Strontium Titanate (SrTiO3) Crystals and Substrates

Strontium Titanate or SrTiO3 single crystal provides a good lattice match to most materials with Perovskite structure. It is an excellent substrate for epitaxial growth of HTS and many oxide thin films. Its lattice constant (3.905Å) fits the common high Tc superconductive material YBCO (3.88 Å) very well. It has twin-less crystal structure and very good physical and mechanical properties for film growth. It is suitable for various high Tc films such as YBCO, Bi-system, La-system and others. SrTiO3 is an excellent and wide applied High Tc superconductive single crystalline substrate.

SrTiO3 single crystal has also been used widely for special optical windows and as high quality sputtering target. It is also suitable for different film growth technologies such as Magnet Sputtering, Pulsed Laser Deposition (PLD), Vapourization, MOCVD, CVD, and laser MBE etc. Films made by these materials and technologies on SrTiO3 substrate have excellent performance, for instance Tc>90K, Jc> = 106A/cm2.

Specifications

Orientations

<100>, <110>, <111>

Orientation Tolerance

±0.5°

Standard Size (mm)

Ф50.8,Ф25.4, 20×20, 15×15,10×10,10×5,10x3mm

Thickness

0.5 mm and 1.0 mm

Dimensional Tolerance

±0.1mm or ±0.05mm

Grown Boule

55 mm dia. x 50-80 mm length

Surface Quality

20/10 S/D

Flatness

1/4 Lambda @633nm for thickness less than 2mm

Parallelism

30 arc sec.

Perpendicularity

5 arc minutes

Wavefront Distortion

<1/4 Lambda @ 633nm

Micro Roughness (5μmx5μm)

Ra:<1Å

Wafers and Substrates >> Substrate for HTSC Film Growth

Sapphire Prisms

Sapphire Prisms is an eminent provider of Corner Cube Retroreflector, right angle prism & optical beam splitter to our clients. These are used to reflect light beam back to the direction that it comes from. Find Variety Hollow Retroreflector from Corner Cube Retroreflector, Prisms Suppliers Located in China.

We offers many kinds of high precision prisms, i.,e, right angle prisms, corner cubes, penta prisms, dove prisms, roof prisms, rhomboid prisms or other irregular shape.

Many types of prisms each having a particular geometry to achieve the reflections necessary to perform a specific imaging task. Reflecting prisms may invert, rotate, deviate or displace a beam. Dispersing prisms produce spectral separation for spectroscopic tuning a laser output.

Attribute Specification
Length(mm) 1.00~250.00
Width(mm) 1.00~150.00
Height(mm) 1.00~150.00
Clear Aperture >95%
Parallelism 5’
Surface Quality 80/50~10/5
Flatness (per 25mm@633nm) 1L~L/4@any 25.4mm area
Bevel (face width x 45°) <0.25mm

 

MgO:PPLN+Nd:YVO4 Modules for 100-400mW 532nm Laser Generations

MgO:PPLN crystals are used as the frequency conversion element, which converts 1064nm laser to 532nm laser, the 1064nm laser is generated from Nd:YVO4 crystals pumped by 808nm LD, the PPLN crystals and Nd:YVO4 crystals are integrated and assembled with the copper heat-sink. The coating on the input surface and output surface form a laser cavity automatically, no mirrors are needed and the modules are compact in size with the output power of 100mW to 400mW. It is alignment-free element, easy to be integrated to your laser system.

