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Pump Power (pump + power)
Selected AbstractsContinuous wave and passively Q-switched laser performance of the mixed crystal Nd:Lu0.15Y0.85VO4LASER PHYSICS LETTERS, Issue 5 2010S. Zhang Abstract Laser characteristics of a novel mixed laser crystal Nd:Lu0.15Y0.85VO4 was investigated. It is attractive for Q-switching with high repetition rate and short pulse width due to its suitable stimulated emission cross-section and short upper level lifetime. Continuous wave (CW) output power of 8.18 W was obtained at the pump power of 18.9 W, corresponding to the optical conversion efficiency of 43.3% and the slope efficiency of 47%. In the passive Q-switching operation, the minimum pulse width attained was 7.8 ns, with the pulse repetition frequency of 23.2 kHz, with the single pulse energy and peak power estimated to be 94.8 ,J and 12.2 kW, respectively. (© 2010 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source] 8.5 W room temperature continuous wave operation of a Ho:LuAG laserLASER PHYSICS LETTERS, Issue 12 2009X.M. Duan Abstract We report the continuous wave Ho:LuAG laser operated at room temperature. Using the diode-pumped Tm:YLF laser as a pumping source, maximum output power of 8.5 W at 2100 nm was obtained under the incident pump power of 18.4 W, corresponding to a slope efficiency of 51.3% and a conversion efficiency of 46.2%. (© 2009 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source] Diode-pumped passively Q-switching mode-locked Nd:Gd0.5Y0.5VO4/V3+:YAG laser at 1.34, mLASER PHYSICS LETTERS, Issue 11 2009H.-T. Huang Abstract A diode-pumped passively Q-switching mode-locked Nd:Gd0.5Y0.5VO4 laser at 1.34 , m using V3+:YAG as the saturable absorber has been demonstrated for the first time to the best of our knowledge. At the pump power of 7 W, the maximum average output power of 0.83 W and Q-switched pulse repetition rate of 140 kHz were obtained with absorber's initial transmission of 96%, with the corresponding Q-switched pulse energy estimated to be 6 , J. The duration of mode-locked pulse within Q-switched envelop was estimated to be 750 ps with 333.3 MHz repetition rate. (© 2009 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source] Diode-pumped doubly passively Q-switched Nd:LuVO4 laser with Cr4+:YAG saturable absorber and GaAs output couplerLASER PHYSICS LETTERS, Issue 10 2009K. Cheng Abstract A diode-pumped doubly passively Q-switched Nd:LuVO4 laser with Cr4+:YAG saturable absorber and GaAs output coupler is realized. This laser can generate a shorter and more symmetric pulse profile when compared with pure GaAs. By using two Cr4+:YAG saturable absorbers with different small-signal transmissions T0 = 0.71 and T0 = 0.81, the maximum average output power are 1.15 W and 1.31 W at the incident pump power of 11.23 W, corresponding to optical conversion efficiencies of 10.2% and 11.7%. At the same incident pump power, the minimum pulse widths of 4.18 ns and 5.42 ns can be obtained at T0 = 0.71 and T0 = 0.81, respectively. The pulse repetition rate and the single-pulse peak power of the laser are also measured. (© 2009 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source] Laser properties of continuous-grown GdVO4/Nd:GdVO4 composite crystalLASER PHYSICS LETTERS, Issue 9 2009X.D. Li Abstract Effective CW and A-O Q-switched laser operations were demonstrated firstly using a continuous-grown GdVO4/Nd:GdVO4 composite rod. A maximum CW output power of 19.2Wwas obtained with the slope efficiency of 79.6% and the maximum optical-optical efficiency of 73.0% to absorbed pump power. In A-O Q-switched operation, the pulse width of 15.0 ns, 10.6 ns, and 6.9 ns, the peak power of about 11.3 kW, 29.6 kW, and 130.4 kW were achieved at the repetition rate of 100 kHz, 50 kHz, and 10 kHz, respectively. (© 2009 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source] Diode-pumped passively mode-locked Yb3+ -doped yttrium lanthanum oxide ceramic laserLASER PHYSICS LETTERS, Issue 8 2009W. Li Abstract A diode-pumped picosecond laser was demonstrated with Yb3+ -doped yttrium lanthanum oxide transparent laser ceramic Yb:(Y1,xLax)2O3 (x = 0.1), which was fabricated with nanopowders and sintered in H2 atmosphere. Passive modelocking was realized for the first time to our knowledge with a semiconductor saturable absorber mirror, generating pulses of 174 ps at the central wavelength 1032.5 nm with the average output power 162 mW under a diode-laser pump power of 3.2 W. (© 2009 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source] Investigation on the effect of stimulated Raman scattering in remotely-pumped L-band erbium-doped fiber amplifierLASER PHYSICS LETTERS, Issue 8 2009M.H. Abu Bakar Abstract The effect of stimulated Raman scattering (SRS) in remote pumping scheme for L-band erbium-doped fiber amplifier (EDFA) was studied in this experiment. Observation was done on the gain and noise figure performance as well as the Raman distributed gains of the remotely-pumped L-band