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1.
Using the vertical evaporation technique we fabricated saturable absorbers by transferring the double-wall carbon nanotubes
(DWCNT) onto a hydrophilic quartz substrate. The fast recovery time and the saturation intensity of the absorber were measured
to be 228 fs and 130 μJ/cm2, respectively, at 1060 nm. The modulation depth of the absorber was about 3.7%. Passive mode-locked Nd:GdVO4 laser was demonstrated. The continuous wave mode-locked pulses pulse duration is 5.6 ps and the largest average output power
is 1.2 W at the pump power of 9.5 W. To the best of our knowledge, this is the first demonstration of high power continuous
wave mode locking laser with DWCNT absorber. 相似文献
2.
The pure semiconductor type single wall carbon nanotubes (SWCNT) was transferred on hydrophilic glass substrate to fabricate saturable absorbers by vertical evaporation technique. The recovery time of the absorber is 350 fs. The saturation intensity of the absorber was found to be 115 μJ/cm2 at 1060 nm. The modulation depth of the absorber could be about 7%. Passive mode-locked Nd:YVO4 laser using this kind of absorber was demonstrated. The largest average output power of the mode-locked laser is 1.4 W at the pump power of 7.8 W. The continuous wave mode-locked pulses with the repetition of 80 MHz were achieved. 相似文献
3.
B. Y. Zhang G. J. Wang W. J. Wang Y. L. Liu X. X. Gao M. Chen G. Li 《Laser Physics》2011,21(12):2045-2048
We report a cavity-dumped mode-locked Nd:GdVO4 laser with semiconductor saturable absorber mirrors at low repetition rate. In this laser system, a single mode-locked laser
pulse is generated, amplified and cavity-dumped by means of electro-optic modulator at 1 to 10 Hz repetition rate. The energy
of the pulse is about 150 nJ and the pulse duration is determined to be 10 ps. 相似文献
4.
We use a single walled carbon nanotubes (SWCNTs) absorber to demonstrate a high power mode locking for Nd:YVO4 lasers. Under the pump power of 12 W, continuous wave mode-locked (CWML) pulse were generated with the maximum average output
power of 3.6 W and the pulse duration of 7.6 ps. The peak power and the single pulse energy of the mode-locked laser were
up to 4.9 kW and 37.5 nJ, respectively. To our knowledge, this is the highest average output power of the CWML laser with
the SWCNTs absorber reported. 相似文献
5.
We report a passive mode-locked Nd:YVO4 laser pumped by 880 nm LD using a transmission-type multi-walled carbon nanotube saturable absorber. At the pump power of
6.1 W, the average output power of 0.8 W of continuous wave mode-locked laser with optical conversion efficiency of 13.1%
was generated. The repetition rate and pulse energy of the mode-locked pulse were 88 MHz and 9.1 nJ, respectively. 相似文献
6.
We report the mode locking of a diode pumped Nd:YVO4 crystal laser by using a transmission-type single-walled carbon nanotube saturable absorber. The laser operated at 1064 nm
pumped by a fiber coupled laser diode with the cavity length of 1826 mm, generated a pulse width of 14 ps at a repetition
rate of 82 MHz. The output power of 120 mW was obtained at the absorbed pumping power of 1400 mW. 相似文献
7.
By using both an acoustooptical (AO) modulator and a Cr4+:YAG saturable absorber in the cavity, a diode-pumped doubly Q-switched Nd:GdVO4 laser, which can generate short pulses with high peak powers and symmetric temporal profiles, has been demonstrated. A peak power of 3.05 kW with a corresponding pulse width of 16 ns has been achieved at an incident pump power of 7.7 W. A reasonable analysis about the experimental results has been given by considering the ground-state absorption and excited-state absorption of a Cr4+:YAG crystal. 相似文献
8.
We report on a diode end-pumped passively mode-locked Nd:GdVO4 laser. By using a GaAs wafer simultaneously as the saturable absorber and the output coupler, stable continuous-wave mode locking was achieved. The pulse width was measured to be 18.9 picoseconds at a repetition rate of 370 MHz. The most remarkable property of the laser is that its repetition rate can be changed from 370 MHz to 3.348 GHz by simply changing the cavity length. An average output power of 3.46 W at a 3.348 GHz repetition rate was obtained with a 14 W pump power. To our knowledge, this is the first demonstration of a passively mode-locked Nd:GdVO4 laser using a GaAs wafer as the saturable absorber. PACS 42.55.Rz; 42.60.Fc; 42.55.Xi. 相似文献
9.
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
10.
Y. Yan H. L. Zhang P. F. Sha L. Cui R. N. Li X. Lin H. J. Zhang J. L. He J. G. Xin 《Laser Physics》2010,20(6):1284-1287
An 83 W, near-diffraction-limited LD end-pumped Nd:GdVO4 slab laser with hybrid resonator was presented with the pumping power of 238 W, the slope efficiency and optical-to-optical
conversion efficiency were 39.4 and 34.9%, respectively. At the output power of 70 W, beam quality M2 factors were 1.2 in stable direction and 1.3 in unstable direction. 相似文献
11.
In this paper, we report a 22.7 W continuous wave (CW) diode-pumped cryogenic Ho( at %), Tm(3 at %):GdVO4 laser. The pumping sources of Ho,Tm:GdVO4 laser are two fiber-coupled laser diodes with fiber core diameter of 0.4 mm, both of them can supply 42 W power laser operating
near 802 nm. For input pump power of 64.7 W at 802.5 nm, the output power of 22.7 W in CW operation, optical-to-optical conversion
efficiency of 35.1% at 2.05 μm has been attained. The M
2 factor was found to be 2.0 under an output power of 16.5 W. 相似文献
12.
