CN-122016060-A - Beam splitting synchronization assembly for single-shot autocorrelation instrument and single-shot autocorrelation instrument

CN122016060ACN 122016060 ACN122016060 ACN 122016060ACN-122016060-A

Abstract

A beam splitting synchronization assembly for a single-shot autocorrelation instrument and the single-shot autocorrelation instrument relate to the technical field of laser pulse measurement. The beam splitting synchronization assembly includes a dihedral mirror. The dihedral angle reflector comprises a first reflecting surface and a second reflecting surface which are intersected, wherein a coating film based on a metal material is arranged on the surface of the first reflecting surface and the surface of the second reflecting surface, laser to be measured is incident to a ridge line of the dihedral angle reflector, is emitted into first beam splitting laser after passing through the first reflecting surface, is emitted into second beam splitting laser after passing through the second reflecting surface, and an angular bisector of an included angle between the propagation direction of the first beam splitting laser and the propagation direction of the second beam splitting laser is perpendicular to an incident optical axis of the laser to be measured. The beam splitting synchronization assembly does not need additional time synchronization mechanisms such as delay lines and the like, and can ensure the characteristic that the laser to be detected is almost zero in the bandwidth range by arranging the coating film based on the metal material, thereby avoiding introducing additional material dispersion and angular dispersion when the laser to be detected is split and synchronized.

Inventors

Ning Xiaonan
YANG TAO
GUO BO
CHEN JIUCHENG

Assignees

北京量子信息科学研究院

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (10)

1. A beam splitting synchronization assembly for a single-shot autocorrelation instrument, comprising: the dihedral angle reflector comprises a first reflecting surface and a second reflecting surface which are intersected, wherein the surfaces of the first reflecting surface and the second reflecting surface are respectively provided with a coating film based on a metal material; the laser to be measured is incident to the ridge line of the dihedral angle reflector, passes through the first reflecting surface and then is emitted to form first beam splitting laser, and passes through the second reflecting surface and then is emitted to form second beam splitting laser; and an angular bisector of an included angle between the propagation direction of the first beam-splitting laser and the propagation direction of the second beam-splitting laser is perpendicular to an incident optical axis of the laser to be measured.
2. The beam splitting synchronization assembly according to claim 1, wherein in a case where a ridge line of the dihedral angle mirror is arranged vertically, an incident optical axis direction of the laser light to be measured is perpendicular to the ridge line, and the first beam splitting laser light and the second beam splitting laser light propagate in a horizontal plane.
3. The beam splitting synchronization assembly of claim 1, wherein an optical axis of the laser light to be measured is located at an angular bisector of the first reflecting surface and the second reflecting surface with a ridgeline of the dihedral angle reflector being disposed horizontally, the first beam splitting laser light and the second beam splitting laser light propagating in a vertical plane.
4. The beam-splitting synchronization assembly of claim 1, wherein the metallic material of the metallic material-based coating is one of gold, silver, aluminum, or copper.
5. A single-shot autocorrelation instrument comprising the beam-splitting synchronization assembly of any one of claims 1-4, the single-shot autocorrelation instrument further comprising: an autocorrelation signal generating unit disposed in a region where the first and second split lasers generate an autocorrelation signal, for generating an autocorrelation signal; The signal transmission detection assembly is arranged on a preset propagation path of the autocorrelation signal and is used for receiving the autocorrelation signal, imaging the autocorrelation signal to a target imaging plane, and outputting a two-dimensional image corresponding to the autocorrelation signal on the target imaging plane so as to determine the pulse width of the laser to be detected according to the two-dimensional image.
6. The single-shot autocorrelation instrument of claim 5 wherein the autocorrelation signal generating assembly comprises: a nonlinear crystal disposed in a region where the first and second split lasers generate an autocorrelation signal for generating an autocorrelation signal; And the optical filter is used for screening the autocorrelation signals.
7. The single-shot autocorrelation instrument of claim 5 wherein the signal transfer detection assembly comprises: an achromatic lens for imaging the autocorrelation signal at a preset imaging magnification to a target imaging plane; the small-hole filter plate is arranged behind the achromatic lens and is used for filtering residual scattered fundamental frequency light of the autocorrelation signal; the bias selector is rotatably arranged on a preset propagation path of the autocorrelation signal and is arranged behind the small-hole filter to adjust the intensity of the autocorrelation signal; The area array detector is arranged on the target imaging plane behind the polarization selector and is parallel to the polarization selector, and the autocorrelation signals output by the polarization selector are output as the two-dimensional image.
8. The single-shot autocorrelation instrument of claim 5, the single-shot autocorrelation instrument is characterized by further comprising: An optical path collimating assembly comprising: the first diaphragm is arranged on the incident path of the laser to be detected and is used for aligning the incident position of the laser to be detected; the beam splitting rear guide lens is arranged on the propagation path of the first beam splitting laser and is used for receiving the first beam splitting laser and adjusting the propagation direction of the first beam splitting laser; The second diaphragm is arranged on the adjusted propagation path of the first beam-splitting laser and is used for aligning the propagation position of the first beam-splitting laser.
9. The single-shot autocorrelation instrument of claim 5, the single-shot autocorrelation instrument is characterized by further comprising: and a baffle plate provided on the propagation path of the second split laser beam.
10. The single-shot autocorrelation instrument of claim 5, the single-shot autocorrelation instrument is characterized by further comprising: the shell is arranged outside the beam splitting synchronization assembly, the autocorrelation signal generating assembly and the signal transmission detection assembly in a surrounding mode.

