//www.getgobooth.com/ 必威体育下载 daily 15 2024-08-20 10:33:39 apsoffice@iphy.ac.cn apsoffice@iphy.ac.cn 2024-08-20 10:33:39 zh Copyright ©Acta Physica Sinica All Rights Reserved. 京ICP备05002789号-1 Address: PostCode：100190 Phone: 010-82649829，82649241,82649863 Email: apsoffice@iphy.ac.cn Copyright ©Acta Physica Sinica All Rights Reserved apsoffice@iphy.ac.cn 1000-3290 //www.getgobooth.com/en/article/doi/10.7498/aps.27.361 Author(s): LIN FU-CHENG, ZHANG SHAN-SHAN, LIN HE <br/><p>The laser transition cross sections of YAP:Nd crystals are calculated by using group theory. The values of these cross sections for general elliptically polarized light are shown to be determined by three parameters. The theoretical results are verified by experiments and demonstrated by the construction of a wave length variable laser. We analysed two laser structures in which the transmission matrices are U-matrices, and calculated the polarizations and frequencies of their eigenmodes. Experimental results agree with the theory well. The results obtained in our work can be used in construc-tion of a single longitudinal mode laser with enhance output and to suggest a new method of modulation for lasers.</p> <br/>Acta Physica Sinica. 1978 27(4): 361-374. Published 1978-02-05 Author(s): LIN FU-CHENG, ZHANG SHAN-SHAN, LIN HE <br/><p>The laser transition cross sections of YAP:Nd crystals are calculated by using group theory. The values of these cross sections for general elliptically polarized light are shown to be determined by three parameters. The theoretical results are verified by experiments and demonstrated by the construction of a wave length variable laser. We analysed two laser structures in which the transmission matrices are U-matrices, and calculated the polarizations and frequencies of their eigenmodes. Experimental results agree with the theory well. The results obtained in our work can be used in construc-tion of a single longitudinal mode laser with enhance output and to suggest a new method of modulation for lasers.</p> <br/>Acta Physica Sinica. 1978 27(4): 361-374. Published 1978-02-05 LASER TRANSITION CROSS SECTIONS OF YAP:Nd CRYSTALS AND SOME NEW APPLICATIONS IN LASERS LIN FU-CHENG, ZHANG SHAN-SHAN, LIN HE 1978-02-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1978 27(4): 361-374. article doi:10.7498/aps.27.361 10.7498/aps.27.361 Acta Physica Sinica 27 4 1978-02-05 //www.getgobooth.com/en/article/doi/10.7498/aps.27.361 361-374 //www.getgobooth.com/en/article/doi/10.7498/aps.27.375 Author(s): ZHAN DA-SAN <br/><p>In this article we consider the statistical properties of the superposition of a partially polarized speckle pattern and a coherent background in an arbitrary polariza-tion state.</p> <br/>Acta Physica Sinica. 1978 27(4): 375-382. Published 1978-02-05 Author(s): ZHAN DA-SAN <br/><p>In this article we consider the statistical properties of the superposition of a partially polarized speckle pattern and a coherent background in an arbitrary polariza-tion state.</p> <br/>Acta Physica Sinica. 1978 27(4): 375-382. Published 1978-02-05 THE STATISTICAL PROPERTIES OF THE SUPERPOSITION OF A SPECKLE PATTERN AND A COHERENT BACKGROUND ZHAN DA-SAN 1978-02-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1978 27(4): 375-382. article doi:10.7498/aps.27.375 10.7498/aps.27.375 Acta Physica Sinica 27 4 1978-02-05 //www.getgobooth.com/en/article/doi/10.7498/aps.27.375 375-382 //www.getgobooth.com/en/article/doi/10.7498/aps.27.383 Author(s): GAO ZHI <br/><p>A pulse "flow-stretching" technique is suggested in an attempt to increase pulse width in the CO2 lasers. The conditions, characteristics and requirements of pulse flow-stretching are elucidated. Optical cavity is located on the downstream of the dis-charge region, or they may be partly overlapped. The pulse width so broadened could be just greater than the time required for the stream to cross over the discharge region. This is an upper limit of pulse stretching. The analytical solution for non-equilibrium relaxation processes without radiation is obtained. The small-signal gain characteristics is presented. By utilizing the theory given in the articles[18,19], we have calculated the power output and the efficiency. The small-signal gain is in the range of nearly a few thousandth to a few hundredth per centimeter and energy efficiency, 5-15%. Influences of gas composition and pressure on the power output and effici-ency have been considered.