2003 Vol. 27 No. 6
2003, 27(6): 497-499.
Abstract：
Based on the principle of probe beam deflection,the ablation thresholds of three copper samples with different roughness are measured in moist and dry environment.The results show that,in the two kinds of environment,the larger the roughness,the lower the ablation threshold.When the roughmore+
2003, 27(6): 500-502,509.
Abstract：
The laser surface hardening for mould-cutting roller of 50 carbon steel is carried out using continuous wave CO2 laser beam.The microstructure observation and hardness distribution testing in the cross-section of the hardened layer are performed.The results indicate that the microstructure of tmore+
2003, 27(6): 503-505.
Abstract：
Welding porosity is the main defect during laser welding.In this paper we briefly analyze the mechanism of engendering pores in powder metal material(PM),and study the influence of welding speed and active gas for welding porosity defect.We find that the pore number will be reduced througmore+
2003, 27(6): 506-509.
Abstract：
How laser pretreatment can improve soybean seedlings' cold acclimation is studied in the view of energy transformation,biomembrane integrality and oxygen free radical injury.The results show that pretreatment of soybean seeds with He-Ne laser enhance not only the seeds' content of ATP but almore+
2003, 27(6): 510-513.
Abstract：
The mechanism of action of excimer laser (ArF:193nm 8ns) on cornea is very important in the ablation refractive surgeries such as laser in situ keratomileusis(LASIK)and photorefractive keratectomy(PRK).In this paper,we analyze photoablation model and photophysical model that describe the more+
2003, 27(6): 514-516,596.
Abstract：
A four-dimension simulation code is developed,which enables us to study the thermal effect of high-power lasers propagating through a beam control system.As illustrated examples,the thermal effects of high-power lasers with initial Gaussian and flat-topped profiles in passage through the bemore+
2003, 27(6): 517-519.
Abstract：
A vector algorithm for designing two dimensions,finite aperture,aperiodic diffractive optical elements based on rigorous electromagnetic computation model the finite-difference time-domain method has been proposed.All aspects relating to the algorithm such as optimization process,themore+
2003, 27(6): 520-522,530.
Abstract：
The equivalent area method and inscribed circle method are put forward based on the ellipse method of arbitrary particles for expressing their sizes,the expressions of their shape-affecter and solution of them are studied upon above methods.We think the inscribed circle method as a good expmore+
2003, 27(6): 523-525.
Abstract：
In this paper,the pump coupling and laser feedback in high power double cladding fiber lasers are analyzed,and some ways that should be taken to enhance the capability are also pointed.Conclusions can be drawn that the best scheme is to use side-pump with tapered fiber bundle and fiber gratinmore+
2003, 27(6): 526-530.
Abstract：
The spontaneous parametric down-conversion (SPDC) light field is generated by the combined action of a monochromatic flux of pumping photons and quantum vacuum noise on a nonlinear crystal with no center of symmetry.Its intrinsical quantum origin determines its important role in the area omore+
2003, 27(6): 531-533,537.
Abstract：
Studies have been made on the influences of the second order derivatives of the amplitude and phase of the reflection coefficient on the Gaussian pulse upon reflection from the dielectric mirrors.Results show that the amplitude characteristics of the reflection may also be used to compress the pumore+
2003, 27(6): 534-537.
Abstract：
Under stable-cavity-condition,expression of thermal focal length is educed in the view of cavity.Thermal focal length of Nd:YVO4 crystal is measured,and the result is obtained in experiment.We calculate it in its traditional formula too.At last the two results is compared,and we make a concmore+
2003, 27(6): 538-540,562.
Abstract：
Analyses of the mechanisms of acetic acid emitting fluorescence and fluorescence quenching have been made in theory.The results indicate that acetic acid solutions can emit visible fluorescence when induced by 253.7nm UV light,and fluorescence quenching occurs along with the alteration of smore+
2003, 27(6): 541-543,576.
Abstract：
Numerical simulation has been carried out to study the evolution of perturbed laser beam after passing through a piece of nonlinear medium.The variation of "hot image"with incident beam energy,modulation depth and modulation width have been studied.It has been concluded that:in some conmore+
2003, 27(6): 544-546,550.
Abstract：
The effects of He-Ne laser on vigor of α-amylase,GPT,GOT and content of soluble protein and soluble sacchrides of isatis indigotica have been studied.The results indicate:four treatments have improved the vigor of α-amylase,GPT and GOT.Moreover,7min treatment is the best for α-amylase,amore+
2003, 27(6): 547-550.
Abstract：
In this paper,two rapidly tuning techniques which include a six surface mirrors scanning a fixed grating and a high frequency stepping motor controlling a diffraction grating are presented.It is illustrated in experiments that the means of stepping motor is better than that of rotating mirror.Lasmore+
2003, 27(6): 551-553,566.
Abstract：
Recent advances of diode-pumped thin disc-laser are reviewed.The power-scalable experiment schemes and related results are analyzed.Some problems for practical applications are discussed too.
