共查询到20条相似文献,搜索用时 31 毫秒
1.
A.S. Grabtchikov A.N. Kuzmin V.A. Lisinetskii V.A. Orlovich A.A. Demidovich M.B. Danailov H.J. Eichler A. Bednarkiewicz W. Strek A.N. Titov 《Applied physics. B, Lasers and optics》2002,75(6-7):795-797
We present a diode-pumped Yb:KYW microchip laser. The passive Q-switchedand CW regimes of operation for the Yb:KYW microchip
laser have been investigated. An efficiency for CW operation of up to 10% with regard to incident pump has been obtained.
Raman self-frequency conversion in the Q-switched regime has been observed.
Received: 27 May 2002 / Revised version: 4 July 2002 / Published online: 15 November 2002
RID="*"
ID="*"Corresponding author. Fax: +375-17/2840-879, E-mail: asg@dragon.bas-net.by 相似文献
2.
L.E. Batay A.A. Demidovich A.N. Kuzmin A.N. Titov M. Mond S. Kück 《Applied physics. B, Lasers and optics》2002,75(4-5):457-461
A new laser medium – Yb,Tm:KY(WO4)2 – for diode pumped solid state laser applications operating around 1.9 to 2.0 μm has been investigated and the main laser
characteristics are presented. Diode pumping at 981 nm and around 805 nm was realised. For 981-nm pumping, the excitation
occurs into Yb3+ ions followed by an energy transfer to Tm3+ions. A slope efficiency of 19% was realised. For pumping around 805 nm, the excitation occurs directly into the Tm3+ ions. Here a maximum slope efficiency of 52%, an optical efficiency of 40%, and output powers of more than 1 W were realised.
Using a birefringent quartz plate as an intracavity tuning element, the tunability of the Yb,Tm:KY(WO4)2 laser in the spectral range of 1.85–2.0 μm has been demonstrated. The possibility of laser operation in a microchip cavity
configuration for this material has also been shown.
Received: 12 March 2002 / Revised version: 20 May 2002 / Published online: 25 September 2002
RID="*"
ID="*"Corresponding author. Fax: +49-531/592-4116, E-mail: stefan.kueck@ptb.de 相似文献
3.
A.J.S. McGonigle A.J. Andrews G.P. Hogan D.W. Coutts C.E. Webb 《Applied physics. B, Lasers and optics》2003,76(3):307-311
A 10-kHz pulse-repetition-frequency dye-laser master-oscillator power amplifier, end-pumped by a copper vapour laser (CVL),
is reported. This laser was based on recently available, lightweight and compact CVL and dye laser components. Dye laser tunability
was achieved from 592 to 622 nm and, when the oscillator was etalon line-narrowed, up to 1.5 W of single-etalon-mode output
was obtained from the amplifier at the 608-nm peak tuning wavelength. By frequency doubling this amplified output in a BBO
crystal we obtained up to 225 mW of 5-GHz 308-nm output, which is suitable for the performance of tropospheric hydroxyl radical
concentration measurements.
Received: 16 July 2002 / Revised version: 6 November 2002 / Published online: 5 February 2003
RID="*"
ID="*"Present address: Department of Geography, University of Cambridge, Cambridge, CB2 3EN, UK
RID="**"
ID="**"Corresponding author. Fax: +44-1865/272400, E-mail: d.coutts1@physics.ox.ac.uk 相似文献
4.
V.G. Savitski A.M. Malyarevich K.V. Yumashev B.D. Sinclair A.A. Lipovskii 《Applied physics. B, Lasers and optics》2003,76(3):253-256
Diode-pumped Nd:YVO4 and Nd:KGW lasers passively Q-switched with PbS-quantum dot-doped phosphate glass were demonstrated. For the Nd:YVO4 laser, pulses 110 ns in duration with a 13% Q-switching efficiency were obtained. The absorption recovery time of the PbS-doped
glass was measured to be 27±4 ps. Some recommendations for more efficient use of PbS-doped glasses for Q-switching of diode-pumped
lasers are suggested on the basis of our analysis.
Received: 29 July 2002 / Revised version: 18 September 2002 / Published online: 12 February 2003
RID="*"
ID="*"Corresponding author. Fax: +375-17/232-6286, E-mail: savitski@eudoramail.com 相似文献
5.
We demonstrate, for the first time to our knowledge, operation of a self-adaptive holographic laser with wavelength selection,
which uses Nd:YLF as the gain medium. The holographic laser was self-starting and, by virtue of the temporal dynamics in writing
the gain grating, passively Q-switched the cavity to produce pulses with 20–50 ns duration. A pulse energy of 184 mJ was obtained
from the system with beams having a TEM00 spatial profile. Single-longitudinal-mode operation was observed with near-transform-limited bandwidth.
