(19)
(11) EP 2 154 759 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 153(4) EPC

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
06.10.2010 Bulletin 2010/40

(43) Date of publication:
17.02.2010 Bulletin 2010/07

(21) Application number: 08752713.1

(22) Date of filing: 14.05.2008
(51) International Patent Classification (IPC): 
H01S 3/06(2006.01)
(86) International application number:
PCT/JP2008/058842
(87) International publication number:
WO 2008/143084 (27.11.2008 Gazette 2008/48)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

(30) Priority: 18.05.2007 JP 2007132755

(71) Applicant: FUJIKURA LTD.
Kohtoh-ku Tokyo 135-8512 (JP)

(72) Inventor:
  • KITABAYASHI, Tomoharu
    Sakura-shi Chiba 285-8550 (JP)

(74) Representative: Cabinet Plasseraud 
52, rue de la Victoire
75440 Paris Cedex 09
75440 Paris Cedex 09 (FR)

   


(54) FIBER LASER


(57) A fiber laser of an MOPA type includes an MO which is a laser oscillator for generating seed light, a PA which is a light amplifier connected to a rear stage of the MO, for amplifying and outputting laser light emitted from the MO, and a reflection device which is provided between the MO and the PA. According to the present invention, the MOPA type fiber laser can decrease the peak value of the pulse which is emitted toward the MO or the pump light source by self-oscillation or reflection, and makes it unlikely that the pump light source or the MO will be damaged.