Chen, Yihong    Professor Dr.

Education & Training

1983Bachelor of Engineering, Huazhong University of Science & Technology
Wuhan, Hubei, P. R. China
Thesis: Study on Laser Heat Treatment of Blades for Steam Engines
Supervisor: Professor Zheng Qiguang

1986Master of Science, Huazhong University of Science and Technology
Thesis: Study on TEA CO2 Lasers
Supervisor: Professor Qiu Junlin

1998Ph. D.,Nanyang Technological University, Singapore
Thesis: Studies on Laser Design and Laser Micro-Machining
Supervisors: Dr. Tam Siu Chung & Dr. Zheng Hong Yu

09/1995Technical Writing & Presentation Skills for Engineers
by the Centre for Continuing Education of Nanyang Technological University

11/1996First-aid
by St. John Ambulance (Singapore) Pte Ltd

06/1999Design of Experiments
by Professor T. N. Goh of Industrial and System Engineering Department of National University of Singapore

06/1999Planning and Managing Projects
by Dr. Vincent Yip of Integrated Project Systems

Academic Activities

Membership

  1. Chairman, Wuhan Laser Association of Optics Valley of China from 2003
  2. Director, Laser Processing Committee of the Chinese Optical Society from 2003
  3. Director, Hubei Provincial Optical Society from 2003
  4. Member, SPIE
  5. Member, The Chinese Optical Society (COS)
  6. Vice Chairman, Hubei Provincial & Wuhan Laser Society
  7. Director, The Chinese Optical Society from 1989 to 1993
  8. Chairman, The Youth Committee of  the Chinese Optical Society from 1989 to 1991
  9. Secretary, Hubei Provincial Laser Society from 1990 to 1994 (part time)
  10. Vice Chairman, Hubei Provincial Laser Association from 2014
  11. Vice Chairman, Wuhan Optics Valley Laser Association from 2003
  12. Vice Chairman, Wuhan Opto-electronic Association from 2014

Editor

        Journal: Laser Technology from 1994 to 2002

Organizing Academic Conferences

  1. The Third National Conference on Optics organized by the Youth Committee of the Chinese Optical Society (Wuhan, Hubei, 1989)
  2. The Fifth National Conference on Optics organized by the Youth Committee of the Chinese Optical Society (Yichang, Hubei, 1991)
  3. The Three-Region Conference on Lasers organized by the Hubei Provincial Laser Society (Yichang, Hubei, 1990)

Attending Academic Conferences

  1. The First National Conference on Optics organized by the Youth Committee of the Chinese Optical Society (Hangzhou, Zhejiang, 1987)
  2. The Third National Conference on Optics organized by the Youth Committee of the Chinese Optical Society (Wuhan, Hubei, 1989)
  3. The Fifth National Conference on Optics organized by the Youth Committee of the Chinese Optical Society (Yichang, Hubei, 1991)
  4. The Third National Conference on Lasers and Laser Material Processing (Wuhan, Hubei, 1993)
  5. The International Conference on Precision Engineering'95 (2nd ICMT) (Singapore, 1995)
  6. The International Conference on Micro-Electronic Packaging and Laser Processing (Singapore, 1997)
  7. The International Conference on Photonic Systems and Applications in Defence and Manufacturing (Singapore, 1999)

