20W single-frequency fiber laser operating at 1.93 um

Gapontsev, D.V.; Platonov, N.S.; Meleshkevich, M.; Mishechkin, Oleg V.; Shkurikhin, O.; Agger, Søren; Varming, Poul; Poylsen, J.H.

doi:10.1109/cleo.2007.4452392

Cited by 7 publications

(6 citation statements)

References 3 publications

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“…Meanwhile, monolithic fiber lasers based on all-fiber configuration possess the advantages of being more stable and practical, so it is really attractive to investigate and develop single frequency fiber lasers near 2 µm employing monolithic fiber configuration [20] . An admirable previous work has been done by Gapontsev et al, who demonstrated a 20 W monolithic single frequency fiber amplifier at 1.93 µm in 2007 [18] .In this paper, we demonstrate a monolithic single frequency fiber amplifier at 1.97 µm based on master oscillator stimulated Brillouin scattering (SBS) effect observed in the amplifier, which means the output power can be improved further if the pump power is increased.In the MOPA system, the single frequency seed fiber laser based on ultrashort cavity [16] operates at 1.97 µm and has an output power of 35 mW, and the linewidth is less than 100 kHz. Figure 1 shows the two-stage Tm-doped fiber preamplifier.…”

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confidence: 78%

“…In recent years, 2 µm single frequency fiber lasers have undergone rapid development [11][12][13][14][15][16][17][18][19][20][21][22] since fiber lasers have outstanding advantages including high efficiency, considerable compactness, convenience for thermal management, high beam quality and excellent stability. To realize single frequency fiber laser near 2 µm, distributed Bragg reflector (DBR) [15] and distributed-feedback (DFB) [12,19] techniques have been employed, the output power is limited and should be further amplified for practical applications.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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51.5 W monolithic single frequency 1.97 m Tm-doped fiber amplifier

Wang¹,

Zhang²,

Wang³

et al. 2013

High Pow Laser Sci Eng

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We demonstrate a monolithic single frequency Tm-doped fiber amplifier with output power of 51.5 W. A single frequency fiber laser at 1.97 µm is amplified by a cascaded master oscillator power amplifier (MOPA) system with all-fiber configuration. The optical-to-optical conversion efficiency of the main fiber amplifier is 45%. No amplified spontaneous emission (ASE) or stimulated Brillouin scattering (SBS) effect is observed in the fiber amplifier. The output power could be further scaled by launching more pump power. Keywords:Single .frequency .lasers near .2 µm, which play a significant role in many applications such as coherent LIDAR, coherent beam combining, nonlinear frequency conversion, medicine, atmospheric sensing and spectroscopy, have attracted intense interest and have been widely investigated [1][2][3][4][5][6][7][8][9][10][11][12] . In recent years, 2 µm single frequency fiber lasers have undergone rapid development [11][12][13][14][15][16][17][18][19][20][21][22] since fiber lasers have outstanding advantages including high efficiency, considerable compactness, convenience for thermal management, high beam quality and excellent stability. To realize single frequency fiber laser near 2 µm, distributed Bragg reflector (DBR) [15] and distributed-feedback (DFB) [12,19] techniques have been employed, the output power is limited and should be further amplified for practical applications. At present, most of the reported high power single frequency fiber lasers near 2 µm are achieved based on bulk configuration [3,4] . Meanwhile, monolithic fiber lasers based on all-fiber configuration possess the advantages of being more stable and practical, so it is really attractive to investigate and develop single frequency fiber lasers near 2 µm employing monolithic fiber configuration [20] . An admirable previous work has been done by Gapontsev et al., who demonstrated a 20 W monolithic single frequency fiber amplifier at 1.93 µm in 2007 [18] .In this paper, we demonstrate a monolithic single frequency fiber amplifier at 1.97 µm based on master oscillator stimulated Brillouin scattering (SBS) effect observed in the amplifier, which means the output power can be improved further if the pump power is increased.In the MOPA system, the single frequency seed fiber laser based on ultrashort cavity [16] operates at 1.97 µm and has an output power of 35 mW, and the linewidth is less than 100 kHz. Figure 1 shows the two-stage Tm-doped fiber preamplifier. The first stage of the pre-amplifier consists of a 1550 nm pump laser, a 1550/2000 wavelength division multiplexer (WDM), an isolator (ISO) and a piece of 2.5 m long single cladding Tm-doped fiber (NA is 0.15) with core diameter of 9 µm and cladding diameter of 125 µm. The second stage of the pre-amplifier employs a (2 + 1) × 1 signal-pump combiner and two 793 nm laser diodes (LDs). The amplified 2 µm laser signal was injected into a piece of 8 m long double cladding Tm-doped fiber (DC-TDF) with core diameter of 10 µm and inner cladding diameter of 125 µm. The Tm-do...

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confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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51.5 W monolithic single frequency 1.97 m Tm-doped fiber amplifier

Wang¹,

Zhang²,

Wang³

et al. 2013

High Pow Laser Sci Eng

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“…Among various possible combinations, we chose 1907nm from a thulium-doped fiber source and 1540nm from an erbiumdoped fiber source. These fiber sources are readily scalable in single frequency beyond tens of watts [3,4]. The 852nm can be efficiently generated by doubly-resonant sum-frequency mixing (DRSFM) in an external resonator, in which both the 1907nm and 1540nm are resonantly enhanced simultaneously [5].…”

Section: Introductionmentioning

confidence: 99%

High-power, continuous-wave, scalable, single-frequency 852nm laser source for 213nm generation

Kaneda

Tago²,

Sasa³

et al. 2019

Nonlinear Frequency Generation and Conversion: Materials and Devices XVIII

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We developed a high-power, continuous-wave (CW), single-frequency 852nm laser source, for the purpose of fourth harmonic generation at 213nm. Our approach is the doubly resonant sum-frequency mixing (DRSFM) with two fiber sources. An in-house single-frequency master oscillator at 1907nm is amplified by an in-house clad-pumped amplifier to 5W, and a commercial single-frequency master oscillator at 1540nm is amplified by a commercial amplifier to 10W. The two beams are combined via a dichroic mirror to a single beam before incident on a dual-wavelength resonator, consisting of one set of dual-wavelength mirrors. The external resonator is locked to the 1907nm laser frequency, and the frequency of the 1540nm is locked to the resonator, realizing double-resonance. With a periodically-poled stoichiometric lithium tantalate in the resonator, the sum-frequency at 852nm is efficiently generated. All 3 waves are in the same polarization (e-ray), allowing the effective use of Brewster-cut device, eliminating reflection loss for all wavelengths without any antireflection coatings. With 4.6W at 1907nm and 7.7W at 1540nm incident onto the resonator, 5.2W at 852nm was generated, representing the efficiency of greater than 40%. The experimental result indicates our current setup will be more efficient with higher input powers at 1907nm. With both fiber sources at 1540nm and 1907nm being scalable in output power, the output at 852nm is also scalable. By the forth harmonic of 852nm, 0.456 W CW 213nm was generated.

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“…One promising route to the required output characteristics is via the use of master-oscillator power-amplifier (MOPA) configuration based on Tm-doped silica fiber as the gain medium. In recent work reported in [1], the output from a single-frequency, Tmdoped distributed-feedback (DFB) fiber laser operating at 1932 nm was amplified to 20 W using two Tm-doped fiber amplification stages pumped by Er,Yb cop-doped fiber lasers at 1567 nm. In this paper, we report on a singlefrequency Tm-doped fiber MOPA with 100 W of single-frequency output at 1943 nm in a linearly-polarised beam with M 2 ≈ 1.25.…”

Section: Introductionmentioning

confidence: 99%