LASER DEVICE

WIPO Patent Application WO/2008/029859

A1

A laser device (300) comprising a DFB fiber laser (40) having as an amplifying medium a rare earth added silica-based optical fiber containing aluminum codoped at high concentration, an optical feedback path (50) formed by a ring-form optical fiber, and an optical coupler (70) for feeding back part of an output from the DFB fiber laser (40) to the DFB fiber laser (40) via the optical feedback path (50) and outputting the other part of the DFB fiber laser (40) to the outside, wherein the optical fiber forming the optical feedback path (50) is longer than a length provided by relaxed oscillation noise having -110dB/Hz in an output to the outside.

WO/2013/061708	MODE-LOCKED LASER LIGHT SOURCE DEVICE AND OPTICAL COHERENCE TOMOGRAPHY APPARATUS USING SAME
WO/2001/035055	SACRIFICIAL CATHODE ON A RING LASER GYRO BLOCK

NAKAZAWA MASATAKA (JP)
SUZUKI AKIHITO (JP)
HIROOKA TOSHIHIKO (JP)
YOSHIDA MASATO (JP)
SHIOTA KAZUNORI (JP)

PCT/JP2007/067341

March 13, 2008

September 05, 2007

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ADVANTEST CORP (JP)
NAKAZAWA MASATAKA (JP)
SUZUKI AKIHITO (JP)
HIROOKA TOSHIHIKO (JP)
YOSHIDA MASATO (JP)
SHIOTA KAZUNORI (JP)

H01S3/083; H01S3/06; H01S3/10; H01S3/137; H01S3/23

US6272165B1

2001-08-07

SUZUKI A. ET AL.: "A Ultralow Noise and Narrow Linewidth lambda/4-Shifted DFB Er-Doped Fiber Laser With a Ring Cavity Configuration", PHOTONICS TECHNOLOGY LETTERS, IEEE, vol. 19, no. 19, 1 October 2007 (2007-10-01), pages 1463 - 1465, XP011191690
NAKAZAWA M., YOSHIDA E., TAMURA K.: "10 GHz, 2ps regeneratively and harmonically FM mode-locked erbium fibre ring laser", ELECTRONICS LETTERS, IEEE, vol. 32, no. 14, 4 July 1996 (1996-07-04), pages 1285 - 1287, XP000624423

RYUKA, Akihiro (22-1 Nishi-Shinjuku,6-chome, Shinjuku-ku, Tokyo 05, JP)

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