Received: 30 July 2002 / Revised version: 1 October 2002 / Published online: 26 February 2003
RID="*"
ID="*"Corresponding author. Fax: +44-20/7594-7744, E-mail: s.y.lam@ic.ac.uk 相似文献
6.
E. Gehrig O. Hess C. Seibert D. Woll R. Wallenstein 《Applied physics. B, Lasers and optics》2003,76(3):285-288
We theoretically describe and experimentally investigate the spatio-spectral wave mixing of induced and spontaneous emission
in large-area InGaAs-semiconductor laser amplifiers. The dynamic light-matter-coupling is described by a spatially resolved
theory based on Maxwell–Bloch–Langevin equations, taking into account many-body-carrier interactions, energy transfer between
the carrier and phonon systems and, in particular, the spatio-temporal interplay of stimulated and amplified spontaneous emission
and the noise caused by spontaneous emission. Our numerical model reveals the fundamental physical processes which are responsible
for the spectral power distribution of the amplified laser light and predicts the emission properties of high-power semiconductor
laser amplifiers, such as emission spectra and input power–output power characteristics.
Received:30October2002/Revisedversion:21November2002 / Published online: 12 February 2003
RID="*"
ID="*"Corresponding author. Fax: +49-711/6862-349, E-mail: Edeltraud.Gehrig@dlr.de
RID="**"
ID="**"Also at: Institute of Physics, Tampere University of Technology, P.O. Box 692, FIN-33101, Tampere, Finland
RID="***"
ID="***"Present address: Heidelberger Druckmaschinen AG, Speyerer Strasse 6, 69115 Heidelberg, Germany
RID="****"
ID="****"Present address: Lightbit Corporation, 411 Clyde Avenue, Mountain View, CA 94043, USA 相似文献
7.
A. Di Lieto P. Minguzzi A. Pirastu S. Sanguinetti V. Magni 《Applied physics. B, Lasers and optics》2002,75(4-5):463-466
A Nd:YVO4 laser, end-pumped by a fiber-coupled diode-laser array, generates 7.3 W of output power at 1342 nm, the highest so far reported
for this host crystal. The slope efficiency is 40% and the output-beam divergence is close to the diffraction limit. An important
point in attaining such results is the choice of crystals with low Nd concentration.
Received: 16 July 2002 / Published online: 25 October 2002
RID="*"
ID="*"Corresponding author. Fax: +39-050/844333, E-mail: dilieto@df.unipi.it
RID="**"
ID="**"Permanent address: Scuola Normale Superiore, Piazza dei Cavalieri 7, Pisa, Italy 相似文献
8.
Multi-line laser transitions from one metastable triplet state to another at wavelengths of 2.92, 3.01, 2.69 and 2.60 μm have
been obtained through high pulse repetition frequency longitudinal discharge in a mixed gas of strontium vapor and helium
buffer gas. The intensity ratio of these laser lines was 5:4:4:1. As far as we know, these laser lines have never been reported
except for 3.01 μm. Some mechanisms for forming a population inversion are initially discussed on the basis of analyzing features
of corresponding energy-level structure and experimental phenomena. It is reasonable to name this kind of laser as an M–M
transition laser according to the feature of the lasing process.
Received: 15 October 2002 / Published online: 9 April 2003
RID="*"
ID="*"Corresponding author. Fax: +86-0571/8795-1328, E-mail: pbl66@zju.edu.cn 相似文献
9.
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
10.
Noise as reliability screening for semiconductor lasers 总被引:1,自引:0,他引:1
H. Guijun S. Jiawei G. Yinbing Y. Xiaosong L. Jing 《Applied physics. B, Lasers and optics》2003,76(4):359-363
The low-frequency electrical noise in semiconductor lasers is measured and used for device-reliability screening, which is
a sensitive and non-destructive method. In the experiment, we developed some approaches to improve the validity of reliability
screening by using noise criteria. A new method of determining the threshold level of noise criteria is given. The experimental
results show that this method is effective.
Received: 26 September 2002 / Revised version: 28 January 2003 / Published online: 9 April 2003
RID="*"
ID="*"Corresponding author. Fax: +86-431/462-7013, E-mail: huguijun@sina.com 相似文献
11.
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
12.
