Internal resonantly enhanced frequency doubling of continuous-wave fiber lasers

Cieslak, R.; Clarkson, W.A.

doi:10.1364/ol.36.001896

Cited by 22 publications

(13 citation statements)

References 6 publications

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“…The laser radiation spectrum is narrowed down by the prism to 0.5 nm, which is within the spectral width of the non-linear crystal phase matching, equal to 1.8 nm. In analogy to [14], the fibre laser operates in those longitudinal modes of the fibre laser cavity, which are also resonant for the enhancement cavity. To fulfil this condition, it is sufficient for the fibre laser resonator to be much longer than the enhancement cavity.…”

Section: Experimental Set-up and Resultsmentioning

confidence: 99%

“…The essential difference of the proposed configuration from the one described in [14] is that no fundamental radiation must be coupled out of the enhancement cavity in order to provide feed-back. When this is necessary (as it is in [14]), two mirrors of the enhancement cavity cannot be totally reflective, thus reducing finesse of the cavity in the configuration "resonator within resonator".…”

Section: Experimental Set-up and Resultsmentioning

confidence: 99%

“…When this is necessary (as it is in [14]), two mirrors of the enhancement cavity cannot be totally reflective, thus reducing finesse of the cavity in the configuration "resonator within resonator".…”

Section: Experimental Set-up and Resultsmentioning

confidence: 99%

“…In [13], the enhancement cavity was external to the resonator of the fibre laser ( Fig. 1(a)), while in [14] it was inside and effectively acted as a "resonator within resonator" (Fig. 1(b)).…”

Section: Introductionmentioning

confidence: 99%

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Variable-wavelength second harmonic generation of CW Yb-fibre laser in partially coupled enhancement cavity

et al. 2014

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This work for the first time proposes and studies a method of frequency doubling of CW non-single-frequency fibre lasers with a high-Q resonator partially coupled to the fibre laser cavity. The proposed new approach resulted in the following parameters: laser's maximal output power 880 mW at 536 nm when pumped with 6.2 W at 976 nm, wavelength tuneability range 521-545 nm with the output power at the extreme ends of this range 420 and 220 mW correspondingly. The proposed configuration allows efficient non-linear transformation of both CW and pulsed radiation in a partially coupled enhancement cavity.

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Section: Experimental Set-up and Resultsmentioning

confidence: 99%

Section: Experimental Set-up and Resultsmentioning

confidence: 99%

Section: Experimental Set-up and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Variable-wavelength second harmonic generation of CW Yb-fibre laser in partially coupled enhancement cavity

et al. 2014

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“…Normal intracavity frequency doubling is not efficient for fiber lasers due to the limited intracavity power enhancement. A novel method of SHG in an enhancement resonator within a fiber laser cavity has been proposed and generated up to a 19 W output [16] . However, the laser stability and power scalability remain to be demonstrated.…”

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confidence: 99%

33 W continuous-wave single-frequency green laser by frequency doubling of a single-mode YDFA

et al. 2017

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A high power continuous-wave single-frequency green fiber laser by second-harmonic generation of a Yb-doped fiber amplifier (YDFA) is developed. A linearly polarized single-mode fiber amplifier produces a 60 W infrared laser at 1064 nm with a 103 W incident diode pump laser at 976 nm, corresponding to an optical conversion efficiency of 58%. An external bow-tie enhancement cavity incorporating a noncritically phase-matched lithium triborate crystal is employed for second-harmonic generation. A 33.2 W laser at 532 nm is obtained with a 45 W incident 1064 nm fundamental laser, corresponding to a conversion efficiency of 74%.OCIS Continuous-wave (CW) green lasers have many scientific and industrial applications, including laser display [1,2] , pumping of Ti-sapphire and dye lasers [3] , semiconductor mask inspection [4] , the generation of CW UV radiation by second-harmonic generation (SHG) [5] , etc. Due to the lack of solid state gain medium that can directly lase at the green spectral range, the standard method for generating a green laser is nonlinear frequency conversion. Periodically poled lithium niobate/tantalite (LiNbO 3 ∕LiTaO 3 ) or potassium titanyl phosphate (KTP) can be used to efficiently produce visible sources by a single-pass SHG of near-infrared lasers, which have a high effective nonlinear coefficient d eff . But, they are prone to damage when the incident fundamental power is higher than multiple tens of watts [6][7][8][9] . For high power applications, the use of nonlinear crystals with a higher tolerance to optical power is necessary. Lithium triborate (LBO) is an excellent nonlinear crystal with a high damage threshold, which, however, has a smaller d eff . Intracavity frequency doubling is commonly used in solid state lasers to improve the SHG efficiency by increasing the fundamental power incident on the nonlinear crystal. However, the thermal effects in the laser medium limit the output power and the optical beam quality [10,11]

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Efficient second-harmonic generation of continuous-wave Yb fiber lasers coupled with an external resonant cavity

et al. 2012

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Internal resonantly enhanced frequency doubling of continuous-wave fiber lasers

Cited by 22 publications

References 6 publications

Variable-wavelength second harmonic generation of CW Yb-fibre laser in partially coupled enhancement cavity

Variable-wavelength second harmonic generation of CW Yb-fibre laser in partially coupled enhancement cavity

33 W continuous-wave single-frequency green laser by frequency doubling of a single-mode YDFA

Efficient second-harmonic generation of continuous-wave Yb fiber lasers coupled with an external resonant cavity

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