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RSS1997 Vol. 21, No. 3
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1997, 21(3): 129-131.
[Abstract]
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Abstract:
It is very important for a solid laser system to have a well operating water cooling system.In our system,a inner water cooling system directly contact with solid laser rod and pumped lamp takes the heat into a heat exchanged cell to exchange the heat to outer water cooling system.The inner cooling system has the pure deionized water to increase the life time of the laser and the outer cooling system uses the ordinary water to take the heat out.The system now well operates in our lab.
It is very important for a solid laser system to have a well operating water cooling system.In our system,a inner water cooling system directly contact with solid laser rod and pumped lamp takes the heat into a heat exchanged cell to exchange the heat to outer water cooling system.The inner cooling system has the pure deionized water to increase the life time of the laser and the outer cooling system uses the ordinary water to take the heat out.The system now well operates in our lab.
1997, 21(3): 132-137.
Abstract:
In this paper,we present a novel,low noise and large dynamic range signal detection system for a four frequency differential laser gyroscope.Introducing the mathematical mechanization,we employ decomposition method,which is a theoretical method to solve nonlinear dynamical system,to analyze the model of our system and give the experimental results to verify the theoretical analyzation.According to the decomposition method,the analytical solutions of phase difference,frequency difference and variation rate of frequency difference,which correctly express the parameters of system response time and stable state procedure of the closed phase loop,can be obtained.Based on the theoretical analysis,the signal detection system has been developed.The experimental results show that the system has the ability of large dynamic range and rejecting of noise and meet the requirement of laser gyroscope.
In this paper,we present a novel,low noise and large dynamic range signal detection system for a four frequency differential laser gyroscope.Introducing the mathematical mechanization,we employ decomposition method,which is a theoretical method to solve nonlinear dynamical system,to analyze the model of our system and give the experimental results to verify the theoretical analyzation.According to the decomposition method,the analytical solutions of phase difference,frequency difference and variation rate of frequency difference,which correctly express the parameters of system response time and stable state procedure of the closed phase loop,can be obtained.Based on the theoretical analysis,the signal detection system has been developed.The experimental results show that the system has the ability of large dynamic range and rejecting of noise and meet the requirement of laser gyroscope.
1997, 21(3): 138-140.
Abstract:
While the erbium doped fiber is pumped by a laser diode operating at 806nm,the visible fluorescence at 460nm and 546nm wavelength are observed and measured. This paper give out the spectrum distribution curve of the fluorescence and the relation of the intensity of the visible fluorescence to pumping power.The system is compact and can be used as a low coherence light source of the fiber gyroscope or white light interferometer.
While the erbium doped fiber is pumped by a laser diode operating at 806nm,the visible fluorescence at 460nm and 546nm wavelength are observed and measured. This paper give out the spectrum distribution curve of the fluorescence and the relation of the intensity of the visible fluorescence to pumping power.The system is compact and can be used as a low coherence light source of the fiber gyroscope or white light interferometer.
1997, 21(3): 140-142.
Abstract:
Aviation sylphone is a high precise element and widely employed in air,oil,chemistry and coal industry.Based on grating diffraction principle,we developed a microcomputer automatic measurement system for checking the displacement of aviation sylphone.The system utilizes a He Ne laser with 8mW power output as the light source to provide the 0.53μm resolution and ±0.8μm measurement accuracy.
Aviation sylphone is a high precise element and widely employed in air,oil,chemistry and coal industry.Based on grating diffraction principle,we developed a microcomputer automatic measurement system for checking the displacement of aviation sylphone.The system utilizes a He Ne laser with 8mW power output as the light source to provide the 0.53μm resolution and ±0.8μm measurement accuracy.
1997, 21(3): 143-146.
Abstract:
Laser resisting holographic protective film has been developed.In this paper,the testing on protective effect of laser resisting holographic protective film against powerful laser irradiation has been reported.The testing results show that:for the protection film,the average optical density of 0.53μm wavelength laser is 4.11,the effective protective angle is 15°,with strong power against laser destruction,within 60mJ entrance energy, the protective effects for rabbit eyes are notable with a ratio of 0percent rabbit eye's harm.
Laser resisting holographic protective film has been developed.In this paper,the testing on protective effect of laser resisting holographic protective film against powerful laser irradiation has been reported.The testing results show that:for the protection film,the average optical density of 0.53μm wavelength laser is 4.11,the effective protective angle is 15°,with strong power against laser destruction,within 60mJ entrance energy, the protective effects for rabbit eyes are notable with a ratio of 0percent rabbit eye's harm.
1997, 21(3): 146-148.
Abstract:
This paper is a experimental research on saturated effect of CCD sensor illuminated by a solid YAG laser operating at 1064nm or 530nm.This paper described the experimental setup and the phenomena observed,and the experimental results show that the saturation sensitivity is related to the response sensitivity of CCD sensor at different wavelength.
