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Generation of 7-fs laser pulse directly from a compact ti:sapphire laser with chirped mirrors

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Science China(Physics,Mechanics & Astronomy) 2007年第3期50卷 261-266页

作者： ZHAO YanYing WANG Peng ZHANG Wei tiAN JinRong WEI ZhiYi Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100080China College of Applied Science Beijing University of TechnologyBeijing 100022China

A compact femtosecond ti:sapphire laser resonator consisting of three chirped mirrors and one output coupler was designed. By accurately balancing the intra- cavity dispersions between ti:sapphire crystal, air and chirped mirrors, we directly generated the laser pulse shorter than 7 fs at the average power of 340 mW with 3.1 W pump. The repetition rate of the laser oscillator is 173 MHz at the centre wavelength of 791 nm, and the ultrabroaden spectrum covers from 600 nm to 1000 nm. To the best of our knowledge, this is the simplest laser resonator capable of generating sub-10 fs laser pulse.

关键词： ti:sapphire laser chirped mirror femtosecond few cycles pulse

Splicing technology of ti:sapphire crystals for a high-energy chirped pulse amplifier laser system

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High Power Laser Science and Engineering 2014年第2期2卷 1-8页

作者： Yanqi Liu Yuxin Leng Xiaoming Lu Yi Xu Cheng Wang State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences

We develop a splicing technology of ti:sapphire crystals for a high-energy chirped pulse amplifier laser system that can suppress the parasitic lasing to improve the amplification efficiency compared to a large-size single ti:sapphire crystal amplifier. Theoretical investigations on the characteristics of the amplifier with four splicing ti:sapphire crystals,such as parasitic-lasing suppression and amplification efficiencies, are carried out. Some possible issues resulting from this splicing technology, including spectral modulation, stretching or splitting of the temporal profile, and the sidelobe generation in the spatial domain(near field and far field), are also investigated. Moreover, the feasibility of the splicing technology is preliminarily demonstrated in an experiment with a small splicing ti:sapphire crystals amplifier. The temporal profile and spatial distribution of the output pulse from the splicing ti:sapphire crystal amplifier are discussed in relation to the output pulse from a single ti:sapphire crystal amplifier.

关键词： chirped pulse amplification splicing technology ti:sapphire crystal amplifier

Amplification and compression of ti:sapphire femtosecond pulses at high-repetition-rate

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Science China Mathematics 1998年第1期41卷 107-112页

作者：赵尚弘王屹山陈国夫王贤华侯洵 State Key Laboratory of Transient Optics and Technology Xi’an Institute of Optics and Fine Mechanics Chinese Academy of Sciences Xi’an China

The experiment of the generation and amplification of femetosecond ti:sapphire laser pulse at high repetition rate is reported. The laser pulses with minimum pulsewidth 15 fs, maximum spectrum width of 80 nm, average power of 200 mW are generated from a home built self mode locked ti:sapphire laser. As a seed pulse which is selected from the oscillator, the laser pulse is further amplified by using chirped pulse amplification technology in a ti:sapphire amplifier from which a kind of pulses with single pulse energy of 100 μJ,pulsewidth after compressing of 50 fs at 5 kHz repetition rate are produced. The system design and experimental results are discussed.

关键词： ti:sapphire self mode locking femtosecond pulses chirped pulse amplification.

Highly efficient TW multipass ti:sapphire laser system

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Science China Mathematics 2000年第10期43卷 1083-1087页

作者：魏志义张杰夏江帆冯宝华张秀兰邱阳 Laboratory of Optical Physics Institute of Physics Chinese Academy of Sciences Beijing 100080 China

An efficient chirped-pulse amplification, ti:sapphire laser system, has been developed using mainly domestic components. The gain-narrowing effect has been significantly overcome by shaping spectrum of seeding pulses. With a novel aberration-free stretcher and two stage multi-pass amplifiers, pulses with duration of 25 fs and 36-mJ energy have been obtained at 10 Hz repetition rate, using only less than 290 mJ green Nd: YAG pump energy. This corresponds to a 1.4 TW peak power and 32% main amplification efficiency. The energy stability of the laser systems is better than ± 3% .

关键词： terawatts (TW ) femtosecond laser pulses chirped-pulses amplification ti:sapphire laser.

A 100-TW ti:sapphire Laser System at a Repetition Rate of 0.1 Hz

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Chinese Physics Letters 2012年第1期29卷 141-143页

作者：滕浩马景龙王兆华郑义葛绪雷张伟魏志义李玉同张杰 Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190 Department of Physics Shanghai Jiao Tong UniversityShanghai 200240

We demonstrate a 100-TW-class femtosecond ti:sapphire laser running at a repetition rate of 0.1Hz based on a 20TW/10 Hz laser facility (XL-Ⅱ).Pumping the new stage amplifier with a 25J green Nd:glass laser,we success... 详细信息

关键词： ti:sapphire amplifier laser

Theoretical study on residual infrared absorption of ti:sapphire laser crystals

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Photonics Research 2021年第6期9卷 909-915页

作者： QIAORUI GONG CHENGCHUN ZHAO YILUN YANG QIANNAN FANG SHANMING LI MIN XU YIN HANG Laboratory of Micro-Nano Optoelectronic Materials and Devices Key Laboratory of High-Power Laser MaterialsShanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Residual infrared absorption is a key problem affecting the laser emission efficiency of ti:sapphire crystal.In this paper,the origin of residual infrared absorption of ti:sapphire crystal is systematically studied by using the first principles method.According to the contact conditions of O octahedron in the crystal structure of Al_(2)O_(3),four ti^(3+)−ti^(3+)ion pair models and three ti^(4+)−ti^(3+)ion pair models were defined and constructed.For what we believe is the first time,the near-infrared absorption spectra consistent with the experimental results were obtained in specific theoretical models.The electronic structures,absorption spectra,and charge distributions calculated show that the line-contact ti^(3+)−ti^(3+)ion pair with antiferromagnetic coupling and the facecontact ti^(4+)−ti^(3+)ion pair are two main contributors to the residual infrared absorption of ti:sapphire,while some other ion pair models provide a basis to explain more complex residual infrared absorption.

关键词： ti:sapphire laser absorption