共查询到20条相似文献,搜索用时 31 毫秒
1.
在精密测量领域,HeNe激光器是制造激光干涉仪的首选.但能够产生中频差4—40 MHz的双折射-塞曼双频HeNe激光器的频差是随机的,小到几百kHz,大到十几MHz.为了让频差能够满足制作双频激光干涉仪的要求,曾出现过弹性加力法、钻孔应力调节法等调整和频差赋值的方法.但这些方法在实际应用中都不是很理想.采用激光内雕法赋值频差,通过在激光器的平面输出镜内部雕刻出不同图案,使平面镜内部产生满足要求的相位延迟,达到为频差赋值的目的.激光内雕法有很多优点:不损害激光器,美观;功率损失小,出光强度可接近原始光强度;可反复赋值,频差在0—60 MHz范围内可调整;频差的稳定性好,采用稳频措施后频差的波动范围小于每小时10 kHz. 相似文献
2.
Sin Hyuk Yim Sang-Bum Lee Taeg Yong Kwon Sang Eon Park 《Applied physics. B, Lasers and optics》2014,115(4):491-495
We present a phase coherent laser system with ultra-low phase noise with a frequency difference of 6.9 GHz. The laser system consists of two extended-cavity diode lasers that are optically phase-locked with electrical feedback to the injection current of a slave laser. The bandwidth of the optical phase-locking loop is extended up to 8 MHz. We achieve the residual phase noise of two phase-locked lasers of below ?120 dBrad2/Hz in the offset frequency range of 100 Hz–350 kHz and a flat phase noise of ?127 dBrad2/Hz from 700 Hz to 20 kHz. These results are, to the best of our knowledge, the lowest phase noise level ever reported with two extended-cavity diode lasers. 相似文献
3.
利用光纤飞秒光频梳和外腔可调谐半导体激光器, 建立了一套双频He-Ne激光器频率测量系统. 选用铷钟作为系统的频率基准, 通过将外腔半导体激光锁定至光频梳使得其频率溯源至铷钟, 再利用外腔可调谐半导体激光与双频He-Ne激光器输出的正交偏振激光拍频, 同时测量两路正交偏振激光频率. 将可调谐半导体激光器锁定至光频梳第1894449个梳齿, 其绝对频率为473612190000.0±2.7 kHz, 相对不确定度为5.7×10-12. 对商品双频He-Ne激光器进行频率测量实验, 双频He-Ne激光器水平方向偏振激光频率均值为473612229934 kHz, 竖直方向偏振激光频率均值为473612232111 kHz, 平均时间为1024 s的相对Allan标准差为5.2×10-11, 频差均值为2.177 MHz, 标准偏差为2 kHz. 相似文献
4.
音频段压缩态光场是进行连续变量量子精密测量重要的量子资源.本文利用自制的低噪声连续单频671 nm/1.34μm双波长激光器作为抽运源,抽运基于周期极化磷酸氧钛钾晶体的简并光学参量振荡器,进行了光通信波段1.34μm连续变量音频段真空压缩态光场的实验制备.当简并光学参量振荡器运转于阈值以下参量反放大状态时,抽运光场功率为95 mW,本地振荡光功率为60μW时,在分析频率8—100 k Hz范围内研制出1.34μm真空压缩态光场.在分析频率36 k Hz处,压缩态光场的最大压缩度达5.0 d B;在音频频率8k Hz处,压缩态光场的压缩度达3.0 d B.音频段1.34μm压缩态光场可用于实现基于光纤的量子精密测量. 相似文献
5.
6.
A method of multi-pulse discriminating frequency and high probability average value filtering is presented for offset frequency locking with ns laser pulses. In the experiment, the frequency locking for cavity-dumped CO2 laser with 100 ns pulse width and the repetition rate of 10 kHz was studied. The precision was up to ±2 MHz at the heterodyne frequency 90 MHz. However, it is more than ±10 MHz for the single pulse discriminating frequency. This method can also be applied to laser offset frequency locking for many kinds of short pulse lasers. 相似文献
7.
R.J. Jones W.-Y. Cheng K.W. Holman L. Chen J.L. Hall J. Ye 《Applied physics. B, Lasers and optics》2002,74(6):597-601
The absolute frequency of the length standard at 514.67 nm based on the molecular iodine (127
I
2) transition of the P(13) 43-0 component a3 is measured using a self-referenced femtosecond optical comb. This frequency-based technique improves measurement precision
more than 100 times compared with previous wavelength-based results. Power- and pressure-related frequency shifts have been
carefully studied. The measured absolute frequency is 71.8±1.5 kHz higher than the internationally accepted value of 582490603.37±0.15 MHz,
adopted by the Comité International des Poids et Mesures (CIPM) in 1997.