R&D Activities

Lasers and Laser Machines

  1. Pulsed CO2 laser (1983-1988): photo-preionised TEA CO2 laser, laser power supply, resonators, and laser gas kinetics.
  2. TEA CO2 laser marking machine (1985-1989): optical delivery system, requirements for marking various materials.
  3. High-power CW helium-free CO2 laser (1988-1994): gas kinetics, DC laser power supply, resonators, heat exchange, and pre-ionization technology.
  4. High-power high-frequency excited CO2 laser (1990-1994): physics of high frequency gas discharge, HF laser power supply, discharge structure, and heat exchange.
  5. High-power CW CO2 Laser machining systems (1988-1994): laser welding machines (welding of rotator of electric motors), laser heat treatment machines (surface treatment of convex wheel axles of motorcycles), and laser cutting machines (for general purposes).
  6. Laser therapeutic apparatus (1990): portable CO2 lasers of 10W with pulsed and/or CW operation, and switching power supply.
  7. CW Nd:YAG laser & marking system (06/1994-08/1997): 60W YAG laser generator, resonator, stability, & scanning system.
  8. Pulsed Nd:YAG laser machining system (06/1994-08/1997): 300W YAG laser generator, resonator, beam quality, stability, & cooling system.
  9. Second harmonic generation of Nd:YAG laser (1994-1995): resonator, optics, crystal, beam quality & optimization.
  10. Development of an integrated inspection & laser drilling system for HPT vane (04/1996-08/1998): developing an integrated inspection and laser system to re-drill blocked cooling holes in jet engine turbine vanes.
  11. YAG laser marking, drilling and up-grading to higher harmonic wavelength (02/1998-09/98): developing the 2nd and 3rd harmonic YAG laser generators and studying laser marking and drilling with the YAG laser.
  12. Process studies with a Q-switched diode-pumped Nd:YAG laser (06/98-05/99): developing proper beam guide optics and performing investigations on welding, drilling, marking, PCB via hole drilling, surface structuring and surface cleaning.
  13. Preliminary investigation of laser induced titanium silicide formation
  14. Development of laser welding process under controlled inert gas environment (09/98-05/99): developing a laser welding process under inert gas environment for hermetic modules.
  15. Development of pulse Nd:YAG laser (02/00-10/00): develop a pulse Nd:YAG laser machine for spot welding of gold jewellery chains.
  16. Diode-pumped solid-state laser for materials processing (08/98-10/00): developing a diode-pumped YAG laser system suitable for laser materials processing such as marking and texturing.
  17. Diode-pumped solid-state laser (08/99-10/00): develop a diode-pumped solid-state laser for industrial use.
  18. Beam coupling and reshaping of laser diode arrays (09/99-07/00): develop an efficient method of beam coupling and reshaping for laser diode arrays.

Laser Applications

  1. Laser trimming for quartz (06/1994-10/1994): improving the frequency accuracy of quartz resonator by trimming.
  2. Laser micro-engraving of photomasks for liquid crystal display (06/1994-07/1996): optimizing the engraving processes.
  3. Specialized service on laser cutting of CHASISS (01/1995): optimizing cutting processes and cutting 200 pieces chassis.
  4. Development of laser micro-drilling technology with excimer laser (05/1995-10/1996): developing laser micro-drilling processes for various applications requiring hole size of 50 mm or below.
  5. Development of laser beam shaping technology for surface modification (09/1995-08/1997): developing adjustable rectangular beam shape with uniform distributions from Gaussian or multi-mode laser beams.
  6. Technology development program on laser marking (07/1996-10/1996): upgrading local companies in laser marking technologies via a seminar.
  7. Excimer laser scribing of ITO film for LCD (08/1996-08/1997): developing & optimizing process parameters of excimer & YAG laser scribing of special materials, and then designing the required system for high-volume production.
  8. Feasibility study on laser marking of mobile phone keymat (01/1997-03/1997): evaluating the technology and equipment requirements for laser marking on mobile phone keymats, marking samples with various types of lasers (excimer, CO2, N2, and Nd:YAG lasers).
  9. Investigation of laser marking on thermoplastic elastomers (03/1997-12/1997): evaluating the feasibility of laser color marking on thermoplastic elastomers.
  10. Laser marking tests for materials supplied by Kinergy Pte Ltd (09/1997-12/1997): optimizing parameters of laser marking on the new materials developed by Kinergy.
  11. Competency development of high power pulsed Nd:YAG laser (10/1997-05/1998): substantiating technologies in precision miniature fabrication with Lumonics laser.
  12. Process investigation and parameter optimization in laser cutting of PCB substrate (02/98-05/98): developing an optimal laser cutting process for FR4 substrate and identifying any harmful by-product from the laser cutting process.
  13. Laser drilling of VIAS holes (05/1997-07/1998): finding suitable laser systems and investigating drilling processes (direct drilling, conformal and mask projection drilling).
  14. Process development of laser marking on injection-molded mobile phone keymats (05/1997-08/1998): developing a new laser marking process and a new injection molding process of thermoplastic elastomers.
  15. Laser mark on stainless (09/98-12/98)
  16. Laser diode applications (04/98-01/99): setting-up laser diode technology and applications at Gintic.
  17. Nd:YAG laser processing with optical fiber (11/98-05/99): developing competency of using fiber optics for high power Nd:YAG laser in materials processing.
  18. Laser marking on metals (10/99-01/00): develop color-change marking technology.