</p> <br/>Acta Physica Sinica. 1978 27(4): 383-395. Published 1978-02-05 Author(s): GAO ZHI <br/><p>A pulse "flow-stretching" technique is suggested in an attempt to increase pulse width in the CO2 lasers. The conditions, characteristics and requirements of pulse flow-stretching are elucidated. Optical cavity is located on the downstream of the dis-charge region, or they may be partly overlapped. The pulse width so broadened could be just greater than the time required for the stream to cross over the discharge region. This is an upper limit of pulse stretching. The analytical solution for non-equilibrium relaxation processes without radiation is obtained. The small-signal gain characteristics is presented. By utilizing the theory given in the articles[18,19], we have calculated the power output and the efficiency. The small-signal gain is in the range of nearly a few thousandth to a few hundredth per centimeter and energy efficiency, 5-15%. Influences of gas composition and pressure on the power output and effici-ency have been considered.</p> <br/>Acta Physica Sinica. 1978 27(4): 383-395. Published 1978-02-05 “FLOW-STRETCHING”OF PULSES IN PULSED CO&lt;sub&lt;2&lt;/sub&lt; LASERS——A STUDY OF HIGH PRESSURE,FAST SPEED FLOW,PULSE EXCITED AND QUASI CONTINUOUS OUTPUT CO&lt;sub&lt;2&lt;/sub&lt; LASERS GAO ZHI 1978-02-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1978 27(4): 383-395. article doi:10.7498/aps.27.383 10.7498/aps.27.383 Acta Physica Sinica 27 4 1978-02-05 //www.getgobooth.com/en/article/doi/10.7498/aps.27.383 383-395 //www.getgobooth.com/en/article/doi/10.7498/aps.27.396 Author(s): LIN GUANG-HAI <br/><p>Based on a microscopic molecular model, an analytical expression for the satura-tion intensity is obtained. By taking into account of the changes in gas pressure, temperature and flow velocity, the saturation intensity and small-sgnalgain coefficient at all points in the active region have been calculated under a variety of parameters. We have analysed and discussed the effects of the changes of pressure, flow velocity, gas composition and the discharge specific power on saturation intensity and small-signal gain coefficient. Finally, the calculated values for saturation intensity are compared with experimental results and good agreements are found.</p> <br/>Acta Physica Sinica. 1978 27(4): 396-412. Published 1978-02-05 Author(s): LIN GUANG-HAI <br/><p>Based on a microscopic molecular model, an analytical expression for the satura-tion intensity is obtained. By taking into account of the changes in gas pressure, temperature and flow velocity, the saturation intensity and small-sgnalgain coefficient at all points in the active region have been calculated under a variety of parameters. We have analysed and discussed the effects of the changes of pressure, flow velocity, gas composition and the discharge specific power on saturation intensity and small-signal gain coefficient. Finally, the calculated values for saturation intensity are compared with experimental results and good agreements are found.</p> <br/>Acta Physica Sinica. 1978 27(4): 396-412. Published 1978-02-05 THE SATURATION CHARACTERISTICS OF ELECTRIC DISCHARGE CONVECTION CO&lt;sub&lt;2&lt;/sub&lt; LASER LIN GUANG-HAI 1978-02-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1978 27(4): 396-412. article doi:10.7498/aps.27.396 10.7498/aps.27.396 Acta Physica Sinica 27 4 1978-02-05 //www.getgobooth.com/en/article/doi/10.7498/aps.27.396 396-412 //www.getgobooth.com/en/article/doi/10.7498/aps.27.413 Author(s): ZHANG GUANG-YIN <br/><p>By selecting appropriate cavity configurations, the astigmatism of optical mode in spherical mirror folded cavities can be partially eliminated and regulated. The codi-tion of anastigmatism elimination for output branch of spherical mirror folded cavities is calculated by means of the transformation circle diagram.