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Generation of one-dimensional vortex-arrays with tunable singularity and high peak power in a passively Q-switched microchip laser.
- Source :
-
Optics & Laser Technology . Nov2021, Vol. 143, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- • One-dimensional vortex-arrays with singularity tuned from 1 to 4 have been achieved. • Four-singularity vortex-array with peak power of 5.56 kW has been achieved. • A method for developing pulsed one-dimensional vortex-array with tunable singularity. One-dimensional (1D) vortex-arrays with multiple-singularity aligning along a line are flexible for microparticle manipulation, high capacity storage, material processing. Moreover, a high peak power one-dimensional vortex-array with large singularity enables assemble processing. The development of a miniature laser to directly generate one-dimensional vortex-array with tunable singularity is of great value for practical applications. However, solid-state lasers for this purpose was limited by the low power, low efficiency and less singularity achieved. Here, we demonstrate a simple and robust method for directly generating one-dimensional vortex-array with singularity tunable upon to 4 in a tilted Nd:YAG/Cr4+:YAG composite crystal passively Q-switched (PQS) microchip laser, irradiated by a decentered annular beam (DAB). The singularity of one-dimensional vortex-array can be tuned from 1 to 4 by controlling the offset of collimating lens, Δ x. The average output power of one-dimensional vortex-array with 4 singularities is 0.76 W at P in = 5.66 W, the optical conversion efficiency is 13.4%. One-dimensional vortex-array with 4 singularities processes pulse width of 3.5 ns, peak power of 5.56 kW. The achieved results suggest the potential that DAB can be used a practical pump beam in PQS microchip laser for generating nanosecond, high peak power one-dimensional vortex-arrays with tunable singularity. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00303992
- Volume :
- 143
- Database :
- Academic Search Index
- Journal :
- Optics & Laser Technology
- Publication Type :
- Academic Journal
- Accession number :
- 151736288
- Full Text :
- https://doi.org/10.1016/j.optlastec.2021.107367