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1.
We report on a diode-pumped passively continuous wave(cw) mode-locked Tm:YAP laser with a double-wall carbon nanotube(DWCNT) absorber operating at a wavelength of 2023 nm for the first time,to the best our knowledge.The DWCNT absorber is fabricated on a hydrophilic quartz substrate by using the vertical evaporation technique.The output power is as high as 375 mW.A stable pulse train with a repetition rate of 72.26 MHz is generated with a highest single pulse energy of 5.2 μJ. 相似文献
2.
We report the first demonstration, to our knowledge, of passive Q-switched mode-locking in a Tm3+:YAP laser, operating in the 2 μm broadly spectral region formed with a compact Z-flod cavity. A transmission-type single-walled carbon nanotube saturable absorber (SWCNT–SA) is used for the initiation of the pulse generation. The repetition rate of the Q-switched envelope was 60 kHz at the pump power of 8.6 W. The mode-locked pulses inside the Q-switched pulse envelope had a repetition rate of ~92 MHz. A maximum average output power of 761 mW was obtained. The dependence of the operational parameters on the pump power was also investigated experimentally. 相似文献
3.
S.M.Azooz F.Ahmad H.Ahmad S.W.Harun B.A.Hamida S.Khan A.Halder M.C.Paul M.Pal S.K.Bhadra 《中国光学快报(英文版)》2015,(3):14-17
We propose and demonstrate a passively mode-locked fiber laser operating at 1951.8 nm using a commercial thulium-doped fiber(TDF) laser, a homemade double-clad thulium–ytterbium co-doped fiber(TYDF)as the gain media, and a multi-walled carbon nanotube(MWCNT) based saturable absorber(SA). We prepare the MWCNT composite by mixing a homogeneous solution of MWCNTs with a diluted polyvinyl alcohol(PVA) polymer solution and then drying it at room temperature to form a film. The film is placed between two fiber connectors as a SA before it is integrated into a laser ring cavity. The cavity consists of a 2 m long TDF pumped by a 800 nm laser diode and a 15 m long homemade TYDF pumped by a 905 nm multimode laser diode. A stable mode-locking pulse with a repetition rate of 34.6 MHz and a pulse width of 10.79 ps is obtained when the 905 nm multimode pump power reaches 1.8–2.2 W, while the single-mode 800 nm pump power is fixed at 141.5 m W at all times. To the best of our knowledge, this is the first reported mode-locked fiber laser using a MWCNT-based SA. 相似文献
4.
We demonstrated a 2-μm passively mode-locked nanosecond fiber laser based on a MoS_2 saturable absorber(SA).Owing to the effect of nonlinear absorption in the MoS_2 SA, the pulse width decreased from 64.7 to 13.8 ns with increasing pump power from 1.10 to 1.45 W. The use of a narrow-bandwidth fiber Bragg grating resulted in a central wavelength and 3-dB spectral bandwidth of 2010.16 and 0.15 nm, respectively. Experimental results show that MoS_2 is a promising material for a 2-μm mode-locked fiber laser. 相似文献
5.
A. Braud P.Y. Tigreat J.L. Doualan R. Moncorgé 《Applied physics. B, Lasers and optics》2001,72(8):909-912
Room-temperature cw laser operation on the 3
F
4?3
H
6 transition at 1.85 μm of Tm3+ ions in a KY3F10 single crystal is reported here for the first time. Using a cw Ti:sapphire laser as a pump source, a threshold absorbed pump
power of 120 mW and a laser slope efficiency of 42.5% were achieved by using a 45% transmissive output coupler. Optimization
of the activator concentration and crystal length is discussed taking into account self-quenching and pump-absorption efficiencies
as well as parasitic and intrinsic reabsorption losses. The emission cross-section at the laser wavelength is determined using
different methods, showing that the result of the J–O approach is, in this case, very uncertain.
Received: 2 January 2001 / Revised version: 7 February 2001 / Published online: 27 April 2001 相似文献
6.
Yudi Rosandi Herbert M. Urbassek 《Applied Physics A: Materials Science & Processing》2010,101(3):509-515
The optical properties of blue-violet InGaN light-emitting diodes under normal and reversed polarizations are numerically
studied. The best light-emitting performance under normal and reversed polarization is obtained in a single quantum-well structure
and double quantum-well structure, respectively. The key factors responsible for these phenomena are presumably the carrier
concentration distribution and the amount of carriers in quantum wells. The turn-on voltage of light-emitting diodes under
reversed polarization is lower than that of light-emitting diodes under normal polarization, due mainly to lower potential
heights for electrons and holes in the active region. 相似文献
7.