</p> <br/>Acta Physica Sinica. 1978 27(4): 413-420. Published 1978-02-05 Author(s): ZHANG GUANG-YIN <br/><p>By selecting appropriate cavity configurations, the astigmatism of optical mode in spherical mirror folded cavities can be partially eliminated and regulated. The codi-tion of anastigmatism elimination for output branch of spherical mirror folded cavities is calculated by means of the transformation circle diagram.</p> <br/>Acta Physica Sinica. 1978 27(4): 413-420. Published 1978-02-05 THE ELIMINATION AND REGULATION OF ASTIGMATISM IN SPHERICAL MIRROR FOLDED CAVITIES ZHANG GUANG-YIN 1978-02-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1978 27(4): 413-420. article doi:10.7498/aps.27.413 10.7498/aps.27.413 Acta Physica Sinica 27 4 1978-02-05 //www.getgobooth.com/en/article/doi/10.7498/aps.27.413 413-420 //www.getgobooth.com/en/article/doi/10.7498/aps.27.421 Author(s): XU JIE-PING <br/><p>According to the actual practical condition of acousto-optical deflectors, by solving Dixon equations of abnormal Bragg diffraction under the condition of fixed incident light direction ?1, the functional dependences of the ultrasonic wave direction ?a. which gave rise the acousto-optical interaction and the diffraction light direction ?2 on the frequency f are obtained. From the ?a-f relationship, the important design parameters, i.e., the Bragg bandwidth and the transducer length, can be determined accurately. The ?2-f relationship shows good linearity, hence the previously proposed corrections on scanning linearity appear to be unnecessary.</p> <br/>Acta Physica Sinica. 1978 27(4): 421-429. Published 1978-02-05 Author(s): XU JIE-PING <br/><p>According to the actual practical condition of acousto-optical deflectors, by solving Dixon equations of abnormal Bragg diffraction under the condition of fixed incident light direction ?1, the functional dependences of the ultrasonic wave direction ?a. which gave rise the acousto-optical interaction and the diffraction light direction ?2 on the frequency f are obtained. From the ?a-f relationship, the important design parameters, i.e., the Bragg bandwidth and the transducer length, can be determined accurately. The ?2-f relationship shows good linearity, hence the previously proposed corrections on scanning linearity appear to be unnecessary.</p> <br/>Acta Physica Sinica. 1978 27(4): 421-429. Published 1978-02-05 THE BANDWIDTH AND SCANNING LINEARITY OF PARATELLURITE ACOUSTO-OPTICAL DEFLECTORS XU JIE-PING 1978-02-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1978 27(4): 421-429. article doi:10.7498/aps.27.421 10.7498/aps.27.421 Acta Physica Sinica 27 4 1978-02-05 //www.getgobooth.com/en/article/doi/10.7498/aps.27.421 421-429 //www.getgobooth.com/en/article/doi/10.7498/aps.27.430 Author(s): SUN XIN, LU YAN, LUO LIAO-FU <br/><p>The energy levels, selection rules, transition probabilities, spectra and spectral line intensities of an atom with a charged magnetic monopole as its nucleus (known as "monopole hydrogen atom") are calculated. The intensity ratio of three characteristic absorption lines (2774?, 2734?, 2191?) is 37:50:6.</p> <br/>Acta Physica Sinica. 1978 27(4): 430-438. Published 1978-02-05 Author(s): SUN XIN, LU YAN, LUO LIAO-FU <br/><p>The energy levels, selection rules, transition probabilities, spectra and spectral line intensities of an atom with a charged magnetic monopole as its nucleus (known as "monopole hydrogen atom") are calculated. The intensity ratio of three characteristic absorption lines (2774?, 2734?, 2191?) is 37:50:6.</p> <br/>Acta Physica Sinica. 