Photoionization device for measuring absolute phase of carrier envelope of optical pulse

A pulse carrier and absolute phase technology, applied in the laser field, can solve the problem of not giving the absolute phase of the carrier envelope of the optical pulse, and achieve the effect of compact structure, high sensitivity and precision

Inactive Publication Date: 2010-10-13
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But none of these methods gives the absolute phase of the carrier envelope of the optical pulse

Method used

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  • Photoionization device for measuring absolute phase of carrier envelope of optical pulse
  • Photoionization device for measuring absolute phase of carrier envelope of optical pulse

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0016] A specific embodiment is used below to further illustrate the present invention.

[0017] Measure the carrier envelope phase of a 5fs laser pulse with a center wavelength of 780nm.

[0018] Such as figure 1 As shown, the detection cavity 3 is a 120mm×120mm×120mm cube. The six-sided center of the cube is processed with a flange interface. The top flange interface is connected to the air intake system. The flange interfaces on the left and right sides are connected to the microchannel board detector 6. The front end is connected to a quartz window. The rear end is connected to the quartz window and the mechanical pump 9 through a three-way connection. The bottom flange is connected to the molecular pump 10. In order for the microchannel plate detector 6 to work normally, the vacuum degree of the detection chamber must reach 10 -6 Torr. This device uses 70 liters, 1500 rpm molecular pump 10, the vacuum degree can reach 10 -7 Torr. The air intake system at the top is equ...

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PUM

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Abstract

The invention discloses a photoionization device for measuring an absolute phase of a carrier envelope of an optical pulse, comprising a gas intake system, a vacuum cavity, a pump unit and a signal acquisition card, wherein the vacuum cavity is connected with the pump unit and comprises a detection cavity and a reaction cavity; the reaction cavity is positioned in the center of the detection cavity; light beams are focused into the reaction cavity, a gas is ionized under the action of an optical field, and photoionization electrons are reversely ejected through small holes positioned at both sides of the reaction cavity; the detection cavity is connected with two microchannel plate detectors, and the ejected photoionization electrons respectively fly to respective microchannel plate detectors and form pulse currents on the microchannel plate detectors; and signals of the pulse currents are recorded by the signal acquisition card so as to compute the carrier envelope phase of an ultrashort laser pulse. The invention can measure the carrier envelope phase by utilizing the reverse symmetry of photoionization and has compact structure and high sensitivity and accuracy.

Description

Technical field [0001] The invention belongs to the field of laser technology, and specifically relates to a device for measuring the absolute phase of the carrier envelope of an ultrashort laser pulse. Background technique [0002] After the emergence of mode-locking technology, pulsed lasers have become a major type of lasers. Potential applications of ultrashort pulses include chemical reaction control, high-speed electronic measurement, optical communications, biomedicine, material processing, and time measurement. In recent years, laser pulses have been developing towards wider spectrum and shorter pulse width. For ultrashort pulses, especially pulses with less than two optical periods, the time change of the optical field is closely related to the phase of the optical pulse carrier envelope. Therefore, when the strong laser and matter depend on the field strength, the attosecond pulse is generated , And other fields, the information of the absolute phase of the carrier en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J11/00G01J9/00
Inventor 邓勇开刘运全龚旗煌
Owner PEKING UNIV
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