R&D Interests ---- Collaboration welcome!

  1. Various types of lasers
  2. Laser machining systems
  3. Laser material processing with CO2, YAG & excimer lasers

Working Experience

2000-presentCEO, Sintec Optronics Pte Ltd

1994-2000Research Engineer (06/1994), Research Associate (01/1997), Associate Research Fellow (01/1998) & Research Fellow (01/1999)
Advanced Machining Group, Singapore Institute of Manufacturing Technology, Republic of Singapore

1986-1994Assistant (07/1986), Lecturer (12/1988) & Associate Professor (05/1993) National Engineering Research Centre for Laser Processing
and National Laboratory for Laser Technology, Huazhong University of Science & Technology Wuhan, Hubei, P. R. China

Awards

  1. The third-class prize for Progress in Science and Technology awarded by the People's Government of Hubei Province of China in 1988.
  2. The third-class prize for Progress in Science and Technology awarded by the Chinese State Education Committee in 1992.
  3. Excellent activist awarded by the Hubei Provincial Society of Science and Technology in 1993.
  4. Excellent Entrepreneur awarded by Wuhan Government in 2003
  5. “5.1 Labor Medal” awarded by Wuhan Government in 2003
  6. “Excellent Pioneer” awarded by Hubei Provincial Government in 2004
  7. “Excellent Pioneer” awarded by the State Council of the People’s Republic of China in 2005

