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1.
4 (RTA), which provides a threshold pump power of 16 mW. The maximum signal wave power is 23 mW at a wavelength of 1243 nm.
The spectral bandwidth of the signal wave is less than 750 kHz.
Received: 3 February 1998 相似文献
2.
Intracavity optical parametric oscillator at 1572-nm wavelength pumped by passively Q-switched diode-pumped Nd:YAG laser 总被引:4,自引:0,他引:4
W. Zendzian J.K. Jabczyński J. Kwiatkowski 《Applied physics. B, Lasers and optics》2003,76(4):355-358
An intracavity optical parametric oscillator (IOPO) based on bulk KTP crystal was constructed with a Nd:YAG slab as an active
medium pumped by a 300-W diode array and Cr:YAG as a passive Q-switch. A signal pulse of 1.9-mJ energy at 1572-nm wavelength
was demonstrated. In the cavity, optimized with respect to single-pulse energy, a five-fold shortening of signal-pulse duration
with respect to 1064-nm pump radiation was observed. A twice as large level of signal peak power of 650 kW, compared to the
pump laser in the same cavity without the IOPO, was achieved. A conversion efficiency of 44% with respect to the 1064-nm pump
beam and 3.8% with respect to diode pump energy was demonstrated.
Received: 15 October 2002 / Revised version: 19 February 2003 / Published online: 16 April 2003
RID="*"
ID="*"Corresponding author. Fax: +48-22/666-8950, E-mail: wzendzian@wat.edu.pl 相似文献
3.
K. Drühl 《Applied physics. B, Lasers and optics》1998,66(6):677-683
I /kP=0.33and0.50. It is found that the ratio of pump depletion to maximal depletion as a function of the ratio of pump power to
threshold power agrees with the plane-wave prediction to within 5%, for a wide range of focusing conditions. The observed
trends are explained as resulting from intensity- and phase-dependent mechanisms.
Received: 19 January 1998/Revised version: 13 March 1998 相似文献
4.
A high-repetition-rate eye-safe optical parametric oscillator (OPO), using a non-critically phase-matched KTP crystal intracavity
pumped by an acousto-optically (AO) Q-switchedNd:YVO4 laser, is experimentally demonstrated. It is found that the average OPO signal power at 1573 nm can be efficiently increased
by increasing the pulse repetition rate. Moreover, the intracavity OPO process effectively shortens the pulse width so that
it is in the range 5∼8 ns for pulse repetition rates of 10 to 80 kHz. As a result of the relatively short pulse, the peak
power at 1573 nm is higher than 2 kW at a pulse repetition rate of 80 kHz.
Received: 10 July 2002 / Published online: 26 February 2003
RID="*"
ID="*"Corresponding author. Fax: +886-35/729-134, E-mail: yfchen@cc.nctu.edu.tw 相似文献
5.
Continuous-wave, intracavity optical parametric oscillators: an analysis of power characteristics 总被引:2,自引:0,他引:2
Received: 29 December 1997/Revised version: 6 February 1998 相似文献
6.
Low-threshold mid-infrared optical parametric oscillation in periodically poled LiNbO3 synchronously pumped by a Ti:sapphire laser 总被引:1,自引:0,他引:1
We report the generation of tunable high-repetition-rate optical pulses in the mid-infrared using synchronously pumped parametric
oscillation in periodically poled LiNbO3 (PPLN). Using a Kerr-lens-mode-locked Ti:sapphire laser as the pump source and a PPLN crystal incorporating grating periods
of 21.0–22.4 μm, we have achieved wavelength conversion in the -–4 6μm spectral range in the mid-infrared. The use of a semi-monolithic
cavity design and hemispherical focusing has permitted pulse generation in the strong idler absorption region of PPLN, resulting
in a simple, compact, all-solid-state configuration with a pump power threshold as low as 17 mW and mid-infrared idler powers
of up to 64 mW at 9% extraction efficiency. Signal output powers of up to 280 mW at 35% extraction efficiency are available
over the -–1.004 1.140μm spectral range at 80.5 MHz and pulse repetition rates at harmonics of the fundamental frequency up
to 322 MHz have also been obtained.