Received: 7 March 2002 / Published online: 24 April 2002 相似文献
8.
谐振光学环型腔作为光学陀螺的核心敏感单元,其光学调制谱和与之对应的鉴频曲线的特性成为提高光学陀螺系统检测灵敏度的关键。为了研究光学陀螺的调制和鉴频谱线特性,优化陀螺性能,设计并搭建了实验测试系统,光纤环形谐振腔采用分光比为50∶50、直径17 cm的保偏光纤,总长2.2 m。使用直流高压放大器扫描窄线宽激光器(线宽小于1 kHz)的压电转化模块,扫描频率和电压分别选取20 Hz和1 V,使用模拟比例积分电路进行锁频并反馈给激光器的压电转化模块,使激光器的输出频率跟踪谐振腔实时变化。研究分析了光纤环型谐振腔在两种情况下所对应的透射谱和鉴频曲线:第一种情况为调制电压分别为2 V和4 V,对应调制频率从100 kHz到4 MHz变化;第二种情况为当调制频率为900 kHz,调制电压从2 V到10 V变化。通过实验,得到了不同调制参数下光学陀螺谱线的谐振深度、半高全宽、线性带宽、动态范围、品质因数、标度因数以及对应的锁频精度七种物理量的详细变化情况,并进一步得到了静态测试条件下三种陀螺的最佳调制频率及与之所匹配的调制电压。为进一步研究激光调制对光纤环型谐振腔光谱的影响提供指导。 相似文献
9.
高动态范围声光接收机 总被引:1,自引:0,他引:1
介绍了一种高动态范围声光接收机,这种接收机具备实现宽带射频信号幅度,频率和相位的信道比探测能力,该接收机在0.6328μm激光器的工作条件下(1.0mW),声光布拉格盒在50mW射频信号区动下,在140MHz的中心频率上20MHdisplay status 相似文献
10.
B. Burghardt W. Jitschin G. Meisel 《Applied Physics A: Materials Science & Processing》1979,20(2):141-146
Laser beams are rf amplitude modulated to generate side frequencies which are used to tune a cw dye laser with rf accuracy.
In a laser spectroscopic test experiment a precision of ±15kHz has been realized. 相似文献
11.
Precise measurement of the line width of the photoassociation spectra of ultracold molecules by a frequency shifter
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We propose a technique to precisely measure the line width of the photoassociation spectra of the excited cesium molecule by using a frequency shifter to generate two laser beams with a precise frequency difference. A series of photoassociation spectra are recorded with two laser beams induced molecular lines, whose peak separation serves as an accurate frequency ruler to measure the line width of the photoassociation (PA) spectra. The full width half maximum line width was studied as a function of PA laser intensity. The extrapolated value at zero laser intensity is (34.84 ± 0.22) MHz. By analyzing other broadening mechanisms, a value of (32.02 ± 0.70) MHz was deduced. It is shown that this scheme is inexpensive, simple, robust, and is promising for applications in a variety of other atomic species. 相似文献
12.
A stable AO Q-switched Nd:YVO4 laser using diode-end-pumped structure is presented. By optimizing laser crystal, pumping laser and controlling electric parameters to eliminate thermal lens difference, this AO Q-switched laser can reach 1.3 MHz repetition rate and achieve stable pulse in large range from 10 kHz continuously to 1.3 MHz. The important relationship between repetition rate and electric parameters, including pumping current, duty cycle of electric pulse, are also presented. Output average power and pulse width at 1.3 MHz are 4 W and 35 ns, respectively. 相似文献
13.
The room-temperature response of a 10-MHz quadrant avalanche photodiode (APD) is investigated for detection of high frequency oscillations and tip displacements of fabricated microcantilevers. Currently, no quadrant detectors with a response bandwidth in the megahertz range are available, and oscillations on the order of a few microseconds cannot be resolved. A comparison is made between optical and opto-mechanical measurements to characterize this detector by investigating the frequency response and signal-to-noise (SNR) of pulsed laser signals up to 10?MHz and reflected laser signals from freely vibrating microcantilevers up to 1.64?MHz. The power level of the minimum detectable signal incident on the APD is found to be 28.2?±?5.0?nW for optical measurements and 1.0???W?±?5.0?nW for opto-mechanical measurements. 相似文献
14.
