共查询到20条相似文献,搜索用时 31 毫秒
1.
Antonio Agnesi Federico Pirzio Elena Ugolotti Sun Young Choi Dong-II Yeom Fabian Rotermund 《Optics Communications》2012,285(5):742-745
A low threshold Cr:LiSAF laser pumped with an inexpensive single-mode laser diode emitting 120 mW was passively mode-locked with a novel ultrafast saturable absorber mirror based on single-walled carbon nanotubes (SWCNT-SAM). Pulses as short as 122 fs were achieved, tunable across 14 nm. A second pump diode coupled in polarization allowed to shorten the pulse duration to 106 fs, with up to 24-mW output power. 相似文献
2.
Antonio Agnesi Alessandro Greborio Federico Pirzio Giancarlo Reali 《Optics Communications》2011,284(16-17):4049-4051
Single-mode diodes enable a particularly simple, compact and effective pumping of solid-state laser devices for many specialized applications. We investigated a single-mode, 300-mW laser diode for pumping at 935 nm a Yb:YAG laser passively mode-locked by a semiconductor saturable absorber. Relatively short pulse generation (156 fs), tunable across 1033–1059 nm has been demonstrated. An optical-to-optical efficiency of about 28% has been obtained with 320 fs long pulses. Therefore, contrarily to what previously believed, compact diode-pumped ultrafast Yb:YAG oscillators can reliably and efficiently deliver pulses in the range of ≈ 100–200 fs with few tens of mW, which are very appealing for bio-diagnostics and amplifier seeding applications. 相似文献
3.
Kejian Yang Shengzhi Zhao Gang Zhang Kang Cheng Bin Zhao Jinlong Xu Jingliang He Yonggang Wang 《Optics Communications》2012,285(2):158-161
Diode-pumped passively mode-locked Nd:Lu0.15Y0.85VO4 laser with a single-walled carbon nanotube saturable absorber was demonstrated for the first time, to our best knowledge. The laser generated 19-ps pulses with maximum output power of 902 mW for the incident pump power of 6.5 W at the central wavelength of 1064 nm, giving an optical conversion efficiency of 14%. The continuous wave mode-locking conditions of single-walled carbon nanotube saturable absorber were analyzed and discussed. 相似文献
4.
Gang Zhang Shengzhi Zhao Guiqiu Li Dechun Li Kejian Yang Kang Cheng Chao Han Bin Zhao 《Optics Communications》2012,285(15):3289-3294
The Q-switched and mode-locked (QML) performance in a diode-pumped Nd:Lu0.2Y0.8VO4 laser with electro-optic (EO) modulator and GaAs saturaber absorber is investigated. In comparison with the solely passively QML laser with GaAs, the dual-loss-modulated QML laser with EO and GaAs can generate pulses with higher stability and shorter pulse width of Q-switched envelope, as well as higher pulse energy. At the repetition rate 1 kHz of EO, the pulse width of Q-switched pulse envelope has a compression of 89% and the pulse energy has an improvement of 24 times. The QML laser characteristics such as the pulse width, pulse peak power etc. have been measured for different small-signal transmittance (T0) of GaAs, different reflectivity (R) of output coupler and modulation frequencies of the EO modulator (fe). The highest peak power and the shortest pulse width of mode-locked pulses are obtained at fe = 1 kHz, R = 90% and T0 = 92.6%. By considering the influences of EO modulator, a developed rate equation model for the dual-loss-modulated QML laser with EO modulator and GaAs is proposed. The numerical solutions of the equations are in good agreement with the experimental results. 相似文献
5.
We demonstrate 330 MHz repetition rate operation in a ring cavity Yb:fiber laser with an innovative wavelength-division-multiplexing collimator to raise the repetition rate. The spectral bandwidth of the pulse is 30 nm and the dechirped pulse width is 48 fs. The output power is 70 mW with 600 mW, 975 nm pump laser diode. 相似文献
6.
W. W. Wang J. Liu F. Chen C. C. Liu L. H. Zheng L. B. Su J. Xu Y. G. Wang 《Laser Physics》2010,20(4):740-744
Diode-end-pumped passively mode-locked Yb3+:Lu2SiO5 (Yb:LSO) lasers both in the picosecond and the femtosecond regimes were demonstrated in this paper. The mode-locked lasers
were initiated by using of semiconductor saturable absorber mirrors (SESAM). In the absence of intra-prisms for pulse compression,
the laser emitted 1.6 W of output power with pulses width of about 4.3 ps. A pair of SF10 prisms was inserted into the laser
cavity, pulses as short as 699 fs was generated around a center wavelength of 1043.6 nm with an average output power of 800
mW and a peak power of 11.0 kW. 相似文献
7.
