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1.
A Bidirectional, Diode-Pumped, Passively Mode-Locked Nd:YVO4 Ring Laser with a Low-Temperature-Grown Semiconductor Saturable Absorber Mirror
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We report the operation of a bidirectional picosecond pulsed ring Nd:YVO4 laser based on a low-temperaturegrown semiconductor saturable absorber mirror. Except for the laser crystal, the six-mirror ring laser cavity has no intra-cavity elements such as focusing lens or mirror. The bidirectional mode locked pluses are obtained at the repetition rate of 117.5 MHz, pulse duration of 81 ps, power of 2 × 200 mW. 相似文献
2.
The pulse width of a synchronously pumped laser chiefly depends on the available cavity bandwidth and the pump-pulse duration. A functional form of this dependence was suggested in the literature. We present an alternate relation which is supported by analytical and numerical results, as well as by experimental results, obtained by us and by others. 相似文献
3.
T. Miura H. Nagaoka K. Takasago K. Kobayashi A. Endo K. Torizuka M. Washio F. Kannari 《Applied physics. B, Lasers and optics》2002,75(1):19-23
Two mode-locked Ti:sapphire lasers of different wavelengths were precisely synchronized by a simple feedback system employing
sum-frequency generation (cross correlation). When the timing error exceeded the pulse duration, the periodic bunch of the
sum-frequency pulse was used for rough timing adjustment. Using cross correlation with a stretched pulse, we struck a balance
between wide locking range and sensitive timing detection. When the two lasers were well-synchronized, we obtained a continuous
cross-correlation pulse train for 3 min. The holding time of the laser synchronization was extended to over one hour by adding
a motorized stage to the PZT-mounted cavity mirror. We estimated the rms timing jitter between the two lasers by a scanning
cross-correlation measurement. We confirmed that the rms timing jitter of the two lasers during 1.8 s was 28 fs.
Received: 30 January 2002 / Revised version: 14 June 2002 / Published online: 8 August 2002 相似文献
4.
P. Mataloni M. Santosuosso F. De Martini S. Bollanti 《Applied physics. B, Lasers and optics》1991,52(2):117-121
A colliding pulse mode-locked ring dye laser, pumped by an all-line small frame Ar+ laser has been used to generate stable pulses as short as 49 fs with pulse duration and stability similar to those obtained with the usual configuration where a single line of the pump is used. The effects of cavity alignment on the absorber saturation are presented and explained in terms of an analysis of stability of the ring cavity. 相似文献
5.
The circulation of an ultrashort light pulse in a continuously pumped modelocked dye laser with a linear cavity configuration containing the active dye, the saturable absorber and a bandwidth-limiting elements is treated. The steady-state condition that the pulse shape reproduces after each cavity round-trip leads to a nonlinear integro-differential equation for this pulse shape. An approximate method for the solution of this equation not limited to the case of low laser gain and small pulse energies is given. The stable single pulse region and characteristic pulse parameters, as energy, duration, intensity and asymmetry, are considered in dependence on the laser parameters. 相似文献
6.
A High-Energy Good-Beam-Quality Krypton-Lamp-Pumped Nd:YAG Solid-State Laser with One Pump Cavity
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We investigate a high-energy good-beam-quality krypton-lamp-pumped pulsed Nd: YA G solid-state laser with one pump cavity. The symmetrical resonator laser is developed and is rated at 80 J with beam parameter product 12mm mrad. The total system electro-optics efficiency of the lamp-pumped YAG laser is as high as 3.3% and the stability of output energy is ±2% with pulse width tunable between 0.1 ms and 10ms. The experimental results are consistent with the theoretical analysis and simulation. 相似文献
7.
