Announcements

CASTECH, Inc. has promoted these products / services:

CASTECH, Inc. - Aspherical Lenses

Aspheric lenses have its advantages in a range of applications where eliminated spherical aberration or (and) single element design is required. CASTECH offers CNC precision-polished aspherical and acylindrical lenses, with or without anti-reflection (AR) coatings. Our CNC polished aspheric lenses are iteratively ground and polished by a software supported computer-controlled processing... (read more)

CASTECH, Inc. - Optical Windows
  • Material from DUV to FIR
  • Custom dimensions and shapes
  • Diameter from 0.5 to 600 mm
  • Clear aperture: Central 90% of diameter
  • Flatness: λ/20@632.8nm ( λ/40 by IBF)
  • Surface quality: 10-5 S/D
  • Parallelism:<3″
  • Standard and custom AR coating options available
  • High laser damage threshold
(read more)
CASTECH, Inc. - Diffraction Gratings for Pulse Compression

CASTECH's reflection grating has been successfully applied on pulse compression, which is created by our unique holographic, ion etching and replication technique. The grating delivers low scattering, high diffraction efficiency and features in extreme competitive pricing as well. (read more)

CASTECH, Inc. - BBO Crystal | Application in Nd:YAG Lasers

Beta-Barium Borate (β-BaB2O4 or BBO), discovered and developed by FIRSM, CAS (Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences), now is manufactured and marketed by CASTECH Inc. The high-quality crystal boule is steadily available from CASTECH. (read more)

CASTECH, Inc. - Birefringent Crystals(YVO4)

The Yttrium Orthovanadate (YVO4) is a positive uniaxial crystal grown with Czochralski method. It has good temperature stability and physical and mechanical properties. It is ideal for optical polarizing components because of its wide transparency range and large birefringence. It is an excellent synthetic substitute for Calcite (CaCO3) and Rutile (TiO2) crystals in many applications inc... (read more)

CASTECH, Inc. - Custom dimension and shapes Aspherical Lenses
  • Material from DUV to IR
  • Custom dimension and shapes
  • Diameter from 5 to 200 mm
  • Clear aperture: Central 90% of diameter
  • Irregularity : λ/10@632.8nm
  • Surface quality: 20-10 S/D
  • Centration: <3′
  • Standard and custom coating options available
  • High laser damage threshold

Aspheric lenses hav... (read more)

CASTECH, Inc. - Diffraction Gratings for Telecommunication
  • Material from DUV to IR
  • Custom dimension and shapes
  • Wafer type: Plano or Prism
(read more)
CASTECH, Inc. - BIBO optical crystal

CASTECH offers:

• Strict quality control;
• Large crystal size up to 10x10x15mm3 ;
• AR-coating, mounts and repolishing services;
• Fast delivery. (read more)

CASTECH, Inc. - Laser Components - TAP In-Line isolators

Product description:

CASTECH supplies TAP isolators which have a power monitoring port, exporting light in constant proportion of the output power for easier detection. It supports various output ratios like 0.1± 0.05%, 1± 0.5%, 2± 0.8%, 5± 1.0% and 10± 2.0%, of course, the ratio can be customized as well.

CASTECH produces TA... (read more)

CASTECH, Inc. - What A Significant Work Aspherical Lenses Can Do

CASTECH offers CNC precision-polished aspherical and acylindrical lenses, with or without anti-reflection (AR) coatings, to enable our customers from prototype to mass production stage with greater freedom and imagination. (read more)

CASTECH, Inc. - Faraday Rotators for Laser sensing system

Applications

  • Laser sensing system
  • Ultrafast laser system
  • OCT system
  • Laser detection etc
(read more)
CASTECH, Inc. - Diffraction Gratings

CPA technique is widely used for generation of ultra-short and high energy pulse of lasers. Grating is one of the most critical components in the pulse stretch and compression system to determine their performance. (read more)

CASTECH, Inc. - optical crystal - Yb:CaGdAlO4

CASTECH’s Yb:CaGdAlO4 is featured by

  • High absorption coefficient @ 979 nm
  • High stimulated emission cross section
  • Low laser threshold
  • Extremely low quantum defect
  • Broad output at 994-1050 nm
  • High slope efficiency with diode pumping (up to 55%)
  • Various Yb-doping concentration
(read more)
CASTECH, Inc. - Optical Mirrors
  • Substrate material from DUV to IR
  • Custom dimensions and shapes
  • Diameter from 5 to 300 mm
  • Clear aperture: Central 90% of diameter
  • Flatness: λ/10@632.8nm
  • Surface quality: 10-5 S/D
  • Parallelism:<3′
  • Partial and high reflectivity optical mirrors are available upon custom request
  • High laser....
(read more)
CASTECH, Inc. - Fiber - Free Space Isolators

