Abstract
Development of high energy laser sources with nanosecond pulses at several hertz values for repetition rate has been very attractive in recent years due to their great potential for practical applications. With the recent advancement in fabricating large size laser quality transparent ceramics, diode pumped solid-state laser generating pulse energy of 100 J at 10 Hz has been recently realized at HiLASE center using Yb:YAG ceramic with Cr:YAG cladding. This review discusses Yb based high energy lasers, specific laser geometries for efficient thermal management and the role of transparent ceramics in such diode pumped high-energy-class solid-state lasers around the world.
Highlights
High power diode pumped solid-state lasers have gained more attention in recent years due to their potential scientific and technological applications ranging from laser fusion research to industrial materials processing
High power laser diodes coupled by coupling optics or optical fiber are efficient pump sources for solid-state lasers based on materials such as crystals, glasses or ceramics
The most common high energy laser based facilities such as National Ignition Facility (NIF) in USA, Shenguang-III in China, and Laser Mega Joule (LMJ) in France are based on Nd: glass[6]
Summary
High power diode pumped solid-state lasers have gained more attention in recent years due to their potential scientific and technological applications ranging from laser fusion research to industrial materials processing. Efficient, high energy, pulsed laser systems operating at high pulse repetition rates (10 Hz and beyond) are the ideal pump sources for ultra-high intensity femtosecond petawattclass lasers generating high-brightness secondary radiation (X-ray, gamma-ray) and particle (electron, proton, ion, muon) sources These have potential applications for novel medical therapies, and in high-resolution radiography and advanced imaging for industrial and security sectors. The most common high energy laser based facilities such as National Ignition Facility (NIF) in USA, Shenguang-III in China, and Laser Mega Joule (LMJ) in France are based on Nd: glass[6] These facilities can generate single shot every few hours to provide necessary time for cooling the poor thermal conductive glass media. With a brief overview of several ongoing and upcoming high power laser projects globally, we have highlighted the recent demonstration of 1 kW average power from fully diode pumped solid-state lasers using Yb:Y3Al5O12 (here after Yb:YAG) transparent ceramics at cryogenic temperature in HiLASE Center, Czech Republic
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