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1.
LiNbO3电光调谐光学参变振荡器 总被引:6,自引:1,他引:5
在光学参变振荡器中 ,角度或温度调谐方式的最大缺陷就是参变光波长变化较慢 ,调谐操作复杂 ;电光调谐方式具有调谐速度快 ,操作简单的优点。利用非线性光学晶体LiNbO3 的电光效应 ,在 1 0 6 4 μmNd∶YAG激光器输出的抽运光作用下 ,切割角θ =4 7.5°,在垂直于 1.0 6 μm抽运光偏振方向上加 - 4 .5 +4.5kV直流电压 ,实现参变光波长调谐输出 ,输出光能量约为 2 6mJ左右 ,转换效率 η≈ 17.3%。实验所得的参变光波长变化与调谐电压的线性关系与理论计算相吻合 ,为实现光学参变振荡器的快速调谐快速输出提供了一种可行的技术途径。 相似文献
2.
We report operation of a tunable optical parametric oscillator that employs a nonlinear-fiber Sagnac interferometer as a parametric amplifier. The amplifier, which consists primarily of dispersion-shifted fiber that has zero dispersion at 1538 nm, is synchronously pumped with 7.7-ps pulses at 1539 nm. The wide bandwidth of the parametric gain permits tuning of the output signal pulses over a 40-nm range centered on the pump wavelength. The Sagnac interferometer decouples the pump wave from the oscillator cavity while a bandpass filter in the cavity transmits only the signal wave, thereby creating a singly resonant parametric oscillator that is phase insensitive. Whereas we demonstrate tuning over almost the entire bandwidth of Er-doped-fiber amplifiers, one could construct a similar device that operates near the 1310-nm zero-dispersion wavelength of standard telecommunication fiber. 相似文献
3.
微微秒自动调谐参量激光的研究 总被引:3,自引:3,他引:0
采用一对MgO:LiNbO_3角度调谐覆盖了红近外波段0.7~2.2μm,并配以自动波长扫描。文中分析了影响脉冲宽度与线宽的因素,与实验结果相吻合。脉宽<30ps,线宽~1nm(简并波长附近~10nm),单脉冲峰功率达MW级,参量光总能量转换效率达5.4%。 相似文献
4.
Xu P Li K Zhao G Zhu SN Du Y Ji SH Zhu YY Ming NB Luo L Li KF Cheah KW 《Optics letters》2004,29(1):95-97
We present what is to our knowledge a new approach to generating tunable blue light by cascaded nonlinear frequency conversion in a single LiTaO3 crystal. Simultaneous quasi-phase matching of an optical parametric generation process and a sum-frequency mixing process is achieved by means of structuring the crystal with a quasi-periodic optical superlattice. The spectral (wavelength tuning and bandwidth) and power characteristics of the blue-light generation are studied with a fixed-wavelength 532-nm picosecond laser and a wavelength-tunable nanosecond optical parametric oscillator (OPO) as the pump sources. By tuning the OPO wavelength, we could tune the blue output over approximately 20 nm. Temperature tuning of the blue output at a fixed pump wavelength of 532 nm was limited to approximately 1.5 nm. A maximum blue power of 15 microW was generated at a pump power of 0.5 mW, corresponding to an efficiency of 3%. 相似文献
5.
Optical parametric processes in isotropic third-order nonlinear media with magneto-optic properties 总被引:1,自引:0,他引:1
Optical parametric interaction in isotropic third-order nonlinear media with magneto-optic properties is investigated. It is shown that new phase-matching conditions with a magneto-optic contribution are possible. In particular, we study four-wave mixing and electric field-induced three-wave parametric processes in the presence of a magnetic field applied along the direction of propagation of the interacting waves. Control of the new phase-matching branches can be achieved by tuning of the magnetic field. 相似文献
6.
