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1.
分别采用MOTORULA公司的硅基光电二极管探测器和JUDSON公司的InGaAs光电二极管探测器对泵浦光和信号光的脉宽进行了测量.研究了极化周期、工作温度以及抽运功率与周期极化掺镁铌酸锂光学参量振荡器输出的信号光脉冲宽度的作用关系.实验采用LD端面抽运的声光调Q Nd∶YVO4激光器作为抽运源,在晶体温度为30 ℃、极化周期为29.5 μm条件下,当抽运功率为1 008 mW时,获得了平均功率为238 mW的信号光输出,其光-光转换效率为23.6%,最窄脉冲宽度约为9.3 ns,相对抽运光脉宽被明显压窄. 相似文献
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分别采用MOTORULA公司的硅基光电二极管探测器和JUDSON公司的InGaAs光电二极管探测器对泵浦光和信号光的脉宽进行了测量.研究了极化周期、工作温度以及抽运功率与周期极化掺镁铌酸锂光学参量振荡器输出的信号光脉冲宽度的作用关系.实验采用LD端面抽运的声光调QNd:YVO4激光器作为抽运源,在晶体温度为30℃、极化周期为29.5μm条件下,当抽运功率为1008mW时,获得了平均功率为238mW的信号光输出,其光-光转换效率为23.6%,最窄脉冲宽度约为9.3ns,相对抽运光脉宽被明显压窄. 相似文献
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对基于周期极化掺镬铌酸锂晶体的信号光单谐振光学参量振荡器的输出特性进行了实验研究.讨论了光学参量振荡器谐振腔的腔长、周期极化铌酸锂晶体的通光长度、输出镜的透过率以及抽运光的脉冲宽度对光学参量振荡器谐振阈值的影响.光学参量振荡器的抽运源采用输出波长为1 064 nm的声光调Q Nd:YVO_4激光器,在重复频率为2 kHz、周期极化掺镁铌酸锂晶体的温度为30℃的条件下,光学参量振荡器的振荡阈值仅为48 mW.当抽运功率为94 mW时获得了25 mW的信号光输出,其光-光转换效率为26.6%. 相似文献
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对基于周期极化掺镁铌酸锂晶体的信号光单谐振光学参量振荡器的输出特性进行了实验研究.讨论了光学参量振荡器谐振腔的腔长、周期极化铌酸锂晶体的通光长度、输出镜的透过率以及抽运光的脉冲宽度对光学参量振荡器谐振阈值的影响.光学参量振荡器的抽运源采用输出波长为1 064 nm的声光调Q Nd∶YVO4激光器,在重复频率为2 kHz、周期极化掺镁铌酸锂晶体的温度为30 ℃的条件下,光学参量振荡器的振荡阈值仅为48 mW.当抽运功率为94 mW时获得了25 mW的信号光输出,其光-光转换效率为26.6%. 相似文献
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研究了不同畴腐蚀深度的掺镁铌酸锂二维六角可调阵列光分束器的分数Talbot效应.对不同Talbot分数β和不同畴腐蚀深度的阵列光分束器Talbot衍射像进行了数值模拟理论研究.模拟结果表明,Talbot分数β可以改变Talbot衍射像的周期及结构分布,而畴腐蚀深度可有效调制衍射像的光强分布.在理论研究的基础上,设计并制备了具有不同畴腐蚀深度的掺镁铌酸锂二维六角阵列光分束器,对其在不同Talbot分数β条件下的分数Talbot效应进行了通光实验研究,实现了畴腐蚀阵列光分束器对近场Talbot衍射光强分布的调制,实验结果与理论研究结果一致. 相似文献
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利用掺杂浓度为5 mol%的掺氧化镁多周期极化铌酸锂晶体实现了高效单谐振的准相位匹配光参量振荡器,所使用的周期极化铌酸锂晶体有6个周期,且以1 μm为间隔,从26.5~31.5 μm. 该光参量振荡器以脉宽为150 ns,重复频率为10 kHz的声光调Q Nd∶YAG激光器为泵浦源,且泵浦光波长为1.064 μm. 通过控制晶体的温度(50~200℃)以及改变晶体的极化周期(26.5~31.5 μm),可由该光参量振荡器获得2.83~2.89 μm,3.10~3.38 μm,3.57~3.78 μm,3.95~4.12 μm, 4.28~4.46 μm,4.65~4.79 μm的闲频光连续调谐输出. 且当泵浦功率为8.15 W时,在闲频光输出波长为3.33 μm处,获得了最大输出功率2.17 W. 相似文献
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We fabricated and characterized periodically poled MgO:LiNbO3 device with five gratings in 0.5 μm increments from 29 μm to 31 μm for optical parametric oscillator (OPO). The OPO operation threshold is 30 μJ using this device with a 50 mm effective length. At 560 mW input pump power, we have achieved 300 mW of the total output power, and the conversion efficiency is 54%. Multi-periods and temperatures tuning of the OPO yields a signal wavelength range from 1.45 to 1.72 μm and an idler wavelength range from 2.8 to 4.05 μm in the mid infrared. 相似文献
12.
