We demonstrate energy exchange between two filament-forming femtosecond laser beams in liquid methanol. Our results are consistent with those of previous works documenting coupling between filaments in air; in addition, we identify an unreported phenomenon in which the direction of energy exchange oscillates at increments in the relative pulse delay equal to an optical period (2.6 fs). Energy t...

The output characteristics are described of an X-ray preionized discharge pumped XeC1 laser, fed by a low-impedance pulse forming line (PFL), at pressures up to 12 bar. The influence of a multichannel rail gap placed between the PFL and the laser head on the output energy was studied. We found an increase of output energy with increasing pressure up to 8 bar. At higher pressures a saturation be...

1. INTRODUCTION Photoassociation, forming molecules from ultracold atoms using laser light, is a prime example of coherent control: The process is complex and poses many challenges, yet typically the molecular structure is simple enough to identify pathways for control. Laser cooling schemes that work for atoms 1−5 tend to fail for molecules, mainly due to the presence of many near-resonance li...

The introduction of a plasma in a free-electron laser (FEL) helps radiation guiding via nonlinear refraction. At highradiation power density, when oscillatory electron velocity is comparable to the electron thermal velocity, the radiation pushes plasma radially out, forming a depleted plasma duct and guiding the radiation. The radius of the self-trapped laser is ~C/OJPO , where UJPO is the unpe...

This Letter reports on an optical pumping scheme, termed resonant pumping, for an erbium-doped distributed feedback (DFB) waveguide laser. The scheme uses two mirrors on either side of the DFB laser, forming a pump cavity that recirculates the unabsorbed pump light. Symmetric distributed Bragg reflectors are used as the mirrors and are designed by matching the external and internal quality fact...

This study presents a finite element method (FEM) based three-dimensional laser forming process design methodology for thin plates to determine the laser scanning paths and heating conditions. The strain fields were first calculated via FEM. The laser scanning paths were chosen perpendicular to the averaged principal minimum strain direction. The ratios of in-plane and bending strain were calcu...

Laser Doppler Velocimetry (LDV) has been employed to determine pseudo-turbulence characteristics of the flow field around bubble train forming in non-Newtonian caboxymethylcellulose (CMC) aqueous solution at low gas flow rate condition. The Reynolds stress and turbulent intensity of the liquid were investigated by means of Reynolds time-averaged method. The experimental results show that ax...

We excite the 717-nm electric quadrupole 6D3/2 ↔ 7S1/2 transition in a laser-cooled 232Th3+ ion crystal. The transition frequency and the lifetime of the metastable 7S1/2 level are measured to be 417 845 964(30) MHz and 0.60(7) s, respectively. We subsequently employ the 7S1/2 level to drive the ions with nanosecond-long 269-nm laser pulses into the 7P1/2 level. The latter is connected to the 7...