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High intensity laser-plasma interactions produce a wide array of energeticparticles and beams with promising applications. Unfortunately, high repetitionrate and high average power requirements for many applications are notsatisfied by the lasers, optics, targets, and diagnostics currently employed.Here, we address the need for high repetition rate targets and optics throughthe use of liquids. A novel nozzle assembly is used to generate high-velocity,laminar-flowing liquid microjets which are compatible with a low-vacuumenvironment, generate little to no debris, and exhibit precise positional anddimensional tolerances. Jets, droplets, submicron thick sheets, and otherconfigurations are characterized with pump-probe shadowgraphy to evaluate theiruse as targets. To demonstrate a high repetition rate, consumable liquidoptical element, we present a plasma mirror created by a submicron thick liquidsheet. This plasma mirror provides etalon-like anti-reflection properties inthe low-field of 0.1% and high reflectivity as a plasma, 69%, at a repetitionrate of 1 kHz. Practical considerations of fluid compatibility, in-vacuumoperation, and estimates of maximum repetition rate, in excess of 10 kHz, areaddressed. The targets and optics presented here enable the use ofrelativistically intense lasers at high average power and make possible manylong proposed applications.

High repetition rate (>= kHz) targets and optics from liquid microjets for the study and application of high intensity laser-plasma interactions