Physicist Postdoctoral Fellow

Job title: Physicist Postdoctoral Fellow

Company: Berkeley Lab

Job description: Lawrence Berkeley National Lab’s ( ) Accelerator Tech-Applied Physics ( ) Division has an opening for a Physicist Postdoctoral Fellow to join the team.

In this exciting role, you will work on developing ultrafast fiber laser technologies and their novel applications on laser-plasma accelerators (LPA). The BELLA Center at LBNL’s ATAP Division seeks to develop high repetition rate, terawatt, ultrafast fiber laser technology, with the goal to drive multi-kHz, MeV-class LPAs.

You will explore novel methods in the field, including coherent combination of laser pulses in temporal, spectral, and spatial domains, gain narrowing compensation, state-of-the-art high-power fiber amplification, nonlinear pulse compression, new LPA methods, and advanced digital control of laser and accelerator systems including machine learning. Combining these methods with numerical and analytic physics models, we have been running proof-of-principle demonstrations of energy-scalable technologies, moving toward increasingly energetic laser systems.

What You Will Do:

Design and perform experiments to investigate the spectral combination of fiber chirped-pulse amplifiers (FCPA), as well as temporal stacking of amplified femtosecond pulses using cascaded optical interferometers.

Investigate pulse dynamics (including nonlinearity, gain narrowing and saturation, dispersion) in multi-stage, high-power FCPA systems, their interplay with coherent combination processes for amplified pulses, and methods to control and optimize them.

Characterize different kinds/designs of large-mode-area fiber amplifiers in temporal and spectral regimes, and use data to refine numerical models for system design and optimization.

Study and apply feedback control methods to stabilize the temporal and spectral combination of amplified, ultrashort laser pulses. Explore advanced digital control concepts, including machine learning, for laser and accelerator systems.

Document and communicate the results of work in reports and oral presentations, including participation in meetings, reviews, conferences, and publications in refereed journals.

Additional Responsibilities as needed:

Build and test optical systems (fiber and free-space) to spectrally broaden and temporally compress energetic ultrashort laser pulses to the few-cycle regime, by manipulating optical nonlinearity and dispersion.

Study and conduct low-energy (kHz, MeV) LPA experiments.

Build and perform experiments to investigate spatial beam combination schemes, comparing different stabilization algorithms and sensing methods.

What is Required:

Ph.D. in Physics or Engineering, in the field of lasers, optics, or laser applications.

Experimental experience with coherently combined ultrafast fiber laser systems, their diagnostics and controls, or/and the design, characterization, operation of high-power FCPA lasers.

Experimental experience with digital or/and analog feedback control of optical/physical systems.

Experience with simulations or modeling of ultrafast laser systems.

Ability to work closely in a team with other scientists, postdocs, graduate students, and technicians.

Desired Qualifications:

Experimental experience with nonlinear ultrashort laser pulse compression.

Experimental experience with laser-plasma interactions and acceleration.

Experience with programming and machine learning.

Excellent verbal and written communication skills.


This is a full-time 1 year, postdoctoral appointment with the possibility of renewal based upon satisfactory job performance, continuing availability of funds, and ongoing operational needs. You must have less than 4 years of paid postdoctoral experience. Salary for Postdoctoral positions depends on years of experience post-degree.

This position is represented by a union for collective bargaining purposes.

Salary will be predetermined based on postdoctoral step rates.

This position may be subject to a background check. Any convictions will be evaluated to determine if they directly relate to the responsibilities and requirements of the position. Having a conviction history will not automatically disqualify an applicant from being considered for employment.

Diversity, equity, and inclusion are core values at Berkeley Lab. Our excellence can only be fully realized by faculty, students, and staff who share our commitment to these values. Successful candidates for our faculty positions will demonstrate evidence of a commitment to advancing equity and inclusion.

Work will be primarily performed at Lawrence Berkeley National Lab, 1 Cyclotron Road, Berkeley, CA.

Equal Employment Opportunity: Berkeley Lab is an Equal Opportunity/Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, age, or protected veteran status. Berkeley Lab is in compliance with the Pay Transparency Nondiscrimination Provision under 41 CFR 60-1.4. Click to view the poster and supplement: “Equal Employment Opportunity is the Law.”

Lawrence Berkeley National Laboratory encourages applications from women, minorities, veterans, and other underrepresented groups presently considering scientific research careers.

Expected salary:

Location: California

Job date: Thu, 17 Dec 2020 04:35:39 GMT

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