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Fiber array optical systems that are used for free-space optical communications and phased laser beam projection applications depend on fast, closed-loop adaptive control to efficiently compensate for optical distortion caused by atmospheric turbulence. Current off-the-shelf systems are limited in performance, fiber array control channels, and flexibility. In this research project, we built a scalable...
We demonstrated a hollow-core photonic crystal fiber as an absorption cell to observe the third harmonic derivative signal for laser frequency stabilization to P(9) line of the acetylene ν1 + ν3 overtone band.
We propose a new technique for femtosecond pulse characterization — transient-grating self-referenced spectral interferometry. Using this technique, we built an extremely simple, alignment-free device and successfully sub-two-cycle 10-fs pulses at 1.75 μm.
Tunable multicolor femtosecond pulses were simultaneously obtained by a cascaded FWM process in fused silica glass. Frequency up-shift and down-shift pulses with energies about 1 muJ, durations of 45 fs sidebands were obtained.
In this paper, we have demonstrated 2.0 W of CW output power with a slope efficiency of 40% for Yb:CNGG and the passively Q-switched operation delivered 1.35 W of average output power at a PRF of 16.7 kHz. Here we demonstrate passive mode-locking of the disordered laser crystal Yb:CNGG using a semiconductor saturable absorber mirror (SESAM).
High-power photo conductive semiconductor switches with a gap of 12 mm were fabricated from semi-insulating GaAs, in which carbon acceptor impurity was compensated by deep EL2 donor defect, resulting in very large dark resistivity. Triggered by laser pulse with different optical energy at wavelength of 1064 nm and 532 nm, photoconductivity tests of the PCSS at different bias voltage are underway....
Hypervelocity (∼1000 km/s) impact of a macroscopic particle (macron) has profound influences in high energy density physics (HEDP) and impact fusion studies. As the charge-mass ratio of macrons are too low, the length of a electrostatic accelerator can reach hundreds to thousands of kilometers, rendering hypervelocity impact impractical. To reduce the accelerator length, a much higher electric field...
Long-range periodic nanoplane gratings written inside fused silica using a focused femtosecond laser beam can be erased and replaced with new gratings whose orientation is determined by the polarization of the femtosecond laser overwrite beam.
The generation of 12.4 W of output power with optical-to-optical conversion efficiency of 47% and slope efficiency of 74% is demonstrated in Yb:KGW laser end-pumped with high-power diode bars. Thermal-lensing and laser tuning has been investigated.
Room temperature laser operation near 1030 nm of Yb3+ in the disordered crystal NaGd(WO4)2 with slope efficiencies exceeding 30%, output powers more than 300 mW, and tuning from 1016 to 1049 nm are demonstrated
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