S. Veronesi Y.Z. Zhang M. Tonelli A. Agnesi A. Greborio F. Pirzio G. Reali 《Optics Communications》2012,285(3):315-321
A LuAG shaped rod crystal, doped with Yb3+, has been grown by μ-PD technique. The crystal diameter was about 3 mm and the length around 130 mm. A complete spectroscopic investigation in the temperature range 10–300 K is reported and data has been utilized to model the laser behavior. In the laser experiment the Yb:LuAG sample was placed in an X cavity and pumped longitudinally obtaining an efficient CW laser emission. The Yb:LuAG laser yielded a maximum output power of 23 mW with a slope efficiency of 32% and a threshold around 35 mW, at lasing wavelength of 1030 nm. No significant depolarization effects were observed, indicating a crystal growth with negligible stress. The output beam profile was investigated, yielding M2 ≈ 1.0 in both directions, further confirming the good optical quality of the sample. 相似文献
8.
We demonstrate the first Cr4+:YAG passively Q-switched c-cut Nd:YVO4 self-Raman laser at 1168.6 nm based on the Stokes shift of 816 cm−1. At the pump power of 4.7 W, the maximum output power of the Stokes line at 1168.6 nm is 270.5 mW, corresponding to an optical conversion efficiency of 5.8%. The pulse width, pulse repetition rate, pulse energy and peak power are 8.8 ns, 35.8 kHz, 7.6 μJ and 0.86 kW, respectively. At the pump of 5.0 W, the Stokes line at 1097.2 nm based on Raman shift of 259 cm−1 also appears. 相似文献
9.
Haitao Huang Jingliang He Baitao Zhang Jinlong Xu Jianfei Yang Haixia Wang Shuang Zhao 《Optics & Laser Technology》2010,42(8):1193-1197
A mini eye-safe KTiAsO4 intracavity optical parametric oscillator (IOPO) employing the shared cavity configuration and driven by a diode-end-pumped composite Nd:YAG/Cr4+:YAG laser is demonstrated in this paper. Under an incident laser diode power of 11 W, a maximum average output power of 424 mW at 1534 nm was obtained. The corresponding signal pulse width and repetition rate were 1.2 ns and 16.7 kHz, respectively. The fluctuation of the average signal output power over long-term operation was found to be ±3.0%. A theoretical model for the compact IOPO was also presented in this paper. 相似文献
10.
Renpeng Yan Xin Yu Yufei Ma Xudong Li Deying Chen Junhua Yu 《Optics Communications》2012,285(21-22):4462-4465
High-peak-power, short-pulse-width diode pumped 946 nm Nd:YAG laser in passively Q-switching operation with Cr4+:YAG is reported. The highest average output power reaches 3.4 W using the Cr4+:YAG with initial transmissivity T0=95%. When the T0=90% Cr4+:YAG is employed, the maximum peak power of 31.4 kW with a pulse width of 8.3 ns at 946 nm is generated. 相似文献
11.
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
12.
Jaroslaw Sotor Grzegorz Sobon Karol Krzempek Krzysztof M. Abramski 《Optics Communications》2012,285(13-14):3174-3178
Graphene-based passively mode-locked erbium doped fiber laser is presented. Multilayer graphene was obtained by mechanical exfoliation of pure graphitic block and deposited on the fiber ferrule. The mode-locking performance was investigated under various laser pumping conditions. The laser could operate at fundamental repetition rate of 16.34 MHz with 844 fs pulse duration and 30 mW average output power. Also harmonic-mode locking of the laser is demonstrated. 294 and 800 MHz repetition rates were obtained (corresponding to the 18th and 49th harmonic of the fundamental repetition frequency, respectively) with nearly transform-limited pulses. 相似文献
13.
Weiqing Gao Meisong Liao Hiroyasu Kawashima Takenobu Suzuki Yasutake Ohishi 《Optics Communications》2012,285(18):3809-3815
We demonstrate different operation states which can be switched by the polarization control in an erbium-doped fiber laser cavity with normal dispersion, including passive single-pulse and multiple-pulse mode-locking, coherent pulse pattern, and passive Q-switching. The mode-locked single pulse has a smooth and broad rectangular-shaped spectrum. With increasing pump power, multiple pulses appear and finally six pulses are observed, where the pulses have no interaction with each other. Keeping the pump power at 407 mW and adjusting the polarization state, we observe the coherent pulse pattern with the pulse numbers from 2 to 5. It is the first time five coherent pulses in the 1.55 μm normal dispersion cavity have been observed, to our knowledge. The mode-locked spectra are highly modulated and the largest pulse separation of 31.9 ps is observed for the two-pulse case. When the pump power exceeds 180 mW, the mode-locked operation can be switched to the passively Q-switched operation by controlling the polarization state. The repetition rate and pulse width can be changed by pump power variation, and the spectrum is tunable in the range of 8.45 nm. 相似文献
14.