Ultrahigh-efficiency TEM00 operation is demonstrated in a diode-pumped Nd:YVO4 laser in a bounce amplifier geometry using a specially designed astigmatically optimised cavity configuration. Optical efficiency
>68% is demonstrated and up to 27.1 W of output power for multimode operation. For single-mode TEM00 operation, an output power of 23.1 W for 39.5 W of diode pumping was produced with beam propagation parameters of Mx
2=1.3 and My
2=1.1.
Received: 10 October 2002 / Revised version: 9 December 2002 / Published online: 19 March 2003
RID="*"
ID="*"Corresponding author. Fax: +44-20/7594-7744, E-mail: a.minassian@ic.ac.uk 相似文献
13.
Efficient room-temperature operation of 4
F
3/24
I
9/2 transitions in diode-end-pumped Nd:YAG lasers at 946 nm and 938.5 nm is reported. 7.0-W continuous-wave output power at 946 nm
and 3.9 W at 938.5 nm have been obtained. An analytical model has been developed for the quasi-three-level laser including
the influence of energy-transfer upconversion. Frequency doubling of these transitions in periodically poled KTP generated
blue light at 473 nm and 469 nm. Both single-pass extra-cavity as well as intracavity schemes have been investigated.
Received: 31 July 2002 / Published online: 5 February 2003
RID="*"
ID="*"Corresponding author. Fax: +46-8/750-5430, E-mail: stefan.bjurshagen@acreo.se 相似文献
14.
Costela A. García-Moreno I. Gómez C. Amat-Guerri F. Liras M. Sastre R. 《Applied physics. B, Lasers and optics》2003,76(4):365-369
We report on the laser action of modified dipyrromethene.BF2 complexes both dissolved in poly(methyl methacrylate) and copolymerized with methyl methacrylate. All recently synthesized
dyes have the chromophore core of laser dye pyrromethene 567, differing in the substituent in position 8. The new dyes showed
important and most significant increases in both lasing efficiency and photostability. When the laser samples were pumped
transversely at 534 nm, laser emission was obtained with efficiencies of over 30% in most cases, to be compared with a lasing
efficiency of 12% exhibited by reference dye pyrromethene 567 under the same experimental conditions. Some of the materials
exhibited highly photostable laser action, with no sign of degradation in the laser output after 60000 pump pulses at the
same position of the sample at a repetition rate of 10 Hz, whereas the laser emission of reference dye pyrromethene 567 dropped
to zero after less than 40000 pump pulses.
Received: 19 November 2002 /
Revised version: 20 February 2003 / Published online: 9 April 2003
RID="*"
ID="*"Corresponding author. Fax: +34-91/564-2431, E-mail: acostela@iqfr.csic.es 相似文献
15.
A.V. Podlipensky K.V. Yumashev N.V. Kuleshov H.M. Kretschmann G. Huber 《Applied physics. B, Lasers and optics》2003,76(3):245-247
Spectroscopic data of a V3+:YAG passive Q-switch crystal were measured. The absorption recovery time was determined to be of 37±7 ns and the ground state
absorption cross section was estimated to be 0.7×10-18 cm2 at 1.44 μm and 3.5×10-18 cm2 at 1.34 μm. Passively Q-switched operation of diode pumped 1.44 μm and 1.3 μm Nd:YAG lasers was demonstrated using this crystal
as saturable absorber. Average output powers of 1.42 W (1.44 μm) and 1.56 W (1.34 μm) and pulse energies of 24 μJ (1.44 μm)
and 25 μJ (1.34 μm) were observed, respectively.
Received: 19 August 2002 / Published online: 12 February 2003
RID="*"
ID="*"Corresponding author. Fax: +49-40/42838-6281, E-mail: kretschmann@physnet.uni-hamburg.de 相似文献
16.
Laser-driven micro-rocket 总被引:3,自引:0,他引:3
C.R. Phipps J.R. Luke G.G. McDuff T. Lippert 《Applied Physics A: Materials Science & Processing》2003,77(2):193-201
We have developed a new type of miniature rocket motor for pointing and positioning microsatellites. A specially prepared
tape with a transparent layer, through which the laser light passes, and an absorbing layer produce the thrust by the laser
ablation process. We have achieved a specific impulse of 1800 s (greater than possible with chemistry), and laser momentum
coupling coefficients of up to 50 dyn/W. The preprototype achieved 68 dyn of thrust. We discuss the target interaction physics
and some of our measurements with the preprototype thruster.
Received: 7 October 2002 / Accepted: 8 February 2003 / Published online: 28 May 2003
RID="*"
ID="*"Corresponding author. Fax: +1-505/4663-877, E-mail: crphipps@aol.com 相似文献
17.
