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RSS1997 Vol. 21, No. 5
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1997, 21(5): 257-262.
[Abstract]
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Abstract:
The laser filler welding is a important and wide applied technology.This paper summarizes the classification and characteristics of laser filler welding,illustrates the advantages,present situation and the problems of laser wire filler welding.
The laser filler welding is a important and wide applied technology.This paper summarizes the classification and characteristics of laser filler welding,illustrates the advantages,present situation and the problems of laser wire filler welding.
1997, 21(5): 262-265.
Abstract:
The paper puts forward the idea about "C1 discrimination" and "thermally induced principal optical axis" for thermal lasing effect in tube lasing medium.The parameter C1 is a factor of the second term of the temperature distribution expression in the cross section of the tube lasing medium.The positive or negative value of C1 indicates the direction of the gradient between the inner wall and outer wall,relatively indicates the operating mode of the laser.In the effect of thermal lensing,basically the temperature gradient determines the distribution of refractive index in the radial direction.So it is called "thermally induced principal optical axis".This paper derives two dimension transfer matrix of ray and the focus length of the thermal lens,meanwhile points out the main method of improving beam quality.
The paper puts forward the idea about "C1 discrimination" and "thermally induced principal optical axis" for thermal lasing effect in tube lasing medium.The parameter C1 is a factor of the second term of the temperature distribution expression in the cross section of the tube lasing medium.The positive or negative value of C1 indicates the direction of the gradient between the inner wall and outer wall,relatively indicates the operating mode of the laser.In the effect of thermal lensing,basically the temperature gradient determines the distribution of refractive index in the radial direction.So it is called "thermally induced principal optical axis".This paper derives two dimension transfer matrix of ray and the focus length of the thermal lens,meanwhile points out the main method of improving beam quality.
1997, 21(5): 266-271.
Abstract:
The status of high-peak power,repetition rate pulsed solid-state lasers are reviewed.The short pulse solid-state laser technology(such as Q-switch,cavity-dumping,mode-looking) and the pulse amplification are evaluated.The development of high-peak power,repetition rate pulsed solid-state lasers will be highlighted in future.
The status of high-peak power,repetition rate pulsed solid-state lasers are reviewed.The short pulse solid-state laser technology(such as Q-switch,cavity-dumping,mode-looking) and the pulse amplification are evaluated.The development of high-peak power,repetition rate pulsed solid-state lasers will be highlighted in future.
1997, 21(5): 272-276.
Abstract:
The optical phase conjugation and photoisomerization of some films of two kinds of polyesters functionalizied by 4-bis(N,N hydroxyethylene)-imino-4-nitroazobenzene have been studied.The photoresponsive mechanism of these films was explained quite well by a model of four-level energy system,which was consisting of two pairs of siglet states of trans and cis isomers,respectively.Photoismerization was the main intramolecular relaxtion between both two-level energy systems.Investigation on effects of pump intensities,polyester structures and thicknees of films has been also carried out.
The optical phase conjugation and photoisomerization of some films of two kinds of polyesters functionalizied by 4-bis(N,N hydroxyethylene)-imino-4-nitroazobenzene have been studied.The photoresponsive mechanism of these films was explained quite well by a model of four-level energy system,which was consisting of two pairs of siglet states of trans and cis isomers,respectively.Photoismerization was the main intramolecular relaxtion between both two-level energy systems.Investigation on effects of pump intensities,polyester structures and thicknees of films has been also carried out.
1997, 21(5): 277-280.
Abstract:
We present a new scanning interferometer made by a ring resonator.The system design is based on mode coupling theory for matching two resonators.It is not necessary to have a isolator for measuring the operating mode of a laser.We also discusses the error of misalignment and mismatch caused by the laser cavity and ring resonator.The scanning interferometer will have wide application prospect.
We present a new scanning interferometer made by a ring resonator.The system design is based on mode coupling theory for matching two resonators.It is not necessary to have a isolator for measuring the operating mode of a laser.We also discusses the error of misalignment and mismatch caused by the laser cavity and ring resonator.The scanning interferometer will have wide application prospect.
1997, 21(5): 281-284.
Abstract:
A YAG slab oscillator and two-stage amplifier system has been built up.The free running and Q-switching experiments,using a novel YAG:Cr4+ colour centre crystal,have been performed,and have shown the advantage of the slab MOPA system capable of providing good beam quality due to its low thermal effects.
