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Optical Lenses are designed to
focus or diverge light and for imaging or alignment in an optical
system. Optical Lenses, which may consist of a single or multiple
elements, have a variety of applications. Lens forms can be divided into
simple lenses (which include plano-convex lens, plano-concave lens,
double-convex lens, double-concave lens, cylinder lens, drum
lens, spherical lens in different shapes), achromatic lenses compound
lens and multiple types.
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The most notable benefit of aspheric lenses is their ability to correct for spherical aberration,
an optical effect which causes incident light rays to focus at
different points when forming an image, creating a blur. Spherical
aberration is commonly seen in spherical lenses, such as plano-convex or
double-convex lens shapes, but aspheric lenses focus light to a small
point, creating comparatively no blur and improving image quality.
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Optical lenses can be made in many shapes and may be comprised of a
single element or form constituent parts of a multi-element compound
lens system. They are used to focus light and images, produce
magnification, correct optical aberrations and for projection, mainly
controlling the focus or divergence light used in instrumentation,
microscopy and laser applications.
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An aspherical lens features a non-spherical but rotationally symmetric
shape with a curvature radius that changes at various points between the
center and the edge. Although producing this type of lens is difficult,
when manufactured properly, it offers greater functionality than a
comparable spherical lens.Spherical Lenses vs. Aspherical LensesSpherical lenses have a spherical surface and the same radius of
curvature across the entire lens. In contrast, aspherical lenses have a
more complicated surface with a gradually changing curvature from center
to edge.
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A wave plate, also called a phase retarder, is an optical device that changes the polarization state of light by generating an optical path difference (or phase difference) between two mutually orthogonal polarization components. When the incident light passes through wave plates with different types of parameter, the exit light is different, which may be linearly polarized light, elliptically polarized light, circularly polarized light, etc.
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Waveplates (retardation plates or phase shifters) are made from
optical materials with precise thickness such as quartz, calcite or mica, which exhibit birefringence. The velocities of the
extraordinary and ordinary rays through the birefringent materials vary
inversely with their refractive indices. The difference in velocities
gives rise to a phase difference when the two beams recombine.
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Phase retardation plates, or waveplates, are polarizing
optics used to manipulate the polarization state of the transmitting
light without attenuating, deviating, or displacing the light. The
working principle of the plate is to utilize
the birefringence of certain materials which separates the incident
light beam into two beams along two orthogonal optical axes within
the medium. The phase retardation between the two beams of the incident light contributes to changes in the
polarization state.
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Periodically poled lithium niobate (PPLN) crystal and MgO: PPLN are a new kind of nonlinear optical crystal, which can realize high-efficiency frequency conversion such as frequency doubling, sum frequency, and optical parametric oscillation in wave brand from visible to mid-infrared. When doped with 5% MgO, the photodamage threshold and photorefractive threshold of PPLN are greatly increased (compared to that of pure PPLN), and their performance is more stable and suitable for room temperature use.
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HGTR (High Grey Track Resistance) KTP crystal developed by hydrothermal method overcomes the common phenomenon of electrochromism of the flux-grown KTP, thus has many advantages such as high electrical resistivity, low insertion loss, low half-wave voltage, high laser damage threshold, and wide transmission band.
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KTP (KTiOPO4) is one of the most commonly used nonlinear optical materials. For example, it’s regularly used for frequency doubling of Nd:YAG lasers and other Nd-doped lasers, particularly at low or medium-power density. KTP is also widely used as OPO, EOM, optical wave-guide material, and in directional couplers.KTP exhibits a high optical quality, broad transparency range, wide acceptance angle, small walk-off angle, and type I and II non-critical phase-matching (NCPM) in a wide wavelength range.
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Bandpass Filters are used in a variety of industries, including machine
vision,factory automation, security and surveillance, license plate
recognition, medical and life science, agricultural inspection, aerial
imaging, motion analysis, photography and cinematography.WISOPTIC's bandpass filters include mass collection of dielectric-coated
filters, colored glass filters, neutral density filters, spatial
filters, and tunable optical filter based on liquid crystal
technology. Specifically speaking, e.g.
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Optical filters are used to selectively transmit or reject a wavelength or range of wavelengths. Their applications include fluorescence microscopy, spectroscopy, clinical chemistry, machine vision inspection, etc. Optical filters are widely used in light system of life science, imaging, industrial, or defense industries. For example, Bandpass interference filters are designed to transmit a portion of the spectrum, while rejecting all other wavelengths. Notch filters reject a portion of the spectrum, while transmitting all other wavelengths.
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Optical filter is usually a component with a wavelength-dependent transmittance or reflectance. It's used to selectively transmit or reject a wavelength or range of wavelengths. Filters with particularly weak wavelength dependence of the transmittance are called neutral density filters. The general applications of optical filters include fluorescence microscopy, spectroscopy, clinical chemistry, machine vision inspection, etc. Bandpass interference filters are designed to transmit a portion of the spectrum, while rejecting all other wavelengths.