Patents

1. 2000, Singapore patent, Method of preparing an integrated circuit package for laser marking, 200000516-5
2. 2000, Singapore patent, Process for laser marking metal surface, 200001597-4
3. 2003, China patent, Laser marker with anti-exploding, 02229385X
4. 2003, China patent, Auto-loading system for rings, ZL 2003 20116209.1
5. 2003, China patent, Laser marking for gas valves, ZL 2003 2 0116353.5
6. 2003, China patent, Reflective laser marker, ZL 03 2 54586.X
7. 2003, China patent, Control apparatus of laser marker, ZL 03 3 35648.3
8. 2006, China patent, A special apparatus for laser marking, ZL 2005 2 0060004.5
9. 2006, China patent, A work table for laser engraving using galvanometer scanner, ZL 2005 2 0060066.6
10. 2009, China patent, a compact laser marker, 200920059501.1
11. 2009, China patent, a laser marker with dual cross-red line positioning, 200920059502.6
12. 2009, China patent, motorized 3D stage for laser marking, 200920059484.1
13. 2009, China patent, a simple Z-axis adjustable table for laser marking, 200920059485.6
14. 2009, China patent, Marking method and equipment using a thermal sensing paper, 200910040859.4
15. 2009, China patent, a ceramic laser pump chamber, 200920061902.2
16. 2011, China patent, A new crystal assemble for diode end-pumped lasers, 201120134671.9
17. 2011, China patent, Water-cooled laser cutting head, 201120134656.4
18. 2011, New laser crystal assemble, 201120134671.9
19. 2011, water cooled laser cutting head, 201120134656.4
20. 2011, End-pumped air-cooled laser, 201120221330.5
21. 2011, End-pumped ceramic laser, 201120375003.5
22. 2011, Anti-collision fiber laser cutting head, ZL201220530671.5
23. 2011, Diode side-pumped solid-state laser, 201110298153.5
24. 2011, End-pumped air-cooled laser, 201110175897.8
25. 2012, Laser engraving machine for large filed application, ZL201220584042.0
26. 2012, A laser welding assistant set up for battery’s enclosure, ZL201220514217.0
27. 2012, Precision moving table, ZL201220531432.1
28. 2013, A 532nm green laser, 201320703515.9
29. 2013, A laser cutting table for engine’s cylinder, 201320754112.7
30. 2013, Rotary set up for tube’s processing, 201320743638.5
31. 2013, Loading system for engine’s cylinder, 201320743939.8
32. 2013, Loading set up for automatic cylinder, 201320744717.8
33. 2013, Unloading set up for cutting cylinders, 201320752565.6
34. 2013, Limit set up for cylinder’s cutting, 201320754001.6
35. 2014, Set up for automatic focusing, 201420234553.9
36. 2014, Solid-state laser for precision engraving, 201420454131.2
37. 2014, Automatic adjustment between laser scanner and workpiece, 201420454138.4
38. 2014, All solid-state diode-pumped UV laser,  201420469225.7
39. 2014, A hand-held, portable and moveable marking system, 201420454083.7
40. 2014, Beam splitter for dual laser marking heads, 201420454127.6
41. 2014, Fiber laser marker for large field, 201420454078.6
42. 2014, Laser cutting table, 201430237611.9
43. 2015, Laser cutting table for cutting engine’s cylinder, 201310604275.1
44. 2015, All solid-state diode end-pumped laser, 201520090922.6
45. 2015, Diode end-pumped solid-state laser, 201520091297.7
46. 2015, Set up for changing polarized output average laser power, 201520024320.0
47. 2015, Set up for changing linearly polarized output average laser power, 201520024316.4
48. 2015, Air-cooled UV laser, 201520178490.4

