Demonstration of an ultraviolet stimulated Brillouin scattering pulse compressed hundred picosecond laser in LiB₃O₅crystals

Abstract

A hundred picosecond ultraviolet (UV) laser is demonstrated with a pulse duration of less than 200 ps and peak power of 0.6 GW. With a hundred picosecond stimulated Brillouin scattering compressed pulse as the fundamental light, the UV output at 355 nm is obtained by extra-cavity sum-frequency-mixing in two LiB3O5 crystals. Maximum UV energy was 100 mJ when the incident energy was 280 mJ, yielding an optical-to-optical efficiency of 35.7%. This result is of interest for the generation of high energy sub-nanosecond UV lasers which finds applications in shock ignition and industrial processing.

Distributed Fiberoptic Sensor for Simultaneous Temperature and Strain Monitoring Based on Brillouin Scattering Effect in Polyimide-Coated Fibers

“…As mentioned in Section 2, utilizing the polyimide-coated optical fiber with multipeaks as sensing fiber, a distributed simultaneous temperature and strain measurement system can be realized, which is based on multiple acoustic modes in SpBS effect. Remarkably, we think it is possible to demodulate the strain and temperature with any two peaks, as introduced by equations ( 1) and (2). Here, peak 1 and peak 2 are chosen for high intensity, which is able to provide a high SNR.…”

“…Brillouin scattering is one of the most prominent optical effects. It has been broadly studied for several decades and gained rapid progress in pulse shaping (time domain and frequency domain) [1][2][3][4][5], the amplification of weak signals [6][7][8], and in distributed strain/temperature sensors in recent years [9,10]. For the case of distributed fiberoptic sensing systems, Brillouin-based distributed sensors have been intensively investigated due to their extended distances up to hundreds of kilometres, high spatial resolution, and high accuracy.…”

Developments of Picosecond Lasers Based on Stimulated Brillouin Scattering Pulse Compression

“…In 2017, Bai et al achieved picosecond ultraviolet (355 nm) output with compact two-cell structure. The pulse width was compressed from 6.3 ns to 168 ps with an output energy of 100 mJ and the energy efficiency of about 35% [89]. In 2019, Wang et al obtained a short pulse of 820 ps at kHz repetition rate in HT270 liquid medium with energy efficiency of 52.2% for the first time [90].…”

Compact 15 mJ Fiber–Solid Hybrid Hundred-Picosecond Laser Source for Laser Ablation on Copper

“…Picosecond pulsed laser sources have been widely used for a variety of industrial manufacture and basic scientific applications, such as material processing [1,2], laserinduced damage [3], medical diagnosis [4], nonlinear optics [5,6], and laser ranging [7,8], all of which benefit from the narrow pulse width, large single-pulse energy, and sufficiently high peak power. In particular, the millijoule-level pulsed laser source with hundreds of picoseconds has great application potential in the field of material processing and laserinduced damage.…”