Fiber-Free Space Isolators can be divided into two categories according to its output mode: non-expanded-beam isolator and expanded-beam isolator.
The non-expanded-beam isolator consists of birefringent crystal, Faraday rotator, half-wave plate or polarizer and collimator. It's usually used in the fiber laser system to maintain the stability of optical system effectively.
The... (read more)

CASTECH, Inc. - Free Space Isolators for Laser sensing system

Applications:Laser precision machining; Laser sensing system; Ultrafast laser system; OCT system; Laser detection etc (read more)

CASTECH, Inc. - KTP Crystal-Large nonlinear optical coefficient

Potassium Titanyl Phosphate (KTiOPO4 or KTP) is widely used in both commercial and military lasers including laboratory and medical systems, range-finders, lidar, optical communication and industrial systems. (read more)

CASTECH, Inc. - BBO Pockels Cells

Pockels cells alter the polarization state of incident light when applying the voltage on electro-optic crystal. When working with polarizers, these cells can function as optical switches or laser Q-switches. BBO Pockels cells is based on the transverse Pockels effect. The voltage could be reduced by changing the ratio of BBO's width to length.

Due to the low piezoelectric respons... (read more)

CASTECH, Inc. - Nd:YVO4

Nd:YVO4 is the most efficient laser host crystal for diode pumping among the current commercial laser crystals, especially, for low to middle power density. This is mainly for its absorption and emission features surpassing Nd:YAG. (read more)

CASTECH, Inc. - BBO Crystal

Beta-Barium Borate (β-BaB2O4 or BBO), discovered and developed by FIRSM, CAS (Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences), now is manufactured and marketed by CASTECH Inc. The high-quality crystal boule is steadily available from CASTECH, who holds specialized proprietary techniques (flux-method) of the BBO crystal growth. (read more)

CASTECH, Inc. - Nd:YAG

Nd:YAG is the earliest and most famous laser host crystal. Since it combines great advantages in many basic properties, Nd:YAG is the ubiquitous presence for near-infrared solid-state lasers and their frequency-doubler, tripler, and higher order multiplier. (read more)

CASTECH, Inc. - LBO Crystal

Lithium Triborate (LiB3O5 or LBO) is an excellent nonlinear optical crystal discovered and developed by FIRSM, CASTECH Inc. has the exclusive rights to produce, manufacture and market the patented LBO crystal and its NLO devices. The patent number is 4,826,283 in USA, 2023845 in Japan and 88,102,084.2 in China. (read more)

CASTECH, Inc. - Adjustable Laser Beam Expanders

Beam expander is an optical component built to enlarge the diameter of collimated input beam and reduce the beam divergence. It’s primarily applied in applications of Laser scanning, laser cutting, interferometry and remote sensing. A typical Galilean type beam expander consists of one negative lens and one positive lens. (read more)

CASTECH, Inc. - Gires-Tournois Mirrors
  • Material: Fused Silica or N-BK7
  • Custom reflectivity and GDD
  • Rs & Rp >99.8% @design wavelength
  • GDD from -250 to -600 fs2
  • High damage threshold
(read more)
CASTECH, Inc. - High quality Broadband Dielectric Coatings

Description

CASTECH offers two standard dielectric broadband coatings . Other coatings are available upon request.

  • High quality ,excellent value
  • Broaband dielectric coatings
  • Hight damage threshrod
(read more)
CASTECH, Inc. - Birefringent Crystals-YVO4

The Yttrium Orthovanadate (YVO4) is a positive uniaxial crystal grown with Czochralski method. (read more)

CASTECH, Inc. - KTA Crystal

Potassium Titanyle Arsenate (KTiOAsO4), or KTA crystal, is an excellent nonlinear optical crystal for Optical Parametric Oscillation (OPO) application. It has better non-linear optical and electro-optical coefficients, significantly reduced absorption in the 2.0-5.0 µm region, broad angular and temperature bandwidth, low dielectric constants. And its low ionic conductivities result... (read more)

CASTECH, Inc. - High Reflectivity Mirrors

CASTECH designs and fabricates high reflectivity mirrors with high laser damage threshold for most demanding laser applications. (read more)

CASTECH, Inc. - Optical Assembly

Metrology:CASTECH has strong testing capabilities to precisely characterize the performance of our optical assemblies. A variety of advanced metrology systems are applied to guarantee the precise measurements of optical, mechanical, and reliability properties. (read more)

CASTECH, Inc. -  Laser Line Dielectric Coatings

CASTECH offers two standard dielectric broadband coatings . Other coatings are available upon request.