Selected Publications

  1. Chen Yihong, Review of Laser Processing Systems in China, LIA Today, Vol. 15, No. 4, 1,8-9 (in English)
  2. Wang Rugang, Chen Zhenqiang, Zhang ge, Lin Lang, Chen Yihong, Ding Tao, Contrast study of LD-pumped Nd:YVO4 and Nd:GdVO4 intracavity frequence doubling green laser, Photonics Technology, Vol. 27, No. 1 (2007), 13-16 (in Chinese)
  3. Chen Yihong, Su Yong, Study of High-power diode-pumped solid-state laser”, Chinese Journal of Laser, Vol. 44, No. S1 (2007), 319-321 (in Chinese)
  4. Chen Yihong, Review of Laser Industry and Market in China, International Conference on Laser Processing Technology, Dongguan, Guangdong China, May 2007 (in Chinese and English)
  5. Chen Yihong, Chiense Market Review of Laser Processing Systems, Laser Technology and Application, April 2007, 21-22 (in English)
  6. Chen Yihong, Review of Laser Processing Systems in China, International Conference on Laser Processes and Components (LPC 2007), Shanghai (in Chinese & English)
  7. Chen Yihong, Su Yong, Study of High-power diode-pumped solid-state laser”, The 8th China Conference on Laser Processing, Nov. 2006, Guangzhou (in Chinese)
  8. Chen Yihong, “Review of all-solidification solid-state lasers”, 2005 Optical Forum organised by Guangdong Provincial Optical Society, Zhaoqing (in Chinese)
  9. Chen Yihong, “Review of Industralization of all-solidification solid-state lasers”, 2005 Forum of Laser Technology and Industralization by the Ministry of Sci & Tech. of China (in Chinese)
  10. Chen Yihong, “Review of Industrial Lasers”, Laser Product World, October 2004, 15-22 (in Chinese)
  11. Liao Honghai, Hu Bing, Chen Yihong, “Review of Laser Marking Technology”, Laser Product World, April 2004, 28-33 (in Chinese)
  12. Chen Yihong, Zhao Bing, Zhao Dezhen and Cao Weidong, “Development and Research of all-solidification solid-state lasers”, Laser Product World, July 2003, 6-14 (in Chinese)
  13. Shi Yan, Li Song amd Chen Yihong, “Optimised design of laser resonator for diode side-pumped solid-state lasers”, Applied Laser, Vol. 23, No.2 (2003), 74-76, 96
  14. Chen Yihong, “Review of all-solidification solid-state lasers”, Conference on Chinese Laser Devices, April 2003, Jiangyin, Jiangsu
  15. Chen Yihong, Zhang Fawei, “Development of high-power diode-pumped solid-state lasers”, Laser Technology & Application, Vol. 10/11 (2002), 13-14 (in Chinese)
  16. Chen Yihong, Zhang Fawei, Zhao Bing, Zhao Dezheng, Cao Weidong, “Market review of industrial lasers”, J. of China University of Geosciences (Social Sciences Edition), Vol. 2, No. 4 (2002), 5-7(in Chinese)
  17. CHEN Yi-hong, Zhang Fawei, "Laser - core technology of photonics industry", International Electronic Equipment, May 2002, 21-24(in Chinese)
  18. Xiong Zhengjun, Chen Yihong, H J J Verheijen, Teh Kim Ming, "Optical Fibre Coupling of Laser Diode Arrays", SIMTech Technical Report (PT/01/007/AM) (2001)
  19. CHEN Yi-hong, ZHAO Bing, ZHAO De-zheng, “Research on high-power diode-pumped solid-state lasers”, J. of Optoelectronics*Lasers, Vol. 12, No. 12 (2001), 1234-1235(in Chinese)
  20. Yihong Chen, Fawei Zhang, "Applications of laser technology in automobile industry", Huichong Automobile Net, Oct. 29, 2001 (in Chinese)
  21. Yihong Chen, Fawei Zhang, "Laser technology and development of laser industries", The First Forum on Hubei Science and Technology, Oct. 2001, 82-84(in Chinese)
  22. Yihong Chen, Fawei Zhang, "Applications of laser welding technologies in automobile industry", Automobile Industry, No. 8 (2001), 46-47(in Chinese)