We improved the electro-optical cavity-dumped Nd:GdVO4 laser performance at high repetition rates by employing continuous-grown GdVO4/Nd:GdVO4 composite crystal under 879 nm diode-laser pumping. A constant 3.8 ns duration pulsed laser was obtained and the repetition
rate could reach up to 100 kHz with a maximum average output power of 13.1 W and a slope efficiency of 56.4%, corresponding
to a peak power of 34.4 kW. 相似文献
13.
J. Y. Peng B. S. Wang Y. G. Wang J. G. Miao E. J. Hao H. M. Tan L. S. Qian X. Y. Ma 《Laser Physics》2007,17(8):1033-1036
Passive mode locking of a solid-state Nd:GdVO4 laser is demonstrated. The laser is mode locked by use of a semiconductor absorber mirror (SAM). A low Nd3+ doped Nd:GdVO4 crystal is used to mitigate the thermal lens effect of the laser crystal at a high pump power. The maximum average output power is up to 6.5 W, and the pulse duration is as short as 6.2 ps. The optic-to-optic conversion efficiency is 32.5% and the repetition rate is about 110 MHz. 相似文献
14.
M. Li S. Zhao K. Yang G. Li D. Li J. Wang J. An W. Qiao 《Applied physics. B, Lasers and optics》2007,88(4):531-537
A diode-pumped self-Q-switched and mode-locked intracavity frequency doubled Nd:GdVO4/KTP green laser is presented. The self mode-locking is self-starting and stable. About 100% modulation depth for the self-mode-locked
green pulses has been achieved. We propose a developed rate equation model for self-Q-switched and mode-locked lasers, using
the hyperbolic secant function methods and the theory of Kerr-lens mode-locking. This will consider the cascading of second-order
nonlinearities of KTP crystal, the third-order nonlinearity of the laser medium, influences of the continuous pump rate, and
the stimulated radiation lifetime of the active medium. With the model developed, theoretical calculations are shown to be
in good agreement with experimental results. The width of the mode-locked green pulse is estimated to be about 120 ps.
PACS 42.60.Fc; 42.60.Gd; 42.65.Hw 相似文献
15.
Diode-pumped simultaneously Q-switched and mode-locked Nd:GdVO<Subscript>4</Subscript>/LBO red Laser
Z. -Y. Li B. -T. Zhang J. -F. Yang J. -L. He H. -T. Huang C. -H. Zuo J. -L. Xu X. -Q. Yang S. Zhao 《Laser Physics》2010,20(4):761-765
A diode-end-pumped simultaneously Q-switched and mode-locked intracavity frequency doubled Nd:GdVO4/LBO red laser with an acousto-optic Q-switch was realized. The maximum red laser output power of 250 mW was obtained at the
incident pump power of 8.3 W and the repetition rate of 10 kHz. At 5 kHz, the maximum mode-locking modulation depth of about
80% was achieved with the Q-switched pulse width of 440 ns. The red mode-locked pulse inside the Q-switched pulse had a repetition
rate of 115 MHz, its average pulse width was estimated to be about 350 ps. 相似文献
16.
In this paper, we report a 18.8 W continuous wave and 18.4 W Q-switched diode-pumped cryogenic Tm(5 at %), Ho(0.5 at %):GdVO4 laser. The pumping source of Tm, Ho:GdVO4 laser is a fiber-coupled laser diode with fiber core diameter of 0.4 mm, supplying 42 W power at 802.5 nm. For input pump
power of 41.9 W at 802.4 nm, the output power of 18.8 W in CW operation, optical-to-optical conversion efficiency of 45% at
2.05 μm and the average output power of 18.4 W in Q-switched operation, optical-to-optical conversion efficiency of 44% at
2.04 and 2.05 μm have been attained. The emission wavelengths of the Tm(5 at %), Ho(0.5 at %):GdVO4 laser were firstly compared when it worked in CW mode and Q-switched mode. 相似文献
17.
By simple extra-cavity frequency conversion, the performance of a diode single-end-pumped AO Q-switched Nd:GdVO4/KTP/BBO 266 nm laser was demonstrated. Under the incident pump power of 14.32 W, the maximum average output power at 266
nm was 374 mW at the repetition of 20 kHz; the opticaloptical conversion efficiency was 2.6%. The corresponding pulse width
was 5 ns, with the single-pulse energy and peak power calculated to be 18.7 μJ and 3.74 kW, respectively. The dependence of
the operational parameters on the pump power was also investigated experimentally. 相似文献
18.
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
19.
The differences between the performances of electro-optical (EO) and acousto-optical (AO) Q-switched, diode pumped Nd:GdVO4 laser at high repetition rates were detailed in this paper. The results revealed that EO Q-switch was more favorable to obtain
short pulse width and high peak power laser than AO Q-switch under high repetition rate operation. The minimum pulse widths
at 100 kHz were 20.2 ns under EO operation and 28.7 ns under AO operation, corresponding to peak powers of 3.1 kW and 2.2
kW, respectively. The corresponding values at 10 kHz were 5.3 ns, 9.0 ns and 77.4 kW, 45.6 kW, respectively. 相似文献
20.
We demonstrate a LD end-pumped passively mode-locked Nd:YVO4 laser using a single-walled carbon nanotubes saturable absorber (SWCNT-SA). The SWCNT wafer was fabricated by electric arc
discharge method on quartz substrate with absorption wavelength of 1064 nm. At the absorbed pump of 15.8 W, an output power
of 750 mW CW (continuous wave) mode-locked laser pulse was achieved with the repetition of 79.7 MHz, corresponding to optical-optical
efficiency of 4.75%. 相似文献