Title:
OPTICAL AMPLIFIERS PROVIDING HIGH PEAK POWERS WITH HIGH ENERGY LEVELS
Document Type and Number:
WIPO Patent Application WO1997026688
Kind Code:
A3
Abstract:
Two approaches are provided for achieving an optical amplifier system capable of producing high peak power, high energy pulse outputs while suppressing scattering noise. The first approach relates to an optical amplifier system which has at least one laser diode pulsed or cw pumped double clad fiber amplifier utilized for receiving a high frequency modulated injected signal pulse of short duration from the laser diode, via the fiber core, for amplification by coupling pump light into the inner cladding of the fiber. The average signal power is sufficient to saturate the gain of the fiber so as to minimize significant onset and buildup of forward and backward scattering noise. The duty cycle of the injected signal source pulse is chosen to allow adequate gain recovery in the fiber amplifier between pulses. The second approach relates to a cascaded optical amplifier system having at least two optical amplifying stages with two pulsed pump sources provided and two amplifying media, the first of which receives the injection and at least one pump signal wherein the injection pulsed signal is amplified to a first power and energy level. The second amplifying medium, optically coupled to the first, amplifies the first level signal to a second level amplified, injection pulsed signal. The duty cycle of the injection pulsed optical signal is synchronized with the first and second pulsed pump signals with the first pulsed pump signal having a different duration in the duty cycle than the second pulsed pump signal. 00000
Inventors:
WAARTS ROBERT G
SANDERS STEVEN
WELCH DAVID F
SCIFRES DONALD R
SANDERS STEVEN
WELCH DAVID F
SCIFRES DONALD R
Application Number:
PCT/US1997/000306
Publication Date:
September 18, 1997
Filing Date:
January 10, 1997
Export Citation:
Assignee:
SDL INC (US)
International Classes:
H01S3/06; H01S3/067; H01S3/094; H01S3/0941; H01S3/10; H01S3/23; H01S3/131; (IPC1-7): H01S3/06
Foreign References:
| US5175643A | 1992-12-29 | |||
| US4136929A | 1979-01-30 | |||
| US5050949A | 1991-09-24 | |||
| US5232404A | 1993-08-03 |
Other References:
MINELLY J D ET AL: "FEMTOSECOND PULSE AMPLIFICATION IN CLADDING-PUMPED FIBERS", OPTICS LETTERS, vol. 20, no. 17, 1 September 1995 (1995-09-01), pages 1797 - 1799, XP000520902
DESTHIEUX B ET AL: "111 kW (0.5 mJ) pulse amplification at 1.5 mu m using a gated cascade of three erbium-doped fiber amplifiers", APPLIED PHYSICS LETTERS, 2 AUG. 1993, USA, vol. 63, no. 5, ISSN 0003-6951, pages 586 - 588, XP000388102
NILSSON J ET AL: "Modeling and optimization of low-repetition-rate high-energy pulse amplification in cw-pumped erbium-doped fiber amplifiers", OPTICS LETTERS, 15 DEC. 1993, USA, vol. 18, no. 24, ISSN 0146-9592, pages 2099 - 2101, XP002031680
KO K Y ET AL: "Transient analysis of erbium-doped fiber amplifiers", IEEE PHOTONICS TECHNOLOGY LETTERS, DEC. 1994, USA, vol. 6, no. 12, ISSN 1041-1135, pages 1436 - 1438, XP002031681
SWEETSER J ET AL: "Efficient high repetition rate synchronous amplification of a passively mode-locked femtosecond dye laser", APPLIED OPTICS, 20 AUG. 1993, USA, vol. 32, no. 24, ISSN 0003-6935, pages 4471 - 4479, XP000388171
ZHU LEI ET AL: "HIGH-REPETITION TUNABLE PICOSECOND DYE LASER PUMPED BY A COPPER BROMIDE LASER", IEEE JOURNAL OF QUANTUM ELECTRONICS, vol. 27, no. 2, 1 February 1991 (1991-02-01), pages 283 - 287, XP000202931
DESTHIEUX B ET AL: "111 kW (0.5 mJ) pulse amplification at 1.5 mu m using a gated cascade of three erbium-doped fiber amplifiers", APPLIED PHYSICS LETTERS, 2 AUG. 1993, USA, vol. 63, no. 5, ISSN 0003-6951, pages 586 - 588, XP000388102
NILSSON J ET AL: "Modeling and optimization of low-repetition-rate high-energy pulse amplification in cw-pumped erbium-doped fiber amplifiers", OPTICS LETTERS, 15 DEC. 1993, USA, vol. 18, no. 24, ISSN 0146-9592, pages 2099 - 2101, XP002031680
KO K Y ET AL: "Transient analysis of erbium-doped fiber amplifiers", IEEE PHOTONICS TECHNOLOGY LETTERS, DEC. 1994, USA, vol. 6, no. 12, ISSN 1041-1135, pages 1436 - 1438, XP002031681
SWEETSER J ET AL: "Efficient high repetition rate synchronous amplification of a passively mode-locked femtosecond dye laser", APPLIED OPTICS, 20 AUG. 1993, USA, vol. 32, no. 24, ISSN 0003-6935, pages 4471 - 4479, XP000388171
ZHU LEI ET AL: "HIGH-REPETITION TUNABLE PICOSECOND DYE LASER PUMPED BY A COPPER BROMIDE LASER", IEEE JOURNAL OF QUANTUM ELECTRONICS, vol. 27, no. 2, 1 February 1991 (1991-02-01), pages 283 - 287, XP000202931
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