共查询到20条相似文献,搜索用时 15 毫秒
1.
O. Casel D. Woll M. A. Tremont H. Fuchs R. Wallenstein E. Gerster P. Unger M. Zorn M. Weyers 《Applied physics. B, Lasers and optics》2005,81(4):443-446
We report the generation of blue 489-nm picosecond laser pulses by intracavity second-harmonic generation in a mode-locked optically pumped InGaAs vertical-external-cavity surface-emitting laser. Mode locking achieved by a semiconductor saturable absorber mirror generated 5.8-ps-long sech2-shaped pulses at an emission wavelength of 978 nm and a repetition rate of 1.88 GHz. Intracavity frequency doubling in a 5-mm-long lithium triborate crystal generated blue picosecond pulses with a spectral width of 0.15 nm and an average output power of up to 6 mW. 相似文献
2.
E. Roissé V. Couderc A. Barthélémy F. Louradour 《Applied physics. B, Lasers and optics》1999,69(2):89-91
We report the first diode-pumped solid-state laser operating in cw-mode-locked regime and simultaneously achieving intracavity
frequency-tripling. This laser provide UV picosecond pulses (λ=355 nm) of 10 ps duration with 0.5 mW average power at 150 MHz
repetition rate. A different set of adjustments gave rise to a Q-switched mode-locked regime. Trains of hundred UV pulses
of 60 ps duration and 4 W peak power were produced in this latter case at 50 kHz repetition rate.
Received: 12 October 1998 / Revised version: 12 December 1998 / Published online: 26 May 1999 相似文献
3.
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
4.
F. Mitschke G. Steinmeyer M. Ostermeyer C. Fallnich H. Welling 《Applied physics. B, Lasers and optics》1993,56(6):335-342
Additive pulse mode locking applied to lamppumped Nd: YAG lasers results in an attractive source of picosecond pulses at 1.06 m or 1.32 m with average powers at the Watt level. We provide detailed information on construction and operation and give data on performance. A modified active stabilization scheme allows not only improved stability of operation but also insight into the dynamics of pulse formation. 相似文献
5.
High-power diode-pumped nonlinear mirror mode-locked Nd:YVO4 laser with periodically-poled KTP 总被引:2,自引:0,他引:2
We demonstrate a high-power nonlinear mirror (NLM) mode-locked Nd:YVO4 laser with a periodically poled KTP (PPKTP). With a 10-mm-long PPKTP crystal, 5.6 W of average power with 20-ps of pulse
duration was generated at 18-W of pump power. Compared with conventional type-II KTP crystal with the same length, the stability
against the Q-switched mode-locking (QML) is significantly increased with PPKTP in NLM laser; and the pulse duration was also
considerably reduced.
Received: 21 July 2000 / Revised version: 30 August 2000 / Published online: 10 January 2001 相似文献
6.
G. Q. Xie D. Y. Tang W. D. Tan H. Luo S. Y. Guo H. H. Yu H. J. Zhang 《Applied physics. B, Lasers and optics》2009,95(4):691-695
A diode-pumped passively mode-locked Nd: CTGG disordered crystal laser has been experimentally demonstrated for the first
time to our knowledge. Mode locked with a semiconductor saturable absorber mirror, the laser generated 5.2 ps pulses at a
repetition rate of 88 MHz. After intracavity dispersion compensation, the mode-locked pulses were shortened to 4.3 ps. Multiple
emission wavelengths of the Nd:CTGG laser could be synchronously mode locked under dispersion compensation. 相似文献
7.
Sumei Wang Qinan Li Qiulin Zhang Jie Xing Baohua Feng Shiwen Zhang 《Optics Communications》2007,277(1):130-133
Simultaneous self-Q-switched and mode-locked have been demonstrated in a diode-pumped Nd,Cr:YAG laser. For the first time as we know, almost 100% modulation depth has been achieved at an intracavity intensity of 5.6 × 105 W/cm2. The maximum average output power of 6.52 W corresponding to a slope efficiency of 30% is obtained at 1064 nm. The laser produces high-quality pulses in a TEM00-mode at the pump power of 16.5 W. The pulse duration of the mode-locked pulses is about 600 ps with 136 MHz repetition rate. 相似文献
8.
Efficient and compact intracavity-frequency-doubled Nd:GdVO4/KTP laser end-pumped by a fiber-coupled laser diode 总被引:2,自引:0,他引:2
D.Y. Shen H.R. Yang J.G. Liu S.C. Tam Y.L. Lam W.J. Xie J.H. Gu K. Ueda 《Applied physics. B, Lasers and optics》2001,72(3):263-266
A compact and efficient diode-pumped intracavity-frequency-doubled Nd:GdVO4/KTP green laser is demonstrated with a flat–flat cavity design. With a 1.3 at. % Nd3+-doped GdVO4 crystal and pumped at the weak-absorption peak of 806 nm, the second-harmonic output power at 532 nm was measured to be 1.95 W
at an incident pump power of 8.4 W, corresponding to an optical conversion efficiency of 23.2%. The output characteristic
at the fundamental wavelength of 1.063 μm was investigated with two different pump wavelengths. More than 4.5-W output power
was generated when the laser was pumped at 806.2 nm.
Received: 26 July 2000 / Revised version: 18 September 2000 / Published online: 7 February 2001 相似文献
9.
A low-cost multiple-walled carbon nanotubes/polyvinyl alcohol (MWCNTs/PVA) absorber was fabricated by the characteristics of high viscosity in large molecule PVA aqueous solution and vertical evaporation technique. Sandwich structured MWCNT/PVA absorber was constructed by a piece of MWCNT absorber, a piece of round quartz and a piece of reflective mirror. We exploited it to realize Q-switched mode locking operation in a diode-pumped Nd:YVO4 laser. The maximum average output power is about 630 mW. 相似文献
10.