erbium-doped fiber amplifier with the existence of SRS. The utilization of SRS effect as a secondary pump for L-band EDFA demonstrated improvements over single pump EDFA at low pump power due to the additional power from the generated C-band stimulated Raman scattering or SRS. Nevertheless, the augmentation of the Cband SRS power as the pump was increased, caused gain competition with the L-band signal which ultimately affected the performance of the L-band EDFA. The Raman distributed gain was also influenced by the C-band SRS existence, which saw declining L-band gains as the C-band SRS rose and then improved values once the C-band SRS is saturated. (© 2009 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source] Parallel-type C+L band hybrid amplifier pumped by 1480 nm laser diodesLASER PHYSICS LETTERS, Issue 7 2008S.-K. Liaw Abstract A parallel-type, dispersion compensating C+L band erbium-doped fiber amplifier/Raman fiber amplifier is constructed by sharing a common 1480-nm pump source. The gain spectra of C+L band are flattened by optimally dividing the pump power ratio to 1:29 for EDFA and RFA, respectively. In a signal input power of ,20 dBm, the average gain is 14 dB for the C-band EDFA and 13.6 dB for the L-band RFA when a pump reflector is used to recycle the residual pump power in L-band. The noise figure value ranges from 4.6 to 6.5 dB and the polarization dependent gain is less than 0.14 dB. (© 2008 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source] Actively Q-switched, diode pumped thulium laserLASER PHYSICS LETTERS, Issue 12 2007J.K. Jabczynski Abstract 6 W of output power and near 50% slope efficiency with respect to absorbed pump power was demonstrated in freerunning mode for a short, 40-mm long resonator. The uncoated, with 3.5% dopant of thulium YLF rod of.3× 8 mm size wrapped with indium foil was mounted in copper heat-sink maintaining 293 K temperature of coolant water and inserted in a short, 40-mm long resonator. For pumping the fiber coupled (0.4 mm core diameter) laser diode bar at 792-nm wavelength was deployed. The fused silica acousto-optic modulator with above 80% diffraction efficiency for 25-W power of RF was taken as the Q-switch for such a laser. In the best case of Qswitching mode up to 2-mJ output energy with 20-ns pulse duration corresponding to 100-kW peak power was demonstrated for rep. rate of a few Hz. Emission wavelength was around 1904 nm for both free-running and Q-switching regimes. (© 2007 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source] A c-cut Nd:GdVO4 solid-state laser passively Q-switched with Co2+:LaMgAl11O19 lasing at 1.34 µmLASER PHYSICS LETTERS, Issue 8 2007H.-J. Qi Abstract We investigated a high power diode-laser pumped passively Q-switched c-cut Nd:GdVO4 solid-state laser, lasing at 1.34 µm, with a Co2+:LaMgAl11O19 saturable absorber. With the optimum output coupler transmission T = 5.5% and pump power of 11.5 W, the static output power of 3.01 W was obtained. The passively Q-switching operation with Co:LMA (initial transmission T0 = 90%) as saturable absorber, shows that the shortest output pulse width, the highest output power, the highest pulse repetition and the highest pulse peak power were 32 ns, 266 mW, 277 kHz, and 187 W, respectively. (© 2007 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source] Bidirectional operation and gyroscopic properties of passively mode-locked Nd:YVO4 ring laserLASER PHYSICS LETTERS, Issue 3 2007Y. Liu Abstract A simple LD-end-pumped, passively mode-locked Nd:YVO4 ring laser with bidirectional outputs was demonstrated, and the gyroscopic properties of the ring laser was studied. The laser was continuous wave mode-locked by use of a semiconductor saturable absorber mirror (SESAM), and both clockwise and counter-clockwise outputs are stable laser pulse trains with pulse duration of 64 ps. The continuous wave modelocking was obtained under pump power as low as 540 mW. The average output power is 50 mW for the counter-clockwise laser and 52 mW for the clockwise laser under pump power of 1378 mW. The whole slope efficiency of the ring laser is about 9.4%. The two output pulse trains of the ring laser were combined to study its gyroscopic properties. The beat frequency of the pulsed solid-state laser gyro versus the rotation rates follows the Sagnac formula. The laser gyro has a large dead band of 6 , 8 dec/s, which was believed to be caused by the long pulse duration and the colliding of the opposite pulses on the SESAM. (© 2007 by Astro, Ltd. Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) (© 2007 by Astro, Ltd. Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source] Set temperature dependence of fractional thermal loading and effective stimulated emission cross section of a diode double end pumped TEM00 Nd:YAG laser for micromachining applicationLASER PHYSICS LETTERS, Issue 5 2006S. K. Sudheer Abstract We discuss the set temperature dependence of fractional thermal loading and effective stimulated emission cross section of an efficient, diode double end -pumped Nd:YAG laser using two 30 W pump diodes with a CW output power greater than 8 W in polarized TEM00 mode near-diffraction limited beam suitable for micromachining applications of ultra hard materials like diamond. The temperature dependence of effective stimulated emission cross section for 4F3/2 , 4I11/2 transition and fractional thermal loading of Nd:YAG are determined where the pump power induced thermal lensing is used to make the cavity stable and in thermally stabilized solid state lasers the cavity parameters change dynamically with the pump power and hence the overlap integrals become a function of absorbed pump power. It is observed that the fractional thermal loading is increasing with increase in set temperature of laser crystal and effective stimulated emission cross section is increasing almost linearly with the increase in set temperature of laser crystal and pump laser diodes up to 30 °C the rated value of the pump diodes and thereafter the cross section decreases with increase in temperature. (© 2006 by Astro, Ltd. Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source] Multiwavelength source based on SOA and EDFA in a ring-cavity resonatorMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2009S. Shahi Abstract A multiwavelength source incorporating a semiconductor optical amplifier (SOA) and a erbium-doped fiber amplifier (EDFA) in a ring-cavity configuration was demonstrated. The multiwavelength source was able to generate more than 13 channels at ,27 dBm and above at a SOA bias current of 300 mA and 980-nm pump power of 92 mW. The number of wavelengths generated can be controlled by adjusting the birefringence of the ring cavity using the polarization controllers. The proposed laser has constant channel spacing of 0.8 nm, which is suitable for communication and sensing applications, and shows stable operation at room temperature. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 110,113, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23970 [source] Single-mode pumping scheme for EDFA with high-power conversion efficiency using a 980-NM Ti:S laserMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2006M. A. Mahdi Abstract In this paper, we demonstrate a high-power erbium-doped fiber amplifier pumped by single-mode titanium sapphire (Ti:S) laser at 980 nm. The highest output power of 22.6 dBm is measured at 1549 nm with an input signal power of 4 dBm and a pump power of 300 mW. This corresponds to power-conversion efficiency (PCE) of 60%, providing 95% quantum efficiency. The experimental results show the feasibility of using a single-mode laser from a high-power semiconductor chip to produce high-efficiency booster amplifiers. © Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 71,74, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21264 [source] Gain characteristics and lasing of Ga(NAsP) multi-quantum well structuresPHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 2 2009C. Lange Abstract Lasing is demonstrated for a Ga(NAsP) multi quantumwell structure grown pseudomorphically on GaP using metal-organic vapour-phase epitaxy. For a series of temperatures ranging from 8 K to 290 K, the sample emission characteristics are determined. With increasing pump power, a spectral narrowing of the emitted light along with a blue-shift is observed as the lasing threshold is approached. Above the threshold, the emission splits up spectrally into a pattern of clearly distinguishable modes. In addition, the potential of this material concerning roomtemperature lasing is investigated by means of a variable stripe-length experiment, where a modal gain of 10 cm,1 is observed. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Enhanced Q-switched distributed feedback fiber laser based on acoustic pulsesLASER PHYSICS LETTERS, Issue 2 2009M. Delgado-Pinar Abstract An acoustically Q-switched distributed feedback fiber laser with enhanced performance is presented. It is based on an FBG written in an erbium doped fiber, in which a dynamic defect is introduced by means of a short acoustic pulse. The performance of the laser depends on the reflectivity of the grating. In this work, we present two different Q-switched distributed feedback fiber lasers realized with active gratings of different reflectivities. Both lasers are characterized at different pump powers and repetition rates. It is shown that the performance of the laser based on the weaker grating was significantly improved with respect to the laser based on the stronger grating. In terms of peak power, the improvement was a factor of two. The average power was also improved. For example, at 50 kHz, it was increased from 280 , W up to 500 , W. In addition, we studied the performance of the laser when an electric square signal was used to drive the transducer, obtaining similar results to the case when a harmonic electric pulse was used. (© 2009 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source] | ||||||||||