Characteristics of the Graded Reflectivity Mirror
by VIGITEK MEDICAL VIGITEK MEDICAL LASER CONSULTANTSThe
graded reflectivity mirror also known as the variable reflectivity mirror,
Gaussian mirror, or super-Gaussian mirror, is a unique mirror whose
reflectivity at a specific wavelength gradually varies depending on the
position on the mirror's surface. Super-Gaussian resonators, which are
currently the most popular, are given particular focus.
In
an unstable resonator, the Graded
reflectivity mirror offers greater modal discrimination, favoring
oscillation of the fundamental mode over higher-order modes. Additionally, it
enhances the output beam's optical quality, particularly at low magnifications.
When used with high-intensity lasers, the tapered reflectivity profile also
causes a reduction in ripples in the field profile, lowering the danger of
optical damage. It is a premier technology developer and a centre of excellence
for industrial applications of optics and photonics. Major laser manufacturers
and well-known laboratories now frequently employ s Graded Reflectivity Mirrors
(GRMs), which are a clear substrate with an anti-reflection coating on which
profiled dielectric layers are formed using a specialized vacuum method. It is
a high-damage threshold lossless dielectric component.
Applications
for Graded Reflectivity Mirrors
Coupling
of output
A
laser resonator's output coupler Cth yag could
be the GRM. The Graded Reflectivity Mirrors functions as a soft aperture in a
stable configuration with the extra bonus that the induced loss also produces a
usable laser output, enhancing the output beam's discriminating and pointing
stability. The Graded Reflectivity Mirrors greatest utility, however, is as an
unstable resonator's output coupler, which ensures fundamental mode oscillation
but prevents any hard-edge-induced rippling of the field transverse profile.
Beam
shaping
A
Graded Reflectivity Mirror can be used to change the form of an existing beam,
such as from Gaussian to Super-Gaussian or vice versa. You can do this by
reflection or transmission.
Features
· developed
specifically for each type of laser. Using a multi-layer architecture, from the
UV to the infrared, a high reflectivity GRM for use with lower-gain lasers is
produced.
· tunable
lasers with a bandwidth of up to 80 nm using wideband GRMs.
· Graded
Reflectivity Mirrors profiles are available in both circles and rectangles.
There is a service for designing laser resonators.
High-damagethreshold
For
many laser systems, the graded reflectivity mirror unstable resonator has
emerged as the preferred option. It offers a fundamental mode with a large size
while minimizing the negative diffraction effects present in hard-edge unstable
resonators. Awise selection of the Graded Reflectivity Mirror’s reflectivity
profile, also permits some control over the output beam's near-field profile.
This increased design freedom appears to the potential user to be more
complicated. This goes through the inner workings of these resonators so that
you can see the tradeoffs that went into their creation. It has geometrical and
diffractive contributions to the mode definitions as well as how amplification
shapes beams.
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