Received: 5 December 2000 / Revised version: 23 January 2001 / Published online: 27 April 2001 相似文献
7.
8.
Optical parametric oscillators for high pulse energy and high average power operation based on large aperture periodically poled KTP and RTA 总被引:3,自引:0,他引:3
M. Peltz U. Bäder A. Borsutzky R. Wallenstein J. Hellström H. Karlsson V. Pasiskevicius F. Laurell 《Applied physics. B, Lasers and optics》2001,73(7):663-670
We report on optical parametric oscillators (OPOs) based on large aperture periodically poled KTiOPO4 (PPKTP) and RbTiOAsO4 (PPRTA) pumped with high pulse energy and high average power Q-switched solid-state lasers. The OPOs were pumped with 1064-nm
pulses of a diode-pumped Nd:YVO4 laser at 20 kHz repetition rate. The emitted signal wavelengths were 1.72 μm and 1.58 μm and the idler wavelengths were 2.79 μm
and 3.26 μm, respectively. Pumping the PPKTP OPO with 7.2 W and the PPRTA OPO with 8 W average power, 2 W and 1.3 W total
OPO output powers were generated. Two-dimensional measurements of the total OPO output power, the signal wavelength and the
signal bandwidth in dependence on the crystal location indicated a good uniformity of the quasiphasematching structure over
the entire 3-mm-thick crystals. This allowed pumping with larger pump beams and therefore with pulse energies of tens of millijoules.
Pumping with different flash-lamp-pumped lasers, good OPO performance and high output pulse energies could be achieved for
all pump lasers. Maximum input pulse energies of 56 mJ gave output pulse energies of as much as 18 mJ. The temperature tuning
behaviors of both OPOs were measured, showing excellent agreement with calculated temperature tuning curves. New equations
for temperature dispersion in RTA are presented. These results show that large-aperture PPKTP and PPRTA crystals are well
suited for tunable nanosecond OPO operation with multi-watt average pump power and several tens of millijoules pump pulse
energies.
Received: 7 September 2001 / Published online: 7 November 2001 相似文献
9.
Single axial mode operation (<200 MHz optical bandwidth) of a high repetition rate periodically poled lithium niobate optical
parametric oscillator (OPO) has been obtained at signal wavelengths between 1.46 μm and 1.64 μm. OPO signal slope efficiencies
of 35% have been measured for repetition rates of 5–20 kHz. Single mode operation required spectral narrowing of both the
pump laser and the OPO. A simple technique of prelase Q-switching was implemented to reduce the optical bandwidth of the cw diode-pumped Nd:YAG pump laser to <1 GHz. A single intracavity
étalon was then sufficient to ensure single frequency oscillation of the OPO signal. The OPO output was stable with a smooth
spatial profile and an M
2 value of 1.3.
Received: 29 September 1999 / Published online: 27 January 2000 相似文献
10.
We report on an optical parametric amplifier (OPA) based on two potassium titanyl phosphate (KTP) crystals in a walk-off compensating
geometry. An Nd:YLF regenerative amplifier at a 1-kHz repetition rate serves as the pump source. The seed beam is delivered
by a synchronously pumped frequency-stabilized optical parametric oscillator (OPO) based on periodically poled lithium niobate
(PPLN). At pump intensities of about 7 GW/cm2 large amplification factors of more than 104 were achieved, resulting in pulse energies of more than 450 μJ and 350 μJ for the signal and idler pulses, respectively,
at a 1-kHz repetition rate. In the saturation regime the time–bandwidth product increases from two to three times the Fourier
limit, with a pulse duration of 105 ps and a bandwidth of 12.7 GHz at the highest intensities employed.
Received: 2 November 2001 / Published online: 14 March 2002 相似文献
11.