  • High quality ,excellent value
  • Broaband dielectric coatings
  • Hight damage threshrod
(read more)
CASTECH, Inc. - Er,Cr:YSGG

Advantages of Er,Cr:YSGG:

  • Lowest threshold and highest slope efficiency of common Erbium doped crystals;
  • High conversion efficiency;
  • Operates CW, free-running or Q-switched;
  • High optical quality;
  • The intrinsic crystal disorder increases pump line widths and tenability;
  • Can be flash lamp pumped via Cr bands or diode p...
(read more)
CASTECH, Inc. - Nd:YLF

CASTECH grows Nd:YLF crystals using Czochralski method. The use of high quality starting materials for crystal growth, whole boule interferometry, and precise inspection of scattering particle in crystal using He-Ne laser assures that each crystal will perform well. (read more)

CASTECH, Inc. - RTP Crystal

RTP (Rubidium Titanyle Phosphate – RbTiOPO4) is an isomorph of KTP crystal which is used in nonlinear and Electro-Optical applications. It has advantages of high damage threshold (about 1.8 times of KTP), high resistivity, high repetition rate, no hygroscopic and no induced piezo-electric effect with electrical signals up to 60 kHz. Its transmission range is 350nm to 4500nm. (read more)

CASTECH, Inc. - LBO Crystal

Lithium Triborate (LiB3O5 or LBO) is an excellent nonlinear optical crystal discovered and developed by FIRSM, CAS (Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences). CASTECH Inc. has the exclusive rights to produce, manufacture and market the patented LBO crystal and its NLO devices. The patent number is 4,826,283 in USA, 2023845 in Japan and 88,102,0... (read more)

CASTECH, Inc. - Optical Circulator

Applications:

  • Fiber optical sensor system
  • Bidirectional signal transmission system
  • Dispersion compensation
(read more)
CASTECH, Inc. - Gratings

High Efficiency Reflection Grating, 1200 line/mm for 1520nm-1570nm (read more)

CASTECH, Inc. - Acousto-Optic Modulators

Acousto-optic modulators (AOM) can be used like a shutter (cycling light on and off at a set frequency), or as a variable attenuator (controlling the intensity of transmitted light dynamically). This product only presents 1st order diffracted light under the interaction of Bragg diffraction. (read more)

CASTECH, Inc. - BBO Pockels Cells

Pockels cells alter the polarization state of incident light when applying the voltage on electro-optic crystal. When working with polarizers, these cells can function as optical switches or laser Q-switches. BBO Pockels cells is based on the transverse Pockels effect. The voltage could be reduced by changing the ratio of BBO's width to length. (read more)

CASTECH, Inc. - Diffusion Bonded Crystal

Diffusion Bonded Crystals consist of one laser crystal and one or two undoped material. They are combined by optical contact method and further bonded under high temperature. Diffusion Bonded Crystal helps to decrease thermal lensing effect considerably.

CASTECH can supply 3 kinds of Diffusion Bonded Crystals: YVO4+Nd:YVO4+YVO4,YAG+ Nd:YAG+YAG和Cr:YAG+Nd... (read more)

CASTECH, Inc. - Optical Crystals-YVO4

The Yttrium Orthovanadate (YVO4) is a positive uniaxial crystal grown with Czochralski method. It has good temperature stability and physical and mechanical properties. It is ideal for optical polarizing components because of its wide transparency range and large birefringence. It is an excellent synthetic substitute for Calcite (CaCO3) and Rutile (TiO2) crystals in many applications...... (read more)

CASTECH, Inc. - Acousto-Optic Q-Switches

CASTECH's AO Q-Switch is industrial grade product and it can meet the different needs of the customer. It has many advantages, such as compact, high damage threshold and high efficiency. It is widely used in material processing and scientific. In addition, it also can be customized to the parameters according to customer demand. (read more)

CASTECH, Inc. - Faraday Rotators

Applications:

  • Laser sensing system
  • Ultrafast laser system
  • OCT system
  • Laser detection etc
(read more)
CASTECH, Inc. - Faraday Rotators with 100W of Power Handling

Applications:

  • Laser sensing system
  • Ultrafast laser system
  • OCT system
  • Laser detection etc
(read more)
CASTECH, Inc. - Broadband Low GDD Ultrafast Mirrors

Features:

  • Material: Fused Silica or N-BK7
  • Custom reflectivity and GDD
  • Dielectric broadband coatings
  • High damage threshold
(read more)
CASTECH, Inc. - Free Space Isolators

The polarization dependent isolator, or Faraday isolator consists of three major parts which are input polarizer (polarized vertically), Faraday Rotator, and output polarizer (aligned at 45°relative to the input polarizer). (read more)

CASTECH, Inc. - Prisms

Optical Prisms are used to redirect light at a designated angle. Optical Prisms are ideal for ray deviation, or for adjusting the orientation of an image. An Optical Prism’s design determines how light interacts with it. When light enters an Optical Prism, it either reflects off an individual surface or several surfaces before exiting, or is refracted as it travels through the subs... (read more)

CASTECH, Inc. - High quality Broadband Dielectric Coatings

Description

CASTECH offers two standard dielectric broadband coatings . Other coatings are available upon request.

  • High quality ,excellent value
  • Broaband dielectric coatings
  • Hight damage threshrod
(read more)