Volume free electron laser uses volume distributed feedback (VDFB), which can essentially reduce the threshold current of generation and provides the possibility of smooth frequency tuning. An undulator VFEL is considered.

Articles you may be interested in Plasmonic lens enhanced mid-infrared quantum cascade detector Appl. A surface-emitting distributed-feedback plasmonic laser Appl. High-performance operation of single-mode terahertz quantum cascade lasers with metallic gratings Appl.

Laser diodes, in general, are sensitive to optical feedback, especially with regard maintaining single-frequency operation. Until now, however, the feedback sensitivity of high-power devices such as distributed Bragg reflector (DBR) tapered laser diodes has not been investigated quantitative detail. In this paper, we analyze impact very weak between <mml:math xmlns:mml="http://www.w3.org/1998/M...

We report an organic solid-state distributed feedback laser consisting of an organic active layer and a Bragg grating without morphological change. The active layer consists of 4-~dicyanomethylene!-2-methyl-6-~4-dimethylaminostryl!-4H-pyran as a laser dye, tris~8hydroxyquinoline! aluminum as a host, and poly~methyl methacrylate! as a binder. The threshold and linewidth of the laser are 400 mJ/c...

A very compact explosive vapor sensor is demonstrated based on a distributed feedback polymer laser pumped by a commercial InGaN light-emitting diode. The laser shows a two-stage turn on of the laser emission, for pulsed drive currents above 15.7 A. The 'double-threshold' phenomenon is attributed to the slow rise of the ∼30 ns duration LED pump pulses. The laser emits a 533 nm pulsed output bea...

Organic solid state lasers have attracted considerable attentions because they have the potential to be tunable, flexible, biocompatible, and easily integrated into plastic optoelectronics.[1–8] Optically pumped laser has been reported in a very broad range of conjugated polymers and oligomers. However, for the electrically pumped organic lasers, there still exist many challenging problems to b...

First investigations of photoacoustic (PA) spectroscopy (PAS) of methane using an antimonide semiconductor laser are reported. The laser fabrication is made in two steps. The structure is firstly grown by molecular beam epitaxy, then a metallic distributed-feedback (DFB) grating is processed. The laser operates at 2371.6 nm in continuous wave and at room temperature. It demonstrates single-mode...

We demonstrate a two-directional tuning method of distributed feedback (DFB) film dye laser devices to achieve high quality lasing and a large tuning range. In this work, we proposed a simple method to fabricate a continuous tunable solid-state dye laser on a flexible Polydimethylsiloxane (PDMS) film. In order to obtain stable and tunable output lasing, the stretching property of the gelatine h...

Random distributed feedback fibre lasers belong to the class of random lasers, where the feedback is provided by amplified Rayleigh scattering on sub-micron refractive index inhomogenities randomly distributed over the fibre length. Despite the elastic nature of Rayleigh scattering, the feedback mechanism has been insofar deemed incoherent, which corresponds to the commonly observed smooth gene...