We report on a numerical analysis of the temporal and spatial beam properties of nanosecond optical parametric oscillators
(OPOs). The analysis is performed for a 355-nm-pumped critically phase-matched OPO of beta-barium borate. The calculations
provide detailed information on the dependence of the OPO beam quality (measured by the quality factor M
2) on pump energy. An important result is the strong increase of the M
2 value for pump energies exceeding 1–2 times the energy at threshold. Furthermore, a temporal analysis of single OPO pulses
indicates that the M
2 value strongly increases during the first few nanoseconds of the OPO oscillation. This increase is understood by considering
the temporal dynamics of the spatial profiles of the OPO signal beam and the depleted pump radiation.
Received: 1 April 1999 / Revised version: 26 July 1999 / Published online: 20 October 1999 相似文献
12.
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
13.
A miniaturized, high repetition rate, picosecond all solid state photo-induced distributed feedback (DFB) polymer-dye laser
is described by applying a passively Q-switched and frequency-doubled Cr4+:Nd3+:YAG-microchip laser (pulse width Δτ=540 ps, repetition rate ν=3 kHz, pump energy Epump=0.15 μJ) as a pump source. A poly-methylmethacrylate film doped with rhodamine B dye serves as active medium. The DFB-laser
pulses are temporally and spectrally characterized, and the stability of the thin polymer/dye film at high repetition rates
is analyzed. The shortest DFB-laser pulses obtained have a duration of 11 ps. After the emission of 350000 pulses the intensity
of the DFB-laser output has decreased by a factor of two and the pulse duration has increased by a factor of 1.2. For single
DFB-laser pulses of 20-ps duration the spectral bandwidth is measured to be Δλ=0.03 nm, which is only 0.005 nm above the calculated
Fourier limit assuming a Gaussian profile for the temporal shape of the pulses. Coarse wavelength tuning of the DFB laser
between 590 and 619 nm is done by turning the prism. Additionally, a fine tuning of the DFB-polymer-laser wavelength is achieved
by changing the temperature of the polymer/dye layer (=-0.05 nm/°C) in the range from 20 to 40 °C.
Received: 1 March 2001 / Revised version: 23 May 2001 / Published online: 18 July 2001 相似文献
14.
We report on the development of a pulsed diode end-pumped Nd:YAG laser mode-locked by a nonlinear mirror and stabilized by an acousto-optical modulator. With the introduction of appropriate intracavity loss, the laser is able to generate 22.8 ps pulses with the energy of 4.5 μJ. After amplification and frequency doubling stages, the second harmonic radiation is used to non-collinearly synchronously pump a β-barium borate optical parametric oscillator in a walk-off compensated scheme. The system demonstrates a wide-tuning range from 635 nm to 2.55 μm for the signal output, with maximum average conversion efficiency as high as 42%. 相似文献
15.
T.N. Kopylova V.B. Sukhanov G.V. Mayer A.V. Reznichenko M.S. Dolotov A.A. Shaposhnikov 《Applied physics. B, Lasers and optics》2002,74(6):545-547
The lasing properties of organic compounds in a polymethylmethacrylate matrix pumped by a copper vapor laser are studied.
The results demonstrate that the transverse pumping scheme of solid-state laser-active media with the copper vapor laser is
promising compared to the longitudinal pumping scheme from the viewpoint of the lifetime parameters.
Received: 6 February 2002 / Published online: 2 May 2002 相似文献
16.
A. Dubois S. Victori T. Lépine P. Georges A. Brun 《Applied physics. B, Lasers and optics》1998,67(2):181-183
Received: 15 December 1997/Revised version: 27 April 1998 相似文献
17.
S. Guha 《Applied physics. B, Lasers and optics》1998,66(6):663-675
Received: 15 February 1998/Revised version: 6 April 1998 相似文献
18.
