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With a narrow peak on top of a broad-band gain profile in a laser, the group-velocity of light becomes significantly subluminal. The lasing frequency becomes extremely insensitive to cavity length change in such a laser.
With the increase of accelerator luminosity, the rate requirement for timing MRPC becomes important. Usually MRPCs are assembled with ordinary glass plates of 1.0 mm or thicker, but their rate capability is only about 200 Hz/cm2, which cannot afford to the future high rate requirement. DC model and a two dimensional resistor network model suggested that the rate capability of MRPC is largely dependent...
A high-energy, low threshold THz-wave output has been experimentally demonstrated with intracavity terahertz-wave parametric oscillator based on surface-emitted configuration. The maximum THz-wave output energy of 283nJ/pulse was obtained at 1.54THz under the pump threshold of 12.9mJ/pulse in the cavity. The continuously tunable range from 0.75 to 2.75 THz was realized.
We report high power operation of a Kagome-type HC-PCF at 1 μm. We demonstrate guidance of thin disk laser beam with powers in excess of 100 W in cw and 75 W in modelocked operation.
We demonstrate an extended depth of focus (DOF) for optical coherence tomography (OCT) using a Bessel-like higher order fiber mode. The DOF is enhanced by 7× and the lateral resolution is about 10 μm.
We show how a dual-peak gain produced via optical pumping and non-degenerate Raman pumps in a single vapor cell can be used to realize a superluminal ring laser with enhanced sensitivity for gyroscopy and accelerometry.
The wavefront of a λ=18.9 nm soft x-ray beam from an injection-seeded plasma amplifier was measured using a Hartmann sensor. An optical quality superior to that of the seed, up to λ/7 rms, was obtained.
The hydrophobic and self-cleaning effects of micro-nano structures have attracted much attention. In this paper, micro-nano structures have been successfully fabricated on glass substrates by laser interference lithography. The hydrophobic properties of the micro-nano structures have been studied by the determination of the water contact angle(CA). The resultant substrate with micro-nano structures...
We demonstrate for the first time ns-laser spark ignition through kagome-type fibers in a friendly manner. The energy threshold damage is pushed over the 10mJ-level and the output power density is approaching TW/cm2 after focusing.
A Kagome hollow-core PCF with a record loss of 40dB/km is used to deliver 74μJ and 850fs laser pulse with little propagation pulse-distortion, and to compress a 105μJ laser pulse from 900fs to 300fs.
Kagome fibers were fabricated with core size larger than 100 μm. The fibers combined low loss over broad transmission and with small bend loss, making it a potential solution for high power and fast laser delivery.
The linewidth of an injection-seeded 18.9nm molybdenum soft x-ray laser (SXRL) was measured to be significantly wider than seeded optical field ionization SXRLs that use gaseous targets, an advantage for the development of sub-picosecond SXRLs.
We have measured the near-field and far-field profiles (for λ=13.9 nm) as well as temporal coherence (for λ=18.9 nm) of injection-seeded and self-seeded solid-target amplifiers. The measurements were compared with model simulations.
A high-sensitivity, fast-response THz-wave detection using an organic nonlinear optical crystal of DAST has been demonstrated. In this report, the optimum performance of THz-wave detection was investigated in parameters such as the thickness of DAST, pump wavelength, and pumping intensity. Consequently, a higher sensitivity was obtained.
A delayed probe-pump technique shows the persistence of molecular coherence of rotational Raman resonance in hydrogen-filled hollow-core photonic crystal fiber over a time-scale ∼42 times longer than the dephasing time.
We report all-optical modulation at 2 GHz with 19 atto-joules, using a tapered nano-fiber embedded in Rb vapor. The switching energy is a record low value for modulation at this speed, requiring only 75 photons.
The two major components, sheet beam electron gun and interaction circuit, consisting the 0.5 THz Smith-Purcell device under development are being investigated in separate diagnosis systems. The thermionic cathode showed the required emission current density of 50 A/cm2 and assembled into the electron gun. The interaction circuit fabricated by laser machining is being investigated using the precise...
A monolithic integrated amplified feedback semiconductor laser is demonstrated as an optical microwave source. The optical microwave frequency is continuously tunable in the range of 19.87-26.3 GHz with extinction ratio above 6 dB, 3-dB linewidth about 3 MHz.
We perform measurements of far field pattern of various quantum-confined heterostructures namely quantum well (QW), quantum dash (Qdash), and quantum dot (Qdot) lasers to study the effect of different active gain mediums of semiconductor lasers on the optical beam quality and coupling efficiency. The beam pattern profile of the Qdash laser is similar to that of the QW laser (FWHM ~ 20deg) while Qdot...
We demonstrated the generation of an extremely bright lambda=32.6 nm laser beam with high spatial coherence by saturated amplification of high harmonic seed pulses in a soft X-ray laser plasma amplifier created heating a titanium target.
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