Introduction to Fujikura - fiber specialist's technology platform for fiber laser products

High power laser diodes

High power laser diodes

World's highest brightness by original laser technology

Overwhelming semiconductor laser with DCH (Decoupled Confinement Heterostructure) technology achieved superior brightness and operates as a highly reliable light source for our fiber lasers. There are few fiber laser makers in the world which own high power semiconductor laser chip manufacturing technologies.

Related website: Optoenergy - Semiconductor lasers

Optical fiber for telecommunications

Optical fiber for telecommunications

Accumulated trackrecords for telecom infrastructure

Fujikura has been an optical fiber specialist for years where industry and customers demand 20 year reliability and its product line prevails all over the world. This technology base has been fully utilized to develop our high quality fiber laser products and to continuously develop various specialty optical fibers.

Related website: Fujikura product - Optical fibers

Optical fiber couplers

Optical fiber couplers

Unprecedentedly reliable fused couplers

Optical fiber couplers are key devices combining multiple optical fibers without remarkable light loss through connections. Highly- esteemed Fujikura PM couplers are used for marine cable repeaters that require extraordinary reliability. This coupler technology is utilized for fiber laser development with superior efficiency as well as outstanding reliability.

Related website: Fujikura product - Fused couplers

FBG (Fiber Bragg Grating)

FBG技術(Fiber Bragg Grating)

Reflecting mirror function - key device for fiber laser resonation

In order to oscillate laser light, a couple of FBGs that function as mirrors sandwich rare-earth-doped optical fiber in fiber laser structures. FBG is an important optical device determining laser oscillation characteristics. Fujikura has accumulated FBG designing and mass-manufacturing technologies in telecom industry, which contribute to develop fiber laser products.

Related website: Fujikura product - Fiber Bragg Grating

Optical isolator

Optical isolator

"One-way" optical device minimizes fiber laser damage

Optical isolator is a key device blocking optical feedback from target materials. This function not only prevents fiber lasers from damage but also stabilize laser beam output power. Although garnet crystal called 'TGG' is generally used for optical isolator specifically for fiber lasers, Fujikura applies special crystal called 'TSLAG' co-developed with NIMS (National Institute for Material Science of Japan) to its fiber laser products. TSLAG contributes to high quality, low cost production of optical isolators as the crystal is better suited for large size, homogeneous configuration in production from the perspective of its constituent materials.

Related website: Fujikura R&D - Optical Isolator

Specialty fibers

Specialty fibers

PANDA fibers - specialty optical fiber products

PANDA fibers are optical devices used to deliver light maintaining its polarization, which is an indispensable technology for a wavelength converter to shorten wavelength of light emitting from fiber lasers. Its polarization-maintaining property also makes difference in processing crystal that has specific polarization features. Fujikura specialty fibers offer environmentally resistant products for aerospace application and are highly praised in global optical markets.

Related website: Fujikura product - PANDA fiber

Fusion splicers

Fusion splicers

Fujikura fusion splicers has world's greatest market share

In a fiber laser structure, optical fibers play important roles to combine multiple optical devices, where Fujikura fusion splicers also assume key role to cleave and splice those fibers. As it comes to higher power beam delivery, fusion splicing technologies minimizing fiber coupling losses become increasingly important. Fujikura has gained fusion splicing technologies and experiences in telecom and optical fields for a long time.

Related website: Fujikura product - Fusion splicers

Cooling technology

Cooling technology / thermal solutionsThermal solutions Cooling technology / the K computerthe K computer by Fujitsu

Enhanced performance thermal solutions

Light source diode lasers in a fiber laser have extremely high wall-plug efficiency, however, collectively massive heat from electricity conversion loss needs to be cooled down economically. Fujikura's accumulated thermal solutions contribute to further high power fiber laser development.

