共查询到20条相似文献,搜索用时 343 毫秒
1.
T. Zhao D. Y. Shen H. Chen X. F. Yang X. D. Xu D. H. Zhou J. Xu 《Laser Physics》2011,21(11):1851-1854
We describe efficient operation of a Ho:LuAG laser in-band pumped by a cladding-pumped narrow linewidth Tm fiber laser at
∼1907 nm. With 1.0 at % Ho3+-doped LuAG and an output coupler of 6% transmission, the laser had a threshold pump power of ∼0.85 W and generated 18.04
W of continuous-wave output power at 2124.5 nm for 35 W of incident pump power, corresponding to an average slope efficiency
with respect to incident pump power of 53.4%. 相似文献
2.
A wide-aperture copper vapour laser was demonstrated at ∼10 kHz rep-rate with hydrogen additive in its buffer gas. Maximum
power in excess of ∼50 W (at 10 kHz) was achieved by adding 1.96% hydrogen to the neon buffer gas at 20 mbar total gas pressure.
This increase in output power was about 70% as compared to ∼30 W achieved with pure neon at 5.5 kHz rep-rate. The 70% enhancement
achieved was significantly higher than the maximum reported value of 50% so far in the literature. The enhancement was much
higher (about 150%) as compared to its 20 W power at 10 kHz rep-rate using pure neon as the standard CVL operation. 相似文献
3.
G.D. Hager V.D. Nikolaev M.I. Svistun M.V. Zagidullin 《Applied Physics A: Materials Science & Processing》2003,77(2):325-329
Experimental results have demonstrated that the use of ejector-nozzle concepts can allow to achieve simultaneously high chemical
efficiency and high pressure recovery in a chemical oxygen iodine laser. The estimated small-signal gain of the gain medium
generated by these nozzle banks was from 0.5 to 0.8 %/cm. In laser experiments with all nozzle banks (NB-1–NB-5), Pitot pressures
of the order of 80 Torr and Mach numbers of ∼2 in the cavity-mixing chamber have been achieved. The geometry of a given ejector-nozzle
bank and gas-flow conditions affect the power extraction and chemical efficiency. The main factors for high efficiency and
high power are small mixing scale, high area for the oxygen flow, dilution of chlorine by helium, and the arrangement of nozzles.
A chemical efficiency of 25% at a power level of ∼900 W was obtained for NB-1 having the smallest mixing scale, parallel injection
of all flows, and dilution of oxygen by helium. The highest power of ∼1.2 kW with a chemical efficiency of 19.5% and 160 W/cm2 of specific output power was achieved with NB-5 having the largest area for the oxygen flow and dilution of oxygen by helium.
Received: 7 October 2002 / Accepted: 20 January 2003 / Published online: 28 May 2003
RID="*"
ID="*"Corresponding author. Fax: +7-8462/355-600, E-mail: nikolaev@fian.smr.ru 相似文献
4.
M. Wang S. Zhang Y. Tang L. Xu Y. Wang C. Zhao Y. Hang W. Chen 《Applied physics. B, Lasers and optics》2011,104(4):829-833
An efficient laser diode end-pumped continuous-wave (CW) and AO Q-switched laser of Nd:LiLuF4 crystal with dual central wavelengths of 1053.1 and 1054.7 nm is reported for the first time. The maximum CW output power
of 6.22 W was obtained at absorbed pump power of ∼14.6 W with the output transmission of 2%. The optical conversion efficiency
is ∼43%, corresponding to a slope efficiency of about 48% with respect to the absorbed pump. For the Q-switched operation,
the shortest pulse width of 17 ns was obtained at the pulse repetition frequency (PRF) of 0.5 kHz, resulting in a pulse energy
of 2.24 mJ and peak power of 131.8 kW. 相似文献
5.
Zaytsev A. K. Wang C. -L. Lin C. -H. You Y. -J. Tsai F. -H. Pan C. -L. 《Laser Physics》2012,22(2):447-450
We report the performance of a picosecond master-oscillator power amplifier (MOPA) system based on a diode-pumped solid-state
(DPSS) seed laser and Yb-doped fiber amplifier. An average power of 28 W at ∼200 MHz repetition rate is achieved by using
only one amplification stage. We found that positive nonlinear phase shift induced by nonlinear effect in the active fiber
can be effectively compensated by a grating pair. A pulse duration of ∼1.6 ps is shown after recompression. 相似文献
6.
