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In this paper, we propose a scheme to generate tunable attosecond coherent X-ray radiation for future light source applications. This scheme uses a short-pulse seeding laser, two bunch compressors, and a laser chirper to generate a prebunched, kilo-Ampere current electron beam from an initial 10-Ampere low-current electron beam. Such an electron beam sent into a short undulator generates attosecond coherent soft X-ray radiation. The final X-ray radiation wavelength can be tuned by adjusting the compression factor. It also allows one to control the final radiation pulse length by controlling the seeding laser pulse length or the compression factor. As an illustration, we present an example to generate 1 GW, 200 attosecond, 1 nm coherent X-ray radiation from a 28 A current, 200 nm laser modulated beam. [ABSTRACT FROM AUTHOR]

In this paper we present two-color GaAs/AlGaAs quantum cascade lasers with separate optical confinement of the two laser stacks. The laser stacks, each comprising cladding layers and an active region, are grown on top of each other by molecular beam epitaxy on GaAs substrates. The lasers operate at 10.4 µm and 9.1 µm wavelength and have built-in second-order intersubband nonlinearities. Due to coupling between the optical fields of the respective waveguides, not only the second-harmonic of each wavelength, but also the sum-frequency of the two lasers is measured. This concept can be extended by independently biasing the two laser stacks, whilst maintaining overlap between the two optical modes. [ABSTRACT FROM AUTHOR]

The generation of short, intense, mid-infrared laser pulses allows for the exploration of atom-laser interactions deep in the tunnelling regime as well as providing the ability to explore scaled interactions. In this paper we present recent experimental and theoretical results for this largely unexplored parameter space. [ABSTRACT FROM AUTHOR]

This paper describes an optical configuration for generating dual-focus from a single laser incident beam. The generated two foci have nearly equivalent spot size and both fall on the optical axis of the focusing optics, but at different focal lengths. The dual-focus optics allows for variations of the laser power of each focal point and the distance between the two focal points. The advantages of dual-focus ablation were demonstrated with a nanosecond UV laser dicing silicon substrates. The experimental results show that, compared to conventional single focus, dual-focus improves ablation rate by a factor of 2–4. [ABSTRACT FROM AUTHOR]

This paper discusses a diode-laser-array end-pumped (Nd:YVO[SUB4]/BIBO green laser. Using a three-mirror folded cavity (V-shaped), a 1.06 W CW green output was obtained at an incident pump power of 8.5 W; the corresponding optical conversion efficiency was 12.5%. The relationship between the green output and the temperature of the BIBO crystal was investigated. The laser damage threshold of BIBO crystal was measured to be 600 MW cm[SUP-2] and 400 MW cm[SUP-2] at 1064 nm and 532 nm, respectively. [ABSTRACT FROM AUTHOR]