Summer 2027 Internship - Experimental Lasers (Undergraduate

Xcimer Energy leverages decades of research on Inertial Fusion Energy (IFE) combined with groundbreaking new laser architecture. Our mission is to deploy fusion power plants to meet global decarbonization goals as fast as possible. Xcimer has assembled a team of leaders in tough tech, fusion science, and manufacturing with a track record of rapid execution. Supported by leading investors, Xcimer is uniquely positioned to deliver limitless, clean, fusion power to combat climate change. Join us in powering a better world with inertial fusion!

This is a full-time, onsite 12-week summer internship based at our headquarters in Denver, CO.

As an Experimental Lasers Intern, you will apply your skills to building, aligning, and measuring the pulsed laser systems and diagnostics that support Xcimer's excimer laser development. You will be paired with a mentor in the Experimental Lasers group and work hands-on in the lab, on a project scoped to your background and interests. We are looking for our physicists and engineers to apply their technical expertise, problem solving skills, and dedication to quality to positively impact the future of energy!

Responsibilities

• Assemble, align, and operate pulsed laser setups and optical beamlines alongside an Experimental Lasers mentor.

• Build and calibrate diagnostics for pulse energy, duration, spectrum, and beam profile, and reduce the raw data to results.

• Compare measurements against first-order models from textbooks and the published literature.

• Help plan and run experiments on a team project, keeping clear records of setups, data, and findings.

• Present your results to the team and at a company-wide Lunch and Learn at the end of the summer.

Qualifications

• Education: Pursuing a BS in physics, optics, electrical engineering, or a related field, with at least sophomore year completed by summer 2027.

• Experience: Hands-on lab work through an upper-division lab course, a research group, senior design, or an independent build project.

• Clear written and verbal communication.

• Available to work full-time onsite in Denver for all 12 weeks.

• Must be a U.S. citizen or national, U.S. permanent resident (current Green Card holder), or lawfully admitted into the U.S. as a refugee or granted asylum.

Desired

• Familiarity with pulsed lasers or harmonic frequency conversion.

• Exposure to pulse diagnostics such as energy meters, photodiodes, spectrometers, or beam profilers, and to analyzing the data in Python, MATLAB, or similar.

• Background working around vacuum systems, high voltage, or Class 4 lasers under a safety program.

• Skilled at optical alignment from a lab course, research group, or personal project.