High power Nd:YVO-KGW conical refraction laser

Howlader, Chandan; Nadimi, Mohammad; Waritanant, Tanant; Fedorova, Ksenia A.; Sokolovskiĭ, G. S.; Rafailov, Edik U.; Major, Arkady

doi:10.1117/12.2508968

Cited by 4 publications

(4 citation statements)

References 58 publications

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“…Another interesting topic for future studies could be exploring the comparative performance of single-, dual-, and multi-wavelength lasers. Neodymiumdoped solid-state lasers can be used as a laser source for such comparisons [50][51][52][53][54][55][56][57][58].…”

Section: Discussionmentioning

confidence: 99%

Effect of Laser Biostimulation on Germination of Sub-Optimally Stored Flaxseeds (Linum usitatissimum)

et al. 2022

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Sub-optimal storage of grains could deteriorate seed germination and plant viability. Recent research studies have established that laser biostimulation of seeds could be used as a safe and sustainable alternative to chemical treatment for improving crop germination and growth. Herein, the efficacy of this novel technique is evaluated to see if poor germinability caused by sub-optimal storage of flaxseeds (Linum usitatissimum) could be reversed using laser biostimulation. Healthy flaxseeds were first subjected to sub-optimal storage conditions (30 °C for ten weeks) to degrade their germinability. Two low-cost lasers, including a single-wavelength red laser (659 nm) and a dual-wavelength green/infrared laser (531 and 810 nm (ratio ~10:1)) were then used on two groups viz. healthy (properly stored) and sub-optimally stored (artificially degraded (AD)) seeds and irradiated for 0 (control), 5, 10, and 15 min using total power densities of 7.8 and 6.2 mW/cm2, respectively. In the case of AD seeds, 5-min dual-wavelength laser treatment was found to be the most efficient setting as it improved the mean germination percentage, mean germination time, germination speed, germination rate index, wet weight, and dry weight by 29.3, 16.8, 24.2, 24.2, 15.7, and 20.6%, respectively, with respect to control samples. In the case of healthy seeds, dual-wavelength laser treatment could induce significant enhancement in seeds’ root length, wet weight, and dry weight (improved by 26, 23, and 8%, respectively) under 10 min of irradiation. On the other hand, the effect of applied red laser treatment was not very promising as it could only induce significant enhancement in the mean germination time of AD seeds (improved by 17%). Overall, this study demonstrates the potential of laser biostimulation in reversing the adverse effect of poor crop storage. We believe these findings could spur the development of a physical tool for manipulating seed germination and plant growth.

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Section: Discussionmentioning

confidence: 99%

Effect of Laser Biostimulation on Germination of Sub-Optimally Stored Flaxseeds (Linum usitatissimum)

et al. 2022

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“…After characterizing the laser in the continuous-wave (CW) regime, an 18 mm-long KGW crystal cut along its optical axis (the CR crystal) was placed between the focusing mirror M3 and the output coupler to observe CR laser radiation. The KGW crystal was also used in the previous experiments as a CRE [14][15][16][17][18][19][20][56][57][58]. The reason for the popularity of the KGW is the strong anisotropy in its optical and physical properties [59][60] as well as high optical quality.…”

Section: Methodsmentioning

confidence: 99%

“…It complicates the understanding of the effect of the CR on the Gaussian laser mode. Recently, a new set up for CR laser was proposed where the CRE was kept separate from the laser crystal [19,20]. Keeping the CRE separate from the laser crystal does not only allow the power scaling but it also allows for laser adjustment to achieve better conditions of CR.…”

Section: Introductionmentioning

confidence: 99%

Diode-pumped Yb:CALGO laser with conical refraction output

Reza

Akbari

Fedorova

et al. 2020

Solid State Lasers XXIX: Technology and Devices

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A high power conical refraction (CR) laser was demonstrated based on Yb:CALGO laser crystal with a separate intracavity CR element. The CR laser delivered the maximum output power of 6.25 W at 25 W of incident pump power which is the highest output power for the CR lasers to date. The separation of the CR element from the laser gain medium reduced the complexity of laser pumping. The generated CR laser beam exhibited excellent quality with well-resolved concentric rings and the Poggendorff dark ring.

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“…Recently, we have demonstrated a CR laser based on separate intracavity conerefringent element (CRE) and laser host (Nd:YVO), and CR laser beam with unprecedented quality with fully resolved concentric rings was generated [13]. The separation of the CR element and the laser host made it possible to alleviate the complex pumping and facilitate the power scalability of the laser [26,27]. The laser properties such as wavelength was also independent from the CRE material.…”

Section: Introductionmentioning

confidence: 99%