The circulation of a synchronously mode locked dye laser pulse in a linear cavity configuration containing a dye cell as an active medium and a bandwidth-limiting element is treated. The condition that the pulse shape reproduces after each cavity round-trip provides a nonlinear integro-differential equation for the steady-state pulse shape. For the solution of this equation an approximate method, not limited to small pulse energies, is given and the pulse duration, intensity, energy, asymmetry of the pulse shape, stable regions and other interesting parameters are discussed. 相似文献
8.
We present a laser source with several desirable characteristics, such as tunable wavelength in the near infrared, single-longitudinal-mode
emission and variable pulse temporal duration in the nanosecond regime. The laser is based on an injection-seeded Titanium-doped-sapphire
ring cavity. Our experiments show how the pulse duration can be varied in a controllable fashion either by changing the cavity
length or by changing the pump energy. We present a theoretical model which successfully reproduces the experimental results
by treating the operation of this type of laser as a gain-switching technique. As far as the stabilization of the laser cavity,
we also present a novel solution involving the use of an avalanche photodiode. 相似文献
9.
The modelocking of a Nd:YAG laser using second-harmonic generation in an external cavity as the only pulse shortening process is reported. The output of a long pulse Nd:YAG laser was simultaneously modelocked and Q-switched. The average pulse duration was 30–50 ps and the peak power was in the range 60–160 kW. 相似文献
10.
D. Nodop J. Rothhardt S. H?drich J. Limpert A. Tünnermann 《Applied physics. B, Lasers and optics》2009,94(3):399-401
We present a Q-switched microchip laser emitting 1064-nm pulses as short as 100 ps synchronized to a cavity dumped femtosecond
laser emitting 800-nm pulses as short as 80 fs. The synchronization is achieved by presaturating the saturable absorber of
the microchip laser with femtosecond pulses even though both lasers emit at widely separated wavelengths. The mean timing
jitter is 40 ps and thus considerably shorter than the pulse duration of the microchip laser. 相似文献
11.
N.D. Lai M. Brunel F. Bretenaker O. Emile 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2002,19(3):403-410
We study theoretically and experimentally different methods to control the pulses emitted by solid-state lasers passively
Q-switched by a saturable absorber. We explore one- and two-axis laser schemes allowing to control the pulse duration, which
is ruled by the saturation powers of the transitions in the absorber and in the gain medium. In one-axis lasers, it is shown
that the adjustment of the pump and laser beam sizes in the active medium and in the absorber provides an efficient means
to control the pulse temporal shape and duration. Furthermore, a two-axis laser cavity supporting so-called forked-eigenstate
operation permits to freely adjust the parts of the mode power which circulate in the gain medium and in the absorber. In
this case, a lengthening of the pulse duration up to 500 ns is obtained with an increase of the average output power. The
theoretical results obtained by using rate equations adapted to each cavity geometry are in close agreement with experiments
performed on a diode-pumped Nd3+:YAG laser Q-switched by a Cr4+:YAG saturable absorber. The relevance of the different techniques to control the pulse durations in the framework of potential
applications is discussed.
Received 3 December 2001 相似文献
12.
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
13.
We demonstrate a harmonic mode-locked ytterbium-doped fibre ring laser, which consists of a polarization-sensitive isolator, two polarization controllers, two 976nm laser diodes as the pump source and a two-segment ytterbium-doped fibre. Utilizing an additive pulse mode-locked technique based on nonlinear polarization evolution, the ytterbium-doped fibre laser can operate in mode-locked state by adjusting the position of polarization controllers. The cavity fundamental repetition rate is 23.78 MHz. We also observe the second- and third-harmonic mode locking in the normal dispersion region, and their repetition rates are 47.66 MHz and 71.56 MHz, respectively. Over-driving of the saturable absorber in the harmonic mode-locking pulse is analysed and discussed in detail. 相似文献
14.