Gang Zhang Shengzhi Zhao Kejian Yang Guiqiu Li Dechun Li Kang Cheng Chao Han Bin Zhao Yonggang Wang 《Optics & Laser Technology》2012,44(4):794-799
By using both the single-walled carbon nanotube saturable absorber (SWCNT-SA) and the electro-optic (EO) modulator, the stably doubly Q-switched and mode-locked (QML) operation of Nd:Gd0.3Lu0.33Y0.37VO4 laser has been demonstrated. The QML laser characteristics such as the pulse width, single-pulse energy, etc., have been measured for different modulation frequencies of the EO modulator (fe) and reflectivity (R) of output coupler. In comparison with the solely passively QML laser with SWCNT-SA, the experimental results show that the doubly QML laser can generate more stable and shorter pulses with higher pulse energy. At 9.24 W pump power, fe=1 kHz and R=93.5%, the doubly QML laser has compressed the Q-switched envelope pulse width 88% and improved the mode-locked pulsed energy 55 times. 相似文献
15.
H. Ahmad N.A. Awang M.C. Paul M. Pal A.A. Latif S.W. Harun 《Optics & Laser Technology》2012,44(3):534-537
All passively mode locked erbium-doped fiber laser with a zirconium host is demonstrated. The fiber laser utilizes the Non-Linear Polarization Rotation (NPR) technique with an inexpensive fiber-based Polarization Beam Splitter (PBS) as the mode-locking element. A 2 m crystalline Zirconia–Yttria–Alumino-silicate fiber doped with erbium ions (Zr–Y–Al-EDF) acts as the gain medium and generates an Amplified Spontaneous Emission (ASE) spectrum from 1500 nm to 1650 nm. The generated mode-locked pulses have a spectrum ranging from 1548 nm to more than 1605 nm, as well as a 3-dB bandwidth of 12 nm. The mode-locked pulse train has an average output power level of 17 mW with a calculated peak power of 1.24 kW and energy per pulse of approximately 730 pJ. The spectrum also exhibits a Signal-to-Noise Ratio (SNR) of 50 dB as well as a repetition rate of 23.2 MHz. The system is very stable and shows little power fluctuation, in addition to being repeatable. 相似文献
16.
In this letter, a diode-pumped continuous-wave and passively Q-switched 1.06 μm laser with a novel composite YVO4/Nd:GdVO4 crystal was demonstrated for the first time. Theoretical calculations showed that the temperature distribution in YVO4/Nd:GdVO4 crystal was lower than that in GdVO4/Nd:GdVO4 and Nd:GdVO4 crystals under the same conditions. After optimizing the mode matching degree, a CW output power of 5.6 W of YVO4/Nd:GdVO4 laser was obtained at the incident pump power of 12 W when the output coupler with transmission of 30% was employed. Using Cr4 +:YAG crystals with initial transmission (T0) of 80% and 90% as saturable absorbers, the pulsed YVO4/Nd:GdVO4 laser characteristics were investigated. At the incident pump power of 12 W, the maximum average output power of 2.76 W and the maximum repetition rate of 189 kHz was achieved when T0 = 90% Cr4 +:YAG was used. The shortest pulse width was 28.1 ns when the initial transmission of the used Cr4 +:YAG was 80%. 相似文献
17.
A passively Q-switched a-cut Nd:GdVO4 self-Raman solid-state laser with Cr:YAG saturable absorber was firstly demonstrated. The first Stokes at 1173 nm was successfully obtained. At the maximum incident pump power, the pulse width was about 1.8 ns and the repetition rate was 27.5 kHz. 586.5 nm yellow laser output was also realized by use of an LBO frequency doubling crystal. 相似文献
18.
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
19.
A compact intra-cavity pumped low threshold continuous-wave Ho:Sc2SiO5 laser is reported. The characteristics of output wavelength tuning are investigated by use a intra-cavity briefringent (BF) filter. A wavelength tunable range of 140 nm from 2020 to 2160 nm is achieved. For the free-running mode, the laser slope efficiency is 24.8%, when the output central wavelength is 2110 nm. The laser threshold is about 820 mW of incident pump power. With the BF filter, a maximum output power of 870 mW is obtained at the incident pump power of 5 W, corresponding to a slope efficiency of 20.3%. The characteristics of output wavelength verse the crystal temperature are also investigated. 相似文献
20.
Jia Xu Sida Wu Jiang Liu Qian Wang Quan-Hong Yang Pu Wang 《Optics Communications》2012,285(21-22):4466-4469
We demonstrate graphene mode-locked nanosecond erbium-doped fiber laser in an all-fiber ring cavity. The clean and robust pulse train was generated at 27 mW pump power. Resultant central wavelength, repetition rate and pulse width was 1560 nm, 388 kHz and 6 ns, respectively. With two stage fiber amplifier, the output power was 553 mW, corresponding to single pulse energy of 1.4 μJ. In addition, the pulse-width can be varied ranging from 3 ns to 20 ns at repetition rate between 200 kHz and 1.54 MHz by changing the length of the laser cavity. 相似文献