共查询到16条相似文献,搜索用时 156 毫秒
1.
利用飞秒光频梳、外腔可调谐半导体激光器和法布里-珀罗干涉仪建立了一套压电陶瓷亚纳米级闭环位移控制系统. 将可调谐半导体激光器锁定至光频梳, 通过精确调谐光频梳的重复频率, 实现了半导体激光器在其工作频率范围内的精密调谐. 利用Pound-Drever-Hall锁定技术将带有压电陶瓷的法布里-珀罗腔锁定至半导体激光器, 进而通过频率发生系统控制压电陶瓷产生亚纳米级分辨率的位移. 实验研究发现锁定至光频梳后可调谐半导体激光器1 s的Allan标准偏差为1.68×10-12, 将其在30.9496 GHz范围内进行连续闭环调谐, 可获得压电陶瓷的位移行程约为4.8 μm; 以3.75 Hz的步长扫描光频梳的重复频率, 实现了压电陶瓷的450 pm闭环位移分辨率并测定了压电陶瓷的磁滞特性曲线. 该系统不存在非线性测量误差, 且激光频率及压电陶瓷位移均溯源至铷钟频率源.
关键词:
光频梳
压电陶瓷
法布里-珀罗腔
可调谐半导体激光器 相似文献
2.
提出一种利用光频梳和可调谐半导体激光器提高台阶高度测量准确度的方法. 通过将可调谐激光器锁定至光频梳,可对激光器的输出波长进行精确锁定与测量.基于可调合成波长链原理,利用锁定后的半导体激光器构建了一套台阶高度测量方案,该方案可消除合成波长误差对台阶高度测量不确定度的影响. 采用一台可调谐半导体激光器和光频梳进行了5000 s的连续锁定实验, 结果表明,锁定后的可调谐半导体激光器的频率稳定度达 1.8×10-12.该方法的理论测量不确定度约为7.9 nm, 且测量结果可溯源至时间频率基准. 相似文献
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4.
电光晶体调谐的外腔反馈半导体激光器 总被引:1,自引:0,他引:1
报道一种用电光晶体实现快速调谐和凋制激光频率的方法.在Littrow型外腔反馈半导体激光中插入LiNbO3晶体,利用LiNbO3晶体的电光效应,通过改变晶体电压来调节激光器的有效腔长,可以对激光频率进行快速的调谐和调制.采用该方法,自制外腔反馈半导体激光器的调谐频率可达到2 kHz,它的调谐范围为350 MHz,激光频率调谐系数约为1.06 MHz/V,用饱和吸收光谱观测频率调谐的效果.快速激光频率调制可以应用在稳频技术上,将外腔反馈半导体激光器调制在5~100 kHz频率下,均获得了87Rb原子D2线的饱和吸收光谱的色散信号,并实现了激光频率在饱和吸收峰上的长期稳定. 相似文献
5.
本文介绍采用拍频曲线晶振基准法首次在Uniphase 1007型长寿命商品He-Ne激光管上实现了无压电陶瓷调谐元件的塞曼双频稳频,采用可调永磁供磁,达到光频长期漂移5×10~(-9);双频双线偏振分离度1/60;双线偏振正交度89.5°;入锁及锁定情况良好.给出了塞曼双频激光器的调试技术.描述了输出光束偏振状态和纵模数关系的一个物理现象. 相似文献
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7.
提出一种结合注入锁定技术的主动滤波放大方法,将光梳直接注入锁定至光栅外腔半导体激光器,产生窄线宽激光光源,该光源可以用于锶原子光钟二级冷却.实验中,将中心波长为689 nm,带宽为10 nm的光梳种子光源注入689 nm光栅式外腔半导体激光器,通过半导体增益光谱与半导体光栅外腔,从飞秒光梳的多个纵模梳齿中挑选出一个纵模模式来进行增益放大,再通过模式竞争,实现单纵模连续光输出;同时,光梳的重复频率锁定在线宽为赫兹量级的698 nm超稳激光光源上,因此,注入锁定后输出的窄线宽激光也继承了超稳激光光源的光谱特性.利用得到的输出功率为12 mW的689 nm窄线宽激光光源实现了88Sr原子光钟的二级冷却过程,最终获得温度为3μK,原子数约为5×10~6的冷原子团.该方法可拓展至原子光钟其他光源的获得,从而实现原子光钟的集成化和小型化. 相似文献
8.