Features

  • Low cost
  • High output power and high efficiency
  • Compact and small in size
  • No mirrors and alignment-free
  • Easy to be integrated into your system

 

Specifications
Module Length 7.0mm
Module Width 4.5mm
Module Thickness 2.0mm
Input Surface Coating HT@808nm+ HR@1064nm+HR@532nm
Output Surface Coating HR@1064nm+ HT@532nm;
Optical to Optical Efficiency ³20%
Operation Temperature 20~40°C
Temperature Tolerance > 25°C

Scintillation Crystals and its General Characteristics

Light output (LO) is the coefficient of conversion of ionizing radiation into light energy. Having the highest LO, NaI(Tl) crystal is the most popular scintillation material. Therefore, LO of NaI(Tl) is taken to be 100%. Light output of other scintillators is determined relative to that of NaI(Tl) (%). LO (Photon/MeV) is the number of visible photons produced in the bulk of scintillator under gamma radiation.
Scintillation Decay time is the time required for scintillation emission to decrease to e-1 of its maximum.
Energy resolution is the full width of distribution, measured at half of its maximum (FWHM), divided by the number of peak channel, and multiplied by 100. Usually Energy resolution is determined by using a 137Cs source. Energy resolution shows the ability of a detector to distinguish gamma-sources with slightly different energies, which is of great importance for gamma-spectroscopy.
Emission spectrum is the relative number of photons emitted by scintillator as a function of wavelength.The intensity maximum corresponds to the Imax wavelength shown in the table. For coefficient detection of emitted photons, the maximum of PMT quantum efficiency should coincide with Imax.
Background is a quantity determined as a number of luminescent pulses emitted by radioactive substance within 1 second in the bulk of the scintillator with the weight of 1 kg.
Most scintillation crystals reveal a number of luminescent components. The main component corresponds to Decay time, however less intense and slower ones also exist. Commonly, the strength of these components is estimated by using the intensity of a scintillator’s glow, measured at specified time after the Decay time. Afterglow is the ratio of the intensity measured at this specified time (usually, after 6 ms) to the intensity of the main component measured at Decay time.

Complex oxide crystals Gadolinium Silicate doped with Cerium (Gd2SiO5(Ce) or GSO), BGO, CWO and PWO have a number of advantages over alkali halide crystals: high effective atomic number, high density, good energy resolution in the energy region over 5 MeV, low afterglow, and non-hygroscopicity. Due to these features, detectors with oxide crystals are fail-safer, have no need of hermetization, and have mass and volume several times less than Alkali Halide analogues at the same detection efficiency. Yet oxide scintillators are characterized by lower light output and somewhat lower energy resolution at energies less than 5 MeV.
Bismuth Germanate (Bi4Ge3012 or BGO) is one of the most widely used scintillation materials of the oxide type. It has high atomic number and density values. Detectors based on BGO have volume 10 – 4 times and mass 5 – 7 times less than those with Alkali Halide scintillators. BGO is mechanically strong enough, rugged, non-hygroscopic, and has no cleavage .BGO has an extreme high density of 7.13 g /cm3 and has a high Z value which makes these crystals very suitable for the detection of natural radioactivity (U, Th, K), for high energy physics applications (high photofraction) or in compact Compton suppression spectrometers.

BGO detectors are characterized by high energy resolution in the energy range 5 – 20 MeV, a relatively short decay time; its parameters remain stable up to the doses of 5 x 104 Gy; large-size single crystals are possible to obtain. Due to these features, BGO crystals are used in high-energy physics (scintillators for electromagnetic calorimeters and detecting assemblies of accelerators), spectrometry and radiometry of gamma-radiation, positron tomography
Cadmium Tungstate (CdWO4 or CWO) has high density and atomic number values. Therefore, for CWO, the light output is 2.5 – 3 times higher than that of Bismuth Germanate. Due to low intrinsic background and afterglow and to rather high light output of CWO, the most suitable areas of its application are spectrometry and radiometry of radionuclides in extra-low activities. CWO is the most widely used scintillator for computer tomography. A rather great decay time value (3 – 5 Cls) is a significant feature of CWO which restricts the possibilities of its application in many cases.
Lead Tungstate (PbWO4 or PWO) is a heavy (density = 8.28 g/cm3, Z = 73) and fast (decay time = 3 – 5 ns) scintillation material. It has the least radiation length and Moliere radius values (0.9 and 2.19, respectively) among all known scintillators. Radiation damage appears at doses exceeding 105 Gy. Yet the light output of PWO is as low as about 1% of Csl(TI), so that the material can be used in high-energy physics only.

