Optimize Your Fiber Laser Systems with High-Performance Isolators (read more)

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)

Applications:

• Laser sensing system
• Ultrafast laser system
• OCT system
• Laser detection etc

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 center to provide better controlled surface quality, irregularity and focal length deviation. (read more)

CASTECH utilizes the high-quality crystals and optical components for the production of Fiber-Free Space Isolators to deliver great performance. The power is ranging from 300 mW to 200 W. The products are featured with high isolation(35 dB for single-stage series and 50 dB for dual-stage series), low insertion loss, excellent environmental stability and free of thermal lens effect. (read more)

CASTECH offers:

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

PPLN - Periodically Poled LN: The NLO crystal Lithium Niobate is made into a periodically inverted domain structure, called Periodically Poled Lithium Niobate (PPLN), to compensate for phase mismatch caused by dispersion. (read more)

CPA technique is widely used for generation of ultra-short and high energy pulse of lasers. CASTECH’s reflection grating has been successfully applied on pulse compression. (read more)

Applications

• Laser sensing system
• Ultrafast laser system
• OCT system
• Laser detection etc

CASTECH’s high DE reflection grating is ideal for WSS and other applications in the optical communication industry. The high-precision design of grating provides outstanding diffraction efficiency and perfect uniformity.

More info... (read more)

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.
Application in Nd:YAG Lasers:
BBO is an efficient NLO crystal for the second, third... (read more)

Elevate WSS and optical communication with CASTECH's precision gratings (read more)

CASTECH presents a cutting-edge high DE reflection grating, tailored for the optical communication industry. This precision-designed grating offers exceptional diffraction efficiency and unparalleled uniformity, making it an ideal choice for applications like Wavelength Selective Switches (WSS) and more. (read more)

Hollow-core photonic crystal fibers can guide light through air rather than through glass. CASTECH can provide hollow core photonic crystal fiber optic cables with high-reliability. (read more)

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)

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)

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)

Compact, High-Performance 200 MHz Fiber-Coupled AOM for Precision Pulse Picking and Modulation. (read more)

Highly Resistant to Gray-Tracking, Offering a Reliable Solution for Your High-Power Laser Systems (read more)

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)

As an excellent birefringent crystal, YVO4 is widely applied in fiber optic isolators and circulators, interleavers, beam dispalcers and other polarizing optics (refer to Table 1). YVO₄ crystals are widely used in fiber-optic isolators, beam displacers and optical circulators, etc. (read more)

CASTECH's TAP In-Line Isolators offer high-performance optical signal control, with applications in EDFA, DWDM, laser sensing, fiber communication, quantum tech, biophotonics, aerospace, and more. Customizable ratios, exceptional reliability. Ideal for diverse optical systems. (read more)

Applications：

• Laser marking
• Lithography
• Material processsing
• Medical surgery
• Micromachining

Elevate systems with CASTECH Fiber-Free Space Isolators. High isolation, low loss, precision control. Ideal for lasers, sensors, gauges. (read more)

Our high DE reflection and transmission grating is ideal for WSS and other applications in optical communication industry. Generated by our state-of-art projection photolithography, holographic and ion etching technology... (read more)

• Various size of bulk and finished high quality YVO4 crystals up to φ35x50mm3 and φ20x20mm3, respectively;
• Large quantity YVO4 wedges and displacers used for fiber optical isolators and circulators, interleavers, in size of 1.25x1.25x0.5mm3 to 3x3x15mm3 to meet OEM customer’s requirement;
• Quick delivery;
• Very competitive price;<.../li>

• Material from DUV to IR
• Custom dimension and shapes
• Wafer type: Plano or Prism

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)

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's KTP is featured by:

• Large nonlinear optical coefficient;
• Wide angular bandwidth and small walk-off angle;
• Broad temperature and spectral bandwidth;
• High electro-optic coefficient and low dielectric constant;
• Large figure of merit;
• Nonhydroscopic, chemically and mechanically stable. (read more)

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)

Applications:

• Fiber optical sensor system
• Bidirectional signal transmission system
• Dispersion compensation

CASTECH has strong design and testing capabilities to precisely characterize the performance of our optical assemblies. (read more)

CASTECH offers group delay dispersion report by specialized GDD measurement in house. We have a wide range of measure instrument to guarantee high reflectivity, including Cavity-Ring-Down, Varian Cary-5000, Varian Cary-6000, Varian Cary-7000, Perkin Elmer Lambda-950 and Spectrum 100FTIR. Every coating batch is tested to promise high- performance reflectivity values to fit your needs. (read more)

CASTECH offers a large comprehensive selection of optical mirrors for use with light in DUV to IR spectral region, ranging from laser line mirrors, board-band dielectric/metallic mirrors to ultrafast laser mirrors to provide ideal solutions for specialized applications especially at high laser power. (read more)

• 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

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)

Applications: Q-switching, Regenerative amplifier, Pulse picker,read more... (read more)

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)

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)

Description

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

• High quality ,excellent value
• Broaband dielectric coatings
• Hight damage threshrod

CLBO, as one of the few UV nonlinear crystals with cutoff wavelength up to 180 nm, is used for FOHG and FHG of high-power Nd:YAG laser. CASTECH can offer UV AR-coating and sealed housing services. (read more)

Polarizing Beamsplitters divide unpolarized beam into two orthogonal, linearly polarized parts. A wide variety of Polarizing Beamsplitters configurations are offered by CASTECH, (read more)

The achromatic Objective Lense is an infinity corrected lens used for axial achromatic correction. (read more)

The polarization independent isolator consists of three main components, which are birefringent beam displacer (polarizer), Faraday Rotator, half-wave plate. It’s usually used in the fiber laser system and to maintain the stability of optical system effectively. (read more)

Yb:CALGO - Ytterbium Doped Calcium Gadolinium Aluminate

Yb:CALGO is a promising new laser gain material with low quantum defect (1.5%) that apples to ultra-fast pulses. Its thermal conductivity is k=6.7W/m/K, making it suitable for high-power laser use. (read more)

Description

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

• High quality ,excellent value
• Broaband dielectric coatings
• Hight damage threshrod