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1.
High energy and long pulse generation with high-birefringence photonic crystal fibre and laser-diode pumped regenerative amplifier 下载免费PDF全文
We report on the generation of a high energy and long
pulse for pumping optical parametric chirped-pulse amplification
(OPCPA) by a high-birefringence photonic crystal fibre (HB-PCF) and
a laser-diode-pumped regenerative chirped pulse amplifier. Using the
femtosecond pump pulse centred at 815~nm, a 1064~nm soliton pulse is
produced in the HB-PCF. After injecting it into an Nd:YAG
regenerative amplifier with the glass etalons, a narrow-band
amplified pulse with an energy of $\sim $4~mJ and a duration of 235
ps is achieved at a repetition rate of 10~Hz, which is suitable for
being used as a pump source in the 800~nm OPCPA system. 相似文献
2.
HUANG Feng LOU Qihong 《Chinese Journal of Lasers》1999,8(1):15-20
1IntroductionExcimerlasersarethepulsedgaslaserwhichoperateatanumberoffixedwavelengthsintheregionofultraviolet.However,itspuls... 相似文献
3.
An all-solid-state high power quasi-continuous-wave tunable dual-wavelength Ti:sapphire laser system using birefringence filter 下载免费PDF全文
This paper describes a tunable dual-wavelength Ti:sapphire laser system with
quasi-continuous-wave and high-power outputs. In the design of the laser, it
adopts a frequency-doubled Nd:YAG laser as the pumping source, and the
birefringence filter as the tuning element. Tunable dual-wavelength outputs
with one wavelength range from 700~nm to 756.5~nm, another from 830~nm to 900mn
have been demonstrated. With a pump power of 23~W at 532~nm, a repetition rate
of 7~kHz and a pulse width of 47.6~ns, an output power of 5.1~W at 744.8~nm and
860.9~nm with a pulse width of 13.2~ns and a line width of 3~nm has been
obtained, it indicates an optical-to-optical conversion efficiency of
22.2{\%}. 相似文献
4.
5.
We report direct spectral and temporal characterization of ultrashort ultraviolet (UV) pulses resulting from third-harmonic generation by high-intensity Ti: sapphire laser radiation in the atmosphere. The experimental technique implemented in this work enables the measurement of the pulse width and the chirp of the UV field, as well as the electron density of the plasma produced by laser pulses. The bandwidth of the third harmonic generated in our experiments by laser pulses with an initial pulse width of 45 fs supports transform-limited UV pulses as short as 30 fs. 相似文献
6.
The generation of lower (third) and higher harmonics of femtosecond laser radiation in plasmas produced by laser ablation
of different targets with a small atomic number Z (B, Be, Li) has been investigated. The high (10−3) efficiency of third-harmonic generation was observed in plasma produced on the boron surface. Efficient third-harmonic generation
was also observed in beryllium plasma using femtosecond pulses of Ti:sapphire laser radiation (λ = 790 nm) and its second
harmonic (395 nm). We could tune the higher harmonics generation spectrum by tuning the crystal converter when using 395-nm
radiation to be converted. It is shown that, in plasmas formed on targets with small Z, the conversion efficiency and limiting generated harmonic order depend on the delay between the ablation pulse and the pulse
to be converted. 相似文献
7.
We systematically study the optimization of highly efficient terahertz(THz) generation in lithium niobate(LN)crystal pumped by 800 nm laser pulses with 30 fs pulse duration. At room temperature, we obtain a record optical-to-THz energy conversion efficiency of 0.43% by chirping the pump laser pulses. Our method provides a new technique for producing millijoule THz radiation in LN via optical rectification driven by joule-level Ti:sapphire laser systems, which deliver sub-50-fs pulse durations. 相似文献
8.
