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We provide a simple explanation for why laser media with distributed loss should have a sublinear output power characteristic. This understanding clarifies the role of long-range spatial hole burning in reducing the efficiency of semiconductor lasers, and is essential for optimizing power output.
We theoretically investigate the role of point reflector's reflectivity in the performance of forward-pumped high power random fiber lasing, and demonstrate that the maximum 1st-oder random lasing output power can even increase when the reflectivity decreases from 0.9 to 0.01.
Phosphor-free monolithic high-efficiency tunable white LEDs are realized on ternary InGaN substrates. This proof-of-concept study demonstrates that high quantum efficiency and stable white color emission are achieved by using ternary substrates and correctly-engineered device structures.
We present 1.55 μm hybrid III-V/Si SOA designs and experimentally determine wall-plug-efficiency (WPE) values for 2 mW and 0.1 mW input power amplification. Flared SOAs yield WPE = 12.1% for output power > 10 mW and straight SOAs achieve WPE = 7.2%.
We report to the best of our knowledge the highest output average power of 35W (0.35J per pulse) of Fe:ZnSe laser operating at 100 Hz repetition rate in nonselective cavity, and 23 W (0.23J per pulse) in dispersive cavity. The lasing wavelength was tuned over 3.88–4.17 μm at 77K.
A more than two-octave mid-infrared supercontinuum with an average output power of 15.6 mW covering 1.7–7.5 μm (1,333–5,900 cm−1) is generated in a low-loss As38Se62 suspended core fiber with core diameter of 4.5 μm.
We devised a new output configuration for the Si-SOA hybrid laser which is suitable for high-power operation in terms of slope efficiency and suppression of nonlinear effects in a ring resonator. These advantages were theoretically evaluated. A proof-of-concept experiment demonstrated output power of > 7 mW and tunable operation with a range of 4.8 THz.
We demonstrated a silica-based Raman all-fiber amplifier delivering as much as 14.3W of output power at a wavelength of 2147nm. The conversion efficiency for the Raman fiber amplifier was 38.5% from 1963nm to 2147nm.
All the nuclear power plants in Japan have stopped operation, but before the March 2011 tsunami 30% of the total electricity generation had been supplied by nuclear power plants. It is predicts that by 2020, penetration of the LED lighting in Japan will be more than 70%, by which we can reduce 7% of the electricity. In this presentation, current and future energy savings by GaN and related compounds...
Diode-pumped 1.9-μm Tm:KYW microchip laser with 1.6 W TEM00 cw output power operates with 72% slope efficiency relative to the absorbed pump power. Output power of 2.5 W is achieved with generation of a doughnut transverse mode. Q-switched laser operation with pulse duration of 2.2 ns at 1.5 MHz repetition rate is demonstrated.
We report a synchronously pumped 3.16 μm acetylene fiber laser based entirely on low-loss silica hollow-core fiber. Our system oscillates at 2.568 MHz repetition rate, when pumped with a modulated amplified 1.53 μm diode laser.
Power scaling of narrow-linewidth thulium-doped fiber superfluorescent source with wavelength tunable from 1940∼2010nm is reported. The all-fiber superfluorescent source yielded 364W of output power at central wavelength of 1980nm with 3dB spectral bandwidth of 1.9nm.
Mid-IR interband cascade lasers will be reviewed. Advantages include 3–6 μm spectral coverage, wallplug efficiency up to 18% when operated in cw mode at ambient temperature, and ultra-low threshold drive power.
Recent advances in high power erbium-doped fluoride fiber lasers near 2.94 μm are reviewed. Based on an all-fiber architecture, a 20 W record output power was achieved at this wavelength of interest for medical applications.
We present sub-100-fs external pulse compression and noise characterization from ultrafast multi-100-W thin disk lasers using gas-filled-Kagome-type HC-PCFs. We demonstrate high compression efficiency and excellent phase and amplitude low-noise properties.
A simple technique for selectively generating a donut-shaped LP11 mode with vortex phase front in a cladding-pumped ytterbium-doped fiber laser is reported. The laser yielded 36W of output with a slope efficiency of 74%.
A ridge waveguide laser stabilized by a compact holographic grating-cavity with an output power of 380 mW, a linewidth of 18 kHz and a nearly diffraction-limited beam for saturation spectroscopy of rubidium is presented.
Direct FDTD simulations of the Maxwell-Bloch equations coupled to Langevin noise equations are shown to quantitatively agree with a recent analytic linewidth formula and predicted scaling relations.
We present the first sub-150-fs SESAM-modelocked vertical external-cavity surface-emitting laser (VECSEL) in the 100-mW average output power regime and the first sub-300-fs modelocked integrated external-cavity surface-emitting laser (MIXSEL) with 180 mW of average output power.
A diode-pumped Q-switched Tm:KLu(WO4)2 microchip laser generated a maximum average output power of 310 mW with M2 < 1.2 at 1947 nm. The shortest pulse duration was 285 ns at a pulse repetition rate of 190 kHz.
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