Optical Assembly

Optical Design and Engineering

II-VI strives to provide innovative solutions for our customers’ projects and products. Our engineering teams work closely with our customers on mechanical, optical, and coating design, including optical and mechanical materials selection. Our experienced engineering teams utilize various design and analysis tools to provide our customers with the assurance that their products will exceed their requirements. Design tools include:

  • Optical path analysis: Zemax, CODE V, OSLO
  • Mechanical structure design: SOLIDWORKS, Pro/ENGINEER 3D modeling, PTC Creo 3D modeling, PTC Creo mechanism design, PTC Mathcad, LensMechanix
  • Thermal analysis and mechanical alignment simulations: PTC Creo thermal/structural simulator, Ansys thermal/structural/CFD simulator
  • Electronic and firmware design: CST, Visual Studio, Altium Designer

Early in the design process, prototypes are available with quick turnaround times to validate design concepts. We then leverage our mature processes and testing capabilities to quickly transfer products to manufacturing in order to cost-effectively produce them at scale. II-VI follows its new product introduction (NPI) process with stage gates:

  • Stage 1: Customer requirements review
  • Stage 2: Alpha build and preliminary design review
  • Stage 3: Beta builds and design verification review
  • Stage 4: Pilot production and critical design validation review
  • Stage 5: Volume production ramp and transfer to manufacturing review

Optics and Materials Finish

II-VI produces a wide range of crystals in-house, including calcium fluoride, diamond, sapphire, zinc selenide, and zinc sulfide, to name a few. II-VI’s skilled technicians use computer numerical control (CNC) equipment to perform double-sided, conventional-spindle, or cylinder high-speed polishing. II-VI’s capabilities include state-of-the-art magnetorheological finishing (MRF) that provides even finer finish quality. The results are high-quality optics produced out of an extensive range of crystal materials, yielding a broad portfolio of products that include windows, lenses, prisms, modulators, waveplates, gratings, mirrors, beamsplitters, and cylinders.

Optical Assembly

II-VI leverages advanced processes such as diffusion bonding and seam sealing to produce highly reliable multi-optical element and optomechanical assemblies. For example, II-VI uses diffusion bonding to produce our polarization beamsplitter cubes that are designed into many commercially successful high-power laser systems. Other assemblies include customized lens solutions such as objective lenses, tube lenses, and telecentric lenses, as well as diffraction-limited optics with high numerical aperture and wide field of view.

II-VI can further integrate its portfolio of lasers, optics, and thermoelectrics with electronics and software to achieve intelligent precision systems for a wide range of applications such as in industrial, automotive, and life sciences. For example, optical systems can include illumination optics, imaging optics, spectral optics, autofocus systems, detection systems, and other mechanical and electronic systems. II-VI is certified to ISO 13485 for FDA-approved medical assemblies at U.S., Vietnam, and China locations.


II-VI applies its extensive testing capabilities to precisely characterize the performance of optics and optical assemblies and to test for quality and reliability. With its dedicated metrology team, II-VI operates test and measurement labs with a wide array of advanced tools for optical, mechanical, and reliability measurements.

Equipment for Optical Measurements

  • Coating spectral analysis to OD 6: Cary 7000, Cary 5000, Lambda 900
  • Laser-induced damage threshold (LDT) with photothermal common-path interferometry (PCI)
  • Interferometry: ZYGO GPI, LUPHOScan
  • Surface roughness: ZYGO NewView, atomic force microscopy (AFM)
  • Angle precision: Trioptics PrismMaster, 0.5” Anglemaster
  • Centering: Trioptics Radius, OptiCentric
  • Modulation transfer function (MTF): Optikos, OpTest VIR

Equipment for Mechanical Measurements

  • CNC video measurement system: Nikon
  • Measurement microscope: KEYENCE VHX-2000

Equipment for Reliability Testing

  • Low- and high-temperature storage
  • Temperature cycling
  • Temperature shock
  • Humidity
  • Salt spray
  • Drop and shake
  • Shear force


Special facilities, manufacturing, procedures, and technician training programs are essential to the repeatability and precision required in optical and electro-optical components and device assembly. Around the globe, II-VI’s various optics assembly and mounting stages are performed in Class 10,000, Class 1,000, and Class 100 cleanrooms.

Contact us to learn more.