M. Vainio J. Peltola S. Persijn F. J. M. Harren L. Halonen 《Applied physics. B, Lasers and optics》2009,94(3):411-427
Stability and tuning characteristics of continuous-wave optical parametric oscillators (CW OPOs) are affected by various thermal
effects arising from optical absorption in nonlinear crystals. In this paper, we present an experimental study of such effects
in a singly resonant CW OPO. The OPO operates in the 3-μm mid-infrared region and it is based on a MgO-doped periodically
poled lithium niobate crystal. We focus our study on two thermally induced phenomena that have been recently reported to exist
in singly resonant CW OPOs: optical bi-stability and thermal self-locking. Thermal self-locking effect, which is known to
alter the stability and tuning properties of doubly and triply resonant CW OPOs, is shown to be also of importance in singly
resonant OPOs. We report the stability and tuning characteristics of a thermally loaded OPO and discuss a simple temperature-tuning
method that can be used to scan the OPO idler frequency continuously over several THz. 相似文献
19.
M.E. Klein A. Robertson M.A. Tremont R. Wallenstein K.-J. Boller 《Applied physics. B, Lasers and optics》2001,73(1):1-10
We theoretically and experimentally investigate wavelength tuning of synchronously pumped optical parametric oscillators (OPOs)
on changing the cavity length or the pump-repetition rate. Conditions for rapid and wide-range wavelength access are derived.
Using an OPO pumped directly by a mode-locked diode-laser master-oscillator power-amplifier (MOPA) system, an all-electronically
controlled access to near- and mid-infrared wavelengths is demonstrated. The singly (signal) resonant OPO is based on periodically
poled lithium niobate (PPLN) and emits 8 ps idler pulses at a repetition rate of 2.5 GHz in the wavelength range 1986 to 2348 nm
(signal: 1530 to 1737 nm). Wavelength tuning over 114 nm (signal) and 189 nm (idler) is achieved solely by electronically
varying the repetition rate of the diode-laser oscillator over 720 kHz. By controlling the repetition rate with a programmable
driver, an arbitrary emission sequence of the OPO on two wavelength channels is generated, with access times as short as 10 μs.
11 OPO wavelengths equally spaced in the range 1627–1689 nm (signal) or 2054–2154 nm (idler) could be addressed.
Received: 6 September 2000 / Revised version: 16 March 2001 / Published online: 23 May 2001 相似文献
20.
B. Köhler U. Bäder A. Nebel J.-P. Meyn R. Wallenstein 《Applied physics. B, Lasers and optics》2002,75(1):31-34
We report on an injection-seeded 9.5-W 82-MHz-repetition-rate picosecond optical parametric generator (OPG) based on a 55 mm
long crystal of periodically poled lithium niobate (PPLN) with a quasi-phase-matching (QPM) grating period of 29.75 μm. The
OPG is excited by a continuously diode pumped mode-locked picosecond Nd:YVO4 oscillator-amplifier system. The laser system generates 7 ps pulses with a repetition rate of 82.3 MHz and an average power
of 24 W. Without injection-seeding the total average output power of the OPG is 8.9 W, which corresponds to an internal conversion
efficiency of 50%. The wavelengths of the signal and idler waves were tuned in the range 1.57–1.64 μm and 3.03–3.3 μm, respectively,
by changing the crystal temperature from 150 °C to 250 °C. Injection seeding of the OPG at 1.58 μm with 4 mW of single frequency
continuous-wave radiation of a distributed-feedback (DFB) diode laser increases the OPG output to 9.5 W (53% conversion efficiency).
The injection seeding increases the pulse duration and reduces the spectral bandwidth. When pumped by 10 W of 1.06 μm laser
radiation, the duration of the signal pulses increased from 3.6 ps to 5.5 ps while the spectral bandwidth is reduced from
4.5 nm to 0.85 nm. Seeding thus improved the time-bandwidth product from 1.98 to a value of 0.56, much closer to the Fourier
limit.
Received: 29 April 2002 / Published online: 8 August 2002 相似文献