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1.
An XeCl laser beam has been used to investigate stimulated Raman scattering in H2 and in various H2-foreign gas mixtures. Helium, neon, argon, and nitrogen have been tested as foreign gases. In all the investigated mixtures with 50% of H2, the energy conversion efficiency to the first Stokes (353 nm) was more than 70% higher than that obtained in H2 at the same total pressure (40 bar) and pump energy (60 mJ). The dependence of the energy conversion efficiency on pump beam divergence has also been investigated. 相似文献
2.
Hongwei Chu Jia Zhao Yufei Li Shengzhi Zhao Kejian Yang Dechun Li Guiqiu Li Tao Li Wenchao Qiao 《Applied physics. B, Lasers and optics》2014,117(3):869-873
By using a doubly passively Q-switched Nd:Gd3Ga5O12(Nd:GGG) laser with Cr4+:YAG and GaAs as saturable absorbers as pump laser, simultaneous intracavity optical parametric oscillation and stimulated Raman scattering based on a single X-cut KTiOPO4 (KTP) crystal have been realized. Under an incident diode pump power of 10.5 W, the output powers at the signal wave near 1,569 nm and the first Stokes emission near 1,094 nm were 218 and 72 mW, corresponding to the optical-to-optical conversion efficiencies of 2.08 and 0.69 %, respectively. The measured shortest pulse duration at the signal wave near 1,569 nm was 580 ps, generating a pulse peak power of 43.7 kW, while the minimum pulse duration at the first Stokes emission near 1,094 nm was 1.61 ns. By adjusting the tilt angle of the KTP crystal, up to the third Stokes scattering was also obtained. 相似文献
3.
X. H. Chen P. Li X. Y. Zhang Q. P. Wang Z. J. Liu Z. H. Cong L. Li H. J. Zhang 《Laser Physics》2012,22(1):60-63
A highly efficient 880 nm laser diode pumped actively Q-switched Nd:YVO4/BaWO4 eye-safe Raman laser is demonstrated. With an absorbed pump power of 10.9 W, 1.7 W of average output power at the Stokes
wave-length is generated at a PRF of 40 kHz, corresponding to a diode-to-Stokes conversion efficiency of 15.6%. 相似文献
4.
Generation of UV and VIS laser light by stimulated Raman scattering in H2, D2, and H2/He using a pulsed Nd:YAG laser at 355 nm 总被引:3,自引:0,他引:3
A.D. Papayannis G.N. Tsikrikas A.A. Serafetinides 《Applied physics. B, Lasers and optics》1998,67(5):563-568
2 ), deuterium (D2), and mixtures of hydrogen and helium (H2/He), versus Raman gas pressure and input pump energy of the pulsed Nd:YAG laser at 355 nm, are reported. Photon conversion
efficiencies of 50% and 27% are achieved at the first Stokes lines (S1) in H2 and D2, respectively. As a result, ultraviolet and visible laser light (274–503 nm) was generated with energies ranging from a few
mJ up to several tens of mJ.
Received: 5 January 1998/Revised version: 3 June 1998 相似文献
5.
A. A. Kananovich S. V. Voitikov A. A. Demidovich M. B. Danailov V. A. Orlovich 《Applied physics. B, Lasers and optics》2012,106(1):9-17
The paper presents experimental investigation and modeling of an end-pumped quasi-continuous-wave YVO4/Nd:YVO4 mini self-Raman laser. The dependence of the Stokes output power on the pump power in the range from 3 to 17.5 W has been
measured. As much as 1.76 W of an average Stokes power, corresponding to a total optical-to-optical conversion efficiency
of about 10%, has been obtained. The transverse profiles of the laser (at the fundamental wavelength) and the Stokes beam
intensity have been recorded at the output mirror and in the vicinity of the boundary between the pure and Nd-doped parts
of the Raman crystal. These distributions have been approximated by the sum of Gaussian and super-Gaussian distributions with
corresponding weights. We propose a model of such lasers that takes into account the features of intracavity self-frequency
Raman conversion in lasers with highly inhomogeneous non-Gaussian spatial distributions of the pump, laser, and Stokes beam
intensity in the cavity. The results of modeling are in good agreement with the experimental data. 相似文献
6.
We report a continuous-wave (CW) coherent green radiation at 533 nm by intracavity frequency doubling generation of 1066 nm
Nd:LuVO4 laser. With incident pump power of 18.2 W, output power of 4.3 W at 533 nm has been obtained using a 5 mm-long LBO crystal.
The optical conversion efficiency was up to 23.6%. At the output power level of 4.3 W, the output stability is better than
3%. The beam quality M2 values were equal to 1.13 and 1.21 in X and Y directions, respectively. 相似文献
7.
