The term photonic crystals appears because of the analogy between electron waves in crystals and the light waves in artificial periodic dielectric structures. During the recent years the investigation of one-, two-and three-dimensional periodic structures has attracted a widespread attention of the world optics community because of great potentiality of such structures in advanced applied optical fields. The interest in periodic structures has been stimulated by the fast development of semiconductor technology that now allows the fabrication of artificial structures, whose period is comparable with the wavelength of light in the visible and infrared ranges.

http://ieeexplore.ieee.org/iel5/6354/16969/00781867.pdf

Photonic crystals

There has been dramatic progress in use of femtosecond optical pulses for the development and characterization of picosecond far-infrared light sources and detectors.1·2 Far-infrared (~1 THz) generation techniques based on Hertzian dipole emission from biased ultra fast photoconductive antennas, Cherenkov radiation in electro-optic crystals, and charge acceleration via the built-in electric field present at semiconductor surfaces have been reported.

Picosecond pump and probe spectroscopy using freely propagating terahertz radiation

We have developed an all-solid-state master-oscillator-power-amplifier system employing Ce:LiCAF, a new degradation-free tunable ultraviolet laser medium pumped by the fourth harmonic of conventional 10-ns Q -switched Nd:YAG lasers. The low- Q , short-cavity Ce:LiCAF master oscillator produced a satellite-free 1-ns pulse under appropriate pumping-fluence control. 18% energy extraction with sufficient gain was achieved in a single-stage, confocal, double-pass amplifier. As a result, 289-nm, 1-ns, 14-mJ pulses were efficiently obtained from this simple laser system.

Ultraviolet short pulses from an all-solid-state Ce:LiCAF master-oscillator-power-amplifier system

A method of managing radiation having a frequency in the terahertz and/or microwave regions. The method comprises providing a semiconducting device having a two-dimensional carrier gas. Plasma waves are generated in the carrier gas using a laser pulse. The frequency of the plasma waves, and as a result, the generated radiation are adjusted using a voltage applied to the semiconducting device.

Method of radiation generation and manipulation

We report the use of extreme broadband, high reflectivity >99.5%, optical parametric oscillator (OPO) cavity mirrors. A continuous-wave, doubly resonant, OPO demonstrated tuning over a range of 791-1620 nm with a single mirror set. Wavelength tuning was performed by temperature tuning the nonlinear material of lithium triborate. Narrow linewidth oscillation was confirmed throughout the tuning range, and threshold pump power increased gradually from 50 mW near the degeneracy to 800 mW at the tuning band edge in a double-pass pumping configuration.

Broadband Tuning of a Continuous-Wave, Doubly Resonant, Lithium Triborate Optical Parametric Oscillator from 791 to 1620 nm

We have proposed a new THz radiation generation scheme using an intracavity saturable Bragg reflector (SBR) in a magnetic field. With this simple scheme using a simple and damage-free device, THz radiation peaked at around 0.8 THz and 0.8 /spl mu/W average power was directly generated. That power level is the same level as that of complicated and damage-sensitive photoconductive antenna.

Intense THz-radiation generation from an intracavity saturable Bragg reflector in a magnetic field

Summary form only given. We report the strong enhancement of THz radiation from an InAs irradiated with femtosecond laser pulses after surface cleaning and cooling.

Significant enhancement of the THz radiation from an InAs (100) clean surface at low-temperature

Ce/sup 3+/:LiLuF/sub 4/ has become the first known all-solid-state tunable UV laser directly pumped by the fifth harmonic of a Nd:YAG laser. Furthermore, we have demonstrated the direct stable generation of single, satellite-free, 880-ps UV pulses under 5-ns, 10-Hz repetition rate pumping conditions.

All-solid-state UV tunable picosecond Ce/sup 3+/:LiLuF/sub 4/ laser pumped by the fifth harmonic of Nd:YAG laser

Various widely tumble solid-state lasers and optical parametric oscillators have been developed. In these lasers, however, the tuning region is limited by the bandwidth of coatings rather than the potential tuning region of the material itself. For example, typically four mirror sets must be changed for the entire tuning range of cw Ti:sapphire lasers.

Full-range tunable CW Ti:sapphire laser with a single set of extremely broad-band, low-loss mirrors

Recently developed tunable solid-state UV laser material Ce/sup 3+/:LiLuF/sub 4/ (Ce:LLF) with tunability of about 305-340 nm is attractive for a variety of applications including environmental remote sensing and combustion diagnostics.

All-solid-state UV-tunable picosecond Ce/sup 3+/:LiLuF/sub 4/ laser pumped at 213 nm

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