共查询到20条相似文献,搜索用时 15 毫秒
1.
A diode-pumped doubly passively Q-switched intracavity-frequency-doubling Nd:LuVO4/KTP green laser with Cr4+:YAG and GaAs saturable absorbers is demonstrated. This laser can generate the shorter pulse width with higher peak power compared with the singly passively Q-switched green laser with Cr4+:YAG or GaAs saturable absorber. The relations between the pulse symmetry and the ratio of the small-signal transmissions of two saturable absorbers are investigated. By reasonably choosing the small-signal transmissions of both saturable absorbers, the doubly passively Q-switched green laser can generate the much more symmetric pulse profile. The coupled rate equations are used to simulate the passively Q-switched process of the green laser by considering the Gaussian transversal and longitudinal distributions of the intracavity photon density. The numerical results of the equations are consistent with the experimental results. 相似文献
2.
A diode-pumped doubly Q-switched Nd:LuVO4 laser with an acousto-optic (AO) modulator and GaAs saturable absorber has been realized. The pulse profile of the doubly Q-switched Nd:LuVO4 laser has an almost absolutely symmetric shape. The dependences of pulse width, single-pulse energy and peak power on the incident pump power under different AO repetition rates are measured. By considering the transverse Gaussian distribution of the intracavity photon density and the longitudinal distribution of photon density along the cavity axis, the coupled rate equations of the laser are given. These coupled rate equations are solved numerically and the theoretical results are in agreement with the experimental results. 相似文献
3.
By simultaneously using both active and passive Q-switches in the same cavity, a diode-pumped doubly Q-switched intracavity-frequency-doubled c-cut Nd:GdVO4/KTP green laser with acoustic-optic (AO) modulator and GaAs semiconductor saturable absorber is realized. A comparison between c-cut and a-cut Nd:GdVO4 crystals shows that the doubly Q-switched c-cut Nd:GdVO4/KTP green laser can generate narrower pulse and higher peak power when the incident pump power is higher than 4.4 W. In addition, the doubly Q-switched c-cut Nd:GdVO4/KTP green laser can generate more symmetric and shorter pulse in comparison with singly AO- or GaAs-Q-switched laser. The coupled rate equations are used to simulate the process of these lasers. 相似文献
4.
Gang Zhang Dechun Li Kejian Yang Guiqiu Li Kang Cheng Yan Zhang 《Optics Communications》2011,284(7):1982-1987
By considering the influence of the acousto-optic (AO) modulator and the nonlinear loss due to harmonic conversion in the intra-cavity frequency-doubling laser, a developed rate equation model for diode-pumped dual-loss-modulated Q-switched and mode-locked (QML) Nd:LuVO4/KTP green laser with acousto-optic (AO) modulator and Cr4+:YAG saturable absorber is presented. With this developed model, the pulse width, single-pulse energy and the other dual-loss-modulated QML green laser characteristics are numerically simulated. The simulation results show that the turnoff time is of great importance for the pulse energy and pulse width of the Q-switched pulse. A diode-pumped dual-loss-modulated QML Nd:LuVO4/KTP laser is constructed to successfully demonstrate the numerical simulation application. 相似文献
5.
G. Zhang S. Zhao Y. Li G. Li D. Li K. Yang T. Li K. Cheng H. Ge Y. Zhang Z. Yu 《Laser Physics》2010,20(6):1307-1311
A diode-pumped Q-switched and mode-locked (QML) Nd:LuVO4/KTP green laser with acousto-optic modulator (AOM) and Cr4+:YAG saturable absorber is presented. By inserting an AOM into the laser cavity, the stability of the QML green laser pulse with AO and Cr4+:YAG is improved, the modulation depth is increased and the pulse width of Q-switched pulse envelope is significantly compressed in comparison with that of the singly passively QML green laser with Cr4+:YAG. The experimental results show that the peak power of the doubly QML green laser pulse is much higher than that of the singly passively QML green laser pulse. 相似文献
6.
Tianli Feng Shengzhi Zhao Kejian Yang Guiqiu Li Dechun Li Jia Zhao Bin Zhao Yonggang Wang 《Optik》2014
By using mixed crystal Nd:Lu0.15Y0.85VO4 as laser medium, KTP as frequency-doubling crystal, a diode-pumped intracavity-frequency-doubled Q-switched and mode-locked (QML) Nd:Lu0.15Y0.85VO4/KTP green laser with acousto-optic (AO) modulator and central semiconductor saturable absorption mirror (C-SESAM) is realized by using a V-type cavity. The QML laser characteristics such as the pulse width, single-pulse energy, have been measured for different modulation frequencies of the AO modulator. In comparison with the singly passively QML green laser with central SESAM, the doubly QML green laser can generate more stable and shorter pulses with higher peak power. Based on the coupled rate equations for a diode-pumped doubly QML green laser with AO and C-SESAM, in which the saturated absorption mechanism of C-SESAM is considered, the recurrence relation of the relative amplitude of the mode-locking pulses is given and the related numerical simulations are in good agreement with the experimental results. 相似文献
7.