15.
EH Bernhardi MR Khan CG Roeloffzen HA van Wolferen K Wörhoff RM de Ridder M Pollnau 《Optics letters》2012,37(2):181-183
We report the fabrication and characterization of a dual-wavelength distributed-feedback channel waveguide laser in ytterbium-doped aluminum oxide. Operation of the device is based on the optical resonances that are induced by two local phase shifts in the distributed-feedback structure. A stable microwave signal at ~15 GHz with a -3?dB width of 9 kHz was subsequently created via the heterodyne photodetection of the two laser wavelengths. The long-term frequency stability of the microwave signal produced by the free-running laser is better than ±2.5 MHz, while the power of the microwave signal is stable within ±0.35 dB. 相似文献
16.
Spectral filtering of dual lasers with a high-finesse length-tunable cavity for rubidium atom Rydberg excitation
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《中国物理 B》2021,30(7):74203-074203
We propose and demonstrate an alternative method for spectral filtering and frequency stabilization of both 780-nm and 960-nm lasers using a high-finesse length-tunable cavity(HFLTC). Firstly, the length of HFLTC is stabilized to a commercial frequency reference. Then, the two lasers are locked to this HFLTC using the Pound–Drever–Hall(PDH) method which can narrow the linewidths and stabilize the frequencies of both lasers simultaneously. Finally, the transmitted lasers of HFLTC with each power up to about 100 μW, which act as seed lasers, are amplified using the injection locking method for single-atom Rydberg excitation. The linewidths of obtained lasers are narrowed to be less than 1 k Hz, meanwhile the obtained lasers' phase noise around 750 k Hz are suppressed about 30 d B. With the spectrally filtered lasers, we demonstrate a Rabi oscillation between the ground state and Rydberg state of single-atoms in an optical trap tweezer with a decay time of(67 ± 37) μs, which is almost not affected by laser phase noise. We found that the maximum short-term laser frequency fluctuation of a single excitation lasers is at ~ 3.3 k Hz and the maximum long-term laser frequency drift of a single laser is ~ 46 k Hz during one month. Our work develops a stable and repeatable method to provide multiple laser sources of ultra-low phase noise, narrow linewidth, and excellent frequency stability, which is essential for high precision atomic experiments, such as neutral atom quantum computing, quantum simulation, quantum metrology, and so on. 相似文献
17.
18.
L. Cabaret 《Applied physics. B, Lasers and optics》2009,94(1):71-79
An efficient pumping scheme for a quasi-continuous-wave diode-pumped Yb:YAG laser is presented. Single-mode operation and
fine wavelength tuning are assured by the use of a rubidium titanyl phosphate (RTP) Fabry–Perot étalon. When frequency doubled,
the 200–420 μs duration pulses reach a peak power of 70 W at a wavelength of 515 nm. The TEM00 beam is nearly diffraction limited with an M
2 factor of 1.06 at full power. The tuning range spans from 512 to 520 nm and the pulse to pulse frequency stability is on
the order of ±10 MHz.
Laboratoire Aimé Cotton is associated with Université Paris Sud 11. 相似文献
19.
激光扫平自动控制系统 总被引:11,自引:0,他引:11
本文介绍了一种用于农田水利的激光扫平自动控制系统。该系统由激光发射头、万向传感器及控制箱三部分组成。激光发射头采用He-Ne激光器、功率2mW,准直光束直径小于14mm,扫描转速0~500r/min,万向传感器分6层,由54个高灵敏激光探测器组成,工作半径150m,粗平精度±40mm,精平精度±10mm;以激光扫描平面为参照面,控制箱控制液压系统,使推土机或拖拉机的平铲升高或降低,从而实现了自动化平整土地。 相似文献
20.
U.D. Rapol A. Krishna V. Natarajan 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2003,23(2):185-188
We demonstrate a technique to measure hyperfine structure using a frequency-stabilized diode laser and an acousto-optic modulator
locked to the frequency difference between two hyperfine peaks. We use this technique to measure hyperfine intervals in the
5
P
3/2
state of 85Rb and obtain a precision of 20 kHz. We extract values for the magnetic-dipole coupling constant A
= 25.038(5) MHz and the electric-quadrupole coupling constant B
= 26.011(22) MHz. These values are a significant improvement over previous results.
Received 6 March 2003 Published online 15 April 2003 相似文献