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1.
A. Antonetti F. Blasco J.P. Chambaret G. Cheriaux G. Darpentigny C. Le Blanc P. Rousseau S. Ranc G. Rey F. Salin 《Applied physics. B, Lasers and optics》1997,65(2):197-204
19 W/cm2 have been achieved.
Received: 10 March 1997/Revised version: 26 April 1997 相似文献
2.
Ito S. Ishikawa H. Miura T. Takasago K. Endo A. Torizuka K. 《Applied physics. B, Lasers and optics》2003,76(5):497-503
We present a 7-TW Ti:sapphire laser system operating at 50 Hz for laser Compton femtosecond X-ray generation. This laser system
delivers 8.4 W of average output power at a repetition rate of 50 Hz with a pulse width of 24 fs. It demonstrates successful
management using a dynamically stable resonator in the regenerative amplifier and compensation for thermal lensing by a convex
mirror in a ring-type four-pass power amplifier. We also present the results of closed-loop corrections for distorted wavefronts
of amplified and compressed laser pulses, using an adaptive optical system consisting of a Shack–Hartmann-type wavefront sensor
and a deformable mirror. This closed-loop correction results in dramatic improvements, reducing wavefront distortions below
0.05 λ rms.
Received: 31 October 2002 / Revised version: 3 March 2003 / Published online: 5 May 2003
RID="*"
ID="*"Corresponding author. Fax: +81-298/61-3349, E-mail: ito@festa.or.jp 相似文献
3.
We developed a high-power oscillator–regenerative amplifier femtosecond laser system. Based on chromium-doped forsterite.
The system is operating near 1.25 μm at a 5–10 kHz repetition rate. Chirped-pulse amplification produced 0.86 W (0.75 W) of
average power, or 465 mW (400 mW) after compression at 5 kHz (10 kHz). Nearly bandwidth-limited pulses of duration 135 fs
(shortest) and 150 fs (typical) are available with an energy of 93 μJ and 40 μJ at 5 and 10 kHz, respectively.
Received: 7 June 2002 / Published online: 15 November 2002
RID="*"
ID="*"Corresponding author. Fax: +49-30/63921289, E-mail: petrov@mbi-berlin.de 相似文献
4.
Design and characterization of a near-diffraction-limited femtosecond 100-TW 10-Hz high-intensity laser system 总被引:2,自引:0,他引:2
M. Pittman S. Ferré J.P. Rousseau L. Notebaert J.P. Chambaret G. Chériaux 《Applied physics. B, Lasers and optics》2002,74(6):529-535
We present the design and characterization of a femtosecond high-intensity laser system emitting a near-diffraction-limited
beam. This system was dimensioned in order to reach intensities in excess of 1020 W/cm2 at a high repetition rate for ultrahigh-field physics experiments. We describe the improvements that were added to a conventional
chirp pulse amplification configuration in order to decrease the deleterious effects of gain narrowing, gain shifting, thermal
focusing in the amplifier stages, and spatial degradation due to multipass amplification processes.
Received: 4 January 2002 / Published online: 14 May 2002 相似文献
5.
E. Goulielmakis G. Nersisyan N.A. Papadogiannis D. Charalambidis G.D. Tsakiris K. Witte 《Applied physics. B, Lasers and optics》2002,74(3):197-206
A novel application of a free-standing transmission grating as a beam splitter in a Michelson-type interferometer is described.
The arrangement can operate in the XUV and soft X-ray spectral region and, therefore, it is well suited for the characterization
of attosecond pulses. Using ray-tracing codes, we have analyzed three different setups in which spherical mirrors are employed
in conjunction with the transmission grating and have investigated in detail their dispersive characteristics. It is shown
that such an arrangement can be made to exhibit group-delay dispersion of ∼1 as2 while it provides two co-propagating and converging beams.
Received: 12 October 2001 / Revised version: 17 December 2001 / Published online: 7 February 2002 相似文献
6.
Generation of high-quality 10-femtosecond laser pulses with intracavity spatial and spectral control
Spatial and spectral control, using an intracavity capillary and a slit, is applied to improve the output pulse quality of
a Ti:sapphire laser. Satellite-free 10-fs optical pulses with a smooth spectral and spatial profile have been generated. Employing
a root-mean-square formalism for pulse characterization, spatial, spectral and temporal intensity distributions are analyzed
for laser pulses with a duration as short as three to four optical cycles.
Received: 11 June 2001 / Published online: 18 July 2001 相似文献
7.