研究了一种全新的纳米尺度位移测量系统。将双折射元件插入He-Ne激光器谐振腔内产生频率分裂效应,使原本单模谐振的激光器输出变成了频差可调的2个正交偏振频率(o光和e光),而形成双频激光器。在激光谐振腔外放置沿激光轴线位移的反射表面,将输出的激光束反射回腔内,以便对激光的光强进行调制,可实现高分辨率非接触式可判向位移测量。提出了一种细分方法,该方法突破了传统干涉系统的衍射极限(1/2波长)。对于633nm波长He-Ne激光,本系统的理想分辨率为1/8波长(约为79nm)。 相似文献
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研究了激光二极管抽运的可调频差的双频固体激光器,激光增益介质为2mm厚的1at%掺杂Nd:YAG薄片.对谐振腔产生稳定双频激光的条件作了分析,用琼斯矩阵计算了谐振腔内各处电场矢量的偏振态,证明了双频激光两个电场矢量偏振态之间总是正交的.两个偏振激光频率间隔由改变λ/4波片快轴之间的夹角实现调谐.实验中使用腔内标准具实现单频运转,然后插入双λ/4波片使单纵模激光频率分裂,实现了激光器的双频输出.实验中得到双频激光稳定运转时频差的上限约为1.3GHz;由于强模竞争现象的存在,实验中所观察到的频差下限为50MHz. 100MHz拍频时得到的双频激光输出功率为85mW.
关键词:
激光技术
固体激光器
双频激光 相似文献
11.
A diode laser spectrometer at 634nm and absolute frequency measurements using optical frequency comb
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This paper reports that two identical external-cavity-diode-laser
(ECDL) based spectrometers are constructed at 634 nm referencing on
the hyperfine B-X transition R(80)8-4 of 127I2. The lasers
are stabilized on the Doppler-free absorption signals using the
third-harmonic detection technique. The instability of the
stabilized laser is measured to be 2.8×10-12 (after
1000 s) by counting the beat note between the two lasers. The
absolute optical frequency of the transition is, for the first time,
determined to be 472851936189.5 kHz by using an optical frequency
comb referenced on the microwave caesium atomic clock. The
uncertainty of the measurement is less than 4.9 kHz. 相似文献
12.
Precise determination of characteristic laser frequencies by an Er-doped fiber optical frequency comb
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Shiying Cao 《中国物理 B》2022,31(7):74207-074207
Femtosecond optical frequency combs correlate the microwave and optical frequencies accurately and coherently. Therefore, any optical frequency in visible to near-infrared region can be directly traced to a microwave frequency. As a result, the length unit "meter" is directly related to the time unit "second". This paper validates the capability of the national wavelength standards based on a home-made Er-doped fiber femtosecond optical frequency comb to measure the laser frequencies ranging from visible to near-infrared region. Optical frequency conversion in the femtosecond optical frequency comb is achieved by combining spectral broadening in a highly nonlinear fiber with a single-point frequency-doubling scheme. The signal-to-noise ratio of the beat notes between the femtosecond optical frequency comb and the lasers at 633, 698, 729, 780, 1064, and 1542 nm is better than 30 dB. The frequency instability of the above lasers is evaluated by using a hydrogen clock signal with a instability of better than 1×10-13 at 1-s averaging time. The measurement is further validated by measuring the absolute optical frequency of an iodine-stabilized 532-nm laser and an acetylene-stabilized 1542-nm laser. The results are within the uncertainty range of the international recommended values. Our results demonstrate the accurate optical frequency measurement of lasers at different frequencies using the femtosecond optical frequency comb, which is not only important for the precise and accurate traceability and calibration of the laser frequencies, but also provides technical support for establishing the national wavelength standards based on the femtosecond optical frequency comb. 相似文献
13.
