Global Patent Index - EP 1733460 A4

EP 1733460 A4 20090415 - METHOD AND APPARATUS FOR PROVIDING LIGHT HAVING A SELECTED POLARIZATION WITH AN OPTICAL FIBER

Title (en)

METHOD AND APPARATUS FOR PROVIDING LIGHT HAVING A SELECTED POLARIZATION WITH AN OPTICAL FIBER

Title (de)

VERFAHREN UND VORRICHTUNG ZUR BEREITSTELLUNG VON LICHT MIT SELEKTIVER POLARISATION MIT EINER OPTISCHEN FASER

Title (fr)

PROCEDE ET APPAREIL PERMETTANT D'OBTENIR UNE LUMIERE POSSEDANT UNE POLARISATION SELECTIONNEE AVEC UNE FIBRE OPTIQUE

Publication

EP 1733460 A4 20090415 (EN)

Application

EP 05712370 A 20050131

Priority

  • US 2005002908 W 20050131
  • US 54079904 P 20040130

Abstract (en)

[origin: WO2005074573A2] Optical apparatus (110, 500, 600, 800, 1000) for providing light having a selected linear polarization having a polarization ratio, the apparatus (110, 500, 600, 800, 1000) comprising a length of optical fiber (120, 504, 604, 804, 1001) comprising a rare earth for providing light having a first wavelength responsive to receiving pump light having a second wavelength that is different than said first wavelength, wherein if the length of optical fiber (120, 504, 604, 804, 1004) were placed in a first position between the length of fiber (120, 504, 604, 804, 1004) is substantially linearly oriented (20) the fiber (120, 504, 604, 804, 1004) could propagate at the first wavelength a fundamental mode and a plurality of higher order modes and the apparatus (110, 500, 600, 800, 1000) could provide light having a first polarization ratio for the selected linear polarization and an M<2> parameter, and wherein the length of fiber (120, 504, 604, 804, 1004) is positioned in a second position that increases the bend loss of the fiber relative to the first position such that, responsive to the increased bend loss, the apparatus (110, 500, 600, 800, 1000) can provide light having a reduced M<2> parameter as well as a second polarization ratio for the selected polarization that is increased relative to the first polarization ratio, the increase being at least 6 dB greater than the first polarization ratio, and wherein when the length of fiber (120, 504, 604, 804, 1004) is in the second position the apparatus (110, 500, 600, 800, 1000) can provide a slope efficiency that is at least 50 % of the ratio of the second wavelength to the first wavelength.

IPC 8 full level

H01S 3/067 (2006.01); H01S 3/08 (2006.01)

CPC (source: EP)

G02B 6/105 (2013.01); H01S 3/0675 (2013.01); H01S 3/08045 (2013.01); H01S 3/06712 (2013.01); H01S 3/06729 (2013.01); H01S 3/09415 (2013.01); H01S 3/1067 (2013.01); H01S 3/1618 (2013.01)

Citation (search report)

  • [XY] WO 0169313 A1 20010920 - US GOV SEC NAVY [US]
  • [PX] MANYAM U H ET AL.: "Laser fibers designed for single polarization output", ADVANCED SOLID-STATE PHOTONICS, PROCEEDINGS VOLUME, vol. 94, 1 February 2004 (2004-02-01), pages 118 - 122, XP009113327
  • [XY] KOPLOW J P ET AL: "SINGLE-MODE OPERATION OF A COILED MULTIMODE FIBER AMPLIFIER", OPTICS LETTERS, OSA, OPTICAL SOCIETY OF AMERICA, WASHINGTON, DC, US, vol. 25, no. 7, 1 April 2000 (2000-04-01), pages 442 - 444, XP000950350, ISSN: 0146-9592
  • [XY] WEBSLS P ET AL: "Highly sensitive beam quality measurements on large-mode-area fiber amplifiers", OPTICS EXPRESS, OPTICAL SOCIETY OF AMERICA, WASHINGTON, DC, US, vol. 11, no. 25, 15 December 2003 (2003-12-15), pages 3346 - 3351, XP009113331, ISSN: 1094-4087
  • [Y] TANKALA K ET AL: "PM double-clad fibers for high-power lasers and amplifiers", PROCEEDINGS OF THE SPIE, SPIE, BELLINGHAM, VA; US, vol. 4974, 1 January 2003 (2003-01-01), pages 220 - 229, XP002339906, ISSN: 0277-786X
  • See references of WO 2005074573A2

Citation (examination)

WESZELS P ET AL: "Narrow-linewidth master oscillator fiber power amplifier system with very low amplified spontaneous emission", OPTICS COMMUNICATIONS, NORTH-HOLLAND PUBLISHING CO. AMSTERDAM, NL, vol. 205, no. 1-3, 15 April 2002 (2002-04-15), pages 215 - 219, XP004352144, ISSN: 0030-4018, DOI: 10.1016/S0030-4018(02)01372-X

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR

DOCDB simple family (publication)

WO 2005074573 A2 20050818; WO 2005074573 A3 20061026; EP 1733460 A2 20061220; EP 1733460 A4 20090415

DOCDB simple family (application)

US 2005002908 W 20050131; EP 05712370 A 20050131