共查询到20条相似文献,搜索用时 62 毫秒
1.
J. D. Kafka M. L. Watts J. W. Pieterse R. L. Herbst 《Applied physics. B, Lasers and optics》1995,60(5):449-452
We describe a synchronously pumped LBO parametric oscillator pumped by a cw mode-locked Ti:Sapphire laser. We demonstrate the synchronization between the pump pulses and the signal pulses by measuring a 100 fs cross correlation. We then generate pulses tunable from 2.6 to 5.3 µm by mixing the signal and idler pulses in an AgGaS2 crystal and obtain as much as 400 µW of average power. 相似文献
2.
Picosecond pulses from a mode-locked Nd:YAG laser and a traveling-wave dye laser are mixed in an AgGaS2 crystal to generate pulses at the difference frequency. The dye laser is tunable between 1200 nm and 1460 nm resulting in a tuning range of the parametric pulses from 3.9 μm to 9.4 μm. The spectral bandwidth is quite narrow. A value of Δ?=6.5 cm-1 was measured which is constant over the whole tuning range. Several percent of the Nd:YAG laser photons are converted to infrared photons. Pump pulses of 21 ps give parametric pulses of 8 ps. 相似文献
3.
4.
K. L. Vodopyanov 《Optics Communications》1998,150(1-6):210-212
Infrared pulses, continuously tunable in the 8–13 μm range, and with up to 1 MW peak power, have been achieved using single-stage frequency conversion in a CdSe travelling-wave optical parametric generator, pumped by 100 ps pulses from an actively mode-locked, Q-switched and cavity dumped 2.8 μm Cr,Er:YSGG laser. The external quantum conversion efficiency reached 10%. 相似文献
5.
Weibin Wang Fei Wang Yu Zhang Huan Ma Qiong Yu Xin Zhang 《Journal of Russian Laser Research》2016,37(3):265-272
We present an experimental demonstration of a passively mode-locked figure-eight fiber laser (F8L) based on a power-imbalanced nonlinear optical loop-mirror (PI-NOLM) comprising a section of 25 m long high-nonlinear fiber (HNLF) and a tunable attenuator (ATT). The asymmetric power, which results in different nonlinear phase shifts on the clockwise (CW) and counter-clockwise (CCW) directions, is achieved using an ATT. We greatly reduce the length of the nonlinear cavity, which can effectively diminish the interference from external environment. A balanced optical coupler (OC) and an ATT act as a tunable OC. So, a stable mode-locked pulse train with full width at half maximum (FWHM) of ~571 fs and signal-to-noise ratio (SNR) of ~60 dB is obtained. 相似文献
6.
Cho WB Kim JW Lee HW Bae S Hong BH Choi SY Baek IH Kim K Yeom DI Rotermund F 《Optics letters》2011,36(20):4089-4091
High-quality monolayer graphene as large as 1.2×1.2?cm2 was synthesized by chemical vapor deposition and used as a transmitting saturable absorber for efficient passive mode-locking of a femtosecond bulk solid-state laser. The monolayer graphene mode-locked Cr:forsterite laser was tunable around 1.25?μm and delivered sub-100?fs pulses with output powers up to 230?mW. The nonlinear optical characteristics of the monolayer graphene saturable absorber and the mode-locked operation were then compared with the case of the bilayer graphene saturable absorber. 相似文献
7.
A.J. Schmidt 《Optics Communications》1975,14(3):287-289
A novel system for generating single tunable ultrashort light pulses of high power is described. The pulse train from a mode-locked flashlamp pumped dye laser passes through an amplifier, which is pumped by an N2 laser. As gain is only available for a few nsec, only one pulse in the train gets amplified. The energy of the resulting single pulse is about 100 μJ. 相似文献
8.
Tunable picosecond pulses in the ultraviolet region down to 197 nm with ? 20 kW peak power are generated by the sum frequency mixing of fourth or third harmonic pulses of a mode-locked YAG laser with tunable pulses produced by a LiNbO3 parametric oscillator pumped by second harmonic pulses of the YAG laser by using a KB5 or KDP crystal. 相似文献
9.
