33 W quasi-continuous-wave narrow-band sodium D<sub>2a</sub>laser by sum-frequency generation in LBO

Wang, Pengyuan; Xie, S.; Yang, Bo; Wang, Baoshan; Zuo, Jun-Wei; Wang, Zhichao; Shen, Yu; Zhang, Fengfeng; Wei, Kai; Jin, Kai; Xu, Yonggang; Xu, Jialin; Peng, Qinjun; Zhang, Jingyuan; Lei, Wenqiang; Cui, Dafu; Zhang, Yudong; Zhang, Xu

doi:10.1088/1674-1056/23/9/094208

Cited by 21 publications

(10 citation statements)

References 14 publications

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“…In this letter, we report an all-solid-state, 41 W, sub-GHz line width, hundred-microsecond pulsed 589 nm sodium laser with 600 Hz repetition rate, based on SFG of two QCW diode-pumped Nd:YAG master-oscillator power-amplifier (MOPA) lasers operating at 1319 and 1064 nm, respectively. Compared with our previous work 19 , the spiking behavior of 589 nm laser is efficiently suppressed with the insertion of doublers in each oscillator, which has the effect of avoiding the sodium atoms saturation and improving the coupling efficiency. A prototype of this laser system is mounted on the 1.8 m telescope for astronomical AO application, where improving sodium excitation efficiency by optimizing the pulse format, yellow wavelength, polarization and repumping characteristics of 589 nm laser beam are a focus of study.…”

Section: Introductionmentioning

confidence: 81%

“…Sodium beacon lasers have been widely studied with nonlinear frequency-conversion techniques of fiber lasers 10 – 12 and solid-state lasers 13 – 19 . Moreover, the diode-pumped solid-state lasers have shown well promising with the advantages of higher power, more reliability, and a more robust setup.…”

Section: Introductionmentioning

confidence: 99%

“…However, its repetition rate is too low for AO system to detect and correct high-order aberration caused by atmospheric turbulence. Recently, we demonstrate a 500 Hz QCW microsecond-pulse sodium laser with an output power of 33 W, a pulse width of 120 μs and linewidth of 0.44 GHz 19 , and a photon return of 600–900 photons∕cm 2 ∕s (i.e. 30–45 photons∕cm 2 ∕s/W) is realized on the Large Zenith Telescope facility of the University of British Columbia.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of return photons from sodium laser beacon excited by a 40-watt facility-class pulsed laser for adaptive optical telescope applications

Bian

Yang

Zuo

et al. 2018

Sci Rep

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The brightness of the artificial beacon is one critical performance parameter for adaptive optics. Here, a 40-watt level narrow-linewidth microsecond pulsed yellow laser is produced at 589 nm with a high repetition frequency of 600 Hz and a pulse duration of 120 μs. An experiment to project the pulse beam up to the sky and measure the fluorescence photon returns of the Na atoms has been held on the 1.8-meter telescope in Lijiang observatory. During the sky test, a laser guide star (LGS) spot is firstly observed with Rayleigh scattering elimination by means of a gateable pulse format. And, the central wavelength of the laser could be accurately locked to be 589.1584 nm with a linewidth of ~0.34 GHz to match that of sodium-D2a line. Optical pumping with circularly polarized light has also been used to increase the brightness of sodium LGS. In order to maximize the return flux, sodium D2b repumping option is done by an electro-optic modulator with the optimum D2a-D2b frequency offset. As a result, a bright sodium LGS with the return flux of 1610 photons/cm2/s is achieved, corresponding to ~47 photons/cm2/s/W of emitted laser power, which represents a significant improvement in terms of brightness reported ever.