V.N. Burakevich V.A. Lisinetskii A.S. Grabtchikov A.A. Demidovich V.A. Orlovich V.N. Matrosov 《Applied physics. B, Lasers and optics》2007,86(3):511-514
Continuous-wave operation of a diode-pumped Nd:YVO4 laser with self-frequency Raman conversion is demonstrated. The threshold of Raman generation was measured to be 1.3 W of
laser diode power. The maximum output power of Stokes radiation at the wavelength of 1177 nm was up to 50 mW at a laser diode
pump power of 2.3 W, corresponding to the slope efficiency of 5%. The beam quality M2 of the Stokes radiation was about 1.4. The fluctuations of the Stokes power were minimised down to 4%.
PACS 42.55.Ye; 42.60.Pk; 42.65.Dr 相似文献
8.
2 is investigated with a XeCl laser. It is shown that energy conversion to rotational Stokes radiation can be efficiently obtained
by properly choosing the focusing geometry of pump radiation and the pressure of the Raman medium even at moderate pulse energies.
Energy conversion to the first rotational Stokes at 313.8 nm with efficiencies as high as 38% is obtained with a circularly
polarised XeCl pump beam of 10-mJ energy focused in 30 bar of H2. The spectral and optical characteristics of the pump and the rotational Stokes radiation are analysed.
Received: 29 May 1996/Revised version: 7 March 1997 相似文献
9.
橘黄色波段固体激光器在基于荧光探测的生物医学诊断和显示等众多方面有着广泛的实际应用. 报道了利用532 nm的Nd∶YAG倍频激光抽运外置喇曼腔内的硝酸钡晶体,获得高效率的599 nm橘黄色喇曼激光的实验结果.对外置喇曼腔实验装置和运转参量进行了优化,喇曼振荡腔由对二阶斯托克斯光有最优化反射率的腔镜构成,对实验中所得到的二阶斯托克斯喇曼激光脉宽压缩及出现双尖峰的现象进行了分析.当抽运光功率达到4.1 W时,获得二阶斯托克斯喇曼激光功率为710 mW,输出光中心波长为599.38 nm,半峰全宽(FWHM)为1.1 nm,激光器最大光光转换效率为17.5%,斜率效率为24.8%. 相似文献
10.
B. Z. Li C. G. Sun A. F. Zang X. H. Zhang M. Zhao X. Y. Chen J. B. Wang G. B. Chen 《Laser Physics》2011,21(5):891-893
A dual-wavelength continuous-wave (CW) diode end-pumped Nd3+:YAlO3 (Nd:YAP) laser that generates simultaneous laser action at the wavelengths 1064 and 930 nm is demonstrated. A total output
power of 2.15 W (1.57 W at 1064 nm and 0.58 W at 930 nm) for the dual-wavelength was achieved at the incident pump power of
17.8 W with optical conversion efficiency of 12.1%. The M
2 values for 930 and 1064 nm lights were found to be around 1.21 and 1.32, respectively. 相似文献
11.
We report a continuous-wave (CW) coherent green radiation at 532 nm by intracavity frequency doubling generation of 1064 nm
Nd:Gd0.18Y0.82VO4 laser. With incident pump power of 18.2 W, output power of 1.08 W at 532 nm has been obtained using a 5 mm-long KTP crystal.
The optical conversion efficiency was up to 5.9%. At the output power level of 1.08 W, the output stability is better than
5%. The beam quality M2 values were equal to 1.26 and 1.12 in X and Y directions, respectively. 相似文献
12.
H. B. Shen Q. P. Wang Y. X. Zhang Z. J. Liu F. Bai X. X. Chen Z. H. Cong L. Gao W. X. Lan C. Wang Y. G. Zhang Z. G. Wu W. T. Wang 《Applied physics. B, Lasers and optics》2012,109(4):643-648
A high-power diode-side-pumped 1,105?nm Nd:GGG laser and a laser at 552?nm based on intracavity frequency doubling of 1,105?nm laser are demonstrated for the first time. A 26.8-W 1,105?nm laser continuous wave output was achieved under the incident pump power of 170?W. A LiB3O5 crystal is used for second harmonic generation of 1,105?nm laser. When the pump power was 170?W, the average output power at 552?nm of 7.3?W was obtained, corresponding to the optical conversion efficiency of 4.3?%. And the minimum pulse width is 181?ns with the pulse repetition rate of 10?kHz. The M 2 factors are measured to be 19.8 and 17.6 in the horizontal and vertical directions, respectively. 相似文献
13.
《Optics Communications》1986,57(5):360-364
Tunable infrared output has been produced by stimulated Raman scattering of visible dye laser radiation in hydrogen gas using a capillary waveguide to enhance conversion to the third Stokes (S3). With 568 nm pumping an output energy of 2 mJ is observed near 2 μ m, representing a 4% energy conversion efficiency into S3). Higher wavelengths yield much lower energies (0.5 mJ at 3 μ m and 0.02 mJ at 4.55 μ m), reflecting the observed dependence of third Stokes output on the inverse of the fifth power of the generated wavelength. 相似文献
14.