Compact efficient optical parametric generator internal to a Q-switched Nd:YVO4 laser with periodically poled MgO:LiNbO3 下载免费PDF全文
This paper demonstrates a compact efficient optical parametric
generator internal to a Q-switched diode-end-pumped Nd:YVOquasi-phase-matching,
intracavity optical parametric generator, periodically poled
MgO-doped lithium niobate (PPMgLN) Project supported by the National
Natural Science Foundation of China (Grant Nos 10474071 and
60671036). 4265K, 4260F, 4270 This paper demonstrates a compact efficient optical parametric
generator internal to a Q-switched diode-end-pumped Nd:YVOquasi-phase-matching,
intracavity optical parametric generator, periodically poled
MgO-doped lithium niobate (PPMgLN) Project supported by the National
Natural Science Foundation of China (Grant Nos 10474071 and
60671036). 4265K, 4260F, 4270 This paper demonstrates a compact efficient optical parametric
generator internal to a Q-switched diode-end-pumped Nd:YVOquasi-phase-matching,
intracavity optical parametric generator, periodically poled
MgO-doped lithium niobate (PPMgLN) Project supported by the National
Natural Science Foundation of China (Grant Nos 10474071 and
60671036). 4265K, 4260F, 4270 This paper demonstrates a compact efficient optical parametric
generator internal to a Q-switched diode-end-pumped Nd:YVOquasi-phase-matching,
intracavity optical parametric generator, periodically poled
MgO-doped lithium niobate (PPMgLN) Project supported by the National
Natural Science Foundation of China (Grant Nos 10474071 and
60671036). 4265K, 4260F, 4270 This paper demonstrates a compact efficient optical parametric
generator internal to a Q-switched diode-end-pumped Nd:YVOquasi-phase-matching,
intracavity optical parametric generator, periodically poled
MgO-doped lithium niobate (PPMgLN) Project supported by the National
Natural Science Foundation of China (Grant Nos 10474071 and
60671036). 4265K, 4260F, 4270 This paper demonstrates a compact efficient optical parametric
generator internal to a Q-switched diode-end-pumped Nd:YVO$_{4}$
laser with periodically poled MgO:LiNbO3(PPMgLN). With the
Q-switch set at a repetition rate of 25kHz and the PPMgLN crystal
operated at room temperature (25\du\,), the intracavity optical
parametric generator threshold was reached as a diode pump power of
0.9\,W. A maximum signal output power of 0.34W with a pulse width
of 25\,ns and a beam quality factor of 1.4 was obtained at an
incident diode power of 3.4\,W, leading to a conversion efficiency of
10{\%} with a slope efficiency of 14.4{\%}. By varying the crystal
temperature from 25 to 200\du, the output signal wavelengths were
tuned in range of 1506--1565\,nm. Over a 30-minutes interval, the
instability of the signal power was measured to be less than 1{\%}.
In addition, the threshold pump intensity for the intracavity optical
parametric generator is theoretically investigated, and the obtained
result is in good agreement with the experimental results. 相似文献
13.
Widely tunable high power OPO based on a periodically poled MgO doped lithium niobate crystal 总被引:3,自引:0,他引:3
An optical parametric oscillator (OPO) based on a highly MgO doped periodically poled lithium niobate (PPMgLN) crystal was experimentally demonstrated and the result is presented in this report. The PPMgLN wafer was fabricated from a MgO doped (with 6 mol% doping concentration) lithium niobate crystal by means of high voltage pulse trigged domain reversal technique and has 20 domain reversal periods from 27.8 to with a step of between the neighbor periods. An acousto-optic (AO) Q-switched Nd3+:YVO4 laser was used as the pumping laser. A maximum laser output power of 4.8 W has been achieved for the OPO when the pumping power is 10.8 W and it corresponds to an optic-optic conversion efficiency of 44%. By shifting the PPMgLN wafer, the periods of the domain structure on the PPMgLN wafer can be changed, thus enabling a wide spectral tuning range of the laser output from 1.42 to (for the signal light) and from 2.76 to (for the idler light). 相似文献
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We report on the development of a laser source in the mid-infrared spectral region based on difference-frequency generation (DFG) in a periodically poled LiNbO3 (PPLN) crystal. Continuously tunable coherent radiation from 2.75 to 4.78 μm was produced by optical parametric interaction between a diode-pumped monolithic continuous-wave (CW) Nd:YAG laser operating at 1.064 μm and a CW Ti:Sapphire laser tunable from 767 to 871 nm. Temperature-dependent quasi-phase-matched DFG wavelength acceptance bandwidth was studied and characterized. An empiric formula is given to estimate the phase-matched wavelength acceptance bandwidth as a function of the crystal temperature at Λ = 22.5 μm. A large frequency scan of 128 cm−1 (about 78 cm−1 above 1 μW) near 4.2 μm was achieved. The whole absorption spectrum of the P and R branches of the ν3 band of atmospheric carbon dioxide has been recorded with a single phase-matched frequency scan. 相似文献
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Mid-infrared generation based on a periodically poled LiNbO3 optical parametric oscillator 下载免费PDF全文
We report a nanosecond Nd:YVO_4-pumped optical parametric oscillator (OPO) based on periodically poled LiNbO_3 (PPLN). Tuning is achieved in this experiment by varying the temperature and period of the PPLN. The design of double-pass singly resonant oscillator (DSRO) and confocal cavity enables the OPO threshold to be lowered considerably, resulting in a simple, compact, all-solid-state configuration with the mid-infrared idler powers of up to 466mW at 3.41μm. 相似文献
16.
