AI Article Synopsis
- High-contrast, ultrafast laser pulses of 30 femtoseconds (fs) and 1.5 petawatts (PW) are produced using a chirped-pulse amplification (CPA) Ti:sapphire laser system with a low repetition rate of 0.1 Hz.
- The system achieves a maximum output energy of 60.2 joules (J) and utilizes four frequency-doubled Nd:glass lasers for pumping, while employing techniques to suppress unwanted lasing effects.
- After passing through a four-grating pulse compressor, the laser produces 44.5 J of energy with a peak power of around 1.5 PW, marking record output levels for this type of laser system.
Article Abstract
High-contrast, 30 fs, 1.5 PW laser pulses are generated from a chirped-pulse amplification (CPA) Ti:sapphire laser system at 0.1 Hz repetition rate. The maximum output energy of 60.2 J is obtained, at a pump energy of 120 J, from a booster amplifier that is pumped by four frenquency-doubled Nd:glass laser systems. During amplification, parasitic lasing is suppressed by index matching fluid with absorption dye and the careful manipulation of the time delay between the seed and pump pulses. An amplified pulse passes through a pulse compressor consisting of four gold-coated gratings. After compression, the measured pulse duration is 30 fs, and the output energy is 44.5 J, yielding a peak power of about 1.5 PW. The output energy of 44.5 J and output power of 1.5-PW are the highest values ever achieved from the femtosecond CPA Ti:sapphire laser system. To maintain a sufficiently high temporal contrast, a saturable absorber is installed in the front-end system with two ultrafast Pockels cells in order to minimize the amplified spontaneous emission (ASE) and pre-pulse intensity. An adaptive optics system is implemented for PW laser pulses and a focused intensity of about 1 × 10(22) W/cm(2) can be obtained when an f/3 optic is used.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OE.20.010807 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Auxillary aids for pain and anxiety reduction during dental local anesthesia in pediatric patients: a systematic review.
Evid Based Dent
January 2025
Department of Paediatric and Preventive Dentistry I.T.S Dental College, Hospital and Research Centre, Greater Noida, Uttar Pradesh, India.
Aims/objectives: This systematic review aimed to evaluate the effectiveness of auxiliary aids-Transcutaneous Electrical Nerve Stimulation (TENS), vibrotactile devices, and Low-Level Laser Therapy (LLLT) in reducing pain and anxiety during dental local anesthesia in pediatric patients.
Methods: The review followed PRISMA guidelines, employing a comprehensive search strategy across multiple databases (PubMed, Cochrane, EBSCO, LILACS, Google Scholar, and Embase) from 2014 to July 2024. Eligibility criteria were based on the PICOS framework, focusing on randomized clinical trials and clinical studies involving pediatric patients undergoing dental procedures with local anesthesia.
Progress in understanding the infrared spectrum of the H2O-O2 dimer.
J Chem Phys
January 2025
Department of Physics and Astronomy, University of Calgary, 2500 University Drive North West, Calgary, Alberta T2N 1N4, Canada.
Spectra of the weakly bound H2O-O2 dimer are studied in the region of the H2O ν2 band using a tunable quantum cascade laser to probe a pulsed supersonic slit jet expansion. These are the first gas-phase infrared spectra of H2O-O2 and among only a few such results for O2-containing complexes. Almost 100 infrared lines are assigned based on the ground state combination differences from the microwave spectrum of H2O-O2.
View Article and Find Full Text PDFEfficient coupling of dual beam combined laser into micro water jet for deep processing.
Sci Rep
January 2025
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Science, Zhejiang, 315201, Ningbo, China.
In order to improve the power and energy of water-jet-guided laser, this paper introduces a double beam water-jet-guided laser (DWJL) technology. Based spatially polarized light combination and temporal phase modulation, two lasers are effectively coupled into a water jet with diameter of 100 μm. The maximum output peak power reaches 100 kW and the maximum pulse energy is 4.
View Article and Find Full Text PDFPain-Related Responses in Preterm Babies Using Automated and Laser Heel-Lancing Devices.
Creat Nurs
January 2025
Department of Pediatrics, Haeundae Paik Hospital, Inje University, Busan, South Korea.
This study aimed to compare the pain-related behavioral and physiological responses and puncture-related characteristics between automated and laser lancets and examine the correlation between infants' pain-related responses and facial expressions during heel lancing in a neonatal intensive care unit. Pain-related responses were assessed using the Neonatal Infant Pain Scale, heart rate, and oxygen saturation through pulse oximetry. Facial expressions were also analyzed using a facial recognition application.
View Article and Find Full Text PDFBoron-Doped Endohedral Metallofullerenes: Synthesis and Computational Analysis of a Family of Heteroatom-Doped Molecular Carbons.
Inorg Chem
January 2025
Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, c/Marcel·lí Domingo 1, 43007 Tarragona, Spain.
Gas-phase synthesis and detection of boron-doped nitride clusterfullerenes and a large variety of monometallofullerenes have been achieved using a pulsed laser vaporization cluster source. Density functional theory (DFT) calculations show that the electronic structures of boron-doped endohedral metallofullerenes differ from those of the pristine all-carbon cages due to the lack of one electron upon boron substitution. For monometallofullerenes, this is likely the main reason for the somewhat different abundance distribution observed for boron-doped with respect to all-carbon cages.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!