Lightmatter is leading the revolution in AI data center infrastructure, enabling the next giant leaps in human progress. The company invented the world’s first 3D-stacked photonics engine, Passage™, capable of connecting…
Lightmatter is leading the revolution in AI data center infrastructure, enabling the next giant leaps in human progress. The company invented the world’s first 3D-stacked photonics engine, Passage™, capable of connecting…
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Lightmatter is leading the revolution in AI data center infrastructure, enabling the next giant leaps in human progress. The company invented the world’s first 3D-stacked photonics engine, Passage™, capable of connecting…
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Lightmatter is leading the revolution in AI data center infrastructure, enabling the next giant leaps in human progress. The company invented the world’s first 3D-stacked photonics engine, Passage™, capable of connecting…
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Lightmatter is leading the revolution in AI data center infrastructure, enabling the next giant leaps in human progress. The company invented the world’s first 3D-stacked photonics engine, Passage™, capable of connecting…
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$212k–$320k/yr
Full-time
postgraduate degree
Comprehensive Health Care Plan, Retirement Savings Matching Program, Life Insurance, Generous Time Off, Paid Family Leave, Short Term Disability
Posted 8h ago
~40 hrs/week
Responsibilities
You will own the design of high-power laser epitaxial structures and devices, including DFB, DBR, and external-cavity architectures for integrated laser solutions. You will also collaborate with cross-disciplinary teams to translate system requirements into manufacturable hardware and mentor engineers on laser technology roadmaps.
Requirements
A Ph.D. or M.S. in Photonics, Electrical Engineering, Applied Physics, or a related field is required, along with at least 5-8 years of relevant experience in semiconductor laser and epitaxy design. Candidates must possess deep expertise in III-V material systems and proficiency with physics-based laser simulation tools.
Full job description
Lightmatter is leading the revolution in AI data center infrastructure, enabling the next giant leaps in human progress. The company invented the world’s first 3D-stacked photonics engine, Passage™, capable of connecting thousands to millions of processors at the speed of light in extreme-scale data centers for the most advanced AI and HPC workloads.
Lightmatter raised $400 million in its Series D round, reaching a valuation of $4.4 billion. We will continue to accelerate the development of data center photonics and grow every department at Lightmatter!
If you're passionate about tackling complex challenges, making an impact, and being an expert in your craft, join our team of brilliant scientists, engineers, and accomplished industry leaders.
Lightmatter is (re)inventing the future of computing with light!
We are hiring a Laser Design Engineer to join our laser module development team. In this role, you will own the design of high-power laser epitaxy and laser devices—including DFB, DBR, and external-cavity architectures—for Lightmatter’s integrated and highly scalable laser solutions for AI communications and computation. You will drive designs from epitaxial layer stack through cavity and device architecture, working closely with colleagues and cross-disciplinary engineering teams internally and across our ecosystem of manufacturing partners to translate system requirements into robust, manufacturable, high-reliability hardware.
This role requires deep expertise in semiconductor laser and epitaxy design, a strong command of laser and semiconductor device physics, and the judgment to navigate the design space of performance, schedule, reliability, power consumption, and cost. As a senior technical anchor, you will plan and execute across multiple concurrent programs, resolve critical and often ambiguous technical challenges with limited oversight, develop new methods and design approaches, and serve as a recognized internal subject-matter expert. Creativity, analytical rigor, and clear communication are essential.
Join a tight-knit team where each individual’s contributions directly influence the success of the company and product. You’ll have the opportunity to build innovative laser solutions from the ground up and tackle groundbreaking challenges. Work with people who love to build and who thrive in diverse technical environments where great ideas are prioritized.
Responsibilities
Own the design of high-power laser epitaxial structures and laser devices—including DFB, DBR, and external-cavity architectures.
Design epitaxial layer stacks in III-V material systems, optimizing for optical gain, carrier confinement, threshold current density, wall-plug efficiency, and high-temperature performance.
Optimize laser cavity designs to achieve target output power, precise wavelength control, narrow linewidth, high side-mode suppression ratio (SMSR), low relative intensity noise (RIN), and robust back-reflection tolerance.
