Lightmatter
Technology
LaserCharacterizationIntern
Neural analysis suggests this role is
optimal for Mid+ candidates.
“Laser Characterization Intern at Lightmatter. Skills: Laser characterization, Semiconductor lasers, Optical measurements, Python scripting. Execute State-of-the-Art laser testing. Perform characterization of semiconductor lasers”
Industry & Context.
Debugging open-ended lab issues; Debugging open-ended measurement issues
Capacity to comply with U.S. export control laws
What They're Looking For.
Must Have
PhD or advanced degree program enrollment, Understanding of semiconductor lasers, Understanding of laser physics, Understanding of basic semiconductor physics, Familiarity with laser characterization concepts, Hands-on experience with optical lab measurements, Hands-on experience with optical test equipment, Good understanding of semiconductor optical amplifiers, Experience using optical instruments, Analytical skills, Problem-solving skills, Ability to work independently, Ability to communicate results clearly
Nice to Have
Prior experience characterizing DFB lasers, Prior experience characterizing tunable lasers, Prior experience characterizing laser diodes, Prior experience characterizing semiconductor optical amplifiers, Experience with RIN measurements, Experience with SMSR measurements, Experience with linewidth measurements, Experience with wavelength stability measurements, Experience with long-term optical power stability measurements, Familiarity with fiber-optic alignment, Familiarity with polarization control, Familiarity with optical coupling, Familiarity with optical loss budgeting, Understanding of III-V semiconductor materials, Understanding of laser diode operation, Understanding of carrier dynamics, Understanding of optical gain, Understanding of thermal effects, Experience building automated optical characterization setups, Experience preparing clear characterization reports
What You'll Do.
Execute State-of-the-Art laser testing
Perform characterization of semiconductor lasers
Perform characterization of laser sources
Perform characterization of semiconductor optical amplifiers
Measure laser performance metrics
Measure SOA performance metrics
Analyze laser performance metrics
Analyze SOA performance metrics
Conduct LIV measurements
Evaluate laser behavior
Perform wavelength stability measurements
Perform optical power stability measurements
Characterize optical spectra
Support RIN measurements
Support SMSR measurements
Support optical power measurements
Support wavelength tuning measurements
Support stability measurements
Operate optical lab equipment
Develop Python automation scripts
Analyze measurement data
Support laser bring-up
Support laser validation
Support SOA validation
How You'll Work.
Team & Collaboration
Work closely with photonics teams; Work closely with laser teams; Work closely with packaging teams; Work closely with characterization teams
Communication Scope
Communicate results clearly
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! As a Laser Characterization Intern, you will focus on the fundamental performance, physics, and characterization of the semiconductor laser sources that power our photonic computing architecture. You will be responsible for executing State-of-the-Art (SOA) laser testing to ensure the highest levels of spectral purity and stability. Responsibilities Perform hands-on characterization of semiconductor lasers, laser sources, and semiconductor optical amplifiers. Measure and analyze laser and SOA performance metrics, including output power, wavelength, optical spectrum, side-mode suppression ratio, relative intensity noise, gain, saturation behavior, and wavelength/power stability. Conduct LIV measurements and evaluate laser behavior across current, voltage, temperature, and operating conditions. Perform wavelength and optical power stability measurements over time and across temperature. Characterize optical spectra using optical spectrum analyzers and related optical test equipment. Support RIN, SMSR, optical power, wavelength tuning, and stability measurements. Operate optical lab equipment such as current drivers, temperature controllers, optical spectrum analyzer
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