Description

Beam splitting synchronization assembly for single-shot autocorrelation instrument and single-shot autocorrelation instrument Technical Field The application relates to the technical field of laser pulse measurement, in particular to a beam splitting synchronization assembly for a single-shot autocorrelation instrument and the single-shot autocorrelation instrument. Background The femtosecond laser pulse has ultra-short pulse width and ultra-high peak power. The accurate measurement of pulse width is the key when using femtosecond laser pulse, and the single shot autocorrelation instrument is classical pulse width measuring equipment, and its measuring speed is fast, need not reference light, simple structure, obtains extensively to favor. The existing femtosecond laser pulse single-shot autocorrelation instrument generally adopts a flat beam splitter or a prism to realize laser beam splitting, and in the beam splitting process, an optical glass material can be penetrated, new dispersion components are introduced into laser to be measured, so that the pulse width of the laser to be measured when the laser to be measured acts in a nonlinear crystal is changed, and the measurement result is influenced. For example, a spectroscope or a flat beam splitter is used for splitting light, the transmission part penetrates through the glass of the lens substrate to introduce additional dispersion, the double-beam dispersion is different and the pulse width is different, various prisms are used for splitting the laser pulse to be detected, and the generated double-beam laser penetrates through the glass material with wedge angle and introduces additional material dispersion and angular dispersion. The extra chromatic dispersion introduced by the measuring method has serious influence on the measuring result and greatly influences the accuracy of the measuring result when the measuring pulse width is extremely short, a few cycles which are extremely sensitive to chromatic dispersion or even a nearly single cycle laser pulse width. The matters in the background section are only those known to the public and do not, of course, represent prior art in the field. Disclosure of Invention The application aims to provide a beam splitting synchronization assembly for a single-shot autocorrelation instrument and the single-shot autocorrelation instrument, so as to overcome the defect that the existing femtosecond laser pulse single-shot autocorrelation instrument introduces extra chromatic dispersion to influence measurement accuracy. According to one aspect of the present application, there is provided a beam splitting synchronization assembly for a single shot autocorrelation instrument, the beam splitting synchronization assembly comprising a dihedral corner mirror. The dihedral angle reflector comprises a first reflecting surface and a second reflecting surface which are intersected, wherein a coating film based on a metal material is arranged on the surface of the first reflecting surface and the surface of the second reflecting surface, laser to be measured is incident to a ridge line of the dihedral angle reflector, is emitted into first beam splitting laser after passing through the first reflecting surface, is emitted into second beam splitting laser after passing through the second reflecting surface, and an angular bisector of an included angle between the propagation direction of the first beam splitting laser and the propagation direction of the second beam splitting laser is perpendicular to an incident optical axis of the laser to be measured. According to some embodiments of the present application, in a case where a ridge line of the dihedral corner reflector is disposed vertically, an incident optical axis direction of the laser light to be measured is perpendicular to the ridge line, and the first split laser light and the second split laser light propagate in a horizontal plane. According to some embodiments of the present application, in a case where the ridge line of the dihedral corner reflector is disposed horizontally, the optical axis of the laser light to be measured is located at the angular bisectors of the first reflecting surface and the second reflecting surface, and the first split laser light and the second split laser light propagate in the vertical planes. According to some embodiments of the application, the metal material of the plating film based on the metal material is one of gold, silver, aluminum or copper. According to an aspect of the present application, there is provided a single-shot autocorrelation apparatus comprising a beam-splitting synchronisation assembly as described above, the single-shot autocorrelation apparatus further comprising an autocorrelation signal generating assembly and a signal transfer detection assembly. The signal transmission detection component is arranged on a preset propagation path of the autocorrelation signal and is used for receiving the autocorrelati