1978 27(4): 430-438. Published 1978-02-05 THE SPECTRA OF MONOPOLE HYDROGEN ATOM SUN XIN, LU YAN, LUO LIAO-FU 1978-02-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1978 27(4): 430-438. article doi:10.7498/aps.27.430 10.7498/aps.27.430 Acta Physica Sinica 27 4 1978-02-05 //www.getgobooth.com/en/article/doi/10.7498/aps.27.430 430-438 //www.getgobooth.com/en/article/doi/10.7498/aps.27.439 Author(s): PU FU-CHO, WANG DING-SHENG <br/><p>Starting from the nonlinear differential equation for a non-uniform ferromagnet in mean field approximation, we apply the bifurcation theory to discuss the pheno-mena of magnetic phase transition. It is shown that (1) the Curie point of the system is determined by the maximium eigenvalue of linearized equation; (2) the space varia-tion of magnetization just below the Curie point is described by the corresponding eigenfunction; (3) the temperature dependence of magnetization is represented by the parameter a(T)～(l-T:Tc)1/2. In the later parts of our paper, the application of this method is illustrated by examples of thin films and a simple model proposed for describ-ing non-uniform ferromagnet.</p> <br/>Acta Physica Sinica. 1978 27(4): 439-447. Published 1978-02-05 Author(s): PU FU-CHO, WANG DING-SHENG <br/><p>Starting from the nonlinear differential equation for a non-uniform ferromagnet in mean field approximation, we apply the bifurcation theory to discuss the pheno-mena of magnetic phase transition. It is shown that (1) the Curie point of the system is determined by the maximium eigenvalue of linearized equation; (2) the space varia-tion of magnetization just below the Curie point is described by the corresponding eigenfunction; (3) the temperature dependence of magnetization is represented by the parameter a(T)～(l-T:Tc)1/2. In the later parts of our paper, the application of this method is illustrated by examples of thin films and a simple model proposed for describ-ing non-uniform ferromagnet.</p> <br/>Acta Physica Sinica. 1978 27(4): 439-447. Published 1978-02-05 THE MEAN FIELD THEORY FOR SPONTANEOUS MAGNETIZATION OF A NON-UNIFORM FERROMAGNET PU FU-CHO, WANG DING-SHENG 1978-02-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1978 27(4): 439-447. article doi:10.7498/aps.27.439 10.7498/aps.27.439 Acta Physica Sinica 27 4 1978-02-05 //www.getgobooth.com/en/article/doi/10.7498/aps.27.439 439-447 //www.getgobooth.com/en/article/doi/10.7498/aps.27.448 Author(s): LUO ZHENG-MING <br/><p>By using two kinds of wangerin transformations, the external analytical solutions for a set of important conventional configurations with quasi-elliptical cross sections (including such configurations, as elliptical, tear drop, fingerring, etc.) are obtained. These solutions are not subject to the limitation of small aspect ratio. In the vaccum region near the plasma boundary, a simple approximate solution is found.</p> <br/>Acta Physica Sinica. 1978 27(4): 448-458. Published 1978-02-05 Author(s): LUO ZHENG-MING <br/><p>By using two kinds of wangerin transformations, the external analytical solutions for a set of important conventional configurations with quasi-elliptical cross sections (including such configurations, as elliptical, tear drop, fingerring, etc.) are obtained. These solutions are not subject to the limitation of small aspect ratio. In the vaccum region near the plasma boundary, a simple approximate solution is found.</p> <br/>Acta Physica Sinica. 1978 27(4): 448-458. Published 1978-02-05 THE EXTERNAL SOLUTIONS OF THE EQUILIBRIUM OF PLASMA WITH QUASI-ELLIPTICAL CROSS SECTION IN A TOROIDAL AXIAL-SYMMETRIC SYSTEM LUO ZHENG-MING 1978-02-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1978 27(4): 448-458. article doi:10.7498/aps.27.448 10.7498/aps.27.448 Acta Physica Sinica 27 4 1978-02-05 //www.getgobooth.com/en/article/doi/10.7498/aps.27.448 448-458 //www.getgobooth.com/en/article/doi/10.7498/aps.27.459 Author(s): ZHAO SONG-LING, LU YUAN-WEI <br/><p>In this paper, a theory is presented for the linear acoustic resistance of an orifice in an infinite thin plate. For high frequency and/or great orifice, an approximating formula is derived, while the limiting value is obtained in opposite case. Theoretical calculations are in consistency with experimental data. Finally, an approximating formula which is applicable for the whole frequency range is given.</p> <br/>Acta Physica Sinica. 