The influence of the thulium ion concentration on the 1.94-??m laser performance of c-cut Tm:YAP crystal was investigated in this paper. Three crystals with 3, 4, and 5% Tm3+ (atom concentration) were examined at 18°C. Our experimental results showed that, the best power performance was obtained with the 4% Tm:YAP crystal. By using 24.8 W of incident pump power at 795 nm, a maximum of 7.5 W of output power was obtained. The slope efficiency was 48.8%, corresponding to diode-to-Tm conversion efficiency of 30.2%. 相似文献
8.
C.P. Wyss W. Lüthy H.P. Weber V.I. Vlasov Y.D. Zavartsev P.A. Studenikin A.I. Zagumennyi I.A. Shcherbakov 《Applied physics. B, Lasers and optics》1999,68(4):659-661
4 as a host for neodymium has several advantages for diode pumping in comparison with other crystals. The absorption cross
section of neodymium in GdVO4 is considerably stronger and broader than in YAG. This allows for the construction of very compact monolithical microchip
lasers. In our paper, we report for the first time on a diode-pumped monolithical Nd3+([%at.]1.3):GdVO4 microchip laser at 1.06 μm. A maximum output power of 5 W is achieved. The temporal and the spectral emission properties
are described. The beam propagation properties are studied in detail.
Received: 23 July 1998 / Revised version: 9 November 1998 / Published online: 24 February 1999 相似文献
9.
We elaborate a high-power, high-efficiency cw Tm:YAP laser dual-end-pumped by the laser diode. With 41.9?W pumping power, we obtain a maximum cw output power of 14.7?W at 1988?nm with a slope efficiency of 43.8%, corresponding to an optical conversion efficiency of 35.1%. At the maximum laser output, we measure a beam quality of M 2?~?1.9. 相似文献
10.
A liquid-nitrogen-cooled Tm, Ho:YLF laser is constructed with a 10-mm-long Tm(6%) and Ho(0.5%) co-doped yttrium lithium fluoride crystal pumped by a laser diode operating at 792 nm. The laser output power is improved by cooling the Tm, Ho:YLF crystal from 300 to 77 K. When the crystal is kept at 77 K, the laser threshold pump power is 230 mW, the slope efficiency is 27.4%, and the maximum optical-to-optical efficiency is 19.9%. At the same time, the relation between the input power and the output power at different temperatures is obtained. 相似文献
11.
We report on the first diode-pumped laser operation of thulium-doped Lu2O3. With a very compact setup an output power of 75?W and slope efficiencies of around 40% with respect to the incident pump power were achieved at room temperature. Free running laser operation was observed at wavelengths of 2065?nm and 1965?nm. With a birefringent filter the wavelength could continuously be tuned from 1922?nm to 2134?nm. The thermal conductivity of Tm:Lu2O3 was measured for different dopant concentrations and is compared to the one of thulium-doped YAG. 相似文献
12.
The scattering effect of Tm:YAG ceramic has been investigated and the scattering coefficient at 1064 nm wavelength is measured to be 0.014 cm−1. Furthermore, a high power Tm:YAG ceramic laser with a slope efficiency of 10.7% has been built, which is end-pumped at a central wavelength of 805 nm. The 2-μm maximum output power is 7.1 W with an optical-optical conversion efficiency of 7.2%. 相似文献
13.
A.V. Podlipensky K.V. Yumashev N.V. Kuleshov H.M. Kretschmann G. Huber 《Applied physics. B, Lasers and optics》2003,76(3):245-247
Spectroscopic data of a V3+:YAG passive Q-switch crystal were measured. The absorption recovery time was determined to be of 37±7 ns and the ground state
absorption cross section was estimated to be 0.7×10-18 cm2 at 1.44 μm and 3.5×10-18 cm2 at 1.34 μm. Passively Q-switched operation of diode pumped 1.44 μm and 1.3 μm Nd:YAG lasers was demonstrated using this crystal
as saturable absorber. Average output powers of 1.42 W (1.44 μm) and 1.56 W (1.34 μm) and pulse energies of 24 μJ (1.44 μm)
and 25 μJ (1.34 μm) were observed, respectively.
