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1.
By using a-cut Nd:Lu0.15Y0.85VO4 mixed crystal as laser gain medium, a diode-pumped passively Q-switched and mode-locked (QML) laser with a GaAs saturable
absorber in a Z-type folded cavity is demonstrated for the first time. The Q-switched mode-locked laser pulses with about 90% modulation
depth are obtained as long as the pump power reached the oscillation threshold. The repetition rate of the passively Q-switched
pulse envelope ranges from 50 to 186 kHz as the pump power increases from 0.915 to 6.520 W. Under an incident pump power of
6.52 W, the QML pulses with the largest average output power of 694 mW, the shortest pulse width of 200 ns and the highest
pulse energy of 3.73 μJ are obtained. The mode-locked pulse width inside the Q-switched envelope is estimated to be about
275 ps. The experimental results show that Nd:Lu0.15Y0.85VO4 is a promising mixed crystal for QML laser. 相似文献
2.
A diode-pumped passively Q-switched mode-locked (QML) intracavity frequency-doubled Nd:GdVO4/KTP green laser with a semiconductor saturable absorber is presented. Nearly 100% modulation depth for the mode-locked green pulses can be achieved at any pump power over 1.92 W. The width of the mode-locked green pulse was estimated to be about 150 ps. The mode-locked pulse interval within the Q-switched envelope of 320 ns and the repetition rate of 97.5 kHz were obtained, at an incident pump power of 4.4 W. The repetition rate of the mode-locked green pulses inside the Q-switched envelope was 140 MHz. 相似文献
3.
Ji-ying Peng Bao-shan Wang Yong-gang Wang Jie-guang Miao Hui-ming Tan Long-sheng Qian Xiao-yu Ma 《Optics & Laser Technology》2008,40(2):243-246
We have demonstrated a passively Q-switched and mode-locked Nd:YVO4 laser with an intracavity composite semiconductor saturable absorber (ICSSA). Stable Q-switched and mode-locked pulses with Q-switched envelope pulse duration of 180 ns and pulse repetition rate of 72 KHz have been obtained. The maximum average output power was 1.45 W at 8 W incident pump power. The repetition rate of the mode-locked pulses inside the Q-switched envelope was 154 MHz. Experimental results revealed that this ICSSA was suitable for Q-switched and mode-locked solid-state lasers. 相似文献
4.
Zunshi Qu Yonggang Wang Jie Liu Lihe Zheng Liangbi Su Jun Xu 《Applied physics. B, Lasers and optics》2012,109(1):143-147
We demonstrated the first use of carbon nanotube as a saturable absorber in the Q-switched and Q-switched mode-locking of a diode pumped Tm:YAP operating at 2 μm. At the incident pump power of 8.64 W, the minimum Q-switched pulse width of 255.1 ns, and the maximum peak power 53.1 W can be obtained with the corresponding repetition rate of 21.76 kHz. The performance of a diode-pumped passively Q-switched mode-locked Tm:YAP laser with high repetition rate formed with a folded cavity. As high as 780 mW average output power was produced in QML laser. The repetition rate of the mode-locked pulse inside the Q-switched envelope was 244.1 MHz. The dependence of the operational parameters on the pump power was also investigated experimentally. 相似文献
5.
A diode-pumped passively Q-switched and mode-locked Nd:GdVO4 laser at 1.34 μm with V3+:YAG as the saturable absorber is realized in a V-type folded cavity. About 100% modulation depth of mode locking can be obtained as long as the pump power reaches the oscillation threshold. The width of the mode-locked pulse is estimated to be less than 280 ps with 200 MHz repetition rate within an about 980 ns-long Q-switched pulse envelope. A maximum output power of 200 mW and Q-switched pulse energy of 5.7 μJ is obtained. 相似文献
6.
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
7.
S. P. Ng D. Y. Tang J. Kong L. J. Qin X. L. Meng Z. J. Xiong 《Applied physics. B, Lasers and optics》2005,81(4):511-515
We report on a diode-pumped passively mode-locked Nd:Gd0.64Y0.36VO4 laser with a Cr4+:YAG saturable absorber. Q-switched mode locking (QML) with 90% modulation depth was obtained. The peak power of the mode-locked pulse near the maximum of the Q-switched envelope was estimated to be about 1.7 MW at the pump power of 12 W. Besides QML, continuous-wave mode locking was also experimentally realized, for the first time to our knowledge, in the laser under a strong intracavity pulse energy fluence. The mode-locked pulse width is about 2.96 ps at a repetition rate of 161.3 MHz. 相似文献
8.
Rui-Hua Wang Xiu-Wei Fan Hai-Xia Wang Hai-Tao Huang Li Zhu Jing-Liang He 《Laser Physics》2009,19(9):1882-1885
The generation of passively Q-switched mode-locking (QML) pulse has been obtained from a diode-pumped Nd:GdVO4 laser with a LT-InGaAs wafer as saturable absorber as well as output coupler. Under the incident pump power of 10 W, an average
output power of QML was 1.8 W with a Q-switched repetition rate of 280 kHz. The pulse duration of Q-switched pulse is about
160 ns and mode-locked pulse within the Q-switched envelope had a repetition rate of 410 MHz. It is indicated that the present
LT-InGaAs is a very promising device in the field of mode locking solid-state laser, and we are sure that it will be complete
pure cw mode locking with single beam output easily after further optimizing in the parameter such as saturation fluence,
modulation depth, recovery time and damage threshold in semiconductors. 相似文献
9.