1978 27(4): 459-469. Published 1978-02-05 Author(s): ZHAO SONG-LING, LU YUAN-WEI <br/><p>In this paper, a theory is presented for the linear acoustic resistance of an orifice in an infinite thin plate. For high frequency and/or great orifice, an approximating formula is derived, while the limiting value is obtained in opposite case. Theoretical calculations are in consistency with experimental data. Finally, an approximating formula which is applicable for the whole frequency range is given.</p> <br/>Acta Physica Sinica. 1978 27(4): 459-469. Published 1978-02-05 ON THE LINEAR ACOUSTIC RESISTANCE OF AN ORIFICE IN AN INFINITE THIN PLATE ZHAO SONG-LING, LU YUAN-WEI 1978-02-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1978 27(4): 459-469. article doi:10.7498/aps.27.459 10.7498/aps.27.459 Acta Physica Sinica 27 4 1978-02-05 //www.getgobooth.com/en/article/doi/10.7498/aps.27.459 459-469 //www.getgobooth.com/en/article/doi/10.7498/aps.27.470 Author(s): ZHANG JING-GUO <br/><p></p> <br/>Acta Physica Sinica. 1978 27(4): 470-472. Published 1978-02-05 Author(s): ZHANG JING-GUO <br/><p></p> <br/>Acta Physica Sinica. 1978 27(4): 470-472. Published 1978-02-05 MEASUREMENT OF THE BAND WIDTH OF ELECTRON CHANNELLING PATTERNS IN SCANNING ELECTRON MICROSCOPY ZHANG JING-GUO 1978-02-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1978 27(4): 470-472. article doi:10.7498/aps.27.470 10.7498/aps.27.470 Acta Physica Sinica 27 4 1978-02-05 //www.getgobooth.com/en/article/doi/10.7498/aps.27.470 470-472 //www.getgobooth.com/en/article/doi/10.7498/aps.27.473 Author(s): GUO KE-XIN <br/><p></p> <br/>Acta Physica Sinica. 1978 27(4): 473-475. Published 1978-02-05 Author(s): GUO KE-XIN <br/><p></p> <br/>Acta Physica Sinica. 1978 27(4): 473-475. Published 1978-02-05 ON THE EXTINCTION PROBLEM IN THE AUTOMATIC INDEXING OF ELECTRON DIFFRACTION PATTERNS GUO KE-XIN 1978-02-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1978 27(4): 473-475. article doi:10.7498/aps.27.473 10.7498/aps.27.473 Acta Physica Sinica 27 4 1978-02-05 //www.getgobooth.com/en/article/doi/10.7498/aps.27.473 473-475 //www.getgobooth.com/en/article/doi/10.7498/aps.27.476 Author(s): BAO ZI-WEI, WEI RONG-JUE <br/><p></p> <br/>Acta Physica Sinica. 1978 27(4): 476-479. Published 1978-02-05 Author(s): BAO ZI-WEI, WEI RONG-JUE <br/><p></p> <br/>Acta Physica Sinica. 1978 27(4): 476-479. Published 1978-02-05 STUDY ON SPEAKER'S VOICE QUALITY THROUGH ANALYSIS OF SPEECH NOISE BAO ZI-WEI, WEI RONG-JUE 1978-02-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1978 27(4): 476-479. article doi:10.7498/aps.27.476 10.7498/aps.27.476 Acta Physica Sinica 27 4 1978-02-05 //www.getgobooth.com/en/article/doi/10.7498/aps.27.476 476-479 //www.getgobooth.com/en/article/doi/10.7498/aps.27.480 Author(s): GAN ZI ZHAO, YANG GUO-ZHEN, FENG KE-AN, HUANG XI-YI <br/><p></p> <br/>Acta Physica Sinica. 1978 27(4): 480-482. Published 1978-02-05 Author(s): GAN ZI ZHAO, YANG GUO-ZHEN, FENG KE-AN, HUANG XI-YI <br/><p></p> <br/>Acta Physica Sinica. 1978 27(4): 480-482. Published 1978-02-05 A THEORY OF MULTIPHOTON DISSOCIATION OF MOLECULES IN AN INTENSE I. R. LASER FIELD GAN ZI ZHAO, YANG GUO-ZHEN, FENG KE-AN, HUANG XI-YI 1978-02-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1978 27(4): 480-482. article doi:10.7498/aps.27.480 10.7498/aps.27.480 Acta Physica Sinica 27 4 1978-02-05 //www.getgobooth.com/en/article/doi/10.7498/aps.27.480 480-482 //www.getgobooth.com/en/article/doi/10.7498/aps.27.483 Author(s): DONG BI-ZHEN, CHEN ZHENG-HAO, CHEN YAN-SONG, DENG DAO-QUN, JU RUI <br/><p></p> <br/>Acta Physica Sinica. 1978 27(4): 483-486. Published 1978-02-05 Author(s): DONG BI-ZHEN, CHEN ZHENG-HAO, CHEN YAN-SONG, DENG DAO-QUN, JU RUI <br/><p></p> <br/>Acta Physica Sinica. 1978 27(4): 483-486. Published 1978-02-05 THE WIDE-ANGLE HOLOGRAPHY DONG BI-ZHEN, CHEN ZHENG-HAO, CHEN YAN-SONG, DENG DAO-QUN, JU RUI 1978-02-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1978 27(4): 483-486. article doi:10.7498/aps.27.483 10.7498/aps.27.483 Acta Physica Sinica 27 4 1978-02-05 //www.getgobooth.com/en/article/doi/10.7498/aps.27.483 483-486

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