50W CW visible laser source at 589nm obtained via frequency doubling of three coherently combined narrow-band Raman fibre amplifiers

Taylor, Luke; Feng, Yang; Calia, Domenico Bonaccini

doi:10.1364/oe.18.008540

Cited by 146 publications

(60 citation statements)

References 24 publications

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“…Noncritical phase matching is beneficial because it avoids a walk-off angle between the fundamental and harmonic waves, which tends to distort the harmonic beam shape [14] and limits the interaction length. Furthermore, several publications have reported that, at the employed intensity levels, LBO did not show the above-mentioned performance degradations (e.g., [15,16]). As we did not know if this holds for higher intensities, we intended to mitigate such problems in advance by use of a long crystal and by designing a considerably bigger waist inside the crystal than that which corresponded to maximum single-pass conversion efficiency (also known as Boyd-Kleinman focusing) [17].…”

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confidence: 95%

Continuous-wave single-frequency 532 nm laser source emitting 130 W into the fundamental transversal mode

2010

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The nonlinear effect of second-harmonic generation is an efficient way to realize high-power green laser sources. But when scaling up the harmonic power, many setups reported in the literature have been limited by conversion efficiency degradation or the fundamental laser power. Here we report on the generation of 134 W of cw laser light at a wavelength of 532 nm from a fundamental power of 149 W by second-harmonic generation in an external optical resonator comprising a lithium triborate crystal. The external conversion efficiency was 90%. The harmonic light consisted of a single spectral line. At least 97% of it was emitted into the fundamental transversal mode.

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confidence: 95%

Continuous-wave single-frequency 532 nm laser source emitting 130 W into the fundamental transversal mode

2010

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Section: Abstract-sum-frequency Generation; Yellow Laser; Solid-statementioning

confidence: 99%

“…For example, output power of 50W is demonstrated with sum-frequency mixing of injection-locked Nd:YAG continuous-wave (CW) lasers [3]. The other is frequency doubling of 1178nm CW Raman fiber amplifiers and output power of 50W is achieved [4].In this letter, we have developed a high beam quality and narrow linewidth yellow beam at 589nm by extra-cavity sumfrequency mixing 1064 and 1319 nm radiations of quasicontinuous-wave (QCW) diode-pumped Nd:YAG lasers in a LBO crystal. The 1064 and 1319nm lasers are generated by means of a diode-pumped Nd:YAG master-oscillator poweramplifier (MOPA) system.…”

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confidence: 99%

Progress on high power quasi-continuous-wave sodium beacon laser

Peng

Yang

Xie

et al. 2011

2011 Academic International Symposium on Optoelectronics and Microelectronics Technology

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A 33W 589 nm sodium beacon laser with the linewidth of 0.4 GHz and the beam quality of M 2 = 1.2 is achieved by sumfrequency mixing 1064 nm and 1319 nm quasi-continuous-wave (QCW) diode-pumped Nd:YAG lasers with a LBO crystal. The repetition rate of the laser is 500 Hz with the pulse width of 120 μs. Compared with the continuous-wave (CW) sodium beacon laser, the QCW microsecond-pulse sodium beacon laser can provide a gatable pulse format to eliminate the interference of atmospheric Rayleigh scattering and reduce stretching phenomenon of the imaging spot for sodium guide star, so the better correction effect can be achieved by using the adaptive optics system with the microsecond-pulse laser. A microsecondpulse sodium beacon laser prototype is developed to generate a sodium laser guide star which is observed by the 1.8m telescope in Yunnan province. Keywords-sum-frequency generation; yellow laser; solid-stated laser; sodium beaconDiode-pumped solid-state yellow lasers have become interesting for many applications in medicine, biotechnology, display, communications, and remote sensing. Especially, high power and high beam quality and narrow linewidth yellow laser at the sodium D2 line of 589nm can be used to create an artificial guide star for adaptive optical telescope systems by exciting atomic sodium in the upper atmosphere (85 to 105km) [1]. It is very difficult to achieve high power solid-state yellow laser with directly frequency doubling in general because the fluorescence spectrum intensity of corresponding fundamental frequency for Nd or Yb laser is too weak. At present, there are two main methods to produce high average power and narrow linewidth solid-stated yellow laser. One is sum-frequency mixing the two lines of Nd:YAG lasers operating near 1064 and 1319 nm [2]. For example, output power of 50W is demonstrated with sum-frequency mixing of injection-locked Nd:YAG continuous-wave (CW) lasers [3]. The other is frequency doubling of 1178nm CW Raman fiber amplifiers and output power of 50W is achieved [4].In this letter, we have developed a high beam quality and narrow linewidth yellow beam at 589nm by extra-cavity sumfrequency mixing 1064 and 1319 nm radiations of quasicontinuous-wave (QCW) diode-pumped Nd:YAG lasers in a LBO crystal. The 1064 and 1319nm lasers are generated by means of a diode-pumped Nd:YAG master-oscillator poweramplifier (MOPA) system. Both 1064 and 1319 nm seed laser are ring master-oscillators with the gain media of Nd:YAG crystal. Both 1064 and 1319 nm seed lasers are amplified by two laser amplifiers. The beam width of the 1064 and 1319 nm lasers inside the nonlinear optical crystal of LBO is optimized. As a result, QCW average output power of 33 W with the linewidth of 0.4 GHz and the beam quality factor of M2 = 1.2 at 589nm is demonstrated. Compared with the continuouswave (CW) sodium beacon, the QCW microsecond-pulse sodium beacon can provide a gatable pulse format to eliminate the interference of atmospheric Rayleigh scattering and reduce stretching phenomenon of the imaging ...

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“…A bow-tie external resonant cavity incorporating an LBO nonlinear optical crystal is used for generating the second harmonic of the fiber laser. The LBO crystal is type-I noncritically phase matched, which avoids a walk-off effect between the fundamental and harmonic waves [19,20] . A 33.2 W green laser at 532 nm is generated with a 45 W incident fundamental laser.…”

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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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50W CW visible laser source at 589nm obtained via frequency doubling of three coherently combined narrow-band Raman fibre amplifiers

Cited by 146 publications

References 24 publications

Continuous-wave single-frequency 532 nm laser source emitting 130 W into the fundamental transversal mode

Continuous-wave single-frequency 532 nm laser source emitting 130 W into the fundamental transversal mode

Progress on high power quasi-continuous-wave sodium beacon laser

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

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