B. Q. Yao L. L. Zheng R. L. Zhou X. M. Duan Y. J. Zhang Y. L. Ju Y. Z. Wang G. J. Zhao Q. Dong 《Laser Physics》2008,18(12):1501-1504
We report on the room-temperature continuous-wave (CW) operation of a Ho:YAlO3 laser that is resonantly end pumped at 1.94 μm by a diode-pumped thulium-doped laser in the same host. Through the use of a 1 at % Ho3+-doped 20-mm-long YAlO3 crystal (b cut), the Ho:YAlO3 laser generated 1 W of linearly polarized (E//c) output at 2118 nm and 0.55 W of E//a output at 2128.5 nm for an incident pump power of 5 W, with an output coupler transmission of 14 and 3%, respectively. An optical-to-optical conversion efficiency of 20% and a slope efficiency of 33% were achieved at 2118 nm corresponding to an incident pump power. 相似文献
15.
We observed tunable UV radiation down to 175 nm by SRS of the output of a frequency-doubled dye laser in H2. The high power output of the 4th anti-Stokes to 5th Stokes line generated by the frequency doubled dye laser and the 8th
anti-Stokes to 3rd Stokes line generated by the undoubled dye laser represents a broadly tunable coherent radiation source
between 189 nm and 2064 nm. 相似文献
16.
We report a continuous-wave (CW) self-frequency-doubling blue laser at 468 nm by a diodepumped Nd3+:YCa4O(BO3)3 (Nd:YCOB) laser. With 14.3 W of diode pump power, a maximum output power of 211 mW in the blue spectral range at 468 nm has
been achieved. The beam quality M2 values were equal to 1.16 and 1.23 in X and Y directions, respectively. The output power stability over 30 min is better than 5%. To the best of our knowledge, this is
the highest power laser at 468 nm generated by self-frequency doubling of a diode pumped Nd:YCOB laser. 相似文献
17.
We present for the first time a dual-wavelength laser operation at 1064 and 914 nm in two NdYVO4 crystals. A 879 nm laser diode is used to pump the first Nd:YVO4 crystal emitting at 914 nm, and the second Nd:YVO4 laser emitting at 1064 nm intracavity pumped at 914 nm. A total output power of 4.28 W at the two fundamental wavelengths
was achieved at the absorbed pump power of 13.8 W. The M2 values for 914 and 1064 nm lights at the maximum output power were found to be around 1.3 and 1.1, respectively. 相似文献
18.
An efficient and compact red laser at 458 nm is generated by intracavity frequency doubling of a continuous wave (CW) laser operation of a diode pumped Nd:LuVO4 laser at 916 nm under the condition of suppression the higher gain transition near 1064 nm. With 30 W diode pump power and a frequency doubling crystal LBO, as high as 9.6 W of CW output power at 458 nm is achieved, corresponding to an optical-to-optical conversion efficiency of 32.0% and the output power stability in 8 hours is better than 2.35%. To the best of our knowledge, this it the highest conversion efficiency of watt-level laser at 458 nm generated by intracavity frequency doubling of a diode pumped Nd:LuVO4 laser at 916 nm. 相似文献
19.
We report the first-order Stokes output (wavelength of 627.6 nm) from C6H12 enhanced by DCM dye fluorescence with high energy conversion efficiency of 47.9%, quantum conversion efficiency of 56.5%. To our knowledge, it is the highest conversion efficiency of stimulated Raman scattering obtained from liquid Raman laser. A 532nm frequency doubled Nd:YAG laser with 8 Hz repetition rate is employed as the pump source, and the enhancement medium is DCM dye solution in ethanol. The conversion efficiencies at various pump energies and various pump repetition rates are measured and analysed. The enhancement mechanism of SRS together with its potential application is discussed. 相似文献
20.
报道了基于半导体激光端面抽运Nd:YAG的4F3/2–4I13/2 跃迁的弱谱线多波长激光输出. 实验对比了透明陶瓷与单晶材料的激光输出特性, 表明透明陶瓷和单晶材料荧光谱强度的略微差异, 导致了多波长输出时相同两个波长之间的激光强度比在两种材料中的差异. 基于两种耦合输出镜片, 激光阈值都在2 W左右. 在13.5 W的抽运功率下, 基于Nd:YAG透明陶瓷获得了输出功率4.05 W、强度比1 :2的1338与1356 nm双波长激光和输出功率3.65 W、强度比13 : 1的1356与1414 nm 双波长激光, 斜率效率分别达33.9% 和31.9%. 相似文献