  23. Yihong Chen, Zhengjun Xiong, Gnian Cher Lim, Hong Yu Zheng, Xiaoyuan Peng, "High-efficiency Nd:YVO4 laser end-pumped with a diode laser bar", Proceedings of SPIE Vol. 3898 Photonic Systems and Applications in Defense and Manufacturing (1999), 148-155
  24. Y. H. Chen, H. Y. Zheng, K. S. Wong and S. C. Tam, "Excimer laser drilling of polymers", Proceedings of SPIE Vol. 3184 Micro-electronic Packaging and Laser Processing (1997), 202-210.
  25. Y. H. Chen, S. C. Tam, W. L. Chen and H. Y. Zheng, "Application of the Taguchi method in the optimization of laser micro-engraving of photomasks", International Journal of Materials and Product Technology, Vol. 11, No. 3/4 (1996), 333-344 (Ei Complex Plus: 97053438010)
  26. Chen Yi Hong, Chen Wei Long and Tam Siu Chung, "Parameter optimization in laser microengraving of photomasks with Taguchi method", Proc. of International Conference on Precision Engineering, Nov. 22-24, 1995, Singapore, 194-198.
  27. Chen Yi Hong, Chen Wei Long and Tam Siu Chung, "Calculation of optical parameters in laser engraving of photomasks", Proc. of 1995 International Conference on Optoelectronics and Lasers, Oct. 6-8,1995, Hangzhou, China, 365-368.
  28. Chen Yihong, "Photomask repair with lasers", 1994 Symposium for Chinese Young Scholars on Optical Application Technologies, August 8-12,1994, Chengdu, China.
  29. Chen Yihong, Din Yunmei, and Qiu Junlin, "Study on the photoinitiated impulse-enhanced electrically excited (PIE) preionization of CW CO2 laser", Laser Technology, Vol. 18, No. 4 (1994), 236-239 (Engineering Index: EIP94122461412).
  30. Chen Yihong, Tang Zhonghua, and Qiu Junlin, "Calculation of optical parameters for CO2 laser marking system", Laser Technology, Vol. 18, No. 1 (1994), 38-41 (Engineering Index: EIP94011167058).
  31. Chen Yihong, Li Wanrong and Qiu Junlin, "Development of TEA CO2 lasers & laser marking", Laser Technology, Vol. 17, No. 6 (1993), 30.
  32. Chen Yihong, Gong Zhiwei and Qiu Junlin, "2 kW Transverse flow helium-free CW CO2 laser", The 3rd Symposium of the Laser Processing Committee of the Chinese Optical Society (1993), Wuhan, China, 270.
  33. Chen Yihong, "High frequency excited CO2 laser", Laser Technology, Vol. 16, No. 3 (1992), 164-166.
  34. Chen Yihong, IBM-PC FORTRAN Operation Handbook, a text, HUST Press (1987).
  35. Chen Yihong, Li Wanrong, Qiu Junlin, "Study of a TEA laser marker and its applications", Laser Technology, Vol. 11, No. 5 (1987), 45.
  36. Chen Yihong, Li Wanrong, Liu Yangman, and Qiu Junlin, "Computation and measurement of the discharge parameters for a TEA CO2 laser", Laser Technology, Vol. 11, No. 2 (1987), 30-37.
  37. Chen Yihong, Li Wanrong, Yuan Yu and Qiu Junlin, "The influence of assistant gases on the homogeneous discharge in a TEA CO2 laser", Laser Technology, Vol. 11, No. 2 (1987), 7-11.
  38. Xiaoyuan Peng, Anand Asundi, Yihong Chen, Zhengjun Xiong, “Heating measurements in diode-end-pumped Nd:YVO4 lasers”, Optical Engineering, 40(6) (June 2001) 1100-1105
  39. Xiaoyuan Peng, Anand Asundi, Yihong Chen, and Zhengjun Xiong, “Study of the mechanical properties of Nd:YVO4 crystal by use of laser interferometry and finite-element analysis”, Applied Optics, Vol. 40, No. 9 (2001), 1396-1403
  40. Xiaoyuan Peng, Anand Asundi, Yihong Chen, Zhengjun Xiong and Gnian Cher Lim, "Determination of lasing material properties using laser interferometry and finite-element method", Proc. of SPIE (2000).
