Micromachining with a High Repetition Rate Femtosecond Fiber Laser

Yoshino, Fumiyo; Shah, Lawrence; Fermann, M. E.; Arai, Alan; Uehara, Yuzuru

doi:10.2961/jlmn.2008.03.0006

Cited by 11 publications

(5 citation statements)

References 14 publications

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“…This limits application of bulk solid-state lasers in the fields where high processing speed over the large area parts is required. In contrast, fiber lasers offer functionality, simplicity, durability, high efficiency, compactness, and a relatively modest price 3 . Therefore, there is strong industrial demand for high-power picosecond fiber lasers with output performance comparable to bulk solid-state lasers, which enable to operate in a wide range of repetition rates.…”

Section: Introductionmentioning

confidence: 99%

Picosecond Yb-doped tapered fiber laser system with 1.26 MW peak power and 200 W average output power

Petrov

Odnoblyudov

Gumenyuk

et al. 2020

Sci Rep

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We demonstrate a compact picosecond master-oscillator power-amplifier (MOPA) system based on an Yb-doped polarization-maintaining double-clad tapered fiber (T-DCF) delivering pulses with over 1.26 MW peak power and average output power up to 200 W preserving near diffraction limited beam quality. The unique properties of an active tapered fiber enable to amplify the seed pulses directly with no need for applying of additional stretching technique. This simplified laser system can find the practical implementation in industrial micromachining.

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Section: Introductionmentioning

confidence: 99%

Picosecond Yb-doped tapered fiber laser system with 1.26 MW peak power and 200 W average output power

Petrov

Odnoblyudov

Gumenyuk

et al. 2020

Sci Rep

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“…Furthermore, the processing time was identically. For the high-fluence regime, a volume ablation rate of 2.05 mm 3 /min was achieved. However, in the low-fluence regime an increase of the ablation rate of 2.58 mm 3 /min was obtained corresponding to a growth of 25%.…”

Section: Resultsmentioning

confidence: 99%

“…Initial studies in this field are focused on microvias generation, 1 microhole processing in steel and copper foils, 2 refractive index changes in transparent materials, 3 and laser ablation of microcavities. 4,5 In addition, the potential of the technology has been already demonstrated by means of specific machining examples, such as micropyramids and embossing tools.…”

Section: Introductionmentioning

confidence: 99%

High-rate laser microprocessing using a polygon scanner system

Loeschner

Schille

Streek

et al. 2015

Journal of Laser Applications

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This paper discusses results obtained in high-rate laser microprocessing by using a high average power high-pulse repetition frequency ultrashort pulse laser source in combination with an in-house developed polygon scanner system. With the recent development of ultrashort pulse laser systems supplying high average power of hundreds watts and megahertz pulse repetition rates, a significant increase of the productivity can potentially be achieved in micromachining. This permits upscaling of the ablation rates and large-area processing, gaining increased interest of the ultrashort pulse laser technology for a large variety of industrial processes. However, effective implementation of high average power lasers in microprocessing requires fast deflection of the laser beam. For this, high-rate laser processing by using polygon scanner systems provide a sustainable technological solution. In this study, a picosecond laser system with a maximum average power of 100 W and a repetition rate up to 20 MHz was used. In raster scanning using the polygon scanner, the laser beam with a focus spot diameter of 44 μm was deflected with scan speeds of several hundred meters per second. The two-dimensional scanning capability of the polygon scanner supplied a scan field of 325 × 325 mm. The investigations were focused on high-rate large-area laser ablation of technical grade stainless steel as well as selective thin film ablation from bulk substrates. By variation of the processing parameters laser fluence, as well as temporal and spatial pulse-to-pulse distance, their impact onto the ablation process was evaluated with respect to the ablation rate, processing rate, surface quality, and ablation efficiency.

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“…Passively mode-locked fiber lasers have been recognized as a reliable and practical source generating femtosecond optical pulses, due to their alignment-free operation, efficient heat dissipation, compactness, and low cost. They have been actively used for a number of applications ranging from frequency comb spectroscopy [1] through micro-machining [2] to multiphoton microscopy [3]. For long-term stability and turn-key operation of mode-locked fiber lasers, the implementation of real saturable absorbers inside the oscillator is highly desirable.…”

Section: Introductionmentioning

confidence: 99%

“…Evanescent-field-interaction structure has recently attracted great interest due to their much reduced thermal damage problems compared to ferrule-type [8,9,14] or mirror-type [5] SA structures. For example, fiber lasers mode-locked by side-polished fiberbased CNT-SA devices could achieve >34 nJ intra-cavity pulse energy with damage threshold of 97 mJ/cm 2 [13], which is 30 dB higher than that of ferrule-type CNT-SA device reported in [14]. Evanescent-field-intereacting SAs have been implemented by coating the SA films on specially fabricated fibers (such as side-polished fibers [6] and tapered fibers [7]) or on waveguide devices [15,16].…”

Section: Introductionmentioning

confidence: 99%

300-MHz-repetition-rate, all-fiber, femtosecond laser mode-locked by planar lightwave circuit-based saturable absorber

Kim¹,

Kim²,

Cheong³

et al. 2015

Opt. Express

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We show the implementation of fiber-pigtailed, evanescent-field-interacting, single-walled carbon nanotube (CNT)-based saturable absorbers (SAs) using standard planar lightwave circuit (PLC) fabrication processes. The implemented PLC-CNT-SA device is employed to realize self-starting, high-repetition-rate, all-fiber ring oscillators at telecommunication wavelength. We demonstrate all-fiber Er ring lasers operating at 303-MHz (soliton regime) and 274-MHz (stretched-pulse regime) repetition-rates. The 303-MHz (274-MHz) laser centered at 1555 nm (1550 nm) provides 7.5 nm (19 nm) spectral bandwidth. After extra-cavity amplilfication, the amplified pulse train of the 303-MHz (274-MHz) laser delivers 209 fs (178 fs) pulses. To our knowledge, this corresponds to the highest repetition-rates achieved for femtosecond lasers employing evanescent-field-interacting SAs. The demonstrated SA fabrication method, which is based on well-established PLC processes, also shows a potential way for mass-producible and lower-cost waveguide-type SA devices suitable for all-fiber and waveguide lasers.

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Micromachining with a High Repetition Rate Femtosecond Fiber Laser

Cited by 11 publications

References 14 publications

Picosecond Yb-doped tapered fiber laser system with 1.26 MW peak power and 200 W average output power

Picosecond Yb-doped tapered fiber laser system with 1.26 MW peak power and 200 W average output power

High-rate laser microprocessing using a polygon scanner system

300-MHz-repetition-rate, all-fiber, femtosecond laser mode-locked by planar lightwave circuit-based saturable absorber

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