Performance of gain-switched all-solid-state quasi-continuous-wave tunable Ti:sapphire laser system 下载免费PDF全文
We have made a gain-switched all-solid-state quasi-continuous-wave (QCW) tunable Ti:sapphire laser system, which is pumped by a 532 nm intracavity frequency-doubled Nd:YAG laser. Based on the theory of gain-switching and the study on the influencing factors of the output pulse width, an effective method for obtaining high power and narrow pulse width output is proposed. Through deliberately designing the pump source and the resonator of the Ti:sapphire laser, when the repetition rate is 6 kHz and the length of the cavity is 220 mm, at an incident pump power of 22 W, the tunable Ti:sapphire laser from 700 to 950nm can be achieved. It has a maximum average output power of 5.6W at 800nm and the pulse width of 13.2 ns, giving an optical conversion efficiency of 25.5% from the 532 mn pump laser to the Ti:sapphire laser. 相似文献
9.
10.
S. O. Konorov A. B. Fedotov W. Boutu E. E. Serebryannikov D. A. Sidorov-Biryukov Yu. N. Kondrat’ev V. S. Shevandin K. V. Dukel’skiĭ A. V. Khokhlov A. M. Zheltikov 《Optics and Spectroscopy》2004,96(4):575-579
We experimentally demonstrate highly efficient multiplex frequency conversion of unamplified subnanojoule femtosecond pulses of Ti:sapphire laser radiation in fused silica microstructure fibers. Nonlinear optical spectral transformation of femtosecond pulses in an array of fused silica threadlike channels in these microstructure fibers results in the generation of isolated anti-Stokes spectral components within the wavelength range of 400–500 nm. An efficiency of frequency conversion of about 20% is achieved for 800-nm pump pulses with an energy of 0.7 nJ and a pulse duration of 70 fs. 相似文献
11.
K_3B_6O_(10)Cl(KBOC), a new nonlinear optical crystal, shows potential advantages for the generation of deep ultraviolet(UV) light compared with other borate crystals. In this paper we study for the first time the second harmonic generation(SHG) of a femtosecond Ti:sapphire amplifier with this crystal. Laser power is obtained to be as high as 220 m W at the central wavelength of 396 nm with a 1-mm-long crystal, and the maximum SHG conversion efficiency reaches 39.3%. The typical pulse duration is 83 fs. The results show that second harmonic(SH) conversion efficiency has the room to be further improved and that the new nonlinear crystal is very suited to generate the high efficiency deep ultraviolet laser radiation below 266 nm. 相似文献
12.
Generation of sub-50fs vacuum UV pulses with more than 2.5μJ energy at a 1kHz repetition rate is reported. The pulses at 160nm are produced using noncollinear difference-frequency four-wave mixing between the fundamental and third harmonics of an amplified Ti:sapphire laser in argon. While the pulse duration is maintained by increasing the phase-matching pressure, noncollinear interaction improves the conversion efficiency by 1 order of magnitude in comparison with the previous results in collinear geometry. 相似文献
13.
Tomoko Imasaka Tomoya Okuno Totaro Imasaka 《Applied physics. B, Lasers and optics》2013,113(4):543-549
The temporal profile of the second and third harmonic emissions of a Ti:sapphire laser was measured using an autocorrelator consisting of a mass spectrometer as a two-photon-response detector. A number of organic compounds that are potentially applicable for two-photon excitation and subsequent one-photon ionization were investigated using density functional theory calculations. N,N′-dimethylaniline and acetonitrile were used for the measurement of the pulse width for the second and third harmonic emissions of the Ti:sapphire laser. This approach has the potential for use in measuring pulse widths as short as 1–3 fs in the ultraviolet region. 相似文献
14.
