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A new approach (ThinZag®) for scaling Nd:YAG solid-state slab lasers to high power levels is described. Using an innovative optical configuration, thin slabs of solid-state gain material are immersed in a flowing cooling fluid, resulting in improved thermal management. Measurements at the ~1 kW level were conducted to compare Nd:YAG ceramic with Nd:YAG crystalline slabs. The ceramic slabs demonstrated...
The physical effects leading to filament formation of intense femtosecond laser pulses propagating in air will be introduced. Recent developments and potential applications of filamentation will be described.
Diagnosis of the on-target focal spot using the current OMEGA EP diagnostics is challenging due to differential piston uncertainty and calibration errors. Performance was improved by retrieving phase information from far-field images using numerical optimization.
For controlling non-resonant molecular fragmentation process, simultaneous effect of chirp and polarization of a femtosecond pulse is mutually independent. For multiphoton fluorescence microscopy and optical tweezers with high-repetition-rate lasers, inter-pulse separation and polarization is important.
Transverse displacements of the circularly polarized components of a light beam nonnormally incident on GaAs and Silicon are spatially resolved. The imaging relies on pump-probing of two-photon absorption and optically induced free carrier absorption.
We present the latest results on high-power extreme-ultraviolet (EUV) light sources for lithography. This includes operation of high-power pulsed CO2 lasers, high repetition-rate Sn droplet targets, and collection of EUV light using multilayer-coated optics.
A nanoscale hole placed centrally in the core of a PCF breaks the degeneracy between radially and azimuthally polarized modes, causing a large splitting in phase velocity, group velocity and dispersion.
We exploit stimulated-Raman-scattering to generate polarisation-vortices over 3-Stokes-shifts (40-THz) with a specially-designed optical fiber. This illustrates the possibility of generating these beams, of immense recent interest, at any wavelength that nonlinear processes in glass allow.
We demonstrate a unique pump-probe scheme for high harmonic spectroscopy, which is sensitive to weak excitations and provides spectral information without the need for a VUV spectrometer.
0.7 watts 355nm laser is achieved from 3rd-order-QPM PPMgSLT by sum-frequency generation of fundamental and second-harmonic of pulsed Nd: YVO4 laser. 2nd-order-QPM PPMgSLT is successfully fabricated, which promises 355 nm generation of sub-watts order.
Thermal dephasing due to two-photon absorption-induced linear absorption is reduced by minimizing second- and fourth-harmonic beam overlap through tight elliptical focusing perpendicular to the walk-off plane, leading to multi-watt, high-repetition rate ultraviolet generation in BBO.
We derived an expression for the noise between the diffraction orders from a random grating. The result was applied to analyze the statistical duty-cycle error in PPLN, providing an efficient means for poling quality evaluation.
When femtosecond laser pulses are focused in the bulk of transparent materials (glasses), deposition of energy on a restricted volume can occur owing to the non linear character of the laser matter interaction. As a consequence, the possibility to generate micrometer-sized structural modifications arises. Those local changes are often associated with a minute variation in the refractive index which,...
15TW picosecond 10μm laser pulses are obtained at the UCLA Neptune Laboratory achieving record CO2 laser power. This peak power opens unique opportunities for applications in high-field experiments in the mid-IR range.
200-fs 2.5-mJ pulses from a cw-diode-pumped Yb:CaF2 MOPA are spectrally broadened in Ar and recompressed to 30 fs at 980 nm using a prism pair. Multi-millijoule 12-fs pulses are feasible upon higher-order spectral phase correction.
We present femtosecond induced volume Bragg gratings (VBGs) using a phase mask technique. For the first time we could realize reflecting VBGs in fused silica with a high period stability and periods down to 537.5nm.
Reduced threshold currents and high temperature operation in surface emitting quantum cascade lasers are demonstrated by using ring-based cavities. The devices exhibit robust and tunable single-mode operation as well as low divergence symmetric beams.
We investigate the transmission of a cw laser interacting with rubidium vapor and a frequency comb. The results reveal various regimes of competition and the importance of optical pumping and power broadening of the lasers.
The frequency characteristics of the beam scanning with KTa1-xNbxO3 crystals are described. The scanning angle remains in the same up to 400 kHz. Our proposed new scanning model supports this high-speed beam scanning.
We have demonstrated that frequency upconversion in periodically-poled LiNbO3 is capable of reaching single-photon sensitivities for detections at 1.27 μm and 1.57 μm at room temperature.
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