using FAC collimation and compression technology can

reduce the laser output divergence angle and reduce the optical path return loss, thereby reducing

the light and heat loss and effectively improving the cooling effect of the handle;

(3) Lasers using FAC fast-axis collimation technology have more stable performance and lower

repair rates, and have become mainstream products.

Comparison of laser with FAC and laser without FAC:

(500W, 1200W laser comparison chart)

500W laser module

                    NO FAC                                           Have FAC

1200W laser module

                             NO FAC                                                 Have FAC

The comparison between the high-power handle with FAC handle and the handle

without FAC:

(1) Comparison in pre-combustion state:

                    Have FAC                                                           NO FAC

(2) Contrast of light spots in light-emitting state (light spots at the same height)

                   Have FAC                                                                       NO FAC