S. Naumov E. Sorokin V.L. Kalashnikov G. Tempea I.T. Sorokina 《Applied physics. B, Lasers and optics》2003,76(1):1-11
We report stable self-starting near-transform-limited 26-fs pulses at 250-mW output power from a Kerr-lens mode-locked (KLM)
Cr4+:YAG laser using chirped mirrors in combination with prisms. The highest output power achieved in KLM regime was 600 mW at
55-fs pulse duration. The experimental results agree well with the results of theoretical analysis with respect to KLM self-starting
ability and stability against continuous-wave and multi-pulse operation. Parameter ranges for stable transform-limited KLM
pulses as well as the shortest achievable pulse durations are established. Using an InGaAs-InP semiconductor saturable absorber
mirror we could obtain self-starting 57-fs pulses at the average output power of 200 mW. Two-photon absorption was found to
be the main mechanism favoring the multiple-pulse operation.
Received: 2 May 2002 / Revised version: 16 July 2002 / Published online: 8 January 2003
RID="*"
ID="*"Corresponding author. Fax: +43-1/58801-38799, E-mail: sorokina@tuwien.ac.at 相似文献
18.
Jaiswal S.L. Simpson J.T. Withrow S.P. White C.W. Norris P.M. 《Applied Physics A: Materials Science & Processing》2003,77(1):57-61
The recent observation of optical gain from silicon nanocrystals embedded in SiO2 opens an opportunity to develop a nanoscale silicon-based laser. However, the challenge remains to design and develop a laser
architecture using CMOS-compatible materials. In this paper we present two designs for a waveguide laser in which silicon
nanocrystals embedded in SiO2 are used as the optical gain media. One design employs a SiO2 membrane containing encapsulated Si nanocrystals. Preliminary calculations given here show that a highly resonant laser cavity
can be produced in a SiO2 membrane using sub-wavelength structures. This photonic crystal architecture, used to guide and contain the light, can be
combined with a gain medium of optically active Si nanocrystals synthesized in the SiO2 membrane using ion implantation/thermal annealing to produce a Si-based laser. The laser cavity dimensions can be matched
to the near-infrared wavelengths where optical gain has been observed from Si nanocrystals. The second design utilizes silicon
nanocrystals embedded in a distributed-feedback laser cavity fabricated in SiO2. Lasing action over a broad wavelength range centered at ∼770 nm should be possible in both of these configurations.
Received: 20 December 2002 / Accepted: 7 January 2003 / Published online: 11 April 2003
RID="*"
ID="*"Corresponding author. Fax: +1-434/982-2037, E-mail: supriya@virginia.edu 相似文献
19.
Results are given for thermal tuning and modulation of a 1556-nm distributed feedback fibre laser by resistive heating of
a thin silver film chemically deposited on the fibre. Without reaching the limits of performance, linear tuning is demonstrated
at a rate of 1.72 pm/mW up to about 200 pm, and a peak-to-peak modulation of 100 MHz up to modulation frequencies of 60 Hz.
The heat flow is analyzed, and the coated fibre is characterized in terms of the static and dynamic wavelength response to
the applied electric power. The performance of the scheme is tested by recording part of the ν1+ν3 combination band spectrum of 13C2H2 with thermal modulation and scanning of the fibre laser.
Received: 12 March 2002 / Revised version: 24 June 2002 / Published online: 25 September 2002
RID="*"
ID="*"Corresponding author. Fax: +45/4593-1137, E-mail: sus@dfm.dtu.dk 相似文献
20.
100-W average-power, high-energy nanosecond fiber amplifier 总被引:5,自引:0,他引:5
J. Limpert S. Höfer A. Liem H. Zellmer A. Tünnermann S. Knoke H. Voelckel 《Applied physics. B, Lasers and optics》2002,75(4-5):477-479
We report on the fiber-based amplification of a Q-switched Nd:YAG thin-disk laser. At repetition rates between 3 and 50 kHz
output powers up to 100 W are generated. Pulse energies up to 4 mJ, with diffraction-limited beam quality, are generated in
a 30-μm Yb-doped large-mode-area fiber, furthermore pulse energies up to 8 mJ are achieved from a multimode fiber amplifier.
Received: 8 May 2002 / Revised version: 10 July 2002 / Published online: 25 October 2002
RID="*"
ID="*"Corresponding author. Fax: +49-3641/65-7680, E-mail: Jens.Limpert@uni-jena.de 相似文献