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Green Problem

Sapphire-Advantage-Low-Noise.pdf

Sapphire-Advantage-Low-Noise.pdf

…instability phenomenon is called
the "green problem," [ref 1] since the first commercial
CW lasers using intra-cavity doubling were green
DPSS lasers, where the laser fundamental at
1064 nm is frequency-doubled to generate green
output at 532 nm. Of course, this can…

Verdi V-Series

Verdi V-Series

…Benefits The Verdi V-Series has a patented single longitudinal mode ring cavity architecture enabling single frequency applications. The “green noise” problem, common in other pump lasers, is eliminated with this design. Additionally, the Verdi V is available with a PZT option to lock the frequency…

Sapphire-Advantages-Summary.pdf

Sapphire-Advantages-Summary.pdf

…data quality.
How? OPSLs do not suffer from the "green noise
problem" present in many DPSS lasers.
In other intracavity doubled solid-state lasers (e.g.
DPSS), a noise-generating phenomenon called the
"green problem" causes chaotic mode dynamic
fluctuations which limit…

COHR WP OPSL No Green Noise final 5.15.18.pdf

COHR WP OPSL No Green Noise final 5.15.18.pdf

…nanosecond lasers produced by
Coherent for precision materials processing applications. But with CW operation, the green
noise problem manifests as a UV problem with increased severity because the tripling efficiency
is determined by the third power of the focused intensity. For…

Verdi G-Series

Verdi G-Series

…due to the ultra-thin gain medium (i.e. no thermal lensing issues). In addition, the short upper-state lifetime of the OPS chip removes the “green noise” problem as seen with sum frequency generated (SFG) noise in multi-longitudinal mode DPSS lasers. Single longitudinal mode options are available up…

Verdi-G-Series-Lasers-Technology-Proven-in-the-Most-Noise-Sensitive-Applications.pdf

Verdi-G-Series-Lasers-Technology-Proven-in-the-Most-Noise-Sensitive-Applications.pdf

…frequency doubling. However, many of the
earlier DPSS lasers suffer from output noise due to a
phenomenon called "green noise," or the "green
problem."
Figure 2. With DPSS lasers operating on multiple
longitudinal modes, intracavity doubling causes chaotic
mode…

COHR RLScatalog2020 interactive.pdf

COHR RLScatalog2020 interactive.pdf

…doubled to produce a 532 nm green
output beam.
This Optically-Pumped Semiconductor Laser (OPSL) technology, patented and unique to Coherent, offers numerous
benefits. The very short upper state lifetime eliminates the
well known "green noise" problem encountered with other

Vitara Preinstall.book

Vitara Preinstall.book

…extremely low noise are characteristics of OPSL lasers. In addition,
the short upper-state lifetime of the OPS chip removes the "green
noise" problem as seen in diode pumped solid-state (DPSS) lasers.
Verdi G-Series lasers are available as single or multi-transverse
mode.

2016-Ultrafast-Laser-Systems-Catalog.pdf

2016-Ultrafast-Laser-Systems-Catalog.pdf

…& Performance · www.Coherent.com · tech.sales@coherent.com
6
Verdi G-Series
Low-Noise, Green Pump Lasers
The Verdi G-Series is a revolutionary green pump laser
that uses a semiconductor chip as the active medium
in place of a conventional laser crystal.This…

COHR RLScatalog 2017revA web.pdf

COHR RLScatalog 2017revA web.pdf

…& Performance · www.Coherent.com · tech.sales@coherent.com
6
Verdi G-Series
Low-Noise, Green Pump Lasers
The Verdi G-Series is a revolutionary green pump laser
that uses a semiconductor chip as the active medium
in place of a conventional laser crystal.This…

Advances in Diode Lasers and OPSLs

Advances in Diode Lasers and OPSLs

…efficient nonlinear
harmonic generation
· Excellent beam and mode quality
· High power stability & low noise
· No "green problem"
· No thermal lensing
· Fiber coupling with high efficiency
· High reliability & lifetime due to
semiconductor design…

SST 2017-09 Laser Marking.pdf

SST 2017-09 Laser Marking.pdf

…substrates
IC substrates or
interposers are
marked during
production with
traceable data
matrix codes.
The thin green
solder resist
layer on top of
the substrate
has to carry the
mark, and care
has to be taken
that the copper