This paper is a experimental research on saturated effect of CCD sensor illuminated by a solid YAG laser operating at 1064nm or 530nm.This paper described the experimental setup and the phenomena observed,and the experimental results show that the saturation sensitivity is related to the response sensitivity of CCD sensor at different wavelength.
1997, 21(3): 149-151.
Abstract:
Usually,the discharging procedure will product the outcomes at the negative electrode of CO2 laser.This article examined that these outcomes are C28H22,C30 and C37H74 etc.,by mass spectral analysis.The conclusion will be useful to increasing the life time of CO2 laser.
Usually,the discharging procedure will product the outcomes at the negative electrode of CO2 laser.This article examined that these outcomes are C28H22,C30 and C37H74 etc.,by mass spectral analysis.The conclusion will be useful to increasing the life time of CO2 laser.
1997, 21(3): 151-155.
Abstract:
We present the experimental results on the laser back scattering characteristics,such as laser radar cross section,of very rough surface of steel and coated surface at λ=633nm and λ=904nm with a laser scattering automatic measurement system.Based on scattering theory of rough surface,we built up the double ruler model of the rough surface,and utilize phase method and scalar approximate method of Killhoff theory to theoretically calculate the angle distribution of laser back scattering intensity for a specimen of rough surface,at λ=904nm.The experimental results are well agreement with theoretical calculation.
We present the experimental results on the laser back scattering characteristics,such as laser radar cross section,of very rough surface of steel and coated surface at λ=633nm and λ=904nm with a laser scattering automatic measurement system.Based on scattering theory of rough surface,we built up the double ruler model of the rough surface,and utilize phase method and scalar approximate method of Killhoff theory to theoretically calculate the angle distribution of laser back scattering intensity for a specimen of rough surface,at λ=904nm.The experimental results are well agreement with theoretical calculation.
1997, 21(3): 156-159.
Abstract:
The propertics of the off axis line focus optical system for X-ray laser experimental research has been studied theoretically and experimentally in detail.The system has been successfully used in "Xing GuangⅡ" laser facility for X-ray laser experiments and good results have been obtained.
The propertics of the off axis line focus optical system for X-ray laser experimental research has been studied theoretically and experimentally in detail.The system has been successfully used in "Xing GuangⅡ" laser facility for X-ray laser experiments and good results have been obtained.
1997, 21(3): 160-163.
Abstract:
Raman spectrum of CCl4 is enhanced by factor of 102～103 by means of hollow core quartz optical fiber fills up with the CCl4 solution.The experimental results show that the concentration of the solution effects not only the intensity(scattering factor) of some Raman spectrum lines,but also the numerical aperture of the liquidcore fiber.There is a optimal concentration at which the maximum Raman spectrum can be obtain.
Raman spectrum of CCl4 is enhanced by factor of 102～103 by means of hollow core quartz optical fiber fills up with the CCl4 solution.The experimental results show that the concentration of the solution effects not only the intensity(scattering factor) of some Raman spectrum lines,but also the numerical aperture of the liquidcore fiber.There is a optimal concentration at which the maximum Raman spectrum can be obtain.
1997, 21(3): 164-166.
Abstract:
We take the laser beam energy as a line heat source to analyze the temperature field distribution T={(p/hν)/[2(πεcρt)1/2]}exp[-y2/(4αt)] of the deep penetration laser welding,and emphasized the relation Bh=√2(πe)(1/cρTm)(p/v) of the welding speed v,and the depth B and width h of the welded seam.The experimental results show that the theoretical analysis are well agreement with practical operation.
We take the laser beam energy as a line heat source to analyze the temperature field distribution T={(p/hν)/[2(πεcρt)1/2]}exp[-y2/(4αt)] of the deep penetration laser welding,and emphasized the relation Bh=√2(πe)(1/cρTm)(p/v) of the welding speed v,and the depth B and width h of the welded seam.The experimental results show that the theoretical analysis are well agreement with practical operation.
1997, 21(3): 167-170.
Abstract:
This paper presents LCT(Laser Computed Tomography) measurement system of diesel spray,which includes a pulse ruby laser as the light source,a CCD video camera as the detector and the P540 digital image processing system as image storage device.Using the characteristics of ruby laser and CCD video camera,the fuel spray images were grabbed by the digital image processing system in real time.ART was used to reconstruct the fuel spray images and the three dimentional visualization of internal structure of fuel spray was realized.
This paper presents LCT(Laser Computed Tomography) measurement system of diesel spray,which includes a pulse ruby laser as the light source,a CCD video camera as the detector and the P540 digital image processing system as image storage device.Using the characteristics of ruby laser and CCD video camera,the fuel spray images were grabbed by the digital image processing system in real time.ART was used to reconstruct the fuel spray images and the three dimentional visualization of internal structure of fuel spray was realized.
