Quality & Testing

II-VI Optical Systems is committed to producing the highest quality products for our customers. Our goal is to ensure customer expectations are met or exceeded in everything we do, every day, in every element of our business.

Quality Management System

II-VI Optical Systems is registered in quality standards AS9100C and ISO9001:2008 in addition to Medical Device standard ISO 13485 through SAI Global. II-VI Optical Systems’ compliance to ISO 9001:2008 requirements helps to ensure that customers will consistently receive the highest quality products.

Testing/Inspection

Testing and inspection is conducted at every phase of the production process to ensure full compliance with customer specifications.

II-VI Optical Systems' products are frequently tested under the environmental conditions in which they will be used. This includes humidity, temperature, rain and sand erosion, salt fog, salt water submersion, shock, and vibration testing.

Our testing capabilities and equipment include visible and IR interferometers to measure surface form and/or transmitted wavefront; a white light interferometer to measure surface roughness (non-contact); visible and IR spectrophotometers to measure optical transmission and reflectivity; a Dektac surface profiler to measure coating thickness; various environmental test chambers (humidity, temperature, and salt spray/fog); a Form Talysurf profilometer; holographic measuring capability for diamond turned aspheric surfaces; and a coordinate measurement machine (CMM).

Strategy

  • Provide quality through planning, control, improvement and shared experience
  • Focus on rigorous, unrelenting discipline throughout the entire 
    engineering process
  • Emphasize total customer satisfaction
  • Develop common initiatives, and drive for continuous improvement
  • Optimize supplier and product quality through early development participation
  • Eliminate defects through process control, product robustness, operator involvement and error prevention

Values and Beliefs

  • Total customer satisfaction
  • Outstanding customer service
  • Innovation, quality and value
  • Creativity and teamwork
  • Proactive involvement by all team members

Tests


Laser Damage Test Bench

For evaluation of the laser durability of materials and thin films, II-VI Optical Systems uses its own designed and operated laser damage test bench. The bench employs a 20Hz laser system operating in a nanosecond pulse regime, with the central wavelength being at 1064nm. The beam delivery system has a wide range of tuning capability with fluence levels exceeding material cohesion strength. This allows II-VI Optical Systems to derive data in accordance with ISO 21254 standard for both laser damage threshold and laser damage certification.

Photo-thermal Common-path Interferometer (PCI)

II-VI Optical Systems owns a dual-configuration PCI system. The dual-configuration means that the system can be used for absorption evaluation with the angle between the probe (632.8nm) and the pump (1064nm) beams being chosen between two preset values. The two angles provide the capability for absorption scanning of optics /crystals having different cross-section-to-length aspect ratios. The system is used for production and R&D evaluation of thermal effects of absorption in glasses, crystals, and thin films. 

Reflectance and Transmittance Test Bench

The bench developed at II-VI Optical Systems is used for the laser evaluation of reflective and transmissive characteristics of the part under test. The laser sources (currently available lines are 594nm, 632.8nm, 808nm, 1064nm), the optics, and the mounting hardware have sufficient adjustment flexibility (positional and functional) to permit the operator to evaluate spectral performance of the parts under test against the coating specifications listed on the relevant documentation (e.g. on a customer print or a II-VI Optical Systems print). This includes the capability for varying the angles of incidence. With minor or no modifications, the bench can be (is) used for evaluation of optical density and extinction.

Ringdown Cavity Lossmeter

Measurements are performed using a dual-wavelength LossPro system. The system employs the so-called cavity ringdown technique (CRD). CRD is a known spectroscopic technique for sensitive quantitative measurements. It involves measuring decays of laser light in an optical resonator (cavity) consisting of two or more mirrors. With a selectable laser source (1053nm and 1064nm) and a custom-designed cavity configuration, II-VI Optical Systems can test 12 possible scenarios (2 wavelengths, two input polarizations: s- and p-, three angles of incidence: 0°, 30°, and 45°) in linear and V-cavity configurations. The system is used regularly for evaluation of highly reflective mirrors where total losses do not exceed 1000ppm (i.e. 0.1%).

Test Beds for Evaluating Extinction Ratio

II-VI Optical Systems has several test beds for evaluating extinction at 632.8nm and 1064nm. The main differences are in the geometry/product that is evaluated at each of them. Some test setups are customized for extinction measurements at non-zero angles of incidence. 

Environmental and Durability

For the evaluation of product resistance to environmental conditions, II-VI Optical Systems uses temperature, humidity  and salt-spray/fog chambers.  This allows II-VI Optical Systems to derive data in accordance with the requirements for environmental and durability testing, as specified in Military standards MIL-C-675, MIL-M-13508, MIL-PRF-13830, MIL-C-48497 and MIL-F-48616.