飞秒紫外激光脉冲振荡的实验研究 总被引:1,自引:0,他引:1
本文讨论了采用空间光脉冲光谱的啁啾特性和选择聚焦透镜焦距相结合的技术大大提高二次谐波转换效率和产生紫外飞秒光脉冲的实验研究.采用一类相位匹配的BBO晶体,当飞秒钛宝石光脉冲平均功率为560mW时,二次谐波输出功率为352mW,二次谐波转换效率高达63%;采用一类相位匹配的LBO晶体时,获得高光束质量的倍频蓝光输出,输出平均功率为170mW,转换效率大于30%.运用LBO倍频产生的蓝光脉冲和剩余的基频光脉冲进行了三次谐波的振荡研究.三倍频晶体采用BBO,通过优化设计倍频光与基频光之间的空间模匹配及精确时间延迟,得到飞秒紫外光输出,输出功率为2mW,中心波长约为280nm,重复率为100MHz. 相似文献
15.
D.?Depenheuer J.?Kohl-Landgraf H.?Gl??er T.?Walther 《Applied physics. B, Lasers and optics》2009,97(3):583-589
We report on an injection-seeded Ti:sapphire laser pumped by the second harmonic of a Nd:YAG laser. Due to an excellent spatial
beam profile and narrow linewidth near the Fourier transform limit we are able to achieve high conversion efficiencies and
stable output power in harmonic generation as well as in sum and difference frequency mixing with the pump pulse. The laser
system can potentially cover a spectral range from 190 to over 6000 nm. 相似文献
16.
17.
高效全固化紫外四倍频激光器的研究 总被引:7,自引:0,他引:7
用半导体激光器抽运的调Q YLF倍频激光器抽运掺钛蓝宝石激光器,用LBO晶体在腔内产生二次谐波,再聚焦到BBO晶体上产生四次谐波深紫外激光。为了提高谐波转换效率,在腔内分别插入了单片、组合双折射滤光片和聚焦透镜,在平均功率为3.6W,波长为527nm的抽运光下得到410mW,417nm的蓝光。用长焦距的透镜聚焦二次谐波,得到34mW,208nm的紫外脉冲激光。从实验上详细研究了基频光的线宽对二次谐波效率的影响,二次谐波的线宽对四次谐波效率的影响、基频光的波长对四次谐波产生效率的影响。全面地分析了单片和组合大拆射滤光片及抽运功率对钛蓝宝石激光器基频光的脉宽、线宽等参量的影响。 相似文献
18.
Efficient frequency upshift of 10fs laser pulsespropagating in a 5-cm length birefringent photonic crystal fibre 下载免费PDF全文
This paper reports that a 5-cm length birefringent photonic crystal
fibre is used to tune the output frequency of unamplified 10-fs Ti:sapphire pulses. The zero dispersion of the fibre is at 823~nm and
800~nm for slow and fast fundamental modes, respectively. It is
demonstrated that efficient upshift of the output frequency can be
achieved when the pumped radiation is polarized along the slow axis
of the fibre. When the average input power reaches 320~mW, about
60% of the output energy is located in one peak at 600~nm and is
accompanied by depletion of the pulse inside the anomalous
dispersion region. 相似文献
19.
The third harmonic generation(THG) of a linear cavity Ti:sapphire regenerative amplifier by use of a K_3B_6O_(10)Cl(KBOC) crystal is studied for the first time. Output power up to 5.9 mW is obtained at a central wavelength of 263 nm,corresponding to a conversion efficiency of 4.5% to the second harmonic power. Our results show a tremendous potential for nonlinear frequency conversion into the deep ultraviolet range with the new crystal and the output laser power can be further improved. 相似文献
20.
A. V. Konyashchenko L. L. Losev V. S. Pazyuk S. Y. Tenyakov 《Applied physics. B, Lasers and optics》2008,93(2-3):455-461
The technique of Raman conversion of sub-100 fs laser pulses based on excitation of active medium by two orthogonally polarized pulses has been developed for Raman lasers with a glass capillary. 52 fs Stokes pulse at the wavelength of 1200 nm has been generated by stimulated Raman scattering of 48 fs Ti:sapphire laser pulse at the wavelength of 800 nm in hydrogen. 13% energy conversion efficiency has been achieved at pulse repetition rate up to 2 kHz. 相似文献