Yan Zhang Dechun Li Kejian Yang Guiqiu Li Gang Zhang Kang Cheng 《Optics Communications》2010,283(24):5121-5125
By using both acousto-optic (AO) modulator and GaAs saturable absorber, a diode-pumped doubly Q-switched and mode-locked (QML) YVO4/Nd:YVO4 laser is presented. The average output power and the pulse width of the Q-switched envelope have been measured. The Q-switch pulse energy of the doubly QML laser are higher than that only with GaAs. The stability of the QML laser with the dual-loss-modulation is significantly improved if compared to that only with GaAs.The experimental results show that the doubly QML YVO4/Nd:YVO4 laser has nearly 80% modulation depth and deeper than that of the singly passively QML pulse. The doubly Q-switched mode-locked pulse inside the Q-switched envelope has a repetition rate of 111 MHz and its pulse width is estimated to be about 700 ps. By using a hyperbolic secant square function and considering the Gaussian distribution of the intracavity photon density, the coupled equations for diode-pumped dual-loss-modulated QML laser is given and the numerical solutions of the equations are in good agreement with the experimental results. 相似文献
8.
Symmetric and short green-pulse generation by doubly Q-switched Nd:YVO<Subscript>4</Subscript> laser
A compact diode-pumped doubly Q-switched extracavity frequency-doubled Nd:YVO4/KTP green-pulse laser was demonstrated, using both an acoustic-optic (AO) modulator and a GaAs saturable absorber in a simple
flat-flat cavity. The green laser can generate a more symmetric and shorter pulse when compared with purely AO and passively
Q-switched lasers. A peak power of 7.54 kW with the corresponding pulse width of 3.2 ns has been achieved with the incident
pump power of 7.76 W and f
p
= 15 kHz. A reasonable analysis about the experimental results has been given. 相似文献
9.
Passive Q-switching of a laser-diode-pumped intracavity-frequency-doubling Nd:NYW/KTP laser with GaAs saturable absorber 总被引:1,自引:0,他引:1
Passive Q-switching of a laser-diode-pumped intracavity-frequency-doubling Nd:NYW/KTP laser has been realized with GaAs semiconductor saturable absorber. The dependence of pulse repetition rate, pulse energy, and pulse width on incident pump power are measured. The coupled rate equations are used to simulate the Q-switched process of laser, and the numerical solutions agree with the experimental results. 相似文献
10.
11.
F. Q. Liu H. R. Xia Z. C. Ling S. Q. Sun D. G. Ran W. L. Gao J. L. He H. J. Zhang J. Y. Wang 《Laser Physics》2008,18(8):954-957
A simple and compact diode-pumped acousto-optically Q-switched intracavity frequency-doubled Nd:LuVO4/KTP green laser were demonstrated successfully for the first time. At an incident pump power of 6.5 W, an average output power of 663 mW, a pulse width of 26 ns were obtained with a PRF of 10 kHz. The pulse energy and peak power of the green light were determined to be 66.3 μJ and 2.55 kW, respectively. 相似文献
12.
Nd3+:NaY(WO4)2, known as Nd:NYW, is a new type crystal. By using laser-diode as pump source, a passive Q-switching of intracavity-frequency-doubling Nd:NYW/KTP laser has been realized with Cr4+:YAG saturable absorber. The dependence of pulse repetition rate, pulse energy, pulse width, and peak power on incident pump power for different small-signal transmissions of Cr4+:YAG are measured. The coupled rate equations are used to simulate the Q-switched process of laser, and the numerical solutions agree with the experimental results. 相似文献
13.
K. Cheng S. Z. Zhao D. C. Li K. J. Yang G. Q. Li T. Li G. Zhang B. Zhao 《Laser Physics》2011,21(1):74-78
A diode-pumped passively Q-switched Nd:Lu0.15Y0.85VO4 laser with a GaAs output coupler is demonstrated. By using a mixed crystal Nd:Lu0.15Y0.85VO4 as laser medium, the passively Q-switched laser can generate shorter pulse width with higher peak power in comparison with
the passively Q-switched Nd:LuVO4 or Nd:YVO4 lasers under the same laser cavity. At the incident pump power 11.9 W, the minimum pulse width of 3.23 ns and the maximum
peak power 1.67 kW can be obtained. The average output power and the pulse repetition rate of the laser are also measured.