A YAG slab oscillator and two-stage amplifier system has been built up.The free running and Q-switching experiments,using a novel YAG:Cr4+ colour centre crystal,have been performed,and have shown the advantage of the slab MOPA system capable of providing good beam quality due to its low thermal effects.
1997, 21(5): 284-287.
Abstract:
The electronic control system for laser scanning confocal fluorescence microscope is described in this paper.For improvement of the positing precision of laser scanner,a high accuracy scanning image sampling method,based on pixels clock generator,is adapted to correct the non-linear output image pincushion distortion caused by the rotational inertial of the e mechanical parts of laser scanner.In order to detect the scanning spatial position under the case of step motor driving,according to the experimentally measured I-θ curve,we can get the phase current wave form which compensates the non-linearity of I-θ curve by means of interpolation method.Therefore,the step motor can operate with high angle uniformity under the condition of low current mode.
The electronic control system for laser scanning confocal fluorescence microscope is described in this paper.For improvement of the positing precision of laser scanner,a high accuracy scanning image sampling method,based on pixels clock generator,is adapted to correct the non-linear output image pincushion distortion caused by the rotational inertial of the e mechanical parts of laser scanner.In order to detect the scanning spatial position under the case of step motor driving,according to the experimentally measured I-θ curve,we can get the phase current wave form which compensates the non-linearity of I-θ curve by means of interpolation method.Therefore,the step motor can operate with high angle uniformity under the condition of low current mode.
1997, 21(5): 288-292.
Abstract:
This paper summarized some recent advances in the propagation of high-power lasers passing through amplifiers.Starting from Frantz-Nodvik equetion,using pulse-sequence and slab-loss and gain models,high-power lasers propagating through scingle-and multi-pass amplifiers have been studied in detail,which is suitable,in particular,for the can of nelatively large losses,and can be extended to dealing with the inverse problem of amplifiers by means of the succersive iferation computing method.
This paper summarized some recent advances in the propagation of high-power lasers passing through amplifiers.Starting from Frantz-Nodvik equetion,using pulse-sequence and slab-loss and gain models,high-power lasers propagating through scingle-and multi-pass amplifiers have been studied in detail,which is suitable,in particular,for the can of nelatively large losses,and can be extended to dealing with the inverse problem of amplifiers by means of the succersive iferation computing method.
1997, 21(5): 293-296.
Abstract:
This paper studies the influence of bi-dye on the output of flashlamp-pumped dye laser from the point of donor-acceptor dye system.We consider that radiation energy-transfer is the dominant energy transfer mechanism between donor and acceptor under low concentrations.After calculating the spectrum inversion rate of donor and acceptor,we conclude that in the donor-acceptor system the concentrations of donor and acceptor is low.We point out that separating donor from acceptor is the optimum way to use multi-dye system.Base on the theoretic analysis,we carry out some experiments on the repetition rate flashlamp-pumped dye laser,the results of the experiments agree with those of the theoretic analysis.
This paper studies the influence of bi-dye on the output of flashlamp-pumped dye laser from the point of donor-acceptor dye system.We consider that radiation energy-transfer is the dominant energy transfer mechanism between donor and acceptor under low concentrations.After calculating the spectrum inversion rate of donor and acceptor,we conclude that in the donor-acceptor system the concentrations of donor and acceptor is low.We point out that separating donor from acceptor is the optimum way to use multi-dye system.Base on the theoretic analysis,we carry out some experiments on the repetition rate flashlamp-pumped dye laser,the results of the experiments agree with those of the theoretic analysis.
1997, 21(5): 297-302.
Abstract:
A comparison of acute ocular damages of rabbit eyes induced by the coupling cavity injection mode-locked Nd:YAG laser picosecond pulse train and its doubled frequency 0.53μm pulse train and nanosecond pulse train using solid color centre crystal mode-locked was reported.The result showed that the ocular damages(ED50) was 83.5μJ at 1.06μm for mode-locked picosecond laser pulse train;the energy required to produce lesions in 40% events was 62.2μJ at 1.06μm and 6.1μJ at 0.53μm,ratio 10:1,and the dose required in 83.3% events,for nanosecond and picosecond laser pulse train,was 1190μJ and 260μJ at 1.06μm,ratio 5:1 approximately.