High-power picosecond LiB3O5 optical parametric oscillators tunable in the blue spectral range 总被引:2,自引:0,他引:2
The paper reports on an experimental investigation and numerical analysis of noncritically and critically phasematched LiB3O5 (LBO) optical parametric oscillators (OPOs) synchronously pumped by the third harmonic of a cw diode-pumped mode-locked Nd:YVO4 oscillator–amplifier system. The laser system generates 9.0 W of 355-nm mode-locked radiation with a pulse duration of 7.5 ps
and a repetition rate of 84 MHz. The LBO OPO, synchronously pumped by the 355-nm pulses, generates a signal wave tunable in
the blue spectral range 457–479 nm. With a power of up to 5.0 W at 462 nm and 1.7 W at 1535 nm the conversion efficiency is
74%. The OPO is characterized experimentally by measuring the output power (and its dependence on the pump power, the transmission
of the output coupler and the resonator length) and the pulse properties (such as pulse duration and spectral width). Also
the beam quality of the resonant and nonresonant waves is investigated. The measured results are compared with the predictions
of a numerical analysis for Gaussian laser and OPO beams. In addition to the blue-signal output visible-red 629-nm radiation
is generated by sum-frequency mixing of the 1.535-μm infrared idler wave with the residual 1.064-μm laser radiation. A power
of 1.25 W of 1.535-μm idler radiation and 5.7 W of 1.064-μm laser light generated a red 629-nm output power of 2.25 W.
Received: 2 February 2000 / Revised version: 28 July 2000 / Published online: 22 November 2000 相似文献
10.
Rumao Tao Xiaolin Wang Pu Zhou Lei Si Zejin Liu 《Applied physics. B, Lasers and optics》2014,116(1):115-119
A widely tunable mode-locked all-fiberized Yb-doped fiber laser with near-transform-limited spectrum linewidth is used. It consists of a tunable fiber Bragg grating (TFBG) and a fiber-coupled LiNbO3 phase modulator (PM) in a linear cavity. The TFBG is used to achieve tunable emission wavelength, and the intracavity PM is used to achieve actively mode-locking operation. We have experimentally demonstrated that the laser-emitting wavelength can be tuned between 1,041 and 1,091 nm with power fluctuation less than 3 dB. The temporal width of the laser pulse is about 1 ns, and the pulses are near transform-limited with a spectral linewidth of 1.3 GHz. The results may find useful application in optical communication and optical measurement system. 相似文献
11.
The transition state between the continuous wave region and the mode-locked region in a passively mode-locked erbium-doped fibre ring laser has been experimentally observed by utilizing the nonlinear polarization rotation technique.When the pump power reaches the mode-locked threshold,the metastable pulse train with a tunable repetition rate is obtained in the transition from the continuous wave state to the passive mode-locked state via proper adjustment of the polarization controller.A simple model has been established to explain the experimental observation. 相似文献
12.
Seitz W Schibli TR Morgner U Kärtner FX Lange CH Richter W Braun B 《Optics letters》2002,27(6):454-456
By optical modulation of the reflectivity of an intracavity nonlinear Fabry-Perot semiconductor mirror, the pulse train from a passively mode-locked picosecond Nd:YVO(4) laser oscillator is synchronized to an independent femtosecond-mode-locked Ti:sapphire laser. We obtain stable synchronized pulse trains at central wavelengths of 1064 and 850 nm, and the Ti:sapphire laser is still independently tunable over a large wavelength range. The tolerable cavity-length difference between the two laser oscillators exceeds 20mu;m . 相似文献
13.
In this paper, we demonstrate a widely tunable passively mode-locked fiber laser covering the C or L band with carbon nanotube
films. Our results show that the saturable absorber incorporating nanotubes (SAINT) has potential for constructing widely
tunable passively mode-locked fiber laser. 相似文献
14.
A. Ferrario 《Optics Communications》1979,30(1):85-86
We report in this letter the characteristic of a picosecond dye laser, tunable in the 1.08–1.12 μm range. The dye is pumped by the fundamental of a mode-locked Nd-YAG laser. The energy conversion efficiency is higher than 10% and the pulse duration is less than 10 ps. 相似文献
15.
