Abstract Light detection and ranging (LiDAR) using various operational principles has been applied in many fields, e.g., robotics navigation, autonomous vehicles, unmanned aerial flyers, land surveying, etc. The multichannel LiDAR system is of great importance the field driving due to its larger view (FoV). However, number transceivers limits vertical angular resolution systems makes them costly. On other hand, emergence microelectromechanical (MEMS) mirrors may provide a highly promising...

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We have investigated a new scheme for excitation of the 5s, J = 2 metastable level Kr (5s[3/2]J 2) which can be readily extended to other rare gases. In scheme, an ultraviolet (UV) lamp is used create population atoms in 5s[3/2]J 1 gas cell. The excited are then pumped 5p[3/2]J level, using 819 nm light from Ti:sapphire laser, they decay state with branching ratio 77%. made two striking observations: (1) laser power required saturate second step decreases markedly as function cell pressure,...

We have demonstrated the slowing of a rubidium atomic beam by isotropic monochromatic light. The results agree with model calculation, thus allowing its use for designing practical light slower. large hyperfine splittings lead to natural multifrequency slowing, which is also included in our model.

We have measured the position of Zeeman level crossing between (J,M)=(0,0) and (1,1) sublevels 3 $^{3}$P state helium. The result, 15.756 195(22) MHz (NMR frequency in water), is good agreement with earlier, less precise measurements. This value, together our previous measurement (2,2)-(0,0) crossing, used to calculate zero-field fine-structure splitting. find ${E}_{02}$=8772.517(16) J=0 2 states, ${E}_{12}$=658.548(69) J=1 ${E}_{01}$=8113.969(80) 0 states.

We performed an experimental study on the dependence of linewidth electromagetically induced transparency (EIT) temperature medium in a Λ-type configuration using caesium vapour. found that transparent window is narrowed EIT whose two ground levels are composed hyperfine and broadened case when degenerated Zeeman sublevels, as vapour cell increased. The explanation for phenomena given qualitatively.

Analytic expressions have been derived of the alternating current (ac) Zeeman and ac Stark effect in an atomic beam magnetic resonance method using Ramsey separated oscillating fields. An interesting feature which will affect normal pattern is that interference fringe superimposed on dispersion lineshapes or effect. We point out this new character (ac Stark) generally exists all kinds method, for example, optical interferometer frequency standard. important implication that, particularly...

We have measured the position of magnetic field level crossing J=2, M=2, and J=M=0 sublevels 3 $^{3}P$ state helium. Time-resolved level-crossing spectroscopy, coupled with photoionization detection, were used to achieve accuracy 1.5 ppm. The result, quoted in NMR frequency water, is 9695.023(15) kHz, good agreement earlier, less precise measurements.

A new set-up of a small Cs clock has been successfully experimentally tested. The short-term stability (2/spl times/10/sup -12/) and the long-term (3.5/spl -13/ for day sample time) have measured. Only one laser is needed without any frequency shift device. light caused by diffuse was calculated

We propose a scheme for realizing the long-term continuous output of an atom laser. In this cold atoms in several subsidiary Bose-Einstein condensates (BEC) will be coupled one by turn into main BEC which serves coherent atomic beam. discuss process phase unification newly entered with remaining trap. An ideal dynamical equilibrium can established when transition rate uncondensed transforming condensate and decay coupling satisfy some conditions. The method from to time rates all different...

An experimental test of ac Zeeman effect in an optically pumped caesium beam frequency standard is reported and analysed. interference pattern the atomic energy level shift as a function applied microwave field near transition was observed. It superimposed on dispersion lineshape normal effect. This analysed with wavefunction phase analysing method.

We have trapped a cold sample of cesium atoms in magneto-optical trap. The damped harmonic force trap was used to capture and the directly from room temperature vapor. About 1.5 × 107 with density 3 109 atoms/cm3 formed 4 mm3 atomic cloud below 500 μK.

We have made a very compact diode laser system for our optically pumped cesium beam frequency standard experimental setup. With the new developed saturated absorption spectrum setup whole mount with all optical parts is small in /spl Phi/8 cm/spl times/5 cm cylinder. A bi-directional temperature stabilizer doing either cooling or heating has been to stabilize within plusmn/4 mK wide ambient range (10-30/spl deg/C). In addition, an automatic lock device could D/sub 2/ line by simply button...

Based on the realization of magneto-optical trap for cesium atom in China, great improvement is achieved its performance. In new experimental setup, a laser battery stepwise injection-locking scheme developed as source, which has more output power and better beam quality than previous one. Under optimum working condition, atoms 109 with density 1011 atoms/cm3 are trapped to form an atomic cloud diameter 3 mm. Compared results, both number increased two orders magnitude.

In response to the increasingly serious problem of harmonic pollution in power grid, which urgently requires massive data support analysis and governance, this paper proposes an improved SABO optimization algorithm BP neural network achieve prediction alleviate current shortage data. order overcome being prone falling into local optima, a logistic chaotic map is used replace random numbers during initialization, golden sine iterative search assist jumping out thereby improving accuracy...

<title>Abstract</title> LiDAR has become a prominent technology in 3D sensing due to its reliable distance detection. However, the sparse point cloud data it produces, particularly during long-range scanning, poses challenges for processing. To overcome this, we developed novel system with focusing functionality improve density when scanning objects. The system, which comprises MEMS mirror-based and CMOS camera, leverages adjustable light beam steering of mirror dynamically alter laser angle...

Light frequency shift measured in a small optically pumped caesium beam standard is reported and analysed. Two light sources, the diffused laser scattered from tube parts fluorescence atoms excited by light, for are discussed.

A new pumping-probing scheme for the optically pumped cesium beam frequency standard has been experimentally tested in our laboratory. The stability of was measured by comparing its 10 MHz output with an HP5071A commercial atomic clock. result shows that 1 s and 30000 sample times are 1.2×10-11 3.7×10-13, respectively. It proved pumping works well.

We have studied the relationship between temperature of Cs cold atoms and parameters cooling laser. The are first cooled captured by a magneto-optical trap then further optical molasses. is measured time-of-flight method. For relatively large laser intensity small detuning, depends linearly on intensity-to-detuning ratio, nonlinear has also been found in other case.

Based on an improved optical system, which consists of six laser diodes with two injection locking stages and control set-ups the intensity frequency laser, we have achieved first molasses in China. The time-of-flight(TOF) signal cloud Cs atoms has been obtained, analytical formula for measuring temperature atomic from its TOF is given. lowest measured to be 10 μK.

A novel cesium beam frequency standard has been designed. In this design, the probing laser light is set at an angle of 66.46 degrees to atomic beam. configuration, effect noise on signal-to-noise ratio drastically reduced without use any troublesome line-narrowing technique. With respect probe laser, CsD/sub 2/ linewidth Doppler-broadened about 125 MHz, five times wider than commercially available diode lasers. Thus, affects only slightly signal Ramsey resonance signal. Compared...

We report frequency locking of a commercial 657 nm diode laser to high finesse Fabry–Perot cavity by the Pound–Drever–Hall method. The linewidth relative is estimated be about 6 kHz.

A magneto-optical trap (MOT) for cesium atoms that operates without a separate repumping laser is reported. The differences between normal MOT and this kind of have been experimentally studied. influences on cooling trapping in the carefully investigated. results reveal it critical injection-locked state diode makes possible laser.