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Barium Borate exists in three major crystalline forms: alpha, beta, and
gamma. The low-temperature beta phase converts into the alpha phase upon
heating to 925 °C. β-BBO differs from α-BBO by the
positions of the barium ions within the crystal. Both phases are
birefringent, however α-BBO has centric symmetry and thus
does not has the same nonlinear properties as β-BBO.α-BBO is a negative uniaxial crystal with a large birefringence over the broad transparent range from 189 nm to 3500 nm.
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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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High temperature phase of α-BBO Crystal (BaB2O4)
is one of the excellent birefringent crystals. It is characterized by
large birefringent coefficient and wide transmission window ranged from
189nm to 3500nm. Due to its high chemical stability and medium hardness,
α-BBO is fabricated easily into many kinds of optical components.The
physical, chemical, thermal and optical properties of α-BBO are similar
to those of β-BBO.
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BBO（Beta-Barium Borate, β-BaB2O4）based Pockels cells operate from approximately 0.2 - 1.65 µm and are not subject to tracking degradation. BBO exhibits low piezoelectric response, good thermal stability, and low absorption. Due to the low piezoelectric coupling coefficients of BBO, BBO Pockels cells function at repetition rates of hundreds of kilohertz.
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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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Beta-Barium Borate (β-BBO) is an excellent nonlinear crystal with combination of a number of unique features: wide transparency region, broad phase-matching range, large nonlinear coefficient, high damage threshold, and excellent optical homogeneity. Therefore, β-BBO provides an attractive solution for various nonlinear optical applications such as OPA, OPCPA, OPO etc.β-BBO also has advantages of large thermal acceptance bandwidth, high damage threshold and small absorption, thus is very suitable for frequency conversion of high peak or average power laser radiation, e.g.
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Beta-Barium Borate (β-BBO) is an excellent nonlinear crystal with combination of a number of unique features: wide transparency region, broad phase-matching range, large nonlinear coefficient, high damage threshold, and excellent optical homogeneity. Therefore, β-BBO provides an attractive solution for various nonlinear optical applications such as OPA, OPCPA, OPO etc. β-BBO also has advantages of large thermal acceptance bandwidth, high damage threshold and small absorption, thus is very suitable for frequency conversion of high peak or average power laser radiation, e.g.
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BBO features good optical transparency from around 200nm to over 2µm, offers a high
resistance to optical damage with power handling >3GW/cm2 for 1ns pulses at 1064nm. It
is possible to use BBO Pockels cells at average power levels of
hundreds of watts and power densities of several kW/cm2. In addition, BBO Q-switches have very
low levels of piezo-electric resonances.
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BBO（Beta-Barium Borate, β-BaB2O4）based Pockels cells operate from approximately 0.2 - 1.65 µm and are not subject to tracking degradation. BBO exhibits low piezoelectric response, good thermal stability, and low absorption. Low
piezoelectric ringing makes this Pockels cell attractive for the control
of high-power and high-pulse repetition rate (hundreds of kilohertz, up to 1MHz) lasers.
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BBO is an effective NLO crystal for the SHG, THG, or FHG of Nd:YAG lasers, and the first-rate NLO crystal for the FHG at 213nm. Conversion efficiencies of more than 70% for SHG, 60% for THG and 50% for 4HG, and 200mw output at 213 nm (5HG) have been obtained through using Wisoptic's BBO, respectively.BBO is also an efficient crystal for the intracavity SHG of excessive energy Nd:YAG lasers. for the intracavity SHG of an acousto-optic Q-switched Nd:YAG laser, greater than 15 w average power at 532 nm generated via an AR-coated BBO crystal produced by Wisoptic.
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Beta-BBO crystal is an important nonlinear optical crystal
with combination of unique optical properties, such as broad transmission and
phase matching ranges, large nonlinear coefficient, high damage
threshold and excellent optical homogeneity. The β-BBO crystal is an efficient material for the second, third and fourth
harmonic generation of Nd:YAG lasers, and the best NLO material for the
fifth harmonic generation at 213 nm.