Calculation of the Spatio-Temporal Dynamics of Q-switched Yb^3+:YAG Laser with an Unstable Cavity and a Super-Gaussian Mirror
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A numerical simulation used to compute the spatio-temporal dynamics of pulse formation of diode-pumped Q- switched Yb: YA G laser is carried out. The model takes the laser amplification and gain saturation, the properties of the laser cavity, and the diffractive effects of the laser disc into account. The numerical calculation is performed for a confocal positive-branch unstable resonator with a super Gaussian coupling mirror. The simulation results show that the laser pulse starts from a Gaussian intensity distribution and becomes rapidly non-Gaussian. The corresponding beam quality M^2 factor is seen to vary approximately from 1.5 at the beginning of the formation of pulse to more than 10 in the tail of the pulse, with a value of 11.6 at the peak of the pulse. 相似文献
15.
High energy picosecond pulse trains from a passively mode-locked Nd: YAG laser are obtained. The negative feedback controlled oscillator delivers 10–30 s trains with energies of up to 30 mJ and single pulse duration of less than 25 ps. The laser is operated with a repetition rate of 10 Hz. An active Q-control of the cavity generates a short pulse train with duration of 30–40 ns. The long pulse train energy reproducibility is better than ± 1.5%. 相似文献
16.
We report an investigation of a high-pressure molecular fluorine laser operating at 158 nm. Several cavity configurations were studied, including one employing a roof prism as the high reflector. A maximum VUV pulse energy of 237 mJ, corresponding to a specific output of 3.3 J/1 was obtained when the laser was operated as a double-ended device. With single-ended operation the largest output energy was 176 mJ at a specific output of 2.5 J/1. 相似文献
17.
We propose a mode-locked figure-eight fiber laser by utilizing an attenuation-imbalanced nonlinear optical loop mirror (AI-NOLM) for the first time. Stable self-starting passively mode-locked pulses as short as 296 fs are obtained. We have also confirmed that the pulse width of the laser can be varied by changing the amount of attenuation in the AI-NOLM. 相似文献
18.
A single picosecond ultraviolet pulse has been generated based on mode-locking of a dye laser pumped by a long pulse XeCl laser to serve as the input source for a high-power ps KrF laser system. A short-pulse uv dye laser (BBQ) pumped by an additional XeCl laser was used to selectively amplify a single pulse from a mode-locked pulse train with the pulse separation of 3.2 ns. The amplified single pulse was frequency-doubled to 248 nm with the pulse duration of 20 ps. 相似文献
19.
D. Slavov 《Applied physics. B, Lasers and optics》2001,73(7):677-685
In this work a cavity design for double-pulse generation in Q-switched mode from a single laser is proposed, based on the
construction of a second laser channel using a FTIR (frustrated total internal reflection) Q-modulator. A time interval between
the two pulses from 500 ns to 120 μs is obtained in a Nd:YAG laser. A comparison with other methods and cavity designs for
double-pulse generation is presented. The case when this technique is applied on a tunable laser with metastable upper laser
level (Cr:LiCAF, Cr:LiSAF, Alexandrite, Co:MgF2 or other) is also considered. Even though the method presented in the paper does not rely only on the cavity configuration
proposed, some advantages can be obtained – both polarization and wavelength-independent tuning without polarization and wavelength
restrictions in combination with the possibility of different wavelengths and polarizations in each pulse. Moreover, by using
an active medium generating wavelengths around and up to 3 μm, the Pockels-cell-Q-switch optical transmission problems can
be avoided.
Received: 9 May 2001 / Revised version: 2 August 2001 / Published online: 15 October 2001 相似文献
20.
Multiple-Pulse Operation in Passively Mode-Locked Fibre Laser with Positive Dispersion Cavity
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We report the observation of rectangular shape spectrum in passively mode-locked fibre laser with positive dispersion cavity. The spectrum is broad and flat, and 3dB bandwidth can be up to 17.61 nm. Multiple-pulse operation is observed in our laser system. The spectrum width, pulse energy, pulse width and peak power of the mode-locked laser output change with the appearance of multiple-pulse operation. 相似文献