A comparison of acute ocular damages of rabbit eyes induced by the coupling cavity injection mode-locked Nd:YAG laser picosecond pulse train and its doubled frequency 0.53μm pulse train and nanosecond pulse train using solid color centre crystal mode-locked was reported.The result showed that the ocular damages(ED50) was 83.5μJ at 1.06μm for mode-locked picosecond laser pulse train;the energy required to produce lesions in 40% events was 62.2μJ at 1.06μm and 6.1μJ at 0.53μm,ratio 10:1,and the dose required in 83.3% events,for nanosecond and picosecond laser pulse train,was 1190μJ and 260μJ at 1.06μm,ratio 5:1 approximately.
1997, 21(5): 302-306.
Abstract:
Two fundamental requirements on the simultaneous adjustments of the grating reflection wavelength and cavity length,antireflection coating stacked on the rear facet of the semiconductor laser(LD) have been discussed quantitatively in order to realize a continuous tuning in an external semiconductor lasers.Studies indicate that the reported adjustable range of the cavity length is not a precondition for achieving the maximum tuning range,but rather a condition for practically achieving a continuous tuning.For certain antireflection coating stacked on the rear facet of the diode,the achievable continuous tuning range has been investigated.
Two fundamental requirements on the simultaneous adjustments of the grating reflection wavelength and cavity length,antireflection coating stacked on the rear facet of the semiconductor laser(LD) have been discussed quantitatively in order to realize a continuous tuning in an external semiconductor lasers.Studies indicate that the reported adjustable range of the cavity length is not a precondition for achieving the maximum tuning range,but rather a condition for practically achieving a continuous tuning.For certain antireflection coating stacked on the rear facet of the diode,the achievable continuous tuning range has been investigated.
1997, 21(5): 307-312.
Abstract:
The paper gives a brief introduction of the situation of researches on time optical solitons and spatial optical solitons,and pays particular attention to introduce the new progress of the researches on bright spatial optical solitons and dark spatial optical solitons.At last,it analyses the next research orientation on optical solitons.
The paper gives a brief introduction of the situation of researches on time optical solitons and spatial optical solitons,and pays particular attention to introduce the new progress of the researches on bright spatial optical solitons and dark spatial optical solitons.At last,it analyses the next research orientation on optical solitons.
1997, 21(5): 312-315.
Abstract:
This paper deals with the problem of solving the soliton wave equation with higher order effect.According to the solution of the soliton wave equation,the expressions of soliton energy and soliton momentum has been obtained.Finally,the influence of the higher order effects on the soliton communication is discussed.
This paper deals with the problem of solving the soliton wave equation with higher order effect.According to the solution of the soliton wave equation,the expressions of soliton energy and soliton momentum has been obtained.Finally,the influence of the higher order effects on the soliton communication is discussed.
1997, 21(5): 316-317.
Abstract:
We use a area CCD to acquire the data of the beam profile of a He-Ne laser.According to the data,we utilize the minimum square deviation to get the intensity profile curve,and define the peak point as the center of the laser beam.The accuracy of center location can be about 1μm.Then we employ the method to measure the prism angle and get the measurement precision up to 0.004°.
We use a area CCD to acquire the data of the beam profile of a He-Ne laser.According to the data,we utilize the minimum square deviation to get the intensity profile curve,and define the peak point as the center of the laser beam.The accuracy of center location can be about 1μm.Then we employ the method to measure the prism angle and get the measurement precision up to 0.004°.
1997, 21(5): 318-320.
Abstract:
In optical surface film coating,the ion auxiliary deposition(IAD) technique has been widely used.Based on the analysis on the operating condition of IAD,this article compares the two kinds of the ion auxiliary deposition techniques using hot cathode ion source and cold cathode ion source and points out that,with the help of cold ion source,the film deposited on the optical surfaces has the better microstructure.In vacuum deposition,using of the cold cathode ion source can reduce the deposition period.
In optical surface film coating,the ion auxiliary deposition(IAD) technique has been widely used.Based on the analysis on the operating condition of IAD,this article compares the two kinds of the ion auxiliary deposition techniques using hot cathode ion source and cold cathode ion source and points out that,with the help of cold ion source,the film deposited on the optical surfaces has the better microstructure.In vacuum deposition,using of the cold cathode ion source can reduce the deposition period.
