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Sapphire Wafer

Photonik Feb2014.pdf

Photonik Feb2014.pdf

…separated sapphire wafers are reusable as
GaN growth wafers.
Separating the sapphire wafer from the
GaN is done by means of the 248
nm
excimer laser, which selectively irradiates
the GaN through the sapphire wafer. At
such short UV wavelength sapphire is virtually…

LLO WavelengthAdvantage.pdf

LLO WavelengthAdvantage.pdf

…operating at 248 nm, is the first choice for LLO. 248nm line sapphire wafer separation The figure below is a white light interferometry image of a gallium nitride (GaN) epi-wafer after LLO processing and removal of the sapphire wafer. Clearly visible is the regular pattern of trenches but prior to…

Sub-Systems for Cutting

Sub-Systems for Cutting

…for cutting thermally sensitive or hard to machine materials (such as ceramics, sapphire and glass) with essentially no heat affected, through nanosecond pulse width sources for rapid, cost effective cutting of wafers in microelectronics fabrication All Sub-Systems for Cutting PowerLine AVIA NX…

Microsoft Word - Coherent Whitepaper - Laser Processing of µLED

Microsoft Word - Coherent Whitepaper - Laser Processing of µLED

…film from sapphire wafer.
The LEDs are processed on the sapphire growth substrate to the level that a temporary or
final carrier substrate is attached. In the subsequent LLO process, the LED wafer is exposed to
high intensity UV laser pulses directed through the sapphire substrate,…

CMM 11.5.indd

CMM 11.5.indd


the actual wafer diameter. Excimer
laser optical system configurations
support up to 8 in. wafer processing
requirements.
The LB 155 system features a
150 W LEAP laser and with a 248 nm
wavelength is designed to match a
6 in. sapphire wafer in a single scan.…

Solar High Efficiency AR Coatings

Solar High Efficiency AR Coatings

…Marking on sapphire
A final example of high value marking is producing bar codes and other
marks on the sapphire wafers used as substrates in the production of high
brightness LEDs. These are typically lot numbers and other identifying
information placed on the sapphire after LED…

Helios Whitepaper2014.pdf

Helios Whitepaper2014.pdf

…and produce
more traditional marks on glass and sapphire. In this
case, marks are typically on the order of 10 µm deep in
order to make them clearly visible. One particular
application is in marking the sapphire wafers used as
substrates in the production of high brightness…

Laser Focus World - February 2018

Laser Focus World - February 2018

…in
marking the aluminum cases of tablet
computers and other compact handheld
electronic devices, as well as marking the
sapphire wafers used in the production
of high-brightness LEDs (a notoriously
hard material to mark). Given the limitations of marking stainless steel…

Industrial Photonics - October 2014

Industrial Photonics - October 2014

…visible. One
particular application is in marking the sapphire wafers
used as substrates in the production of high-brightness
LEDs. The marks are typically lot numbers and other
identifying information placed on the sapphire after
LED structures have been created - i.e.,…

Microsoft Word - Coherent Whitepaper - Marking Stainless Steel Medical Devices

Microsoft Word - Coherent Whitepaper - Marking Stainless Steel Medical Devices

…computers and other compact hand-held
electronic devices. And recently picosecond lasers have been employed in the marking of
sapphire wafers - a notoriously hard material to mark - for use in the production of high
brightness LEDs.
Given the limitations of marking stainless…

SST 2017-09 Laser Marking.pdf

SST 2017-09 Laser Marking.pdf

…GaAs, GaN/sapphire
or other semiconductors. Silicon is partially transFIGURE 5. d) leadframe mark
FIGURE 5. c) backside of silicon wafer marked with
characters <150 µm in height
FIGURE 5. a) Gold pad marked on flexible IC substrate
FIGURE 5. b) IC substrate marked…

HighValueMarkingApps.pdf

HighValueMarkingApps.pdf

…marking is the production of bar codes and other marks on the sapphire wafers used as substrates in the production of high brightness LEDs. These marks are typically lot numbers and other identifying information placed on the sapphire after the LED structures have been created i.e. after a…