2003, 27(6): 554-556.
Abstract：
In order to research into the optical damage in iron-doped lithium niobate crystals,we investigated the decay behavior of the optical damage in iron-doped lithium niobate crystals.The dark decay time of the optical damage in thin crystal sheets was found to far exceed that in the thick crystal shmore+
2003, 27(6): 557-559.
Abstract：
A new laser ultrasonic sensor for testing samples' thickness is developed.The detection principle is discussed in detail.This sensor has high-frequency response,high sensitivity and is easy to adjust.The sensor is used to detect laser-induced ultrasonic longitude-wave at the epicenter of the remore+
2003, 27(6): 560-562.
Abstract：
In this paper,the splitting angle and the light intensity splitting ratio of o ray and e ray changing with incident angle are analyzed after non-polarized light penetrates the OE double escape prism.The result proves that the splitting angle changes 2α when the incident angle changes α.At the same timmore+
2003, 27(6): 563-566.
Abstract：
In this paper,a new dynamic and high speed laser drilling system equipped on product line is presented,which is especially fit for thin material's drilling.Moreover some related key technology such as dynamic track,method of distinguishing direction and distortion correction for dual galvanometmore+
2003, 27(6): 567-568,571.
Abstract：
The architecture and function for the archibald firing training system are introduced in this paper.The circuit design and principle of laser transmitter and receiver are described in detail.Simulation training in all weather for the archibald firing is implemented.In addition,functions of naturamore+
2003, 27(6): 569-571.
Abstract：
This paper introduces a high precision high-voltage feedback control circuit.The transmitting circuit turns the real-time voltage into serial digital signals to modulate the light of the semiconductor laser.After passing the high-voltage insulating barrier,the light is received by receiving circuit.Throumore+
Discussion on direct manufacturing metallic pattern for sand mold based on laser cladding technology
2003, 27(6): 572-576.
Abstract：
This paper discusses laser direct manufacturing metallic patterns for sand mould based on laser cladding technology.The fundamental principle and characteristics of this rapid manufacturing (RM) technology are introduced.According to analysis of the structure and working condition of metallicmore+
2003, 27(6): 577-579.
Abstract：
The interaction of solitons and Gaussian quasi-solitons in propagation is studied by solving the NLS equation.The results of the propagation depend on not only the types of soliton but also the transmitting ways.In a special way of propagation the problem of signal interaction can be solved.
2003, 27(6): 580-583,587.
Abstract：
Based on the laser beam classification in accordance with the spatial symmetry and spatial coherence,the parametric characterization of laser beams is studied.The anisotropic twisted Gaussion-Schell model (ATGSM) beam,isotropic twisted Gaussian-Schell model (ITGSM) beam,anisotropic Gaumore+
2003, 27(6): 584-587.
Abstract：
An algorithm for laser stripe matching based on the epipolar constraint is presented.First,the left and right image are taken by CCD camera,then the two images are pre-processed.After being processed the two images that are taken at different angle of view are two pieces of laser stripe of singlmore+
2003, 27(6): 588-590.
Abstract：
Power is a basic parameter of the laser.Its' stabilization and accuracy will directly influence laser process and many other fields.The power detection and control system for high power CO2 laser samples the laser power by the transmission light of the high reflective mirror.Furthermore,it cmore+
2003, 27(6): 591-593.
Abstract：
The effect on neural functional recovery irradiated by magnetized low intensity semiconductor laser is studied.The rabbits were divided into 3week,6week,9week,12week groups according to the observation period.The magnetized laser irradiated group,the laser irradiated group and the conmore+
2003, 27(6): 594-596.
Abstract：
The position sensitive detector(PSD) is an photo-electronic sensor which can detect the continuous position of a light spot traveling over its surface,and convert the position of light spot to simple electric current signal.Based upon PSD,many types of precision and contactless motion detectiomore+
2003, 27(6): 597-599.
Abstract：
Phenomenon of transmitted light intensity's perturbance of the Glan-Taylor prism with varying rotation angle is found in the experiment.It has notable influence on quality of the outgoing polarized light.Causes for the disturbance are analysed.Several parameters that affect the smoothness levmore+
2003, 27(6): 600-602.
Abstract：
The reflective characteristics of the diffused targets are analyzed in the applied fields of the laser technology.The "cat's eye" effect of optical lens,being focused in recent years,is discussed in detail.Test results are given and its applications are introduced briefly.
2003, 27(6): 603-605.
Abstract：
Range gating is a kind of effective method which can eliminate backscattered light and increase the SNR of the laser range gated (LRG) imaging system.The theory of range gating is described,and the key techniques for range gating are analyzed briefly.Then the shortcomings of the traditional rmore+
2003, 27(6): 606-608.
Abstract：
The experiment is conducted by using an Er3+/Yb3+ co-doped double clad fiber with 2m long fiber and input power of 1W.The output power of 242mW with wavelength of 1563.596nm are obtained.
