共查询到20条相似文献,搜索用时 362 毫秒
1.
C. H. Zuo B. T. Zhang Y. B. Liu J. L. He H. T. Huang J. F. Yang J. L. Xu 《Laser Physics》2010,20(8):1717-1720
Using V3+:YAG crystal as the saturable absorber, a diode-pumped passively Q-switched and mode-locked Nd:GGG laser operating at 1.3
μm is realized for the first time. The mode-locking modulation depth of nearly 100% has been achieved. The maximum output
power and the single Q-switched pulse energy are 410 mW and 8.3 μJ. The mode-locked pulse inside the Q-switched pulse has
a repetition rate of 349 MHz, and its average pulse width is estimated to be about 750 ps. 相似文献
2.
By using both V3+:YAG and Co:LMA saturable absorbers, an xenon-lamp-pumped doubly passively Q-switched and mode-locked (QML) Nd:YAG laser at
1.3 μm in a straight cavity is realized for the first time. The modulation depth of QML pulse has nearly reached 100%. The
experimental results shows that the doubly passively Q-switched and mode-locked (QML) laser can generate shorter Q-switch
envelope pulse with higher average peak power in comparison to the singly passively QML laser with V3+:YAG or Co:LMA saturable absorber. 相似文献
3.
C. Theobald M. Weitz R. Knappe R. Wallenstein J.A. L’huillier 《Applied physics. B, Lasers and optics》2008,92(1):1-3
This paper reports on a passively mode-locked and Q-switched Nd:YVO4 laser generating picosecond pulses with an average output power exceeding 7 W. In a first step Q-switch mode-locking was
obtained by self Q-switching of a mode-locked oscillator with appropriate cavity design, pump power and output coupling. In
a second system the Q-switching was actively controlled and stabilized by modulating the resonator internal losses with an
acousto-optic modulator. In the Q-switch mode-locking operation the laser provided 12.8 ps long mode-locked pulses with a
repetition rate of 80 MHz. The repetition rate of the Q-switch envelope was 185 kHz. The maximum pulse energy of a single
ps pulse was 0.55 μJ which is 5.5 times the pulse energy measured for cw mode locking. The total energy of the pulses within
the Q-switch envelope was 42 μJ.
PACS 42.55.Xi; 42.60.Fc; 42.60.Gd 相似文献
4.
Fei Chen Xin Yu Xudong Li Renpeng Yan Cheng Wang Deying Chen Zhonghua Zhang Junhua Yu 《Optics Communications》2011,284(2):635-639
A high power diode-end-pumped passively Q-switched and mode-locking (QML) Nd:GdVO4 laser at 912 nm was demonstrated for the first time, to the best of our knowledge. A Z-type laser cavity with Cr4+:YAG crystals as the intracavity saturable absorber were employed in the experiments. Influence of the initial transmission (TU) of the saturable absorber on the QML laser performance was investigated. Using the TU = 95% Cr4+:YAG, as much as an average output power of 2.0 W pulsed 912 nm laser was produced at an absorbed pump power of 25.0 W, then the repetition rates of the Q-switched envelope and the mode-locking pulse were ~ 224 kHz and ~ 160 MHz, respectively. Whereas the maximum output power was reduced to 1.3 W using the TU = 90% Cr4+:YAG, we obtained a 100% modulation depth for the mode-locking pulses inside the Q-switched envelope. 相似文献
5.
L. Zhang L. Guo B. Xiong X. Yan L. Sun W. Hou X. C. Lin J. M. Li 《Laser Physics》2010,20(9):1798-1801
We report a LD side-pumped fundamental-mode (Mx2 = 1.35 and My2 = 1.27) passive Q-switched and mode-locked Nd:YAG laser based on a semiconductor saturable absorber mirror (SESAM). At a
pump current of 12.5 A, the average output power of 5.68 W with 80 kHz repetition rate and 2 μs pulse width of the Q-switched
envelope was generated. The repetition rate of the mode-locked pulse within the Q-switched envelope of 88 MHz was achieved. 相似文献
6.
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
7.