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LBO (LiB3O5) is an excellent non-linear crystal of Borate-family following BBO. LBO has advantages of good ultraviolet transmittance (210-2300 nm), high laser damage threshold and large effective frequency doubling coefficient (about 3 times of KDP crystal). Therefore LBO is commonly used to produce high power second and third harmonic laser light, especially for ultraviolet lasers.LBO has large band gap and transparency region, high non-linear coupling, good chemical and mechanical properties.
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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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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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RTP possesses a large electro-optic impact for light propagating along either the x or y direction (electric powered along z). It functions right optical transparency from around 400nm to over 4µm. RTP offers a high resistance to optical damage with energy ~1Gw/cm2 for 1ns pulses at 1064nm. It is largely total lack of piezo-electric resonances at 200kHz and probable beyond. The primary distinction between RTP and BBO whilst used for Q-switching pertains to the common power degree at which the Q-switch is capable of be used practically.
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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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A prism, in optics, is a piece of glass or other transparent object surrounded by two planes that intersect
but are not parallel to each other. The most important parameters of a
prism are the angle and material. Prisms are capable to redirect light at a designated angle or adjust the orientation of an image. Therefore prism is useful for in certain spectroscopes, instruments for analyzing light
and for determining the identity and structure of materials that emit or
absorb light. An optical prism’s design determines how light interacts with it.
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Alumina Ceramic Reflectors are designed primarily for use in pumping chambers for many diverse laser
systems, e.g. YAG lasers.
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Ceramic Laser Reflector (Ceramic Laser Cavity) works particularly well in Ruby,
Nd:YAG, or Alexendrite laser pumping chambers and can be a highly cost effective
alternative to metal coated reflectors. Compared to metal reflectors, ceramic units offer higher reflectivity
and therefore enhanced laser power. Surfaces can be sealed and coated
with a solarization-resistant glaze to give high bulk reflectivity.
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Highly doped (50%) Erbium YAG is a well-known laser source for producing 2940nm emission, commonly used in medical (e.g. cosmetic skin resurfacing), and dental (e.g. oral surgery) applications due to the strong water and hydroxapatite absorption at this wavelength.Low doped (< 1%) Erbium YAG hase been studied as an efficient means to generate high power and high energy 1.6 micron 'eye-safe' laser emission thru 2 level resonant pumping schemes.
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Yb:YAG's advantage is a wide pump band and an excellent emission
cross section. It is ideal for diode pumping. The broad absorption band
enables Yb:YAG to maintain uninterrupted pump efficiency across the
typical thermal shift of diode output. High efficiency means a
relatively small dimension Yb:YAG laser crystal will produce high power
output. Based on the YAG host crystal, Yb:YAG can be quickly integrated
into the laser design process.
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Ytterbium Doped Yttrium Aluminum Garnet (Yb:YAG) is more suitable for diode-pumping than the traditional Nd-doped laser crystal. Compared with the commonly used Nd:YAG, Yb:YAG has the following advantages: three to four times lower thermal loading per unit pump power and much larger absorption bandwidth to reduce thermal management requirements for diode lasers, longer upper-laser level lifetime.
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Ytterbium Doped Yttrium Aluminum Garnet (Yb:YAG) is more suitable for diode-pumping than the traditional Nd-doped laser crystal. Compared with the commonly used Nd:YAG, Yb:YAG has the following advantages: three to four times lower thermal loading per unit pump power and much larger absorption bandwidth to reduce thermal management requirements for diode lasers, longer upper-laser level lifetime.
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Wisoptic’s optical mirrors are available for use with light in the UV,
VIS, and IR spectral regions. Optical mirrors with a metallic coating
have high reflectivity over the widest spectral region, whereas mirrors
with a broadband dielectric coating have a narrower spectral range of
operation; the average reflectivity throughout the specified region is
greater than 99%.
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