Process Engineer

Job Description

KEY JOB DUTIES & RESPONSIBILITIES:

• Process Development & Optimization
• Develop and optimize chemical-mechanical polishing and fine grinding techniques for ZnSe.
• Establish process parameters (abrasive selection, pressure, speed, slurry composition, pH control, temperature).
• Reduce defects such as surface haze, scratches, subsurface damage, and roughness through process improvements.
• Improve Beveling Process and design CNC Programming for Milling Machine
• Production & Quality Control
• Implement statistical process control (SPC) for polishing uniformity.
• Define quality criteria (flatness, roughness, surface irregularities) based on interferometry.
• Work with the Quality Assurance team to ensure compliance with optical performance standards (ISO 10110, MIL-PRF-13830B) .
• Tooling & Equipment Management
• Maintain and optimize lapping and polishing equipment (single/double-sided polishers, planetary systems), Chucks, Base and Holders.
• Evaluate new tools, pads, slurries, and coatings to enhance performance.
• Develop predictive maintenance programs to ensure equipment reliability.
• Defect Analysis & Root Cause Investigation
• Perform failure analysis using optical microscopy, interferometry, and SEM .
• Address process deviations and propose corrective actions to minimize yield loss.
• Optimize edge rounding, stress-relief polishing, and surface conditioning techniques.
• Process Automation & Efficiency Improvements
• Implement automation and Industry 4.0 technologies for real-time process monitoring.
• Develop standard work procedures and automation scripts for consistent polishing outcomes.
• Environmental & Safety Compliance
• Ensure handling of ZnSe follows EPA, OSHA, and material safety regulations.
• Develop waste management protocols for slurry disposal and recycling.
• Conduct risk assessments (FMEA, HAZOP) for chemical exposure and process hazards.
  
  

Required

Qualifications & Experience:

✔️ Bachelor's Degree in Engineering (Mechanical, Chemical, or Manufacturing Engineering)

✔️ 1-3 years of experience in precision optics polishing, CMP, semiconductor wafer processing, or CNC Precision Machining

✔️ Proficiency in material properties, surface roughness control, and finishing/polishing techniques

✔️ Proficiency in Tooling Design, CNC Programming, metrology and GD&T

✔️ Experience with abrasives (CeO₂, Al₂O₃, diamond), slurries, and polishing chemistries

✔️ Strong knowledge of ISO 10110 optical surface specifications and MIL standards

✔️ Familiarity with metrology tools (interferometers, profilometers, AFM, SEM)

Preferred

✅Six Sigma Certification (Green/Black Belt) for process optimization

✅ Experience with precision optics manufacturing (lenses, IR windows, laser optics)

✅ Knowledge of fluid dynamics in polishing slurry distribution

✅ Proficiency in Python, MATLAB, or LabVIEW for process automation

Key Skills & Competencies

• Process Optimization & Root Cause Analysis – Expertise in reducing polishing defects
• Material Science & Surface Engineering – Understanding of ZnSe behavior under different conditions
• Metrology & Quality Assurance – Experience with precision optical measurements
• Lean Manufacturing & Continuous Improvement – Experience with SPC, DOE, and yield enhancement
• Technical Writing & Documentation – SOP development for consistent process execution
  
  

Work Environment

• Cleanroom or controlled laboratory environment with polishing equipment
• May involve chemical handling and exposure to polishing slurries
• Requires close collaboration with production, equipment and quality teams across different sites in Asia and US.
  
  

About Us

Coherent is a global leader in lasers, engineered materials and networking components. We are a vertically integrated manufacturing company that develops innovative products for diversified applications in the industrial, optical communications, military, life sciences, semiconductor equipment, and consumer markets. Coherent provides a comprehensive career development platform within an environment that challenges employees to perform at their best, while rewarding excellence and hard-work through a competitive compensation program. It's an exciting opportunity to work for a company that offers stability, longevity and growth. Come Join Us!

Note to recruiters and employment agencies: We will not pay for unsolicited resumes from recruiters and employment agencies unless we have a signed agreement and have required assistance, in writing, for a specific opening.

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