Diode-pumped Cr:LiCAF fs regenerative amplifier system seeded by an Er-doped mode-locked fiber laser
A fs regenerative amplifier based on Cr:LiCAF is demonstrated for the first time. With direct diode pumping, 8 μJ of pulse
energy are obtained directly from the amplifier. When seeded by an Er-doped fiber laser, the amplified seed pulses are compressed
down to 252 fs, limited by residual net third-order dispersion of the compression gratings and intracavity elements. Pulse
broadening due to second- and third-order dispersion is theoretically investigated and compared to experimental results. Dispersion
generated by the geometrical cavity arrangement is measured experimentally.
Received: 19 November 2001 /
Revised version: 28 January 2002 / Published online: 14 March 2002 相似文献
8.
Received: 13 May 1997/Revised version: 1 August 1997 相似文献
9.
M.E. Klein M. Scheidt K.-J. Boller R. Wallenstein 《Applied physics. B, Lasers and optics》1998,66(6):727-732
4 (KTP) optical parametric oscillators (OPOs) with pump and idler resonant cavities. With a linear two-mirror cavity the pump
power at threshold was 70 mW. The single-frequency signal and idler output wavelengths were tuned in the range of 1025 to
1040 nm and 1250 to 1380 nm by tuning the dye laser in the range of 565 to 588 nm. With a dual three-mirror cavity the threshold
was 135 mW. Pumped by 500 mW of 578 nm radiation the 1040 nm single-frequency signal wave output power was 84 mW. Power and
frequency stable operation with a spectral bandwidth of less than 9 MHz was obtained by piezo-electrically locking the length
of the pump resonant cavity to the dye laser wavelength. Similar performance was achieved by placing the idler resonant OPO
inside the resonator of the dye laser. With this system power stable and single-frequency operation was achieved with a spectral
bandwidth of less than 11 MHz for the idler wave.
Received: 3 February 1998/Revised version: 9 March 1998 相似文献
10.
Received: 17 December 1998 相似文献
11.
W.J. Wadsworth I.T. McKinnie A.D. Woolhouse T.G. Haskell 《Applied physics. B, Lasers and optics》1999,69(2):163-165
We present the first operation of a distributed feedback solid state dye laser with a dynamic, pump-induced grating. Broadly
tunable, narrow band operation in the region of 616 nm (604–649 nm) has been demonstrated with perylene red laser dye doped
in poly(methyl methacrylate) (PMMA), when pumped with a frequency doubled Nd:YAG laser. Conversion efficiencies of 20%, corresponding
to 35% optical-to-optical efficiency, have been measured. The laser bandwidth was between 0.01 and 0.04 nm, and smooth tuning
over more than 200 GHz has been demonstrated.
Received: 29 March 1999 / Published online: 24 June 1999 相似文献
12.
T.V. Andersen J. Thogersen S.R. Keiding J.J. Larsen 《Applied physics. B, Lasers and optics》2003,76(6):639-644
We demonstrate intracavity frequency doubling of a standard femtosecond Ti:sapphire oscillator. The cavity is extended with
a pair of focusing mirrors and a 0.5-mm-thick BBO crystal. We achieve a repetition rate of 50 MHz and simultaneously generate
22 mW of 55-fs pulses at 810 nm and 200 mW of 73-fs pulses at 405 nm, which corresponds to 4 nJ per pulse. We create a total
of 330-mW, 405-nm light when pumping the Ti:sapphire crystal with 5.7 W from an Ar-ion laser, corresponding to a conversion
efficiency of 5.7%. No saturation is found, which implies that higher outputs can be achieved with higher pump rates. Preliminary
results from the use of blue pulses as pump in an optical parametric amplifier seeded by pulses from a photonic crystal fiber
are presented.
Received: 27 January 2003 / Revised version: 27 March 2003 / Published online: 12 May 2003
RID="*"
ID="*"Corresponding author. Fax: +45-861/96199, E-mail: tva@chem.au.dk 相似文献
13.
Since the inception of the laser, pulse duration has been continuously decreased by the use of a variety of techniques: Q-switching,
mode-locking, and pulse compression. We would like to present a new technique based on the addition of laser sub-harmonic,
ALS, that allows the production of a single-cycle pulse with single-femtosecond pulse duration. This simple technique takes
advantage of the recent progress made in the generation of a few optical cycles and in optical parametric amplification.
Received: 10 March 1999 / Revised version: 17 May 1999 / Published online: 30 July 1999 相似文献
14.