The operation of a continuous-wave mode-locked silver gallium selenide (AgGaSe2) optical parametric oscillator (OPO) is reported. The OPO was synchronously excited by 120-fs-long pulses of 1.55-μm radiation
at a repetition rate of 82 MHz. The 1.55-μm radiation is generated by a noncritically phasematched cesium-titanyl-arsenate
(CTA)-OPO pumped by a mode-locked Ti:sapphire laser. The AgGaSe2-OPO generates signal and idler radiation in the range from 1.93 μm to 2.49 μm and from 4.1 μm to 7.9 μm, respectively. Up
to 67 mW of signal wave output power has been obtained. The experimentally determined pulse duration and chirp parameters
are in reasonable agreement with results from a numerical model taking into account group velocity mismatch, group velocity
dispersion, self phase modulation, and chirp enhancement.
Received: 6 August 1999 / Revised version: 4 October 1999 / Published online: 3 November 1999 相似文献
16.
锁模脉冲波长连续可调谐光纤激光器 总被引:2,自引:1,他引:1
利用在腔内加入可调谐光纤光栅滤波器使“8”字形腔掺Yb3+光纤激光器在锁模状态下实现波长连续可调谐.实验中,在保证锁模状态稳定的情况下,通过调节可调谐光纤光栅滤波器,使激光器输出锁模脉冲的中心波长在1 047 nm~1 055 nm范围内连续调谐,重复频率稳定维持在4.9 MHz.在中心波长1 053 nm处,测得锁模脉冲输出平均功率为8.02 mW,光谱带宽1 nm,脉冲宽度为259.3 ps.这种“8”字形腔被动锁模光纤激光器在锁模状态下对波长连续可调谐,并可长时间稳定工作. 相似文献
17.
B. Couillaud A. Ducasse A. Dienes 《Applied Physics A: Materials Science & Processing》1980,23(2):135-140
A laser system capable of generating picosecond pulses of 2 ps duration and peak powers of up to 50 MW, tunable throughout
the emission spectrum of the lasing medium is described. The system consists of a cw dye laser which is tuned and is actively
mode-locked by means of a novel interferometer. Single-pulse amplification is achieved via a two-stage N2-laser-pumped amplifier arrangement. One of the most attractive features of the system here described is its inherent versatile
broad tunability, which should allow, with different lasing media and pump sources, ps pulse generation from 400 to 700 nm
using the same interferometer device. 相似文献
18.
A novel tunable dual-wavelength external-cavity laser diode array and its applications 总被引:1,自引:0,他引:1
We review the principles and characteristics of a novel tunable external-cavity laser diode source. It can operate as either a continuous wave (CW) single-wavelength, a CW dual-wavelength, a single-wavelength mode-locked, or a tunable dual-wavelength mode-locked laser. The gain medium is a commercial laser diode array. The telescopic external cavity consists of a grazing-incidence grating, a lens and a stripe-mirror. The external cavity provides functions of wavelength selection, dispersion compensation and spatial mode control. The characteristics of the laser under CW or mode-locked operation are described. The dual-wavelength laser output exhibits beat note beyond 7 THz. The tunable multi-terahertz beat frequency is characterized by a non-collinear intensity autocorrelation technique. A dual-wavelength interferometer that uses a tunable dual-wavelength laser as the light source is demonstrated. Finally, theoretical analysis is presented, which demonstrates that the dual-wavelength output of the laser is stable if the modes at the two wavelengths correspond to different array lateral modes. 相似文献
19.
Results are presented on the operation and optimization of soliton Raman fibre-ring lasers using a c.w. mode-locked Nd-YAG laser at 1.32m as the source of 100 ps pump pulses. Various lengths of standard single-mode silica fibre were used, and tunable pulses as short as 100 fs generated.On leave from Departamento de Fisica, Universidade Federal de Alagoas, Maceio, 57000-AL, Brazil 相似文献
20.
Light at 1.06 μm from a mode-locked Nd:YAG laser has been successfully down-converted by two vibrational stimulated Raman shifts in H2 gas. Approximately 1 MW of power was produced at second-Stokes wavelength, 9.20 μm. Many other rational and vibrational shifts were observed, up to the seventh anti-Stokes at 260 nm. 相似文献