We demonstrated the first use of reflection-type single-walled carbon nanotube (RSWCNT) as a saturable absorber in the Q-switched
mode-locking (QML) of a diode pumped Tm:YAP operating at 2 μm. The spectrum of the QML laser is centered at 1.97 μm with a
broad spectral region of 36 nm. At the incident pump power of 10.33 W, as high as 432 mW average output power was produced
in QML laser. The repetition rate of the mode-locked pulse inside the Q-switched envelope was 158 MHz. The dependence of the
operational parameters on the pump power was also investigated experimentally. 相似文献
8.
Passively Q-switched output of a diode-pumped 1.34 μm Nd:GdVO4 laser was demonstrated by using Co2+:MgAl2O4(Co2+:MALO) crystal as the saturable absorber for the first time. When the transmission of output mirror is 15%, the Q-switched
pulse width is 110 ns and a corresponding average output power is 460 mW under the pump power of 9.69 W. The optical-optical
conversion efficiency is 36%. At about 330 kHz repetition rate, the single Q-switched pulse energy and the peak power are
about 1.39 μJ and 12.6 W, respectively. 相似文献
9.
H. W. Yang H. T. Huang J. L. He S. D. Liu F. Q. Liu X. Q. Yang J. L. Xu J. F. Yang B. T. Zhang 《Laser Physics》2011,21(1):66-69
The character of a diode-pumped passively Q-switched Nd:GdVO4/V3+:YAG 912 nm laser was demonstrated for the first time to our knowledge. With an absorbed pump power of 7.4 W, an average output
power of 360 mW with a Q-switched pulse width of 328 ns at a pulse repetition rate of 163 kHz was obtained. The Q-switching
efficiency was found to be 32.7%. Our work further indicated V3+:YAG could be an effective fast passive Q-switch for 0.9 μm radiation. 相似文献
10.
We fabricate a transparent glass ceramic contains magnesium-aluminum spinel nanocrystallites doped with Co2+ ions. The ground-state and excited-state absorption cross section of this glass ceramic at 1.54 μm are estimated to be (2.8
± 0.3) × 10−19 cm2 and (4.8 ± 0.5) × 10−20 cm2, respectively. For the first time, the passively Q-swithched operation of LD pumped 1.54 μm microchip Yb3+/Er3+ glass laser is realized with transparent glass ceramic as saturable absorber. The Q-switched pulses of 3.846 kHz in repetition
rate, 6.2 ns in duration and 6.3 μJ in energy are obtained. At last, the dependences of pulse width and repetition rate on
pump power are also investigated. 相似文献
11.
A passively Q-switched mode-locking of diode-pumped TmYAP laser by use of InGaAs/GaAs as a saturable absorber is reported.
The maximum Q-switched mode-locking output power was 480 mW near the wavelength range of 1.94 μm with pulse repetition frequency
of 26.47 kHz. The beam quality was also measured to be 1.12 ± 0.02. 相似文献
12.
By using both acousto-optic (AO) modulator and V3+:YAG saturable absorber, a diode-pumped doubly Q-switched a-cut Nd:GdVO4 laser at 1.34 μm is realized. The average output power and the pulse width for different AO repetition rate f have been measured.
The experimental results show that the doubly Q-switched laser can compress the pulse width and improve the pulsed peak power
in comparison to the singly Q-switched laser with AO or V3+:YAG saturable absorber. At the pump power 10.34 W and f = 10 kHz, the greatest pulse width compression ratio 72% and the highest peak power improvement 8.8 times have been obtained,
respectively. 相似文献
13.
Using a V3+:YAG saturable absorber, we realize the running of a laser-diode end-pumped passively Q-switched intracavity-frequency-doubling
Nd:GdVO4/KTP red laser. Under the absorbed pump power of 9.45 W and with V3+:YAG initial transmission T
0 = 94%, the obtained average output power and pulse width were 610 mW and 15.09 ns with the repetition rate of 12.2 kHz, corresponding
to the single pulse energy 50 μJ and the pulse peak power 3.34 kW. 相似文献
14.
