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  HOLO/OR Newsletter- October 2021
ㆍ작성자: 전재필 ㆍ작성일: 2021-10-25 (월) 08:33 ㆍ조회: 51


 APPLICATIONS SPOTLIGHT – IT’S ALL ABOUT THE SPEED!

 

Enhancing laser welding speed by > 50% with HOLO/ORs Flexishaper 

 

A diffractive beam shaping solution that generates a controlled and adjustable full-range ring-to-spot intensity distribution ratio

 


Many industrial welding system integrators desire to increase the processing speed of their systems, and up until recently increasing the laser power was typically enough in order to achieve that goal. Lately, thanks to the availability of high-powered NIR fiber lasers at affordable costs, power is practically no longer the limiting processing speed factor.

 

Nonetheless, the process developers often encounter other physical phenomena which are dominant at high powers and high speeds and prevent welding at the desired available paces. Such phenomena include humping, undercut and more as seen in the image of the different seem qualities.
 

These phenomena can be substantially reduced, enabling significant (>50%) increase in welding speed, by using HOLO/OR’s Flexishaper beam shaping module for controlled and adjustable ring-to-spot ratio.

Flexishaper is a diffractive-shaping solution which consists of two identical diffractive optical elements (DOEs) placed on the same optical axis. When the elements are rotated against one another, the output beam profile changes from 100% of the power in the central spot to ~80% of the power at the surrounding ring with almost no energy at the center. The rotation is continuous and allows for full range control over the power ratio in between these states.

 


Flexishaper measurements from lab demonstrator.
Watch the full rotation range output video here

 

The Flexishaper module was designed for process developers to enable finding the optimal power ratio between the spot and the ring suitable for their unique process parameters and system set-up. Once the optimal work point is established - HOLO/OR can manufacture a  single custom DOE generating that output ratio for the series production, making Flexishaper even more cost effective.

Learn more here >>

 

Record breaking processing speeds for laser surface texturing now enabled with DLITe beam splitter

 

Towards Rapid Fabrication of Superhydrophobic Surfaces by Multi-Beam Nanostructuring including a total of 40,401 Beams

 


Surface texturing of superhydrophobic surfaces is long sought after, but so far was only available for very few small scaled applications due to the long processing durations, preventing it from becoming a relevant technology for large scale industrial applications, albeit the attraction.

 

Applications such as de-icing, anti-corrosion, self-cleaning or drag-reduction of surfaces can be easily achieved with laser micro and nanostructuring. Most known available solutions improve processing speed by hundred to a thousand times, however, when precise nanostructuring is required, a much higher number of beams are needed in order to enable truly productive and efficient commercial applications utilizing the new generation of kW-class ultrashort pulsed (USP) lasers.

 


This is where Diffractive Laser-Induced Texturing element (DLITe) fits in. DLITe is a multi-beam generator which can split the input beam into an unlimited number of beams. In the latest collaboration with HiLASE center, a high-energy USP laser system was used, delivering up to 20 mJ at 1030 nm in 1.7 ps. The system was integrated with a novel DLITe, producing 201 × 201 sub-beams of 5 µm in diameter on a square area of 1 mm2. 

 

Simultaneous nanostructuring with 40,401 sub-beams resulted in a matrix of microcraters covered by nano-gratings and ripples with periodicity below 470 nm and 720 nm, respectively. The processed area demonstrated hydrophobic to superhydrophobic properties with a maximum contact angle of 153°.
Read the full article here >>
See available DLITe designs and ask for quote here >>

 

 NEW PRODUCTS

 

Now available - Cost effective diffractive vortex generator for microscopy laser applications

 

Vortex phase plates are often used in advanced microscopy, mostly in the STED and laser tweezing applications. By adding a vortex phase plate, it is possible to shape the spot to a donut-like distribution, with a central hole that is smaller than the diffraction limit. This enables sub-diffraction limited optical resolution by depleting fluorescent excitation in all areas outside the hole (as is done in STED), or trapping and manipulating very small particles, as is done in tweezing.

HOLO/OR’s new microscopy vortex phase plates offer unparallel phase profile accuracy, providing precise shaping to a symmetrical donut, with no undefined area in the center of the plate. Our new vortex generators have a high LDT, suitable for illumination with > 1000 W of laser power, are stable at typical microscopy environmental conditions (-40 to +120 0C) and can be easily integrated into existing setups due to their compact dimensions. They can be mounted in standard 1’’ holder frames to facilitate integration into the laser light path.

HOLO/OR has recently developed a new production process which enables us to offer these elements at affordable and competitive costs to meet the growing market’s needs.
See available vortex phase plate generators here >>

 

You ask, we oblige - New DeepCleave designs with extended depth of focus – now available!

 

After receiving responses and requests from several of our customers for an extended working distance DeepCleave module for glass cutting, HOLO/OR has issued an additional 2 designs with depth of focus (DOF) in air between 15-25mm:

PN