Chengqiang Lu Mali Gong Lei Huang Fahong He 《Applied physics. B, Lasers and optics》2007,89(2-3):285-289
A high-power high-repetition-rate acousto-optically Q-switched 1342 nm laser with double Nd:YVO4 crystals pumped by fiber-coupled laser diodes is presented. The highest output power of 13.7 W was achieved with a total
of 42 W pumping power in cw operation, the slope efficiency was measured as 36%, and the optical efficiency was better than
32%. In Q-switchedoperation, the highest pulse repetition rate of 100 kHz was obtained. At 50 kHz repetition rate, the laser
exported 11.2 W average output power, with 60 ns average pulse width, ∼5% width stability (RMS) and ∼8% peak-power stability
(RMS). At 10 kHz repetition rate, the highest average output power was measured as 6.3 W, single pulse energy was calculated
as 0.63 mJ, with pulse width of 19 ns and peak-power higher than 30 kW. Combining the experimental results, we analyze and
discuss some problems concerning Nd:YVO4 crystal working at 1,342 nm wavelength.
PACS 42.55.-f; 42.55.Xi; 42.60.Gd 相似文献
7.
Q-switched operation of a room temperature Ho:YAP laser was resonantly end-pumped by a diode-pumped Tm:YLF laser at 1.91 μm.
The CW Ho:YAP laser generated 9.9 W of linearly output at 2119.03 nm with beam quality factor of M
2 ∼1.46 with respect to absorbed pump power of 19.16 W, corresponding to an optical-to-optical conversion efficiency of 51.7%
and slope efficiency of 60.6%. Under Q-switched operation, the maximum output power of 9.8 W in relation to 10 kHz pulse repetition
frequency (PRF) was obtained, however, the maximum peak power of 60 kW at the PRF of 5 kHz was demonstrated. At 5 kHz pulse
energies of 1.92 mJ with pulse width of 32 ns was achieved. 相似文献
8.
X. F. Yang D. Y. Shen T. Zhao H. Chen J. Zhou J. Li H. M. Kou Y. B. Pan 《Laser Physics》2011,21(6):1013-1016
We report on a high power polycrystalline Er:YAG ceramic laser in-band pumped by a cladding-pumped Er, Yb fiber laser wavelength
locked at 1532 nm with a volume Bragg grating. Using 1.0 at % Er3+-doped ceramic as the gain medium and an output coupler of 10% transmission, the laser had a threshold pump power of ∼1.5
W and generated 11 W of continuous-wave output at 1645 nm for 23.3 W of incident pump power at 1532 nm, corresponding to a
slope efficiency with respect to incident pump power of 51%. 相似文献
9.
X. M. Duan B. Q. Yao G. Li T. H. Wang Y. L. Ju Y. Z. Wang 《Applied physics. B, Lasers and optics》2010,99(3):465-468
A stable output, high power diode-pumped Tm: YLF laser operating at 1908 nm with FWHM line width less than 0.1 nm is reported.
Using a volume Bragg grating, 41.1 W of output with M
2∼2 under an incident pump power of 111.7 W was achieved, corresponding to an optical-to-optical conversion efficiency of 36.8%
and a slope efficiency of 43.2%. A laser wavelength shift of only 0.3 nm with the incident pump power varying from 13.1 W
to 111.7 W was observed. 相似文献
10.
V. D. Zvorykin A. O. Levchenko A. G. Molchanov I. V. Smetanin N. N. Ustinovskii 《Bulletin of the Lebedev Physics Institute》2010,37(2):60-64
The grazing mode of microwave propagation in a hollow plasma waveguide formed by ionization of atmospheric air with a small
easily ionized additive by strong UV pulses of the Garpun KrF laser (λ = 248 nm, the pulse duration and energy are ∼70 ns and ∼50 J) was experimentally demonstrated for the first time. The annular
laser beam produced a hollow tube ∼10 cm in diameter with an electron density of ∼1012 cm−3 in a plasma wall ∼1 cm thick, over whichmicrowave radiation with λ
mw
∼ 8 mm was transmitted to a distance of 60 m. Themicrowave signal transmitted by the waveguide was amplified by a factor
of 6 in comparison with propagation in free space. 相似文献
11.
