March 2015 | Dexter, MI, USA — Recent advancements in high-order harmonic generation (HHG) of vacuum ultraviolet (VUV) at MHz repetition rates provide a wide photon energy range, 13-45eV (up to ~39th harmonic), with ultrafast time resolution. This new publication and related video abstract from Prof. Wolf Widdra group at Martin-Luther-Universität, Halle-Wittenberg, Germany provides a good comparison of traditional techniques with ToF-ARPES using MHz, high-order harmonics. This paper explains ideal conditions for ARPES that can be achieved with Model IMPULSE based High-Order harmonic generation.

Fiber-laser based HHG setup for photoemission experiments with one of the coauthors, Dr. M. Huth and on the right, Model IMPULSE from Clark-MXR.

The initial demonstration of megahertz high-order harmonic generation with Model IMPULSE is described in this 2014 publication that shows electron pair emission from metal surfaces, that can essentially replace a synchrotron radiation source paving path to build a tabletop synchrotron with high-order harmonic generated with Model IMPULSE laser from Clark-MXR.

The Model IMPULSE from Clark-MXR is a one-box, all diode-pumped Yb-doped fiber oscillator/amplifier with full computer control of major laser parameters. The standard model is >20W average power with user adjustable repletion rate from 200kHz to 25MHz. It can be synchronized to an external clock (PhaseShifter version) with available customized high power/high energy versions and can pump two NOPAs simultaneously. Please contact Clark-MXR for further details.

About Clark-MXR: Clark-MXR ( has been instrumental in the development of innovative ultrashort pulse laser-based solutions for scientific, industrial, and medical applications. Its products and services include ultrashort pulse laser sources, integrated ultrafast micromachining workstations and spectroscopy instrumentation.  It also performs contract manufacturing for third parties using ultrashort pulses of light.  The company is an active participant in the SBIR program and has received over 17 awards, often in partnership with academic and industrial institutions.