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Volume 29, Issue 2
Displaying 1-11 of 11 articles from this issue
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Kozo YASUDA2001 Volume 29 Issue 2 Pages 77
Published: February 15, 2001
Released on J-STAGE: March 17, 2010
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Kenichi UEDA2001 Volume 29 Issue 2 Pages 78
Published: February 15, 2001
Released on J-STAGE: March 17, 2010
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Kenichi UEDA2001 Volume 29 Issue 2 Pages 79-83
Published: February 15, 2001
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSDouble clad fiber lasers open the new world of high power lasers for industrial applications with high beamquality power delivering. The physics in the absorption process of double clad fiber is described related to thespatial hole burning effect. The homogeneous absorption is essential to achieve high saturation power. Thebasic physics of fiber lasers is described in a manner of general physics of lasers. A fiber-embedded disk in aside pumping scheme is proposed from the basic principle. The fiber disk laser is promising for the kW outputfrom a single fiber with multimode core. A photonic fiber is introduced as a future model of high power andhigh performance fiber lasers.View full abstractDownload PDF (1052K) -
Norihiko NISHIZAWA, Toshio GOTO2001 Volume 29 Issue 2 Pages 84-89
Published: February 15, 2001
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSCompact system of wavelength tunable ultrashort soliton pulse generation has been demonstratedusing modelockedfemtosecond fiber laser and polarization maintaining (PM) fiber. The wavelengths of generated pulsescan be changed continuously by merely varying fiber input power. The generated pulses are almost transformlimited ideal soliton pulses. Two-colored soliton pulses can be generated simultaneously usingthe birefringenceof PM fibers. Using the dispersion shifted PM fibers, in addition to the soliton pulse, the anti-stokespulse is generated at the shorter wavelength side. Using the diameter reduced PM fibers and dispersion shiftedPM fibers, the wavelength tunable ultrashort pulses can be generated in the wide wavelength region of 1.3-2.0μm. In this paper, the characteristics of wavelength tunable soliton pulse are described withthe principles and applications.View full abstractDownload PDF (993K) -
2001 Volume 29 Issue 2 Pages 89
Published: February 15, 2001
Released on J-STAGE: March 17, 2010
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Mahendra PRABHU, Nam Seong KIM, Lu JIANREN, Jianqiu XU, Kenichi UEDA2001 Volume 29 Issue 2 Pages 90-93
Published: February 15, 2001
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSUsing Brillouin/Raman fiber laser (BRFL), we obtain an ultra-broadband (1433-1533nm) CW supercontinuum (SC) centered at 1484nm with maximum average output power of 1.87W and a nonlinear conversionefficiency of 81%. Spectral density of 18.4mW/nm is obtained. The BRFL consists of a Raman cavity withphosphosilicate fiber (PDF) and pairs of fiber Bragg grating (FBG) mirrors and a Brillouin cavity with the PDFand single-mode fiber (SMF), and feedback FBG mirror. With an 8.4W/1064nm Yb-doped double-clad fiberlaser (DCFL) as a pump and a 50% feedback FBG mirror at the end of the BRFL, an output power of over 1.7Wwith 100nm bandwidth centered at 1484nm and weak 0.11nm spectral modulation were observed. The outputcharacteristics of the SC for different PDF and SMF lengths in the Raman and Brillouin cavity are reported.View full abstractDownload PDF (656K) -
Tomoko OHTSUKI2001 Volume 29 Issue 2 Pages 94-98
Published: February 15, 2001
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSFiber amplifier technology has recently made remarkable progress in telecommunication applications, enablingdevelopment of a variety of fiber lasers and amplifiers. A new type of ultraviolet laser sources based onthe efficient nonlinear frequency conversion from fiber amplifiers has been demonstrated. Ultraviolet lasersources are essential for high-resolution measurement and testing, and these sources have advantages in termsof compactness and robustness. This paper reviews the recent developments of these UV sources including thetechnical issues involved in making high peak power fiber lasers and amplifiers which enable efficient frequencyconversion.View full abstractDownload PDF (866K) -
Satoshi MAKIO, Masayoshi SATO, Takatomo SASAKI2001 Volume 29 Issue 2 Pages 99-103
Published: February 15, 2001
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSWe report a new method to reduce the output power noise of an intracavity second harmonic generation (SHG) laser at 430 nm. LiB3O5 (LBO) nonlinear crystal was inserted into the cavity of a laser diode (LD) -pumped Crdoped LiSrAlF6 (Cr: LiSAF) laser for blue light generation. The maximum SHG output power was 38mW, asgenerated from the oscillation of the fundamental wave in a multi-longitudinal mode. High output stabilitywas observed at an output power of 30.5mW±1% for more than 10hours. We investigated the standingwave condition at the fundamental laser wavelength by calculating the intensity distribution inside the cavityresonator. The laser crystal was arranged at a proper position inside the cavity so that each standing waveremained in the multi-mode and did not fall into competition, and a low-noise blue light output was obtainedin the multi-mode.View full abstractDownload PDF (824K) -
Jun IZAWA, Hayato NAKAJIMA, Hiroshi HARA, Yoshinori ARIMOTO2001 Volume 29 Issue 2 Pages 104-108
Published: February 15, 2001
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSWe studied the lasing performance of a Tm, Ho: YLF laser using single-and double-cavity configurations. Thedouble-cavity configuration provided 30mW in single-mode oscillation, which exceeded that with the singlecavity configuration. Furthermore, we obtained a tunable range of 15GHz when using the double-cavity configuration at room temperature. In addition, we compared the lasing performance of single-mode oscillationusing internal mirrors with differing reflectivities.View full abstractDownload PDF (824K) -
Hidetsugu YOSHIDA, Akinori OHKUBO, Hisanori FUJITA, Masahiro NAKATSUKA2001 Volume 29 Issue 2 Pages 109-114
Published: February 15, 2001
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSWe designed and demonstrated two new schemes to improve the performance of stimulated Brillouin scattering (SBS) cells for a high average power laser. By introducing a lamellar flow cell, thermallyinducedefocusingand convection via laser light absorption were removed. By inserting a rotational wedge plate, the spot wasrotated in time and locate heat sources were diffused. As a result, the SBS reflectivity and fidelity wereimproved dramatically with acetone. Using the cell, the operational power can be improved by as much asseveral hundred times the closed-type. If a medium with a small absorption coefficient such asheavy fluorocarbonsis used, the phase conjugate performance enables the incident power to reach a kW level.View full abstractDownload PDF (1107K) -
Yoichi FUJII2001 Volume 29 Issue 2 Pages 115-120
Published: February 15, 2001
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSDownload PDF (1034K)
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