R. Biswal P. K. Agrawal G. K. Mishra S. K. Dixit S. V. Nakhe 《Journal of Russian Laser Research》2012,33(4):319-335
We present for the first time a comprehensive analysis (both time resolved and time averaged) of the gas-discharge characteristics of a solid-state switch (IGBT) based on high average power (100?W class), high pulse repetition rate (16?kHz) copper?CHBr laser under various excitation conditions. We evaluate various discharge-plasma parameters such as the electrical inductance, electrical resistance, active laser-head voltage, active electrical power, pre-pulse electron density, and axial gas temperature by numerical processing of the measured laser head voltage?Ccurrent waveforms. For the first time, we evaluate fractional losses at various intermediate stages of the circuit elements as well as effective coupling for the laser excitation process during transfer of energy from the wall plug to the laser-discharge plasma. We conclude that irrespective of the capacitive storage input power (P in), a constant fraction of ~40% of P in is coupled into the laser-discharge plasma. With a low to moderate specific input power of 0.4?C0.7?kW/?, the tube produced 70?C110?W average output power at an efficiency of????3.2?C2.8%, respectively. The average laser performances at various P in are correlated to its time-resolved and average gas-discharge parameters such as the inter-pulse electron density and axial gas temperature. 相似文献
12.
A small amount of hydrogen was added to neon buffer gas in a discharge-heated gold vapor laser. It was found that the output power and efficiency of the gold-vapor laser dramatically increased. The average output power and efficiency increased as much as 60%, when 0.5–1.0 Torr of hydrogen was added to neon. Maximum average power of 8 W was obtained using a plasma tube with 30 mm00D8×100 cm active volume. 相似文献
13.
M. Eichhorn 《Applied physics. B, Lasers and optics》2008,93(4):773-778
Using high-spatial and -spectral brightness laser diodes, a resonantly pumped high-power continuous-wave (CW) Er3+:YAG laser with up to 9 W of output power could be realized. Due to the lower upconversion loss in the 0.5% Er3+-doped crystal, intrinsic efficiencies of up to 64.3% and an optimum outcoupling of ∼20% were found. The output power was
compared to quasi-three-level theory with good agreement. In an optimized cavity design a mode fill efficiency of ∼95% was
achieved. 相似文献
14.
X.P. Hu X. Wang Z. Yan H.X. Li J.L. He S.N. Zhu 《Applied physics. B, Lasers and optics》2007,86(2):265-268
High power red light was generated from a periodically-poled stoichiometric LiTaO3 (PPSLT) by single-pass frequency doubling of a diode-side-pumped, Q-switched Nd:YAG laser at 1319 nm. An average power of
2.4 W of the 660 nm red light was obtained at the fundamental power of ∼5.4 W with the conversion efficiency up to 44.4% and
with low fluctuation down to 2%. The high efficiency and stability at the red output indicate that it is a practical method
to construct a reliable compact red laser.
PACS 42.70.Mp; 42.79.Nv; 42.55.Xi 相似文献
15.
In this paper, we report two crystals Tm:YLF laser pumped by a fiber coupled diode laser with total power of 180 W at 792
nm. When the incident power reached up to 117.0 and 37.3 W of the emission wave-length at 1.91 μm was achieved. Through linear
fit, the corresponding slope efficiency of 38.5%, optical-to-optical conversion efficiency of 31.9% and the beam quality factor
of M
2 ∼ 1.1 were obtained, indicating nearly diffraction limited beam propagation. To our best knowledge, this is the best beam
quality among the reported paper results under the similar experiments. 相似文献
16.
