Abstract
Two-dimensional (2D) materials as saturable absorbers (SAs) have attracted intense interest for applications in pulsed laser generation because of their distinguishing optical properties. However, the existing methods of preparing SAs were insufficient. Here, we fabricated graphene oxide (GO) SAs by Langmuir-Blodgett (LB) methods for passively Q-switched Nd:YAG laser. The GO sheets were deposited on a quartz plate using the LB method. Two different LB-GO SAs grown under the surface pressure of 22 and 38 mN/m were obtained. Compared with the drop coating method, LB-GO SA exhibited more excellent uniformity, larger nonlinear performance and higher optical transparency. By inserting LB-GO SA into the Nd:YAG laser linear cavity, the short pulse duration of 156 ns and the average output power of 1.313 W were obtained. The slope efficiency was as high as 43.7%, due to low loss of the LB-GO SA. Our results illustrated a new way for preparing the SA using the LB technique.
Highlights
The beginning of a new era of material science has been demonstrated by discovering many new kinds of nanomaterials with superb and novel applications in electronics, sensors, and so on [1,2,3,4]
These results agree with the π−A curve, indicating that coatings compressed in the solid region are typically more compact those compressed in the liquid zone
Raman spectra showed three characteristic peaks: 1D peak at 1356.5 cm−1,1G peak at 1604.9 cm−1 and 2D peak at 2739.6 cm−1 for the graphene oxide (GO)-22 sample and 1D peak at 1351.1 cm−1,1G peak at 1601.7 cm−1 and 2D peak at 2738.2 cm−1 for the GO-38 sample. 1D, 1G and 2D Raman bands associated with the GO film obtained by drop coating were observed at 1346.4 cm−1, and 1600.1 cm−1 and 2732.6 cm−1, respectively
Summary
The beginning of a new era of material science has been demonstrated by discovering many new kinds of nanomaterials with superb and novel applications in electronics, sensors, and so on [1,2,3,4]. Graphene oxide, carbon nanotubes, molybdenum disulfide, black phosphorus, zirconium disulfide and many others are widely used as saturable absorbers (SAs) in lasers [8,9,10,11,12,13,14]. Q-switched lasers are very important in applications related to remote sensing, range finding and telecommunications [15,16] because of their compactness, low-cost and flexible designs [17,18]. Performances of SAs such as a high damage threshold, large area, thickness controllability, low insertion losses, and smooth surface are very important for the Q-switched laser performance [19,20]. A rough material surface will lead to optical scattering, which has a significant impact on the properties of the absorbers [21,22,23]. Nanoscale modification of surface roughness attracted serious research interest with the goal to improve thin films [24]
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