YCOB晶体中光学参量放大产生高能近红外飞秒激光脉冲

IF 2.1 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Romanian Reports in Physics Pub Date : 2023-09-15 DOI:10.59277/romrepphys.2023.75.405
R. DABU
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引用次数: 0

摘要

在飞秒钛蓝宝石激光器泵浦的β-硼酸钡(BBO)晶体中,由光学参量放大(OPA)产生的近红外飞秒激光脉冲的能量被限制在几个mj,这是由于可用晶体的20毫米限制直径。用飞秒Ti:蓝宝石激光在800 nm处泵浦含有氧化硼酸钇钙(YCOB)晶体的I型共线OPA中,1300 nm的信号波长和2080 nm的怠速波长分别位于正常和异常群速度色散范围内。由于信号和空闲脉冲之间的小群速度不匹配(GVM),在100 GW/cm2的泵浦强度下,在3 mm的YCOB晶体中可以获得27 THz宽的增益带宽。高参数增益是由于泵浦信号和泵浦空转脉冲之间的GVM符号不同而增加的参数相互作用长度的结果。在孔径大于50mm的YCOB晶体中,OPA可产生1300nm波长的能量大于10mj的飞秒激光脉冲。
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Generation of high-energy near-infrared femtosecond laser pulses by optical parametric amplification in YCOB crystals
"The energy of near-infrared femtosecond laser pulses generated by optical parametric amplification (OPA) in β-barium borate (BBO) crystals pumped by femtosecond Ti:sapphire lasers is restricted to few-mJ due to the 20 mm limited diam- eter of available crystals. In a type I collinear OPA with an yttrium calcium oxoborate (YCOB) crystal, pumped with femtosecond Ti:sapphire lasers at 800 nm wavelength, the 1300 nm signal wavelength and 2080 nm idler wavelength are located in the normal and anomalous group velocity dispersion range, respectively. Due to the small group velocity mismatch (GVM) between signal and idler pulses, as broad as 27 THz gain bandwidth can be obtained in a 3-mm YCOB crystal at 100 GW/cm2 pump intensity. A high parametric gain is the result of the increased parametric interaction length due to the different signs of GVM between pump-signal and pump-idler pulses. More than 10-mJ energy femtosecond laser pulses at 1300 nm wavelength can be generated by OPA in YCOB crystals with larger than 50 mm clear aperture."
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来源期刊
Romanian Reports in Physics
Romanian Reports in Physics 物理-物理:综合
CiteScore
4.20
自引率
29.60%
发文量
0
审稿时长
4-8 weeks
期刊介绍: Romanian Reports in Physics is a journal publishing physics contributions in the fields of: 1. Mathematical and General Physics 2. Nuclear Physics. Particle Physics. Astroparticle Physics 3. Atomic and Molecular Physics 4. Plasma Physics 5. Condensed Matter 6. Optics & Quantum Electronics 7. Biophysics & Medical Physics. Environmental Physics 8. Physical Methods and Instrumentation 9. Earth Physics
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