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
11.
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
12.
A. Agnesi E. Piccinini G.C. Reali C. Solcia 《Applied physics. B, Lasers and optics》1997,65(2):303-305
Received: 27 May 1997/Revised version: 20 June 1997 相似文献
13.
Comparison between c-cut and a-cut Nd:YVO4 microchip lasers passively Q-switched with a Cr4+:YAG saturable absorber is experimentally made. The lower emission cross section of the c-cut Nd:YVO4 crystal can enhance the passive Q-switching effect to produce a peak power 10 times higher than that obtained with the a-cut
crystal. The experimental result further reveals that a c-cut Nd:YVO4 crystal is a very convenient material for short-pulse (sub-nanosecond) and high-peak-power (>10 kW) lasers.
Received:10December2001/Revisedversion:22January2002 / Published online: 14 March 2002 相似文献
14.
Soliton-like pulse-shaping mechanism in passively mode-locked surface-emitting semiconductor lasers 总被引:1,自引:0,他引:1
R. Paschotta R. Häring A. Garnache S. Hoogland A.C. Tropper U. Keller 《Applied physics. B, Lasers and optics》2002,75(4-5):445-451
We discuss a mechanism that allows the formation of nearly transform-limited soliton-like pulses in passively mode-locked
optically pumped external-cavity surface-emitting semiconductor lasers. It involves the interplay of positive dispersion and
the nonlinear index changes in gain medium and saturable absorber, while ordinary solitons are based on dispersion and the
Kerr effect. The obtained quasi-soliton pulses share some of the properties of ordinary solitons (in particular, their stability
and near bandwidth-limited nature), while other properties are different. In particular, the pulse duration scales with the
square root of the cavity dispersion, and an excessive drift of the laser wavelength must be avoided by proper design.
Received: 23 April 2002 / Published online: 25 September 2002
RID="*"
ID="*"Corresponding author. Fax: +41-1/633-1059, E-mail: Paschotta@iqe.phys.ethz.ch 相似文献
15.
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
16.
Green Output of 1.5 W from a Diode-Pumped Intracavity Frequency-Doubled Self-Q-Switched and Mode-Locked Cr,Nd:YAG Laser 下载免费PDF全文
We report a diode-pumped intracavity frequency-doubled self-Q-switched and mode-locked Cr,Nd:YAG/KTP green laser with a Z-type cavity, which produces 1.5 W of average power at 532nm with incident pump power 14.2 W. The individual mode-locked green pulse duration is about 560ps with 149 MHz repetition rate. Almost 100% modulation depth of the mode-locked green pulses is achieved at an incident pump power of 4.13 W. The maximum energy of Q-switched green pulse is 19.8μJ. The experimental results of pulse duration and pulse energy of Q-switched green pulse agree well with the theoretical calculations. 相似文献
17.
A. Brignon L. Loiseau C. Larat J.-P. Huignard J.-P. Pocholle 《Applied physics. B, Lasers and optics》1999,69(2):159-162
We demonstrate phase conjugation and dynamic holography by degenerate four-wave mixing in a continuous-wave diode-pumped Nd:YVO4 laser for the first time. A phase-conjugate reflectivity of 1.4% is obtained with a 12 W diode power. The experimental results
and the optimizing parameters, such as the cavity mirror reflectivities, are compared with results from a steady-state theoretical
analysis.
Received: 6 April 1999 / Published online: 24 June 1999 相似文献
18.
Changwen Xu Kunna He Dehua Li Yongdong Zhang Zhiguo Zhang 《Optics Communications》2008,281(17):4398-4400
We have demonstrated the stable mode-locked Nd:GdVO4 laser operating on the 4F3/2-4I9/2 transition at 912 nm. With a four-mirror-folded cavity and a semiconductor saturable absorber mirror for passive mode-locking, we have gained 6.5 ps laser pulses at a repetition rate of 178 MHz. The laser is diode-end-pumped, and the total output power from the out coupler is 128 mw at an incident pump power of 19.7 W. 相似文献
19.
A low-threshold passively continuous-wave (CW) mode-locked Nd:YVO4 solid-state laser was demonstrated by use of a semiconductor saturable absorber mirror (SESAM). The threshold for continuous-wave mode-locked is relatively low, about 2.15 W. The maximum average output power was 2.12 W and the optical to optical conversion efficiency was about 32%. The pulse width was about 15 ps with the repetition rate of 105 MHz. 相似文献
20.
Qinan Li Sumei Wang Yuxian Shi Dongxiang Zhang Zhiguo Zhang 《Optics Communications》2008,281(8):2184-2188
A simultaneous self-Q-switched and mode-locked diode-pumped 946 nm laser by using a Cr,Nd:YAG crystal as gain medium as well as saturable absorber is demonstrated for the first time as we know. The maximum average output power of 751 mW with a slope efficiency of 18.38% is obtained at an intra-cavity average peak power intensity of 4.83 × 106 W/cm2. Under this circumstance, the repetition rate of Q-switched envelopes is 9.63 kHz and the pulse width is about 460 ns. Almost 100% mode-locked modulation depth is obtained at all time in the experiment process whether the incident pump power is low or high. The repetition rate of mode-locked pulses within a Q-switched envelope is 135.13 MHz and the mode-locked pulse width is within 600 ps. The laser produces high-quality pulses in TEM00-mode in the simultaneous self-Q-switched and mode-locked experiment. 相似文献