Contribute to monolithic and silicon-photonics heterogeneously integrated laser and semiconductor optical amplifier (SOA) development.
Use physics-based and traveling-wave simulation tools to model heterostructure and cavity behavior, spectral response, and tuning, translating high-level system needs into detailed device designs.
Partner with the characterization team to define test beds and map measured L-I-V curves, near-/far-field profiles, thermal coefficients, and linewidth back to design parameters, iterating to close performance gaps.
Collaborate across disciplines—systems, analog/electrical, packaging, and thermal engineering—to define component-level specs derived from link budgets, co-design drivers and submounts, and define optical coupling and thermal-management strategies.
Work with epitaxy and foundry vendors to specify, qualify, and transfer designs into volume manufacturing.
Act as an internal subject-matter expert and thought leader on laser device and epi design; mentor engineers, review designs, and contribute to the laser technology roadmap for performance, scalability, power, and cost.
Publish and present novel ideas, and participate in premier photonics conferences.
Requirements
A Ph.D. in Photonics, Electrical Engineering, Applied Physics, Materials Science, or a related discipline with at least 5 years of relevant post-degree experience; or an M.S. with at least 8 years of relevant experience; or equivalent experience.
Deep, hands-on expertise in semiconductor laser and epitaxy design for III-V compound semiconductor devices.
Proven track record designing DFB, DBR, and/or external-cavity lasers.
Strong grounding in laser physics and semiconductor device physics (optical gain, threshold, slope efficiency, RIN, linewidth, thermal rollover, and back-reflection behavior).
Proficiency with physics-based laser and photonic device simulation tools (e.g., PhotonDesign Harold/PICWave, VPIphotonics, Lumerical, or equivalent) and data analysis in Python.
Demonstrated ability to independently own complex designs spanning multiple programs, and to resolve critical, ambiguous technical issues as a recognized subject-matter expert.
Track record of close collaboration with characterization/test teams and cross-functional hardware teams.
Ability to convey complex technical concepts to both technical and non-technical stakeholders with strong and clear communication.
Preferred Qualifications
Experience with silicon photonics and heterogeneous integration of III-V gain material on silicon.
Experience with high power semiconductor lasers for datacom applications.
Experience maturing a laser product from prototype through high-volume manufacturing, including epi growth and reliability qualification.
A record of publishing novel photonics results and engaging with the broader optics community.
Willing and able to learn quickly, self-starter with a “no task is too big or small” attitude.
We offer competitive compensation. The base salary range for this role determined based on location, experience, educational background, and market data.
Salary Range: total compensation goes beyond base salary, it also includes a new hire equity grant, annual performance-based equity, and other rewards that recognize your impact and contribution.
$212,000—$320,000 USD
Benefits
Comprehensive Health Care Plan (Medical, Dental & Vision)
Retirement Savings Matching Program
Life Insurance (Basic, Voluntary & AD&D)
Generous Time Off (Vacation, Sick & Public Holidays)
Paid Family Leave
Short Term & Long Term Disability
Training & Development
Commuter Benefits
Flexible, hybrid workplace model
Equity grants (applicable to full-time employees)
Benefits eligibility may vary depending on your employment status and location. Lightmatter recruits, employs, trains, compensates, and promotes regardless of race, religion, color, national origin, sex, disability, age, veteran status, and other protected status as required by applicable law.
Export Control
Candidates should have capacity to comply with the federally mandated requirements of U.S. export control laws.
Related keywords
Laser DesignEpitaxyIII-V SemiconductorsDFBDBRExternal-cavity LasersPhotonicsSilicon PhotonicsSOASemiconductor PhysicsLumericalVPIphotonicsPythonData Center InfrastructureAI CommunicationsHardware Engineering
We are building the engine that will power discoveries, drive progress, and redefine what computers—and human beings—are capable of.
Offices: 800 W El Camino Real, Mountain View, California 94040, US · 100 Summer St, Boston, Massachusetts 02136, US · 18 King St E, Suite 1200, Toronto, Ontario M5C 1C4, CA
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