Germanium(Ge) Windows for thermal imaging

Germanium(Ge) Windows for thermal imaging

  • Wide wavelength range of 2-14 μm
  • Various types of coating available

Germanium windows are ideal for IR applications with its broad transmission range and opacity in the visible portion of the spectrum. Germanium is commonly used in IR imaging systems typically operating in the 2 µm to 14 µm spectral range, covers the LWIR (8-12μm) and MWIR (3-5μm) thermal imaging wavelength range. Germanium can be AR coated with Diamond producing an extremely tough front optic. Germanium is more rugged than other IR materials, but caution should be taken for high temperature applications where the material will become opaque in the IR realm as the temperature rises.

Features

  • Diameter range: ~ 300mm;
  • Various types of coating:

AR/AR@7-14um;
DLC (diamond or hard carbon coating)/AR@7-14um;
BBAR/BBAR@3-12um;
Customized coating;

Specifications
Materials Optical grade germanium single crystals
Aperture >90%
Dimension Tolerance +0.0/-0.2mm
Thickness Tolerance +/-0.2mm
Surface Quality 80/50 S/D
Parallelism 1 arc minute
Chamfer 0.3-0.5mmx45degree
Coating AR/AR@7-14μm
DLC/AR@7-14μm
BBAR/BBAR@3-12μm
See the curves below

CO2 LASER LENSES PROMOTE ENGRAVING & MARKING

CO2 lenses for precision engraving and marking lasers that are shipped from stock

CO2 Precision Marking Lenses feature coatings with < 0.2% total absorption values to keep them cooler and are capable of maintaining sharper cuts with fewer passes. Ideally suited for most popular engraving and marking lasers, these OEM quality optics are offered in 0.5” to 1.5” sizes with focal lengths from 1” to 25” in 0.5” increments.

CO2 LASER FOCUSING LENSES COATINGS PROTECT

A new line of ZnSe focusing lenses for high powered lasers up to 4 kW that can be supplied with various focal lengths and coatings has been introduced.
ZnSe Focusing Lenses are available with a proprietary Cool-CutTM coating which absorbs < 0.15% of laser energy to protect against heat damage or with standard A/R coatings providing < 0.2% total absorption. Featuring focal lengths from 3” to 10” in 0.5” increments to match specific steel cutting applications, they can be supplied plain or mounted.

Offered in 1” to 2” O.D. sizes with thicknesses ranging from 0.250” to 0.380”, ZnSe Focusing Lenses are optimized for 10.6 microns and come in plano-convex and -meniscus configurations. Suited for OEMs and field-replacement by users, these CO2 lenses are ideally suited for use in steel cutting lasers ranging from 1 to 4 kW.

FROM:Laser Research Optics

Barium Fluoride (BaF2) Windows

  • Wide wavelength range of 0.2-11 μm
  • Excellent as the sercurity inspection windows

Barium Fluoride is often suitable for applications in the passive IR band (8 to 14 μm) and is often used as a viewport window for thermal imaging inspection application in electric power facilities and petroleum indutries. For an equivalent thickness the transmission extends approximately 1 micron further into the IR than Calcium Fluoride. Hangzhou Shalom EO also provided the BaF2 windows with the protective coatings.

SPECIFICATIONS

Specifications
Materials IR grade Barium fluoride crystals
Diameter Range ~ 200mm
Aperture >90%
Dimension tolerance +0.0/-0.2mm
Thickness tolerance +/-0.2mm
Surface Quality 80/50 S/D
Parallelism 1 arc minute
Chamfer 0.3-0.5mmx45degree
Coating Optional protective coating

SP1105 NaI(Tl) scintillation probe

SP1105(3″x3″ NaI(Tl) with PMT)

The SP1105 NaI(Tl) scintillation probe is a hermetically sealed assembly, it consists a high resolution diameter 75mm x 75mm length NaI(Tl) crystal, a diameter 3 inch photomultiplier tube, an internal magnetic light shield, an aluminum housing and a 14 pin connector.