1997, 21(3): 171-173.
Abstract:
This paper presents a method of traceology that uses the principle of double exposure holographic interferometry to investigate the displacement recovery traces on viscoelastic materials.A special concern was put into research of recording the traces of human shoes on surfaces of PVC floors.
This paper presents a method of traceology that uses the principle of double exposure holographic interferometry to investigate the displacement recovery traces on viscoelastic materials.A special concern was put into research of recording the traces of human shoes on surfaces of PVC floors.
1997, 21(3): 174-178.
Abstract:
Functional gradient material (FGM) is a new of boundary continuous composite material.In this paper,research shows that the laser spot heating play a very important role in fabricating Al2O3 Ti functional gradient material.In our experiments,we utilize the thermal couples,which were installed in specimens,to successfully measure the gradient distribution of heating temperature for laser spot heating and analyze the action of laser spot heating in the course of fabricating FGM. At the same time,Al2O3 Ti FGM,11mm in diameter and 3mm thick,has been fabricated.
Functional gradient material (FGM) is a new of boundary continuous composite material.In this paper,research shows that the laser spot heating play a very important role in fabricating Al2O3 Ti functional gradient material.In our experiments,we utilize the thermal couples,which were installed in specimens,to successfully measure the gradient distribution of heating temperature for laser spot heating and analyze the action of laser spot heating in the course of fabricating FGM. At the same time,Al2O3 Ti FGM,11mm in diameter and 3mm thick,has been fabricated.
1997, 21(3): 178-181.
Abstract:
The resistance trimming often use a CO2 laser or Nd:YAG laser as a light source.And the Ar+ laser has shorter wavelength than Nd:YAG and CO2 laser.The reflection index of melt film is smaller for 514.5nm wavelength and it is easy to build a better optical system to provide precise resistance trimming.This paper described the trimming system and summarized much practical data.
The resistance trimming often use a CO2 laser or Nd:YAG laser as a light source.And the Ar+ laser has shorter wavelength than Nd:YAG and CO2 laser.The reflection index of melt film is smaller for 514.5nm wavelength and it is easy to build a better optical system to provide precise resistance trimming.This paper described the trimming system and summarized much practical data.
1997, 21(3): 182-184.
Abstract:
The divergence provided by the semiconductor laser are all defined at the point of half power.In practical calculation, it must be transformed to another define level and the measurement divergence of LOC laser is rather great.So the transformation formulas of divergence for a Gaussian beam are modified in this paper.According to the modification,the formulas of diffraction losses of the laser simulators are derived.As the examples,the diffraction losses of three types of laser simulators are calculated.
The divergence provided by the semiconductor laser are all defined at the point of half power.In practical calculation, it must be transformed to another define level and the measurement divergence of LOC laser is rather great.So the transformation formulas of divergence for a Gaussian beam are modified in this paper.According to the modification,the formulas of diffraction losses of the laser simulators are derived.As the examples,the diffraction losses of three types of laser simulators are calculated.
1997, 21(3): 185-188.
Abstract:
The calculating model of pumping energy distribution in a solid laser medium side pumped by semiconductor laser diode is made in this paper.The absorption and distribution of the pumping energy is analog calculated and the result of the calculation agrees with the result of some experiment very much.After analyze the result of the calculation we get the general rule that how the parameters(size of the medium,absorption coefficient of the medium and distance between the laser diode and the medium)affect the homogeneity of pumping energy distribution in the medium.The advantage and disadvantage of the rod medium and slab medium side pumped by laser diode are analyzed too.
The calculating model of pumping energy distribution in a solid laser medium side pumped by semiconductor laser diode is made in this paper.The absorption and distribution of the pumping energy is analog calculated and the result of the calculation agrees with the result of some experiment very much.After analyze the result of the calculation we get the general rule that how the parameters(size of the medium,absorption coefficient of the medium and distance between the laser diode and the medium)affect the homogeneity of pumping energy distribution in the medium.The advantage and disadvantage of the rod medium and slab medium side pumped by laser diode are analyzed too.
1997, 21(3): 189-192.
Abstract:
In view of the problem that the count quantization error affects on the precision of time interval measurement in pulse laser range finding,a method to improve the precision using A/D is put forward and its feasibility and precision is analyzed in this paper.It is proved through theory analysis and test that this method can be easily realized to decrease the count quantization error by several order.
In view of the problem that the count quantization error affects on the precision of time interval measurement in pulse laser range finding,a method to improve the precision using A/D is put forward and its feasibility and precision is analyzed in this paper.It is proved through theory analysis and test that this method can be easily realized to decrease the count quantization error by several order.