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LN crystals are nonhygroscopic and have low absorption coefficient and insert loss. In addition, LN crystal can operate stably in a wide temperature range, which makes them the main EO crystal applied in military laser systems.LN electro-optic Q-switches are widely
used in Er:YAG, Ho:YAG, Tm:YAG lasers, and are suitable for low-power
Q-switched output, especially in laser ranging. LN Pockels cells can be very compact, and the half-wave voltage can be very low. By doping MgO in LiNbO3, the damage threshold of LN Pockels cells can been increased dramatically.
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LiNbO3 (Lithium Niobate, LN) crystal is a multifunctional material that integrates properties of piezoelectric, ferroelectric, pyroelectric, nonlinear, electro-optical, photoelastic, etc. LiNbO3 has good thermal stability and chemical stability.Among the EO crystals, LN and DKDP are the two primary material that have been practical. DKDP crystals can be easily grown with a high optical homogeneity, which can satisfy the requirement of a large caliber Pockels cell.
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LiNbO3 crystal is a low cost photoelectric material with good mechanical
and physical properties as well as high optical homogeneity. It has
been widely used as frequency doublers for wavelength > 1mm and
optical parametric oscillators (OPOs) pumped at 1064nm as well as
quasi-phase-matched (QPM) devices. With preferable E-O coefficients,
LiNbO3 crystal has become the most commonly used material for Q-switches
and phase modulators, waveguide substrate, and surface acoustic wave
(SAW) wafers, etc.
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High
temperature phase BBO (alpha-BBO, a-BBO) is a negative uniaxial crystal
with a large birefringence over the broad transparent range from 189 nm
to 3500 nm. The physical, chemical, thermal, and optical properties of
alpha-BBO crystal are similar to those of the low temperature phase beta-BBO crystal.
However, there is no second order nonlinear effect in alpha-BBO crystal
due to the centrosymmetry in its crystal structure and thus it has no
use for second order nonlinear optical processes.
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The improved hydrothermal-grown KTP crystal overcomes the common
electrochromism damage of flux-grown KTP. The hydrothermal-grown KTP (HGTR-KTP, or GTR-KTP) has high damage
threshold, large effective electro-optic coefficients and lower
half-wave voltage. KTP EO Q-switches made by HGTR-KTP crystals utilize thermally compensated
double crystal designs. They are mainly used in pulse lasers with narrow pulse width and high repetition frequency.
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The high
damage threshold makes BBO cells more attractive than others in the high
power systems. Like LiNbO3 Pockels cells, BBO Pockels cells work in
transverse mode, which makes the cells very compact, and the half-wave
voltage designable. BBO Pockels cells are also suitable for systems with
high repetition rates.WISOPTIC has been granted of several patents for its technology of BBO Pockels cells. WISOPTIC’s mass products of BBO Pockels cell are gaining worldwide customers’ interest and trust for its high cost performance.
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Pockels Cell Driver for Q-Switching of Flashlamp Pumped LasersThese drivers are designed for Q-switching of nanosecond flashlamp pumped lasers without use of phase retardation plates, for example to drive a DKDP Pockels cell in YAG lasers for aesthetic therapy. High voltage is applied to Pockels cell in order to inhibit oscillation.
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A Pockels cell driver is a high-voltage regulated power supply,
either pulse or continuous, allowing to control a birefringence of an
electro-optical crystal (KTP, KD*P, BBO, etc.) in order to drive the
polarization direction of the light propagating through the crystal.WISOPTIC has developed and produces a variety of Pockels cell drivers
for different applications: from very simple compact devices for
q-switching to precise and powerful fast models for pulse picking,
cavity damping, regenerative amplifier control, etc.
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Basically all Pockels cell drivers are made based on
solid-state electronic technology, using high voltage transistors such
as MOSFETs.
Multiple high voltage transistors may have to be stacked, taking care to
achieve an even distribution of voltage across those.
Instead of using some heavily isolated floating gate drive circuitry for
the different transistors, one may use certain advanced ideas such as
implementing so-called avalanche switch stacks involving avalanche
diodes and/or avalanche bipolar transistors.Device lifetimes can be very long, provided that properly engineered
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HGTR (high anti-grey track) KTP crystal developed by hydrothermal method overcomes the common phenomenon of electrochromism of the flux-grown KTP, thus has many advantages such as high electrical resistivity, low insertion loss, low half-wave voltage, high laser damage threshold, and wide transmission band.KTP Pockels cells made by HGTR-KTP crystal are mainly used in pulse lasers with narrow pulse width and high repetition frequency.
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The EO Q-switch (Pockels cell) is an electro-optic device in which the crystal
produces linear changes in the birefringence of the crystal (in contrast
to the Kerr Effect, which is quadratic with E).
Pockels cells are essential components in various optical devices such
as Q-switches for lasers, free space electro-optical modulators, free
space switches. WISOPTIC use highly deuterated DKDP (KD*P) crystal (D%>99%) to make high quality Q-switches with high laser induced damage threshold.
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