Burst-mode femtosecond laser electronic excitation tagging for kHz–MHz seedless velocimetry

Selective Two-Photon Absorptive Resonance Femtosecond- Laser Electronic-Excitation Tagging (STARFLEET) Velocimetry in Flow and Combustion Diagnostics

Selective Two-Photon Absorptive Resonance Femtosecond-Laser Electronic-Excitation Tagging (STARFLEET), a non-seeded ultrafast-laser-based velocimetry technique, is demonstrated in reactive and non-reactive flows. STARFLEET is pumped via a two-photon resonance in N2 using 202.25-nm 100-fs light. STARFLEET greatly reduces the per-pulse energy required (30 μJ/pulse) to generate the signature FLEET...

Common-path heterodyne laser-induced thermal acoustics for seedless laser velocimetry.

We demonstrate the use of a novel technique for the detection of heterodyne laser-induced thermal acoustic signals that allows the construction of a highly stable seedless laser velocimeter. A common-path configuration is combined with quadrature detection to provide flow direction, to greatly improve robustness to misalignment and vibration, and to give reliable velocity measurement at low-flo...

Burst Mode Q:switched Laser Pulses for Plasma Excitation in LIBS Analysis

Kerr - lens mode - locked femtosecond laser

We have measured the frequency of the 6s S1/2 − 5d D3/2 electricquadrupole transition of Yb with a relative uncertainty of 1 × 10, νY b = 688 358 979 309 312 Hz ± 6 Hz. A femtosecond frequency comb generator was used to phase-coherently link the optical frequency derived from a single trapped ion to a cesium fountain controlled hydrogen maser. This measurement is one of the most accurate measur...

Quasi-continuous burst-mode laser for high-speed planar imaging.

The pulse-burst duration of a compact burst-mode Nd:YAG laser is extended by one order of magnitude compared to previous flashlamp-pumped designs by incorporating a fiber oscillator and diode-pumped solid-state amplifiers. The laser has a linewidth of <2 GHz at 1064.3 nm with 150 mJ per individual pulse at 10 kHz. The performance of the system is evaluated by using the third-harmonic output at ...