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Section: Introductionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of return photons from sodium laser beacon excited by a 40-watt facility-class pulsed laser for adaptive optical telescope applications

Bian

Yang

Zuo

et al. 2018

Sci Rep

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“…The laser pump modules are cooled by circulating water that is maintained at 22 AE 0:1 C by a closed-cycle water chiller. A complete technical description of the laser is found in Wang et al (2014).…”

Section: Characteristics Of the Tipc Pulsed Lasermentioning

confidence: 99%

On-Sky Tests of a High-Power Pulsed Laser for Sodium Laser Guide Star Adaptive Optics

Otárola

Hickson

Gagné

et al. 2016

J. Astron. Instrum.

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We present results of on-sky tests performed in the summer of 2013 to characterize the performance of a prototype high-power pulsed laser for adaptive optics. The laser operates at a pulse repetition rate (PRR) of 600-800 Hz, with a 6% duty cycle. Its coupling e±ciency was found to be, in the best test case (using 18 W of transmitted power), 231 AE 14 photons s À1 sr À1 atom À1 W À1 m 2 when circular polarization was employed and 167 AE 17 photons s À1 sr À1 atom À1 W À1 m 2 with linear polarization. No improvement was seen when D 2b repumping was used, but this is likely due to the relatively large laser guide star (LGS) diameter, typically 10 arcsec or more, which resulted in low irradiance levels. Strong relaxation oscillations were present in the laser output, which have the e®ect of reducing the coupling e±ciency. To better understand the results, a physical modeling was performed using the measured pulse pro¯les and parameters speci¯c to these tests. The model results, for a 10 arcsec angular size LGS spot, agree well with the observations. When extrapolating the physical model for a sub-arcsecond angular size LGS (typical of what is needed for a successful astronomical guide star), the model predicts that this laser would have a coupling e±ciency of 130 photons s À1 sr À1 atom À1 W À1 m 2 , using circular polarization and D 2b repumping, for a LGS diameter of 0.6 arcsec Full Width at Half Maximum (FWHM), and free of relaxation oscillations in the 589 nm laser light.

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“…Additionally, the alternatively working mode of QCW lasers, fire and pause, shortens the interaction between the aimed material and the surroundings, and protects the material from oxidation during the welding or 3D printing process. Recently, the high-power high beam quality QCW solid-state lasers were also utilized to produce a high-power 589.159 nm yellow laser through nonlinear frequency conversion for laser guide star [5,6].…”

Section: Introductionmentioning

confidence: 99%

82 kW high beam quality quasi-continuous-wave face-pumped Nd:YAG slab amplifier

Chen

Guo

et al. 2015

Appl. Opt.

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An 8 kW level quasi-continuous-wave (QCW) face-pumped 1064 nm slab laser with high beam quality was developed by a master oscillator power amplifier (MOPA) system. A single-mode fiber seed laser was amplified by two-stage single-pass Nd:YAG rod preamplifiers and four face-pumped Nd:YAG slab amplifiers. The slab amplifiers were well designed with uniform pumping and uniform cooling for well-distributed thermal and stress. A dynamically feedbacked optical aberration compensation device was employed to correct low-order optical aberration, and the residue high-order optical aberration was corrected by an adaptive optics system. The QCW MOPA delivered up to an average power of 8.2 kW with a pulse duration of 200 μs at a repetition rate of 400 Hz. The beam quality factor was measured to be β=3.5.

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33 W quasi-continuous-wave narrow-band sodium D_2alaser by sum-frequency generation in LBO

Cited by 21 publications

References 14 publications

Investigation of return photons from sodium laser beacon excited by a 40-watt facility-class pulsed laser for adaptive optical telescope applications

Investigation of return photons from sodium laser beacon excited by a 40-watt facility-class pulsed laser for adaptive optical telescope applications

On-Sky Tests of a High-Power Pulsed Laser for Sodium Laser Guide Star Adaptive Optics

82 kW high beam quality quasi-continuous-wave face-pumped Nd:YAG slab amplifier

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33 W quasi-continuous-wave narrow-band sodium D2alaser by sum-frequency generation in LBO

Cited by 21 publications

References 14 publications

Investigation of return photons from sodium laser beacon excited by a 40-watt facility-class pulsed laser for adaptive optical telescope applications

Investigation of return photons from sodium laser beacon excited by a 40-watt facility-class pulsed laser for adaptive optical telescope applications

On-Sky Tests of a High-Power Pulsed Laser for Sodium Laser Guide Star Adaptive Optics

82 kW high beam quality quasi-continuous-wave face-pumped Nd:YAG slab amplifier

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33 W quasi-continuous-wave narrow-band sodium D_2alaser by sum-frequency generation in LBO