报道了基于掺氧化镁准周期极化铌酸锂(MgO:QPLN)的多光参量振荡器电场调谐特性理论与实验研究. 通过对电场调谐能力与极化结构参数间关联性的理论分析, 确定了高正负晶畴比MgO:QPLN电场调谐的可行性, 并模拟得到跨周期参量光输出波长与加载电压的关系曲线. 实验中通过对MgO:QPLN有效的电场加载, 实现了3.84 μm波段参量光的电场调谐, 频谱调谐带宽约6 nm, 调谐速率接近1 nm/kV, 进一步结合温度调谐, 实现了参量光宽谱段高精度的连续调谐. 所获得实验结果与理论模拟结果基本符合, 电场调谐在精度控制、快速响应方面相比于传统温度调谐更具技术优势. 相似文献
7.
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
8.
Widely and continuously tunable optical parametric oscillator based on a cylindrical periodically poled KTiOPO(4) crystal 总被引:2,自引:0,他引:2
Fève JP Pacaud O Boulanger B Ménaert B Hellström J Pasiskevicius V Laurell F 《Optics letters》2001,26(23):1882-1884
We report on what is to our knowledge the first realization of a quasi-phase-matched optical parametric oscillator (OPO) based on a crystal with a cylindrical shape. The main reason for interest in this device is its broad, continuous tuning. In experiments with a 1064-nm pump, the signal tuning range was equal to 525 nm (1515-2040 nm), and the corresponding idler was continuously tuned over 1340 nm (2220-3560 nm). The angular tuning was 26 degrees , with only a minor variation of the OPO threshold over the entire tuning range. 相似文献
9.
An over 300 nm tunable broadband noncollinear optical parametric amplification in visible scale as well as the generation
of blue pump pulses in one BBO crystal are demonstrated. Micro-joule energies are achieved in the signal branch, and the signal
central wavelength can be tuned from 475 to 800 nm. The near-transform-limited sub-50 fs pulse duration is attainable over
the whole tuning range after compression by a pair of prisms. 相似文献
10.
针对光学参量振荡产生太赫兹波转换效率低的缺点, 提出了级联参量振荡产生太赫兹波的新机理以提高转换效率. 以周期极化铌酸锂晶体为例, 对级联参量振荡产生太赫兹波的原理和过程进行了理论研究. 分析了抽运光波长、周期极化铌酸锂晶体极化周期和工作温度对产生一阶、二阶闲频光频率的影响. 推导了三波共线相互作用条件下太赫兹波的增益特性和吸收特性. 计算结果表明, 通过级联参量振荡可以有效提高太赫兹波的转换效率, 并可以得到宽调谐的太赫兹波输出. 基于分析结果, 设计了周期极化铌酸锂晶体级联参量振荡产生高效率、宽调谐、窄线宽、连续太赫兹波的实验.
关键词:
太赫兹波
太赫兹波参量振荡
级联参量振荡 相似文献
11.
Knowledge of the tuning characteristics and generation efficiency of optical parametric fluorescence for a nonlinear crystal is of considerable help in defining the operational requirements of a tunable CW parametric oscillator. Detailed observations of the wave-length and temperature dependence of parametric fluorescence from crystals of barium sodium and lithium niobate are reported that extend for the first time to the infra-red. The merit of this approach is illustrated by comparing the temperature tuning curves of two operating argon pumped barium sodium niobate oscillators to the parametric fluorescence tuning curves of the same crystals.This research was jointly sponsored by the Office of Naval Research and the National Aeronautics and Space Administration. 相似文献
12.
C. Fallnich B. Ruffing Th. Herrmann A. Nebel R. Beigang R. Wallenstein 《Applied physics. B, Lasers and optics》1995,60(5):427-436
We report on a cw mode-locked non-critically phase matched KTP optical parametric oscillator synchronously pumped by a picosecond Ti:Sapphire laser. High average signal output power of up to 950 mW over a large tuning range has been achieved. For this OPO the influence of resonator-length detuning on the output power, pulse duration and spectral bandwidth has been investigated. The measured data are in good agreement with the results of a numerical simulation using a split-step Fourier method which considers the group-velocity mismatch, the group-velocity dispersion and the self-phase modulation. The numerical simulation also describes the measured strong pump depletion and its influence on the OPO output and efficiency. 相似文献
13.
