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High subharmonic generation method of non-collineation

A high-order harmonic generation technology, applied in nonlinear optics, laser parts, instruments, etc., can solve the problems of affecting high-order harmonics, difficult to adjust accurately, unfavorable for narrow pulse acquisition, etc., and achieve high laser peak value The effect of power

Inactive Publication Date: 2007-02-14
EAST CHINA NORMAL UNIV
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  • Description
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Problems solved by technology

Here, because the fundamental wave intensity is very large, the inserted Brewster plate will introduce great nonlinear effects, such as the change of cavity length, the introduction of dispersion, etc., in addition to the loss of the fundamental wave, etc., which will affect the passive The stability of the cavity and the width of the laser pulse will have a great impact, which is not conducive to the acquisition of narrow pulses, which also affects the generation of higher harmonics
Some experts also proposed not to use the Brewster film, but to drill a tiny hole in the cavity mirror M4 to facilitate the output of high-order harmonics, but this method has great difficulties in actual operation, because the high-order harmonics The deviation between the wave and the direction of the fundamental wave is very small, and it is difficult to adjust accurately

Method used

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  • High subharmonic generation method of non-collineation
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Embodiment 1

[0034] In order to effectively obtain high-order harmonics, it is necessary to increase the peak light power effectively incident on the nonlinear crystal as much as possible. Such as image 3As shown, the method adopted in this scheme is to couple the pump light into two identical external four-mirror figure-of-eight annular passive cavities (or other passive cavities with suitable structures), so as to ensure the resonant frequency of the passive cavities Matching the repetition frequency of the pump light, the laser resonates in the passive cavity to achieve the effect of intracavity power enhancement, so that the nonlinear medium placed in the passive cavity can obtain several times higher than the pump light The effective incident light peak power of an order of magnitude.

[0035] image 3 The middle marks M11, M12, M21, M22 are planar mirrors coated with 650nm-1000nm broadband high-reflection film, M13, M14, M23, M24 are concave mirrors coated with 650nm-1000nm broadb...

Embodiment 2

[0038] Such as Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that the nonlinear medium is directly placed at the common focus of two laser oscillators with identical structures, since the optical power in the cavity is usually one to two orders of magnitude higher than the output power , so it can also meet the optical peak power requirements required by high-order harmonics, and the intracavity dispersion compensation is easier to implement, and it is easier to obtain period-level narrow pulses, which is conducive to improving the conversion efficiency of high-order harmonics. In the case of phase locking It is also more conducive to obtaining a single attosecond pulse, which can accurately measure the atomic spectrum in the ultraviolet band, and is convenient for obtaining atomic clocks in the X-ray region.

[0039] Figure 4 The marks M1, M2, M4, M5, M7, M8, M10, and M11 are concave mirrors coated with a broadband high-reflection film of 65...

Embodiment 3

[0041] Such as Figure 5 As shown, the difference between this embodiment and Embodiment 1 is that the nonlinear medium is placed at the common focus of the dual-cavity structure composed of a laser inner cavity and a laser passive cavity. This device effectively combines the high intensity of the passive cavity with the advantages of the short pulse of the internal cavity. Figure 5 The middle marks M1, M2, M4, M5, M8, and M9 are concave mirrors coated with a broadband high-reflection film of 650-1000nm, wherein M1 and M2, M4 and M5, M8 and M9 have the same curvature radius respectively. M3, M6, and M7 are planar mirrors coated with a broadband high-reflection film of 650-1000nm. OC1 is the output coupling mirror, which is also coated with a broadband film of 650-1000nm. T is the laser gain medium, and different materials can be selected for different wavelength bands, and titanium-doped sapphire (Ti:S) is selected in this embodiment. N is a nonlinear medium, and an inert ...

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Abstract

This invention relates to a method for generating high-order harmonic waves utilizing the non-collinear non-linear conversion property of medium, which utilizes the mixing property of non-linear beams to lead out high order harmonic waves from the cavity without additional operations in the emitted non-linear medium. The advantage is that it is easier to pick up pure high-order harmonic wave composition to obtain the harmonic waves under the multi-color action and provide even higher laser peak power.

Description

technical field [0001] The invention relates to the direction of ultrafast laser technology, and specifically relates to a method for generating high-order harmonics by using the non-collinear nonlinear conversion characteristics of a medium. Background technique [0002] The scientific research of ultra-intensive and ultra-short lasers focuses on the innovative development of ultra-intense and ultra-short lasers, the interaction between ultra-intense and ultra-short lasers and matter, and the frontier foundations in interdisciplinary and related high-tech fields. It is a very important scientific frontier field in science and even modern science. The research of precision spectroscopy in this field has made unprecedented breakthroughs in recent years. For quite a long time, the precise control research of time domain and frequency domain was divided into two different fields. Until the end of the 20th century, scientists began to study the frequency stabilization technolo...

Claims

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Application Information

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IPC IPC(8): H01S3/109G02F1/37G02F1/35
Inventor 韩晓红曾和平
Owner EAST CHINA NORMAL UNIV
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