L. Zhang Y. G. Wang H. J. Yu W. Sun Z. H. Han S. B. Zhang W. Hou X. C. Lin J. M. Li J. Tang 《Laser Physics》2012,22(1):133-136
We report on a passively Q-switched and mode-locked Nd:YVO4 laser using a novel low-cost wall-paper graphene oxide absorber. Sandwich structured wallpaper graphene oxide absorber was
constructed by a high transmission mirror, a piece of wallpaper graphene oxide absorber and a reflective mirror. The average
output power of 310 mW of passively Q-switched and mode-locked laser was successfully achieved. The repetition rate and pulse
width of the Q-switched envelope were 213 kHz and 770 ns, respectively. The repetition rate of passively mode-locked pulse
within the Q-switched envelope was 81.3 MHz with the pulse energy of 3.8 nJ. 相似文献
10.
We demonstrated a diode-pumped passively Q-switched mode-locked Nd:YVO4 laser by using a relaxed saturable Bragg reflector (SBR). Stable mode-locked pulse train with the repetition rate of ~230 MHz was achieved and the pulse train was modulated by the Q-switched envelope with the repetition rate of ~150 kHz. The maximum output of 4 W was obtained under the pump power of 13.5 W. The optical-to-optical efficiency was 30%. We also discussed the transition of each process having emerged. 相似文献
11.
We have demonstrated an efficient and compact passively Q-switched and mode-locked (QML) 1064 nm Nd:YVO4 laser by using a low temperature grown GaAs (LT-GaAs) saturable absorber as well as an output coupler. Stable QML with envelope duration as short as 10 ns and Q-switched repetition rate of 36 kHz was obtained. It is the shortest envelope duration as far as we know, and it is so short that it can be used as Q-switching pulses directly. At 6.9 W of the incident pump power, average output power of 1.24 W was achieved and the corresponding peak power and energy of a single Q-switched pulse were 3.44 kW and 34.4 μJ, respectively. The mode-locked pulses inside the Q-switched pulse envelope had a repetition rate of 780 MHz. 相似文献
12.
A diode-pumped passively mode-locked Nd:YVO4 laser with a five-mirror folded cavity is presented by using a semiconductor saturable absorber mirror (SESAM). The temperature distribution and thermal lensing in laser medium are numerically analyzed to design a special cavity which can keep the power density on SESAM under its damage threshold. Both the Q-switched and continuous-wave mode-locked operation are experimentally realized. The maximum average output power of 8.94 W with a 9.3 ps pulse width at a repetition rate of 111 MHz is obtained under a pump power of 24 W, correspondingly the optical slope efficiency is 39.2%. 相似文献
13.
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
14.
We have demonstrated passively Q-switched mode-locked all-solid-state Nd:YLF laser with an uncoated GaAs wafer as saturable absorber and output mirror simultaneously. Q-switched mode-locking pulses laser with about 100% modulation depth were obtained. The average output power is 890 mW at the incident pump power of 5.76 W, corresponding to an optical slop efficiency of 20%. The temporal duration of mode-locked pulses was about 21 ps. At the Q-switched repetition rate of 30 kHz, the energy and peak power of a single pulse near the maximum of the Q-switched envelope was estimated to be about 1.6 μJ and 76 kW. 相似文献
15.
We have demonstrated passively Q-switched mode-locking in a laser-diode-pumped Nd:GdVO4 laser with an intracavity Cr4+:YAG saturable absorber. At a pump power of 19.4 W, the Q-switched mode-locked laser produced an average output power of 3.22 W, and the repetition rates of the Q-switched envelope and the mode-locked laser pulse were 227 kHz and 144 MHz, respectively. The duration of the mode-locked pulse was within the sub-nanosecond range. PACS 42.55.Xi; 42.60.Fc; 42.60.Gd; 42.55.Rz 相似文献
16.
J. Y. Peng H. M. Tan Y. G. Wang B. S. Wang J. G. Miao L. S. Qian X. Y. Ma 《Laser Physics》2006,16(12):1601-1604
By using a composite semiconductor absorber and an output coupler, we demonstrated a Q-switched and mode-locked diode-pumped microchip Nd:YVO4 laser. With a 350-μm-thick crystal, the width of the Q-switched envelope was as short as 12 ns; the repetition rate of the mode-locked pulses inside the Q-switched pulse was more than 10 GHz. The average output power was 335 mW at a maximum pump power of 1.6 W. Q-switched envelope widths of 21 and 31 ns were also achieved with crystals 0.7 and 1.0 mm thick, respectively. 相似文献
17.
A laser diode directly end-pumped, passively Q-switched Nd:YVO4/Cr:YAG laser is presented in this paper. With 600 mW incident pump laser, Q-switched 1064 nm laser with an average power of 138 mW, pulse width of 19.8 ns, repetition rate of 170.1 kHz and peak power of 40.96 W is obtained. When a KTP crystal was inserted into the cavity, Q-switched 532 nm laser with an average power of 56 mW, pulse width of 28.4 ns, repetition rate of 118.2 kHz and peak power of 16.7 W is obtained at last. 相似文献
18.
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
19.
L. Zhang Y. G. Wang H. J. Yu S. B. Zhang W. Hou X. C. Lin J. M. Li 《Laser Physics》2011,21(12):2072-2075
We report on a passively mode-locked Nd:YVO4 laser using a novel graphene oxide saturable absorber fabricated by vertical evaporation method. An 880 nm LD pump source
was used to reduce the thermal load of the laser crystal. At the pump power of 7.4 W, 1.2 W average output power of continuous
wave mode-locked laser with optical conversion efficiency of 16.2% was achieved. To the best of our knowledge, this is the
highest output power of passively mode-locked solid-state laser using graphene oxide saturable absorber. The repetition rate
of passively mode-locked pulse was 88 MHz with the pulse energy of 13.6 nJ. 相似文献