L. Zhang Y. G. Wang H. J. Yu L. Sun L. Guo W. Hou J. Tang X. C. Lin J. M. Li 《Laser Physics》2011,21(3):454-458
We report a 880 nm LD pumped passive Q-switched and mode-locked Nd:YVO4 laser using a single-walled carbon nanotube saturable absorber (SWCNT-SA). At the pump power of 7.78 W, the average out-put
power of 330 mW of Q-switched and mode-locked laser with optical conversion efficiency of 4.2% was generated. The repetition
rate and pulse width of the Q-switched envelope were 33 kHz and 5.6 μs, respectively. The repetition rate and pulse energy
of the mode-locked pulse within the Q-switched envelope were 80 MHz and 4.1 nJ, respectively. 相似文献
15.
We present the performance of diode end-pumped Nd:YVO4 laser in Q-switched and Q-switched mode-locking oscillation using a single-walled carbon nanotube based saturable absorber,
which was fabricated using similar vertical evaporation technique. The average output power, repetition rate and pulse width
of the Q-switched laser output were studied with different output couplers. The maximum average output power was 130 mW. For
Q-switched mode-locking operation, the repetition rate of the mode-locked pulses concentrated in the Q-switched envelope was
58 MHz. The repetition rate of the Q-switched envelope maintained at 18 kHz, while the pulse width decreased along with the
increasing of pump power. The maximum average output power was 53 mW. 相似文献
16.
Petr A. Obraztsov Anatoliy. A. Sirotkin Elena D. Obraztsova Yuri P. Svirko Sergey V. Garnov 《Optical Review》2010,17(3):290-293
We demonstrate the passive mode-locking of a diode-pumped Nd+3:YAG (central wavelength: 1.32 μm; pulse duration: 50 ps; output energy: up to 70 μJ) laser using a polymer film containing
single-wall carbon nanotubes. The mode-locking regime is stable at a pump repetition rate of up to 1 kHz. We also investigate
the temporal evolution of the light-induced absorption change of the polymer film containing carbon nanotubes in the spectral
range of 1.3–1.5 μm by femtosecond time-resolved pump-probe measurements. The measurements reveal that light-induced transmission
exhibits fast and slow components that last 280 fs and more than 10 ps, respectively. The third-order susceptibility of the
polymer film containing single wall carbon nanotubes is as high as 10−11 esu. 相似文献
17.
We first report a tunable repetition frequency passively Q-switched 2053 nm Tm,Ho:YLF laser by tuning the tilt angle of the
Cr:ZnS saturable absorber. When the pump power is 1.4 W, the pulse repetition frequency can be tuned from 1.6 to 19.4 kHz
by changing the position of Cr2+:ZnS saturable absorber along the cavity axis. When the Cr2+:ZnS saturable absorber is near the Tm,Ho:YLF crystal, the repetition frequency can be tuned from 0.8 to 4.0 kHz by changing
the tilt angle of the Cr2+:ZnS saturable absorber, furthermore, the pulse width and the pulse energy are near constants of 1.7 μs and 3.5 μJ, respectively. 相似文献
18.
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
19.
Passively Q-switched green output with Cr4+:YAG as saturable absorber and PPMgLN as the frequency doubling crystal was realized in a compact diode end-pumped Nd:YVO4 laser. The green light output power, pulse width, pulse repetition rate, pulse energy and peak power with three Cr4+:YAG of different initial transmissions were investigated. The maximum average output power was 1.2 W at the pump power of
4.0 W and the maximum conversion efficiency was 30% with the Cr4+:YAG of 90% initial transmission. The maximum pulse energy and minimum pulse width were 10.9 μJ and 12 ns with the Cr4+:YAG of 75% initial transmission. 相似文献
20.
An xenon-lamp-pumped passively Q-switched and mode-locked (QML) Nd:YAG laser with Co:LMA saturable absorber at 1.3 μm is realized
in a straight cavity. The modulation depth of mode locking pulse has reached 100%. The pulse energy and the pulse width of
QML laser have been measured. The pulse width of the mode-locking laser is estamated to be 940 ps. 相似文献