منابع مشابه
Parasitic lasing suppression in high gain femtosecond petawatt Ti:sapphire amplifier.
New parasitic lasing suppression techniques are developed and high gain amplification is demonstrated in a petawatt level Ti:sapphire amplifier based on the chirped pulse amplification (CPA) scheme. Cladding the large aperture Ti:sapphire with refractive-index matched liquid doped with absorber suppresses the transverse lasing. The acousto-optic programmable dispersive filter (AOPDF) is used to...
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It is well known that an amplifying medium embedded in an optical cavity, i.e., a laser oscillator, can emit coherent electromagnetic radiation when the gain coefficient of photons in the medium reaches a threshold value that balances the light leakage out of the cavity [1]. The emitted radiation escapes from the cavity in the form of outgoing monochromatic waves, usually along preferred spatia...
متن کاملLow-threshold bidirectional air lasing.
Air lasing refers to the remote optical pumping of the constituents of ambient air that results in a directional laserlike emission from the pumped region. Intense current investigations of this concept are motivated by the potential applications in remote atmospheric sensing. Different approaches to air lasing are being investigated, but, so far, only the approach based on dissociation and res...
متن کاملOptical gain in DNA-DCM for lasing in photonic materials.
We present a detailed study of the gain length in an active medium obtained by doping of DNA strands with 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran dye molecules. The superior thermal stability of the composite and its low quenching permit one to obtain an optical gain coefficient larger than 300 cm(-1). We also demonstrate that such an active material is feasible for the...
متن کاملLasing in a gain-guided index antiguided fiber
fiber with a cladding index of refraction larger than that f the core is an index antiguiding (IAG) fiber. In such a ber total internal reflection at the core–cladding interace does not take place. Light generated in the core of the ber can leak out into the cladding of an IAG fiber, though t experiences some guiding by grazing angle reflection. here is some loss on each reflection, but if ther...
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ژورنال
عنوان ژورنال: Science
سال: 2011
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.1199492