The experimental results show that the mixed crystal is a promising laser medium for shorter Q-switched pulse with higher
peak power. 相似文献
14.
Kang Cheng Yufei Li Guiqiu Li Dechun Li Kejian Yang Gang Zhang Xin Li 《Optics Communications》2011,284(19):4570-4573
A diode-pumped doubly Q-switched c-cut Nd:GdVO4 laser at 1.34 μm with acousto-optic (AO) modulator and V3+:YAG saturable absorber is demonstrated. This doubly Q-switched laser can generate shorter pulse width and higher peak power than the singly Q-switched laser only with an AO modulator or a V3+:YAG saturable absorber. By considering the thermal lens effect of the laser gain medium, the coupled rate equations for the doubly Q-switched laser at 1.34 μm under Gaussian approximation are given. The numerical solutions of the equations are in agreement with the experimental results. 相似文献
15.
K. Yang S. Zhao G. Li J. Zou P. Song W. Wu 《Applied physics. B, Lasers and optics》2005,80(6):687-692
By simultaneously using both an acoustic-optic (AO) modulator and a Cr4+:YAG saturable absorber in the cavity, for the first time, a diode-pumped doubly Q-switched Nd:GdVO4 laser has been realized. The pulse duration is obviously compressed in contrast to the actively acoustic-optic Q-switched laser. By considering the Gaussian transversal distribution of the intracavity photon density and the longitudinal distribution of the photon density along the cavity axis as well as the influence of turnoff time of the acoustic-optic (AO) Q-switch, we provide the coupled rate equations for a diode-pumped doubly Q-switched Nd:GdVO4 laser with both an acoustic-optic (AO) modulator and a Cr4+:YAG saturable absorber. These coupled rate equations are solved numerically, and the dependence of pulse width, pulse energy and peak power on the incident pump power at different pulse repetition rates is obtained. The numerical solutions of equations agree well with the experimental results.This revised version was published online in August 2005 with a corrected cover date. 相似文献
16.
A diode-pumped actively Q-switched Nd:GdVO4 green laser with periodically poled KTP (PPKTP) and Acoustic-optic (AO) modulator has been realized. The dependences of pulse energy, pulse width, and peak power on incident pump power are measured. At the pump power of 4.1 W and repetition rate of 10 kHZ, we can obtain a 19.2 ns pulse with pulse energy of 0.11 mJ and peak power of 5.8 kW, which are almost three times of that in the conventional KTP green laser, respectively. A rate equation model is introduced to theoretically analyze the results obtained in the experiment, in which the Gaussian spatial distribution of the intracavity photon density is taken into account. The numerical solutions of the rate equations agree with the experimental results. 相似文献
17.
We present a simple technique to improve the symmetry of pulse emitted by doubly passively Q-switched lasers. Using both Cr4+:YAG and GaAs saturable absorbers in the same cavity, a diode-pumped doubly passively Q-switched Nd:YVO4 laser is realized for the fist time. This laser can generate more symmetric pulse with shorter pulse width and higher peak power compared with the solely passively Q-switched laser with Cr4+:YAG saturable absorber or GaAs coupler. The pulse symmetry factor ε of such a doubly passively Q-switched laser is experimentally shown to reach 1.05. Simulations by a rate-equation model for doubly passively Q-switched laser are in close agreement with the experimental results.PACS 42.55.Xi; 42.55.Rz; 42.60.Gd 相似文献
18.
By varying the positions of the saturable absorber in the laser axis and the pump beam waist in the gain medium, respectively, we have theoretically and experimentally studied the control of the pulse width in a diode-pumped passively Q-switched Nd:YVO4/KTP green laser with GaAs saturable absorber. A rate equation model is introduced, in which the intracavity photon density is assumed to be Gaussian spatial distribution, the longitudinal variation of the intracavity photon density and the pump beam spatial distribution are also considered. The experimental results are consistent with the numerical calculations of the rate equations. 相似文献
19.
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
20.
By using double-mixed crystal Nd:Lu0.15Y0.85VO4 as laser medium, a diode-pumped doubly Q-switched and mode-locked (QML) Nd:Lu0.15Y0.85VO4 laser with acousto-optic (AO) modulator and central semiconductor saturable absorption mirror (SESAM) is realized for the
first time. The Q-switched envelope modulation depth is nearly 100%.The average output power and the pulse width of the Q-switched
envelope etc. for different AO modulator repetition rates have been measured. The experimental result show that Nd:Lu0.15Y0.85VO4 crystal is an excellent laser medium for doubly QML lasers. 相似文献