Low-threshold, high-efficiency, high-repetition-rate optical parametric generator based on periodically poled LiNbO3 下载免费PDF全文
We report a high-repetition-rate optical parametric generator (OPG) with a periodically poled lithium niobate (PPLN) crystal pumped by an acousto-optically Q-switched CW-diode-end-pumped Nd:YVO_4 laser. For the maximum 1064nm pump power of 970mW, the maximum conversion efficiency is 32.9% under the conditions of 250℃, 1064nm pulse repetition rate of 22.6kHz and pulse width of 12ns, and the PPLN OPG threshold in the collinear case is less than 23.7μJ. The output power increases with the increase of the crystal temperature. The 1485-1553nm signal wave and 3383-3754nm idler wave are obtained by changing the temperature and the angle of the PPLN crystal. 相似文献
17.
Period and temperature tuning of cascaded opticalparametric oscillator based on periodically poled LiNbO3 下载免费PDF全文
We report the broadly tunable source by a cascaded optical parametric oscillator in the periodically poled LiNbO_3 (PPLN) with domain grating period and temperature tuning. The optical parametric oscillator was pumped by a passive Q-switched Nd:YVO_4 laser. Multi-wavelength outputs from visible to infrared were obtained. The temperature of the PPLN crystal changed within the range of 70-150℃ with different periods of PPLN. The tunable range covered from 433 to 1657nm. 相似文献
18.
Shuyan Diao Jianquan Yao Yi Zheng Youfu Geng Xiaoling Tan Qiang Liu Longhao Xu 《中国光学快报(英文版)》2006,4(9)
A widely and continuously tunable optical parametric generator (OPG) pumped by a 1064-nm acoustooptically Q-switched diode-end-pumped Nd:YAG laser based on MgO-doped periodically poled LiNbO3 crystal with a multigrating structure (29.2-30.4 μm) is reported.A broad continuous signal spectrum of 1513-1700 nm is obtained by changing the crystal grating periods from 29.2 to 30.4μm and by tuning the crystal temperature from 30 to 180 ℃ simultaneously.When the average pump power is 1.82 W with pulse duration of about 70 ns operating at a repetition rate of 10 kHz,the maximum signal output power of the periodically poled MgO-doped lithium niobate (PPMgLN) OPG is about 210 mW corresponding to the idler and total powers of 118.4 and 328.4 mW respectively. 相似文献
19.
Nimish Dixit Rouchin Mahendra O.P. Naraniya A.N. Kaul A.K. Gupta 《Optics & Laser Technology》2010,42(1):18-1394
A high repetition rate mid-infrared singly resonant optical parametric oscillator (OPO) using MgO-doped multi-grating periodically poled LiNbO3 (MgO:PPLN) is demonstrated. A 1064 nm Q-switched Nd:YVO4 laser at 10 kHz repetition rate and pulse width of 17.8 ns was used to pump the OPO. The period of the quasi-phase matched (QPM) grating in the multi-grating MgO:PPLN chip varied from 25.5 to 31.5 μm in steps of 0.5 μm. This corresponds to the generation of a signal beam from 1.37 to 1.64 μm and an idler beam from 3.0 to 4.8 μm, respectively. A maximum signal power of 250 mW and idler power of 140 mW has been obtained with an input pump beam of power 1.92 W, for a grating period of 30.5 μm. A maximum optic-optic conversion efficiency of 20% and 7.4% in the idler has been observed. It has been observed that the output power increases as the period of the grating increases. 相似文献
20.
Surface second-harmonic generation based on periodically poled LiNbO3 nonlinear optical crystal 下载免费PDF全文
We have generated a second-harmonic generation(SHG) of a Q-switched microchip Nd:YAG laser on the surface of a periodically poled LiNbO3(PPLN) nonlinear crystal near the grazing incidence angle.Three individual SHG waves as transmitted homogeneous,inhomogeneous and reflected radiations have been generated and their intensities are measured and characterized within a desirable range of about 10 different incidence angles of the Nd:YAG laser as pump source on the PPLN surface.The basic of surface nonlinear radiation is also investigated and similar results are calculated and extracted from the theory.Comparison between calculated and measured data shows that they are in good agreement with each other. 相似文献