共查询到20条相似文献,搜索用时 99 毫秒
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红外激光光源在微量气体、高分辨率光谱分析和量子光学研究等领域具有重要的应用.本文利用锁定单共振光学参量振荡器内腔标准具的方案获得了无跳模连续调谐的红外激光输出,理论和实验研究了红外激光的强度噪声特性,分析了影响强度噪声的因素.通过控制非线性晶体的温度和标准具调制信号实现了对红外激光强度噪声的抑制.当控制非线性晶体工作温度为60℃,内腔标准具调制信号为8 kHz时,单共振光学参量振荡器输出信号光和闲置光的强度噪声分别降低了11和8 dB. 相似文献
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利用非简并光学参量振荡器(NOPO)产生的强度量子关联孪生光束,在实验上实现了波长可调谐的亚泊松光。实验获得最好亚泊松光噪声低于散粒噪声极限2.6dB;在7.4nm的波长调谐范围内,亚泊松光噪声低于散粒噪声2dB。同时,在实验上直接测量了亚泊松光的统计分布。 相似文献
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低频压缩态光场可用于提高引力波探测器灵敏度, 近年来受到人们的广泛关注. 相对于高频段而言, 低频压缩态的产生更容易受到外界环境噪声的干扰而不易被观察到. 本文采用全固化单频倍频Nd: YVO4/KTP激光器作为光源, 利用双波长共振的光学参量振荡器实现参量过程, 以1064 nm波长的红外作为基频光, 激光器腔内倍频产生的532 nm绿光作为抽运光, 通过调节周期性极化磷酸氧钛钾晶体温度使光学参量振荡器达到双波长同时共振, 采用真空注入的方式, 利用Pound-Drever-Hall锁腔技术锁定抽运场. 输出压缩光通过平衡零拍探测, 最终在实验上获得了频率低至3 kHz的真空压缩, 所直接观察到的压缩度为2 dB. 相似文献
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利用全固化单频Nd∶YVO4激光器抽运由periodically poled lithium niobate(PPLN)准相位匹配晶体组成的光学参量振荡器,通过调节晶体的温度,在信号模与闲置模近简并的情况下,完成了抽运场与两个亚谐波模在腔内同时共振,实现了光学参量振荡器的极低阈值运转(阈值为1.2mW);当抽运功率为阈值抽运功率的2.8倍时,观察到反射抽运光的正交位相压缩,压缩度达1.1dB.数值计算与实验结果一致 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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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
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We report a cw optical parametric oscillator (OPO) in a novel architecture comprising two nonlinear crystals in a single cavity, providing two independently tunable pairs of signal and idler wavelengths. Based on a singly resonant oscillator design, the device permits access to arbitrary signal and idler wavelength combinations within the parametric gain bandwidth and reflectivity of the OPO cavity mirrors. Using two identical 30 mm long MgO:sPPLT crystals in a compact four-mirror ring resonator pumped at 532 nm, we generate two pairs of signal and idler wavelengths with arbitrary tuning across 850-1430 nm, and demonstrate a frequency separation in the resonant signal waves down to 0.55 THz. Moreover, near wavelength-matched condition, coherent energy coupling between the resonant signal waves, results in reduced operation threshold and increased output power. A total output power >2.8 W with peak-to-peak power stability of 16% over 2 h is obtained. 相似文献
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针对利用周期极化晶体实现的抽运光角度调谐准相位匹配(QPM)光学参量振荡器(OPO)进行了系统的理论分析,给出了描述QPM OPO中抽运光旋转角与三波波长关系的精确公式和近轴公式.研究发现,对信号光单谐振的情况而言,抽运光与空闲光沿晶体x轴的同侧出射,而对空闲光单谐振而言,抽运光与信号光沿晶体x轴的同侧出射.另外,信号光单谐振下信号光与空闲光间的夹角要大于空闲光单谐振下两者间的夹角.更重要的是,信号光单谐振时的波长调谐速度也较空闲光单谐振时的大.