Continuous mode-locked operation of a singly resonant, synchronously pumped optical parametric oscillator (SPOPO) based on CdSe has produced idler output tuned over the range of 9.1-9.7 microm, the longest wavelength generated so far to our knowledge from a SPOPO. Average idler powers as high as approximately 70 mW are generated in the crystal. Tandem pumping with a diffraction-grating-tuned parametric oscillator in periodically poled lithium niobate provides a convenient and agile means of tuning the noncritically phase-matched CdSe device. The absence of any detrimental thermal effects in the CdSe crystal suggests that significant further power scaling should be possible, with idler tuning ranges extendable to cover 8-12 microm. 相似文献
14.
Frequency-agile kilohertz repetition-rate optical parametric oscillator based on periodically poled lithium niobate 总被引:3,自引:0,他引:3
We report kilohertz repetition-rate pulse-to-pulse wavelength tuning from 3.22 to 3.7 mum in a periodically poled lithium niobate (PPLN) optical parametric oscillator (OPO). Rapid tuning over 400 cm(-1) with random wavelength accessibility is achieved by rotation of the pump beam angle by no more than 24 mrad in the PPLN crystal by use of an acousto-optic beam deflector. Over the entire tuning range, a near-transform-limited OPO bandwidth can be obtained by means of injection seeding with a single-frequency 1.5-mum laser diode. The frequency agility, high repetition rate, and narrow bandwidth of this mid-IR PPLN OPO make it well suited as a lidar transmitter source. 相似文献
15.
A noncollinearly phase-matched optical parametric amplifier pumped by a commercial 2 MHz fiber laser is presented and discussed. The pump system allows the direct generation of a seed continuum from a sapphire plate. Clean pulses with up to 860 nJ energy and down to 14 fs pulse length can be obtained over a fundamental tuning range from 620 to 970 nm. Conversion by second- and third-harmonic generation as well as sum frequency mixing results in an extended tuning range down to well below 300 nm. 相似文献
16.
本文采用折射率面来描述光参量振荡过程的物理图象,获得了光参量振荡过程的相位匹配图象和频率调谐的简单的数学表达式,直观简洁地说明了光参量振荡器频率调谐曲线的调谐行为.我们用1.06μm和0.532μm激光泵浦β-BaB2O4(BBO)晶体,获得了角度调谐的BBO光参量振荡器的调谐范围分别为1.7~2.35μm及0.72~2.1μm,最大能量转换效率为15%,还讨论了输出能量与腔长的关系. 相似文献
17.
Baozhen Zhao Xiaoyan Liang Yuxin Leng Cheng Wang Juan Du Zhengquan Zhang Zhizhan Xu 《中国光学快报(英文版)》2005,3(3)
The gain properties of near-collinear degenerated phase-matched optical parametric amplification (OPA) using PPKTP crystal are investigated theoretically. The results indicate that the type-0 phase matching of PPKTP has larger accepted angle and better gain spectrum by tuning crystal temperature or rotating crystal angle. 相似文献
18.
Singly resonant optical parametric oscillator in periodically poled KTiOPO(4) pumped by a Bessel beam 总被引:1,自引:0,他引:1
Pasiskevicius V Karlsson H Tellefsen JA Laurell F Butkus R Piskarskas A Smilgevi Ius V Stabinis A 《Optics letters》2000,25(13):969-971
Conical pumping was used in a periodically poled KTiOPO(4) optical parametric oscillator for singly resonant idler generation in a nearly diffraction-limited axial beam. A single signal-idler pair was generated over the whole tuning range by use of asymmetric reflectivity of the OPO mirrors. Pump depletion of 40% and total conversion efficiency of 27% were obtained. Additional OPO tuning capability was demonstrated by adjustment of the angle of the conical pump beam. 相似文献
19.