  41. Peng Xiaoyuan, Anand Asundi, Chen Yihong, Xiong Zhengjun, G. C. Lim, "Laser Interferometry Determination on Thermal Effects of Diode-End-Pumped Nd: YVO4 Laser", Proc. SPIE Vol. 3929 Solid State Lasers I (2000),193-198.
  42. Gu, Jianhui; Tam, Siu Chung; Lam, Yee Loy; Chen, Yihong; Kam, Chan Hin; Tan, Wilson; Xie, WenJie; Zhao, Gang; Yang, Hongru, "Novel use of GaAs as a passive Q-switch as well as an output coupler for diode-pumped infrared solid state lasers", Proc. SPIE Vol. 3929 Solid State Lasers IX (2000), 222-228.
  43. Jianhui Gu, Siu-Chung Tam, Yee-Loy Lam, Chan-Hin Kam, Hong Ru, Jingang Liu, Wenjie Xie, Gang Zhao, Yihong Chen and Wilson Tan, "Investigation on the use of semiconductor as Q-switch as well as output coupler for diode-pumped solid-state lasers", Technical Digest, paper CThM16, CLEO 2000, CA, May 5-7, 2000.
  44. Anand Asundi, Peng Xiaoyuan, Chen Yihong, Xiong Zhengjun, G C Lim, Zheng Hongyu, "Thermal effects of diode end-pumped Nd:YVO4 solid state laser", Proc. of SPIE Vol. 3898 Photonic Systems and Applications in Defence and Manufacturing (1999), 178-185
  45. Weiling Huang, Ying Gao, Hailin Wang, Zhouyou Zhou, Yihong Chen, "Measurement of thermal focal length with M2 in solid state lasers", Proceedings of SPIE Vol. 3862 Industrial Lasers (1999), 199-204
  46. Jianhui Gu, Feng Zhou, Siu Chung Tam, Wenjie Xie, Yee Loy Lam, and Yihong Chen, "Passive Q-switching of a Nd:YAG laser with a GaAs output coupler", Optical Engineering, Vol. 38, No. 11 (1999), 1785-1788
  47. S. C. Tam, Y. H. Chen and H. Y. Zheng, "Scribing of ITO-coatings using a Q-switched Nd:YAG laser", Proceedings of SPIE Vol. 3184 Micro-electronic Packaging and Laser Processing (1997), 186-194.
  48. Li Jiawei, Wang Ying and Chen Yihong, "Lasers with single lamp and dual rods", Laser Technology, Vol. 20, No. 2 (1996), 85-87 (Engineering Index: EIP96093342338).
  49. Li Jiawei, Wang Ying, Chen Yihong and Wu Changjun, "Portional coupling efficiencies in intersecting circular cavities", Laser Technology, Vol. 20, No. 3 (1996), 133-137 (Engineering Index: EIP96093342349).
  50. Chen Peifeng, Qiu Junlin, Gong Zhiwei, Tang Zhong Hua, Chen Yihong, and Chen Tao, "Mechanism of sudden-change of output power of TF CO2 laser", Chinese Journal of Lasers, Vol. 21, No. 10 (1994), 785-788 (Engineering Index: EIP95032612552).
  51. Chen Peifeng, Qiu Junlin, Gong Zhiwei, Tang Zhong Hua, Chen Yihong, and Chen Tao, "Asymmetrical thermal distortion of the output window of a CO2 laser", Laser Journal, Vol. 15, No. 3 (1994), 113-116, 124 (Engineering Index: EIP94101415312).
  52. Chen Peifeng, Qiu Junlin, Gong Zhiwei, Tang Zhonghua, Chen Yihong, and Chen Tao, "Performance analysis of radiator for transverse flow helium-free CO2 laser", Laser Technology, Vol. 17, No. 5 (1993), 289-291 (Engineering Index: EIP94011167061).
  53. Chen Tao, Qiu Junlin, Wang Xianjun, Chen Yihong, Gong Zhiwei, Chen Peifeng and Tang Zhonghua, "Helium-free transverse flow CO2 laser excited by high frequency", Proc. of SPIE, Vol. 1979 Lasers and Optoelectronics (1992), 72-75.
  54. Sun Junqiang, Chen Yihong, Gong Zhiwei, Tang Zhonghua, Zhao Debao and Qiu Junlin, "Investigation of 2.5 kW transverse flow CO2 (helium-free) laser", Laser Technology, Vol. 16, No. 1 (1992), 18-21.
  55. Sun Shuhua, Zhang Zhongzhen, Chen Yihong and Qiu Junlin, "Unstable resonator with feedback amplification", Laser & Infrared, Vol. 20, No. 2 (1991) , 205.
  56. Qiu Junlin, Zhang Zhongzhen and Chen Yihong, "Study of aperture confocal unstable cavity (ACUC)", Joint Publication of Applied Laser, Vol. 2, No. 2 (1989), 90-92.

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