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Femtosecond laser frequency multiplier based on multi-component doped layered crystal

A femtosecond laser, layered crystal technology, applied in lasers, laser parts, phonon exciters, etc., can solve problems such as bandwidth limit limitation, and achieve the effect of wide theoretical bandwidth, reduced requirements, and good practicability

Inactive Publication Date: 2008-03-12
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(Heyuan Zhu, Tao Wang, Wanguo Zheng, et al. "Efficient second harmonic generation of femtosecond laser at 1μm" Optics Express vol.12, no.10; 17 May 2004) This type of technology has a high Practical, but its theoretical bandwidth limit is still limited by crystal dispersion (GVD)

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  • Femtosecond laser frequency multiplier based on multi-component doped layered crystal
  • Femtosecond laser frequency multiplier based on multi-component doped layered crystal
  • Femtosecond laser frequency multiplier based on multi-component doped layered crystal

Examples

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Effect test

Embodiment 1

[0038] Design KDP and KD * P-doped crystals achieve broadband frequency doubling around 1054 nm.

[0039] (1) The fundamental frequency pulse shape is Gaussian, the center wavelength is 1054nm, the pulse width is 20fs, and the corresponding spectral half-height width is 80nm. We design KDP and KD * P-doped multilayer crystal to achieve its broadband frequency doubling. Considering technical factors and cost, the designed crystal length is 20mm, the number of layers is 20, and the cutting angle is 41 degrees. In order to achieve effective frequency doubling of each frequency component, we hope that the phase matching wavelength covers the spectral range of 2 times the half-width of the fundamental frequency light, that is, 0.974um-1.134um. From Figure 2 we can see that the doping concentration x needs to be selected to vary from 80% to 88% in the crystal. The interlayer doping concentration variation function adopts a linear function. Through these optimized designs, a sim...

Embodiment 2

[0043] Design other doped crystals to achieve broadband frequency doubling around 1054nm.

[0044] (1) ADP and AD * In the case of P doping, the fundamental frequency pulse shape is Gaussian, the center wavelength is 1054 nm, the pulse width is 20 fs, and the corresponding spectral width at half maximum is 80 nm. Compared with the first part of Example 1, the designed crystal length is 20 mm, the number of layers is 20, and the cutting angle is 40.6 degrees. As shown in Figure 3, select the doping concentration x 1 The variation in crystals is 62%-69%. The interlayer doping concentration variation function adopts a linear function. The effect of broadband frequency doubling can also be achieved.

[0045] (2) Under the same fundamental frequency pulse conditions as in the first part of Example 2, to achieve the purpose of broadband frequency doubling, if KDA / KDP doped crystal is used, the designed crystal length is 20mm, the number of layers is 20, and the cutting angle is ...

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Abstract

The invention relates to a femtosecond laser frequency multiplier based on multiple chemical components and variable-doping multilayer nonlinear optical crystal. Wherein, the doping concentration varies along light direction and among layers. This invention is reliable and simple for usage, and allows super broad band.

Description

technical field [0001] The invention belongs to the technical field of laser frequency doubling, in particular to an ultra-broadband femtosecond laser frequency doubler based on a multi-chemical component variable-doped layered nonlinear optical crystal. Background technique [0002] Ultra-broadband femtosecond pulses have a wide range of applications in strong field physics, laser fusion, ultrafast measurement, etc. The increasingly mature femtosecond technology with Ti:sapphire laser as a typical carrier and the emergence of its commercial devices have greatly promoted the development of ultrafast technology itself. As an effective frequency conversion technology, frequency doubling technology has important applications in the field of femtosecond light. However, for general frequency doubling crystals, the spectral components of ultra-wideband femtosecond light far from the center frequency will not be effective frequency doubling due to too large phase mismatch. Broade...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/109
Inventor 钱列加袁鹏罗航朱鹤元范滇元
Owner FUDAN UNIV
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