Multistage Yb-doped fiber amplifier generating megawatt peak-power, subnanosecond pulses

Teodoro, Fabio Di; Brooks, Christopher D.

doi:10.1364/ol.30.003299

Cited by 49 publications

(16 citation statements)

References 5 publications

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“…This is the maximum reported peak power achieved out of PM, rod-like PCF to date to the authors' knowledge, and is on the scale of the highest peak powers reported out of a non-PM rod-like PCF. 3,4 When configured to operate at 500kHz, the pulses were stretched to approximately 60ps in PM980. An average power of 25.6W was attained, and a pulse width of 37.5ps was measured out of the amplifier, corresponding to a peak power of 1.4MW and a pulse energy of 51μJ.…”

Section: Resultsmentioning

confidence: 99%

High-peak-power short-pulse fiber laser for materials processing

2009

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High-speed, high-resolution materials processing strongly benefits from optical sources that deliver high peak power in short, high-repetition-rate pulses of excellent beam quality. These sources are also of interest for achieving high average power at nonlinearly-generated wavelengths. Until recently, high peak power, high-repetition-rate pulses have only been available from solid-state lasers. Fiber lasers and amplifiers offer significant advantages over solid-state lasers in terms of size and wall-plug efficiency. This paper presents a fiber-based master-oscillator/power-amplifier (MOPA) source at 1064nm featuring 84-µm-core, polarization-maintaining Yb-doped photonic crystal fiber that generates ~20ps -100ps pulses at variable pulse repetition frequencies (PRFs), from 10kHz to 100MHz. The flexibility in pulse format allows the source to be tailored to the application. Where peak power is critical, the PRF is reduced to achieve maximum peak power. Where average power is needed, the PRF is increased to achieve high average power. Peak powers of ~4MW have been achieved at reduced PRF (100kHz), and average powers greater than 172W have been demonstrated at high PRF (100MHz) in a linearly-polarized output beam.

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Section: Resultsmentioning

confidence: 99%

High-peak-power short-pulse fiber laser for materials processing

2009

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“…Recent studies have shown ytterbium-doped fiber operating at high 3 average power with picosecond pulses [13] and high peak power at subnanosecond pulses [14] .…”

Section: Motivationmentioning

confidence: 99%

Sub-Nanosecond Infrared Optical Parametric Pulse Generation in Periodically Poled Lithium Niobate Pumped by a Seeded Fiber Amplifier

Cocuzzi¹

2008

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information , 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YY)2. REPORT TYPE 3. DATES COVERED (From -To) AFRL-RY-WP-TR-2008-1033 SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSORING/MONITORING AGENCY ACRONYM(S)AFRL SPONSORING/MONITORING AGENCY REPORT NUMBER(S) AFRL-RY-WP-TR-2008-1033 DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution unlimited. SUPPLEMENTARY NOTESReport contains color. This is the author's Master's thesis through the University of Dayton's Electro-Optics program. PAO Case Number: WPAFB 07-0643, 05 Dec 2007. ABSTRACTA ytterbium-doped, polarization maintaining PM double-clad fiber was seeded at one end and pumped at the other end, using dichroic filters to protect the pump and seed lasers, creating a fiber amplifier. The seed laser was a passively Q-switched Nd:YAG microchip laser operating at 1064 nm, polarized 99:1, 7.14 kHz repetition rare, 0.5 nsec pulse width, average power of 38 mW, and 5.3 µJ pulse energy. The pump laser was a 915 nm diode laser coupled to a fiber pigtail, operating at a maximum of 6 W with 7 A of operating current. The 3.56-m-long FC connectorized fiber was the active element and had a 25 µm core diameter and a 248 µm inner cladding diameter with 400-µm-diameter spliced silica end-caps to prevent damage polished at 8° to prevent back reflections. The PPLN crystal was an uncoated 1 x 14 x 49-mm-long multigrating crystal with approximate parallelism of the front and back surfaces. The domain grating period used was 29.5 µm, converting the 720 mW (over 100 µJ pulse energy) fiber amplifier beam to a 1.507 µm signal beam and a 3.619 µm idler beam, with 24% of the pump energy going to the signal and idler outputs. In this experiment, a ytterbium-doped fiber was seeded at one end and pumped at the other end, using high-performance dichroic filters to protect both the pump and the seed lasers, thus creating a fiber amplifier. The seed laser was a passively Q-Switched Nd:YAG microchip laser operating at 1064 nm, polarized 99:1, 7.14-kHz repetition rate, 0.5-nsec pulse width, average power of 38 mW, and 5.3 μJ pulse energy. The fiber amplifier was pumped at 915 nm using a diode l...

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“…Yb-doped fiber laser systems generating pulses with multi-MW peak power, energy of several millijoule in both oscillator [1] and amplifier [2][3][4] configuration have been demonstrated these last 5 years. However, all these impressive performances were based on a quasi-four-level laser operation in the 1020 nm -1100 nm spectral range.…”

Section: Introductionmentioning

confidence: 99%

Yb-doped fiber laser system generating 12-ns 0.7-mJ pulses at 82 kHz at 977 nm

et al. 2010

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We demonstrate an Ytterbium-doped fiber laser system generating high energy pulses at the non-conventional wavelength of 977 nm. An actively Q-switched master fiber oscillator delivers 1.2 W of average power in 12 ns pulses at 82 kHz of repetition rate. This pulsed fiber source is then amplified in an ultra-large core photonic crystal fiber amplifier up to 71 W. Deducing the fraction of power contained in interpulse ASE, we obtained 0.7 mJ pulses at 977 nm, resulting in a pulse peak-power of >55 kW. To the best to our knowledge, this system delivers the highest performances ever demonstrated in this spectral window.

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Multistage Yb-doped fiber amplifier generating megawatt peak-power, subnanosecond pulses

Cited by 49 publications

References 5 publications

High-peak-power short-pulse fiber laser for materials processing

High-peak-power short-pulse fiber laser for materials processing

Sub-Nanosecond Infrared Optical Parametric Pulse Generation in Periodically Poled Lithium Niobate Pumped by a Seeded Fiber Amplifier

Yb-doped fiber laser system generating 12-ns 0.7-mJ pulses at 82 kHz at 977 nm

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