Related website: Fujikura product - Thermal

Fujikura technology update

  1. Yuji Yamagata, Yumi Yamada, Masanori Muto, Syunta Sato, Ryozaburo Nogawa, Akira Sakamoto, and Masayuki Yamaguchi “915nm high-power broad area laser diodes with ultra-small optical confinement based on Asymmetric Decoupled Confinement Heterostructure (ADCH)”, Proc. SPIE 9348, High-Power Diode Laser Technology and Applications XIII, 93480F (13 March 2015)　
  2. Y. Mashiko, H. K. Nguyen, M. Kashiwagi, T. Kitabayashi, K. Shima, and D. Tanaka “2 kW single-mode fiber laser with 20-m long delivery fiber and high SRS suppression”, Proc. SPIE 9728, Fiber Lasers XIII: Technology, Systems, and Applications, 972805 (9 March 2016)　
  3. Yohei Kasai, Shinichi Sakamoto, Yukihiko Takahashi, Ken Katagiri, Yuji Yamagata, Akira Sakamoto, and Daiichiro Tanaka “High-brightness laser diode module over 300W with 100μm/Na 0.22 fiber”, Proc. SPIE 9733, High-Power Diode Laser Technology and Applications XIV, 973309 (4 March 2016)　
  4. S. Ikoma, H. K. Nguyen, M. Kashiwagi, K. Uchiyama, K. Shima, and D. Tanaka “3 kW single stage all-fiber Yb-doped single-mode fiber laser for highly reflective and highly thermal conductive materials processing”, Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 100830Y (22 February 2017)　
  5. Yohei Kasai, Yuji Yamagata, Yoshikazu Kaifuchi, Akira Sakamoto, and Daiichiro Tanaka “High-brightness and high-efficiency fiber-coupled module for fiber laser pump with advanced laser diode”, Proc. SPIE 10086, High-Power Diode Laser Technology XV, 1008606 (22 February 2017)　
  6. Yoshikazu Kaifuchi, Yuji Yamagata, Ryozaburo Nogawa, Rintaro Morohashi, Yumi Yamada, and Masayuki Yamaguchi “Ultimate high power operation of 9xx-nm single emitter broad stripe laser diodes”, Proc. SPIE 10086, High-Power Diode Laser Technology XV, 100860D (22 February 2017)　
  7. Kensuke Shima, Shinya Ikoma, Keisuke Uchiyama, Yuya Takubo, Masahiro Kashiwagi, and Daiichiro Tanaka “5-kW single stage all-fiber Yb-doped single-mode fiber laser for materials processing”, Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 105120C (26 February 2018)　
  8. Rintaro Morohashi, Yuji Yamagata, Yoshikazu Kaifuchi, Katsuhisa Tada, Ryozaburo Nogawa, Yumi Yamada, and Masayuki Yamaguchi “High polarization purity operation of 99% in 9xx-nm broad stripe laser diodes”, Proc. SPIE 10514, High-Power Diode Laser Technology XVI, 105140B (19 February 2018)　
  9. Yohei Kasai, Takuya Aizawa, and Daiichiro Tanaka “High-power fiber-coupled pump lasers for fiber lasers”, Proc. SPIE 10514, High-Power Diode Laser Technology XVI, 105140J (19 February 2018)　
  10. Y. Takubo, S. Ikoma, K. Uchiyama, H. Kusaka, Y. Umeda, and M. Kashiwagi “Dynamic analysis of materials processing with 5-kW single-mode fiber laser”, Proc. SPIE 10897, Fiber Lasers XVI: Technology and Systems, 1089712 (7 March 2019)　
  11. Yoshikazu Kaifuchi, Kyohei Yoshida, Yuji Yamagata, Ryozaburo Nogawa, Yumi Yamada, and Masayuki Yamaguchi “Enhanced power conversion efficiency in 900-nm range single emitter broad stripe laser diodes maintaining high power operability”, Proc. SPIE 10900, High-Power Diode Laser Technology XVII, 109000F (4 March 2019)　
  12. Y. Wang, R. Kitahara, W. Kiyoyama, Y. Shirakura, T. Kurihara, Y. Nakanish, T. Yamamoto, M. Nakayama, S. Ikoma, and K. Shima “8-kW single-stage all-fiber Yb-doped fiber laser with a BPP of 0.50 mm-mrad”, Proc. SPIE 11260, Fiber Lasers XVII: Technology and Systems, 1126022 (21 February 2020)　
  13. Yuji Yamagata, Yoshikazu Kaifuchi, Ryozaburo Nogawa, Kyohei Yoshida, Rintaro Morohashi, and Masayuki Yamaguchi “Highly efficient 9xx-nm band single emitter laser diodes optimized for high output power operation”, Proc. SPIE 11262, High-Power Diode Laser Technology XVIII, 1126203 (2 March 2020)　
  14. 高出力ファイバレーザにおける誘導ラマン散乱と耐反射性 (PDF)
  15. 光アイソレータ用単結晶TSLAG (PDF)
    16. Note for I to XIII : Copy right 2015-2020 Society of Photo Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited.
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