关键词:
准相位匹配
空闲光单谐振光学参量振荡器
抽运光角度调谐
调谐速度 相似文献
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M.E. Klein M. Scheidt K.-J. Boller R. Wallenstein 《Applied physics. B, Lasers and optics》1998,66(6):727-732
4 (KTP) optical parametric oscillators (OPOs) with pump and idler resonant cavities. With a linear two-mirror cavity the pump
power at threshold was 70 mW. The single-frequency signal and idler output wavelengths were tuned in the range of 1025 to
1040 nm and 1250 to 1380 nm by tuning the dye laser in the range of 565 to 588 nm. With a dual three-mirror cavity the threshold
was 135 mW. Pumped by 500 mW of 578 nm radiation the 1040 nm single-frequency signal wave output power was 84 mW. Power and
frequency stable operation with a spectral bandwidth of less than 9 MHz was obtained by piezo-electrically locking the length
of the pump resonant cavity to the dye laser wavelength. Similar performance was achieved by placing the idler resonant OPO
inside the resonator of the dye laser. With this system power stable and single-frequency operation was achieved with a spectral
bandwidth of less than 11 MHz for the idler wave.
Received: 3 February 1998/Revised version: 9 March 1998 相似文献
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We report on an idler-resonant femtosecond optical parametrical oscillator(OPO)based on BiB3O6(BiBO)crystal,synchronously pumped by a frequency-doubled,mode-locked Yb:KGW laser at 515 nm.The idler wavelengths of OPO can be tuned from 1100 nm to 1540 nm.At a repetition rate of 75.5 MHz,the OPO generates as much as 400 mW of idler power with 3.1 W of pump power,the corresponding pulse duration is 80 fs,which is 1.04 times of Fourier transform-limited(FTL)pulse duration at 1305 nm.In addition,the OPO exhibits excellent beam quality with M2<1.8 at 1150 nm.To the best of our knowledge,this is the first idler-resonant femtosecond OPO pumped by 515 nm. 相似文献
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Measurement of the optical phase relation among subharmonic pulses in a femtosecond optical parametric oscillator 总被引:1,自引:0,他引:1
We observed the phase relation among subharmonic pulses generated by a femtosecond optical parametric oscillator (OPO). The ratio of the optical frequencies of the idler, the signal, and the pump pulses was set to 1:2:3. Under these conditions the wavelengths of the second harmonic of the signal pulse and the sum frequency between the pump and the idler pulses are the same. The beat signal between these two pulses represents the phase relationship among the pump, the signal, and the idler. The beat frequency varied when the cavity length of the OPO was changed. 相似文献
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We report a demonstration of distributed-feedback (DFB) optical parametric oscillation (OPO) by writing photorefractive gratings in periodically poled lithium niobate (PPLN). The photorefractive DFB structures were fabricated by illumination of PPLN with UV light through a photomask and by writing of PPLN with UV-light gated interfering laser beams at 532 nm. Evidence of OPO was observed from the spectral narrowing at the 1438.8- and the 619.3-nm signal wavelengths from 1064- and 532-nm-pumped PPLN crystals with the DFB grating periods phase matched to the 4084.5- and 3774-nm idler wavelengths, respectively. 相似文献
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T. Ikegami S. Slyusarev T. Kurosu Y. Fukuyama S. Ohshima 《Applied physics. B, Lasers and optics》1998,66(6):719-725
4 as a nonlinear crystal and obtained a pump threshold of 7 mW and an output power of 6 mW for a pump power of 40 mW. The OPO
operated in a single longitudinal mode pair of a signal and an idler, over 1 h without mode hopping in the free-running condition.
The signal and the idler wavelengths were tunable by 1 nm by changing the crystal temperature by 20 °C. The continuous tuning
of the beat frequency between the signal and the idler was achieved by temperature tuning (slow control, 80 MHz/K) and E-field
tuning (fast control, 0.75 MHz/V). We demonstrated the feasibility of frequency control by phase locking the beat frequency.
The beat frequency could be successfully phase locked to a signal generated by a synthesizer through the electrooptic effect
of the crystal. The phase locking could be maintained over 1 h.
Received: 27 January 1998/Revised version: 9 March 1998 相似文献
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Gross P Klein ME Ridderbusch H Lee DH Meyn JP Wallenstein R Boller KJ 《Optics letters》2002,27(16):1433-1435
We present a novel technique for tuning an optical parametric oscillator (OPO) through electro-optically induced shape variations of the parametric gain spectrum in quasi-phase-matched lithium niobate (LN). The diode-pumped, triply resonant continuous-wave OPO is based on a 58-mm-long LN crystal that consists of three equally long sections, the outer sections being periodically poled with a 50% duty cycle. The center section is single-domain material and serves as a tunable phase shifter through the electro-optic effect. By application of a voltage of up to 1230 V, the OPO signal and idler wavelengths are tuned over 102 nm from 1560 to 1660 nm, in good agreement with theory. 相似文献