We report a continuous-wave (CW) mid-infrared singly resonant optical parametric oscillator (SRO) based on periodically poled
MgO-doped LiNbO3 (PPMgLN) pumped by a high power, single frequency fiber laser in master oscillator-power amplifier (MOPA) configuration at
1.064 μm. Using four-mirror ring OPO cavities, at the PPMgLN’s grating period of 30.5 μm and the temperature of 23°C, we achieved
the maximum idler output power of 7.2 W at 3.4 μm when the pump power was 52.8 W. The total power-conversion efficiency from
the pump to the idler in this experiment is about 13.6%, and corresponds to ∼44% of quantum-limited performance. 相似文献
17.
The temporal characteristics of the output of a single-clad Ho3+, Pr3+-co-doped ZBLAN fibre laser pumped by a Nd:YAG laser at 1064 nm has been found to exhibit a range of cw, self pulsation and
self Q-switching output dynamics, dependent on the excitation and fibre conditions. An interpretation is considered based
on stimulated Brillouin scattering and the effect of the excited state absorption (ESA). For long fibre (∼13 m) and for uni-directional
pumping, the output was a continuous wave (cw), but for bi-directional pumping, a significant decrease in the stability of
the output is observed and the output displayed well developed self pulsations. A train of self Q-switched pulses with mean
pulse duration of 767 ns, a peak pulse power of about 2.8 W and an average power of 183 mW and with more than 80% pulse-to-pulse
stability has been observed when pumped with 4.4 W into each end of the fibre. Self pulsation phenomena are also observed
in unidirectional pumping for shorter fibre lengths of ∼9.2 m at high pump power and for 1.5 m fibre length at all pumps power.
PACS 42.55.Wd; 42.60.Gd; 42.60.Mi 相似文献
18.
A. Agnesi P. Dallocchio F. Pirzio G. Reali 《Applied physics. B, Lasers and optics》2010,98(4):737-741
A single-axial-mode, passively Q-switched (PQS) diode-pumped Nd:YAG laser, generating a diffraction-limited beam train of
≈40–60 μJ, ∼500-ps pulses with adjustable repetition rate in the range 1–10 kHz, was efficiently amplified by a single side-pumped
Nd:YVO4 bounce amplifier. After double-pass amplification, ≈1-MW pulse peak power with 577-ps duration and 545-μJ energy was achieved,
still maintaining diffraction-limited beam performance. The average output power was 5.45 W at 10 kHz, corresponding to 13%
extraction efficiency. The high brightness of this laser system seems ideal for nonlinear optics and some particular laser
processing applications. 相似文献
19.
A.?A.?Ionin Yu.?M.?Klimachev A.?Yu.?Kozlov A.?A.?Kotkov O.?A.?Romanovskii L.?V.?Seleznev D.?V.?Sinitsyn O.?V.?Kharchenko
In the present work it is demonstrated that a wideband CO laser operating at fundamental and overtone vibrational transitions
is a promising source of laser radiation for remote laser sensing of the atmosphere. A compact slab RF-discharge CO laser
has been designed. The optimal operating conditions are determined for this CO laser. In experiments, the maximum average
output laser power was ∼12 W for lasing efficiency of ∼14%. Under fixed experimental conditions, stable lasing (with fluctuations
of the output laser characteristics ≤5%) was observed during more than one hour, which suggests that we first excited the
sealed-off mode of cryogenic slab RF-discharge CO laser. The frequency-selective mode was first obtained for this laser. Wavelengths
for sensing of nitrous oxide, nitrogen dioxide, methane, formaldehyde, and some other gases on near-ground propagation paths
are determined. Our experiments and calculations confirm that this CO laser is promising for laser gas analysis.
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 76–83, November, 2008. 相似文献
20.
A c-cut Tm:YAP laser which operated at 1.94 or 1.99 μm is reported in detail. The maximum output power was 20.4 and 19.8 W at
the wavelength around 1.99 and 1.94 μm, corresponding to the slope efficiency of 34.3 and 31.5%, respectively. For 1.94 μm
operation, with an F-P etalon inserted in the cavity, the output central wavelength was stable around 1.94 μm with about 0.15
nm linewidth. The beam quality factor M
2 was measured to be ∼1.8 for 1.99 μm and ∼1.9 for 1.94 μm. 相似文献