A.A. Babin D.V. Kartashov A.M. Kiselev V.V. Lozhkarev A.N. Stepanov A.M. Sergeev 《Applied physics. B, Lasers and optics》2002,75(4-5):509-514
. We report on the experimental and theoretical study of spectrum transformation and frequency blue-shift of femtosecond laser
pulses with intensities up to 2×1016 W/cm2, propagating in glass capillary tubes under gas ionization. Monomode optical guiding with 45% transmission efficiency is
demonstrated in a 100-μm-diameter, 20-cm length capillary. A broadening of the initial spectrum as much as several initial
spectrum widths is achieved. Besides the broadening, the mean frequency of the output radiation in the spectrum experiences
a blue-shift of up to several initial spectrum widths, caused by the non-stationary, non-linear process of gas ionization.
Our numerical simulations, in the form of a simple one-dimensional model for the propagation of intense laser pulses in gas-filled
capillaries, are in good qualitative agreement with the experimental results. These simulations show the possibility of significant
compression of an output pulse in a simple compression scheme (e.g. a piece of silica glass with normal dispersion), which
is very important for obtaining laser pulses with few optical cycles at the millijoule energy level.
Received: 25 September 2001 / Revised version: 6 December 2001 / Published online: 25 September 2002
RID="*"
ID="*"Corresponding author. Fax: +7-8312/363-792, E-mail: dekart@ufp.appl.sci-nnov.ru 相似文献
15.
F.H. Loesel C. Horvath F. Grasbon M. Jost M.H. Niemz 《Applied physics. B, Lasers and optics》1997,65(6):783-787
Received: 16 July 1997/Revised version: 24 September 1997 相似文献
16.
M. Jackson E.M. Telles M.D. Allen K.M. Evenson 《Applied physics. B, Lasers and optics》2001,72(7):815-818
A significantly improved far-infrared laser has been used to generate optically pumped laser emissions from 26 to 150 μm for
CD3OH. Using an X–V-pumping geometry, several new laser emissions have been found for CD3OH. In addition, an increase in power, by factors from 10 to 1000, for many of the previously known shorter-wavelength laser
lines, below 100 μm, has been observed. Frequency measurements for several lines have also been performed and have been reported
to a fractional uncertainty up to ±2×10-7, permitting the spectroscopic assignment of the laser transition. One of the frequency-measured lines, 44.256 μm observed
using the 10R34 pump, has confirmed the assignment of the previously reported FIR emission (n,K;J)=(1,7;20)?(0,8;20)A in the
ground vibrational state.
Received: 26 October 2000 / Published online: 7 February 2001 相似文献
17.
We demonstrate an optical limiter for ultra-short (∼100-fs) laser pulses. The device has a dynamic range (= damage energy/onset-of-limiting
energy) of more than 10000 and an onset-of-limiting energy of only ∼10 nJ. The output-pulse energy is kept below 1.3 μJ. The
limiting mechanism is based on two-photon absorption and refractive nonlinearities in a 20-mm piece of ZnSe. We discuss the
importance of the different nonlinearities, damage issues, and guidelines for the construction of the device.
Received: 20 December 2001 / Revised version: 25 March 2002 / Published online: 8 May 2002 相似文献
18.
2 (2 mm thick) and GaSe (1 mm thick) crystals are applied as nonlinear media. GaSe has a larger tuning range and is more efficient
in the whole spectral range than AgGaS2. The average IR power reaches up to 2.0 mW at 8.5 μm when the GaSe crystal is used, and up to 1.3 mW at the same wavelength
when AgGaS2 is applied for the frequency conversion.
Received: 17 February 1997/Revised version: 14 July 1997 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.
U. Heitmann M. Kötteritzsch S. Heitz A. Hese 《Applied physics. B, Lasers and optics》1992,55(5):419-423
Design and performance characteristics of a tunable dye laser system for sum frequency mixing (SFM) in a BBO crystal are presented. The system is composed of two tunable pulsed dye lasers pumped synchronously by the second harmonic of a commercial Nd:YAG laser. The radiation produced by the first dye laser is frequency doubled by second-harmonic generation (SHG) in KDP and subsequently mixed by SFM in BBO with the light of the second dye laser. The interest was focussed on generation of tunable laser radiation below 205 nm with high output power and long-time wavelength stability. High conversion efficiencies enable output energies of 100 J (20 kW) at 196 nm using only moderate Nd:YAG pump energies of 67 mJ. Altogether, a laser system with very good specifications for analytical application in the near VUV spectral region is reported. 相似文献