Received: 19 August 2002 / Published online: 12 February 2003
RID="*"
ID="*"Corresponding author. Fax: +49-40/42838-6281, E-mail: kretschmann@physnet.uni-hamburg.de 相似文献
14.
A Tm–Ho codoped fiber amplifier system is built. And, amplification of a gain-switched Tm–Ho codoped fiber laser is investigated. Average output of 300 mW is obtained at repetition rate of tens of kHz with an amplification gain bigger than 11 dB. And, pulse amplification efficiency of resonantly pumped Tm–Ho codoped single clad fiber is comparable with 793 nm pumped Tm-doped double clad fiber. The maximal pulse energy generated is about 13.1 μJ, corresponding to a peak power of 282 W at 20 kHz. During the amplification process, gain-switching, partially modulated gain-switched mode-locking and 100% modulated gain-switched mode-locking are observed sequentially. At gain-switching mode, the laser output enjoys a narrow linewidth of 0.31 nm, while at gain-switched mode-locking mode, the spectral linewidth broadens to 0.6 nm. 相似文献
15.
A tunable continuous wave (CW) low temperature operating Tm (6 at.-%),Ho (0.6 at.-%):YLF laser pumped by fiber-coupled diode laser is reported. The maximum output power is 4.16 W at 2073 nm by use of 30% output coupling, the slope efficiency is 33%. A tuning range from 2049 to 2081 nm is achieved with a birefringent filter (BF). The factors that contribute to the output power and tuning range are discussed. 相似文献
16.
Judd-Oflet analysis of spectrum and laser performance of Ho:YAP crystal end-pumped by 1.91μm Tm:YLF laser
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The Ho:YAP crystal is grown by the Czochralski technique.The room temperature polarized absorption spectra of Ho:YAP crystal was measured on a c cut sample with 1 at% holmium.According to the obtained Judd-Ofelt intensity parameters Ω2 = 1.42 × 10-20 cm2,Ω4 = 2.92 × 10-20 cm2,and Ω6 = 1.71 × 10-20 cm2,this paper calculated the fluorescence lifetime to be 6 ms for 5I7 →5 I8 transition,and the integrated emission cross section to be 2.24×10-18 cm2.It investigates the room temperature Ho:YAP laser end pumped by a 1.91 μm Tm:YLF laser.The maximum output power was 4.1 W when the incident 1.91 μm pump power was 14.4 W.The slope efficiency is 40.8%,corresponding to an optical to optical conversion efficiency of 28.4%.The Ho:YAP output wavelength was centred at 2118 nm with full width at half maximum of about 0.8 nm. 相似文献
17.
Steady state mode-locked operation of a neodymium laser operating on the 4F3/2 → 4I13/2 transition around 1.3 μm is achieved for the first time using transmitting single-walled carbon nanotube (SWCNT) saturable
absorber. The Nd:YVO4 laser cavity was optimized for large fundamental mode volume generating an average power of 0.8 W at a repetition rate of
127 MHz in a stable train of 16.5 ps long pulses. 相似文献
18.
19.
M. Okida Y. Hayashi T. Omatsu J. Hamazaki R. Morita 《Applied physics. B, Lasers and optics》2009,95(1):69-73
We directly produced for the first time a high-power 1.06 μm vortex mode from a diode-pumped Nd:GdVO4 bounce amplifier. A maximum output of 17.8 W was achieved for a pump power of 55 W. The corresponding optical efficiency
from the diode to the output was above 30%. 相似文献
20.
F. Cornacchia A. Di Lieto P. Maroni P. Minguzzi A. Toncelli M. Tonelli E. Sorokin I. Sorokina 《Applied physics. B, Lasers and optics》2001,73(3):191-194
We present the results obtained with a Ho,Tm:YLF crystal grown at a new crystal growth facility in Pisa. The optical quality
of the sample has been tested by studying its performance as the active medium of a laser operating at 2.06 μm. We employed
three different pump laser sources: a Ti:sapphire, a diode (both tuned at 793 nm) and, for the first time, a continuous-wave
Co:MgF2 laser, tuned at 1.682 μm. At room temperature the best slope efficiency was 30 % in the case of “red” pumping, and 59 % in
the case of “infrared” excitation. The typical lasing threshold is about 100 mW.
Received: 14 March 2001 / Revised version: 15 June 2001 / Published online: 19 September 2001 相似文献