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Signal beam
About: Signal beam is a research topic. Over the lifetime, 1881 publications have been published within this topic receiving 20717 citations.
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TL;DR: In this article, the effect of resonator length on ZnGeP2 doubly resonant optical parametric oscillator was reported, and it was shown that there are obvious peaks of the output power when the resonator lengths are matched to the length of the pump source.
Abstract: The effect of resonator length on ZnGeP2 doubly resonant optical parametric oscillator was reported in this letter. With the employment of a Tm,Ho:GdVO4 laser as the pump source at 2.05 μm, we have found that there are obvious peaks of the output power when the resonator lengths are matched to the length of the pump source. The ZGP OPO can generate a maximum output power of 4.27 W at 3.80 μm signal and 4.45 μm idler when the resonator length matches that of the pump source.
13 citations
Patent•
07 Jun 1995TL;DR: In this article, a fiber-optic amplifier with reduced noise characteristics is provided, where a polarization beam splitter/recombiner splits an input signal beam into two orthogonally polarized optical signals and recombines the separately treated signals.
Abstract: A fiber-optic amplifier with reduced noise characteristics is provided. A polarization beam splitter/recombiner splits an input signal beam into two orthogonally polarized optical signals and recombines the separately treated signals. A phase controller compensates for optical path differences that result from dividing the input signal beam into two different paths. A wavelength division multiplexing coupler couples a pump laser beam with the input signal beam. A polarization maintained doped optical fiber amplifies the split optical signals while maintaining their original states of polarization. A linear polarizer rejects from each amplified split optical signal the noise with polarization orthogonal to the amplified signal. By suppressing such noise power, a portion of amplified spontaneous emission with polarization orthogonal to the signal is suppressed, thereby reducing the total output noise power.
13 citations
TL;DR: This design is an efficient and simple method for generating tunable visible picose Cond pulses that are synchronized to the femtosecond pulses.
Abstract: Narrow-bandwidth (~27 cm−1) tunable picosecond pulses from 480 nm-780 nm were generated from the output of a 1 kHz femtosecond titanium:sapphire laser system using a type I noncollinear optical parametric amplifier (NOPA) with chirped second-harmonic generation (SHG) pumping Unlike a femtosecond NOPA, this system utilizes a broadband pump beam, the chirped 400 nm SHG of the Ti:sapphire fundamental, to amplify a monochromatic signal beam (spectrally-filtered output of a type II collinear OPA) Optimum geometric conditions for simultaneous phase- and group-velocity matching were calculated in the visible spectrum This design is an efficient and simple method for generating tunable visible picosecond pulses that are synchronized to the femtosecond pulses
13 citations
TL;DR: A liquid crystal light valve operating in the infrared is demonstrated and the interaction of signal and pump waves is studied for different applied voltages, grating spacings, and intensities of the recording beams.
Abstract: A liquid crystal light valve (LCLV) is an optically controlled spatial light modulator that allows recording of dynamic holograms. Almost all known LCLVs operate in the visible range of the spectrum. In the present work we demonstrate a LCLV operating in the infrared. The interaction of signal and pump waves is studied for different applied voltages, grating spacings, and intensities of the recording beams. A fourfold amplification of the weak signal beam is achieved. The amplitude of the refractive index modulation Δn=0.007 and nonlinear coupling constant n2=−1 cm2/W are estimated from the experimental results. External phase modulation of one of the recording beams is used for a further transient increase of the signal beam gain.
13 citations
TL;DR: In this paper, the beam efficiency of a gyromonotron working at the s-th harmonic of the cyclotron frequency has been analyzed and the results of this calculation using efficiency optimized parameters are given for different TEmn distributions and also for a magnetic taper.
Abstract: A method is presented which allows to calculate the large signal beam efficiency of a gyromonotron working at the s-th harmonic of the cyclotron frequency. The results of this calculation using efficiency optimized parameters are given for different TEmn distributions and also for a magnetic taper. It is shown that beam efficiencies, which are higher than twice the value at constant electric and magnetic fields are theoretically possible. Also the influence of the beam voltage is considered. For a given beam voltage and a given electric field distribution in the resonator power calculations are performed and it is shown what powerlevels are available for different resonator modes and for different cyclotron harmonics.
13 citations