Absolute optical frequency measurement of saturated absorption lines in Rb near 422 nm 总被引:1,自引:0,他引:1
A.D. Shiner A.A. Madej P. Dubé J.E. Bernard 《Applied physics. B, Lasers and optics》2007,89(4):595-601
We present absolute optical frequency measurements of the 5s2
S
1/2–6p2
P
1/2 hyperfine resolved transitions in both 85Rb and 87Rb near 422 nm. The frequency of each transition was measured by stabilizing a narrow-linewidth extended cavity diode laser
to the transition under study and by measuring that frequency with a femtosecond laser frequency comb. A frequency-doubled
844 nm laser was used as a frequency link to connect the 422 nm probe laser to the near infrared part of the comb. The resulting
uncertainties of <70 kHz in the Rb transition frequencies represent a four-order of magnitude improvement over previously
published results. The frequencies reported in this paper are one of the most accurate series of measurements made in the
violet region of the spectrum.
PACS 06.30.Ft; 33.20.Kf; 43.62.Fi 相似文献
14.
K. Döringshoff I. Ernsting R.-H. Rinkleff S. Schiller A. Wicht 《Applied physics. B, Lasers and optics》2008,91(1):49-56
We analyze in detail the frequency noise properties of a grating enhanced external cavity diode laser (GEECDL). This system
merges two diode laser concepts, the grating stabilized diode laser and the diode laser with resonant optical feedback, thus
combining a large tuning range with an excellent short-term frequency stability. We compare the frequency noise spectrum of
a GEECDL to that of a grating stabilized diode laser and demonstrate a 10-fold reduction of the frequency noise linear spectral
density. The GEECDL is phase locked to a similar laser and to a fs-frequency comb with a servo loop providing an open-loop
unity-gain frequency of only 237 kHz, which is a tenth of the bandwidth typically required for grating stabilized diode lasers.
We achieve a residual rms phase error as small as 72 mrad (≈ 200 mrad) for stabilization to a similar laser (to the fs-frequency
comb). We demonstrate that the novel diode laser can phase-coherently track a stable optical reference with an instability
of 1.8×10-16 at 1 s. This laser system is well suited for applications that require phase locking to a low-power optical reference under
noisy conditions. It may also be considered for the implementation of optical clock lasers.
PACS 42.55.Px; 42.60.Jf; 42.50.Gy 相似文献
15.
V. B. Tiwari S. R. Mishra H. S. Rawat S. Singh S. P. Ram S. C. Mehendale 《Pramana》2005,65(3):403-411
We present results of a study of frequency stabilization of a diode laser (λ = 780 nm) using the Doppler-free dichroic lock
(DFDL) technique and its use for laser cooling of atoms. Quantitative measurements of frequency stability were performed and
the Allan variance was found to be 6.9 × 1011 for an averaging time of 10 s. The frequency-stabilized diode laser was used to obtain the trapping beams for a magneto-optic
trap (MOT) for Rb atoms. Using the DFDL technique, the laser frequency could be locked over a wide range and this enabled
measurement of detuning dependence of the number and temperature of cold atoms using a relatively simple experimental set-up. 相似文献
16.
D. Das A. Banerjee S. Barthwal V. Natarajan 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,38(3):545-552
We have developed a ring-cavity resonator that
can be used to measure the absolute frequencies of optical
transitions with an uncertainty below 40 kHz. The length
of the resonator is calibrated against a reference laser
locked to the D2 line of 87Rb, the frequency of
which is known with 6 kHz accuracy. We demonstrate the
power of this technique by measuring the absolute
frequencies of various hyperfine transitions in the D1
line of 133Cs. Our results agree with earlier
measurements using the frequency-comb technique, and have
similar accuracy. Measurement of the D1-line frequency
could lead to a more precise determination of the
fine-structure constant. We also report a precise value of
A=291.918(8) MHz for the hyperfine constant in the
6P1/2 state. 相似文献