Modules or types

Specification of SP1105(3”x3” NaI(Tl) scintillators with PMT)

25℃

SP1105(3”x3” NaI(Tl) scintillators with PMT) Value Unit
Scintillator Scintillation Crystal NaI(Tl) Crystal
Dia.75×75 mm
Encapsulation Aluminum Housing with Optical Window
Photomultiplier Tube Brand Hamamatsu
Model Number CR119/CR160
Performance Energy Resolution ≤7.5%@662KeV(Cs-137)
Operating Environment Temperature -30~+50
High Voltage 400~1000 V

Glan-Laser Calcite Polarizers

Features
Extinction Ratio for Output Beam: 100 000:1 (See Diagram in Lower Right for Details)
Designed for High-Energy Lasers (see the Specs Tab for Damage Thresholds)
Available Uncoated or with One of Four Broadband AR Coatings
Uncoated: 350 nm – 2.3 µm Wavelength Range
350 – 700 nm Broadband AR Coating
650 – 1050 nm Broadband AR Coating
1050 – 1700 nm Broadband AR Coating
1064 nm V Coating
Mounted with Ø5 mm, Ø10 mm, or Ø15 mm Clear Aperture or Unmounted
with Ø10 mm Clear Aperture
20-10 Scratch-Dig Surface Quality on Input and Exit Faces (80-50 on Side Ports)
Fabricated from Highest Grade, Laser-Quality Natural Calcite (Low Scatter)
Glan-Taylor Design (Air-Spaced Birefringent Crystal Prisms)
Select Polarizers Available Unmounted from Stock

The Glan-Laser Calcite Polarizer is a Glan-Taylor Calcite Polarizer that is specifically designed to deal with high-energy laser light. These polarizers are manufactured from select portions of the calcite crystal that must pass a laser scattering sensitivity test. Like our Glan-Taylor polarizers, these polarizers are ideal for applications requiring extremely high polarization purity (100,000:1) and high damage thresholds. A significant amount of reflected light escapes the polarizers through the side port, including all of the ordinary ray and some of the extraordinary ray. As such, the escape beam is not fully polarized, and only the transmitted extraordinary ray should be used for applications that require a high-quality, polarized beam.

The input and output faces of these polarizers are polished to a laser quality 20-10 scratch-dig surface finish to minimize scattering of the transmitted extraordinary polarization component of the incident laser beam or light field. The ordinary polarization component is reflected and exits the polarizer at a 68° angle (wavelength dependent) through one of the two uncoated side ports, which are provided to allow bidirectional use of the polarizer. The escape ray is not fully polarized and the side escape ports have a lower surface quality of 80-50 scratch-dig.

Uncoated calcite has a broad wavelength range (350 nm – 2.3 μm) and these polarizers are available with AR coatings over four wavelength ranges: 350 – 700 nm, 650 – 1050 nm, 1050 – 1700 nm, or 1064 nm. Only the input and output faces of the polarizer are AR coated; the exit and gap faces of the prisms are not coated. This design allows these polarizers to have high extinction ratios at the expense of lower overall transmission.

Our pre-mounted polarizers can be mounted inside our Polarizing Prism Mounts for compatibility with our SM05 (0.535″-40) or SM1 (1.035″-40) threads. The SM05PM5 provides SM05 compatibility for pre-mounted polarizers with Ø5 mm clear apertures, while the SM1PM10 and SM1PM15 provide SM1 compatibility for polarizers with Ø10 mm or Ø15 mm clear apertures, respectively.

Hangzhou Shalom EO is a leading supplier of crystals, optics, OEM components products, a wide range of the products are offered:
• Crystals, optics and components for laser systems and applications;
• IR lenses, windows and optics for thermal imaging cameras and applications;
• Scintillation crystals and components for X-ray, nuclear ray detection;
SAW crystals and wafers, Sapphire and other crystal and optics products for semiconductor, industrial, medical, scientific and research applications