A device and method for accurately measuring the dissociation energy of ultracold molecules

Abstract

The invention belongs to the technical field of measurement of ultra-cold molecule energy grades and provides a device and method for accurately measuring ultra-cold molecule dissociation energy. Thedevice comprises a first laser device, a second laser device, a femtosecond optical frequency comb, a first light splitting plain sheet, a second light splitting plain sheet, an optical grating, a detector and a frequency spectrograph, wherein first laser emitted by the first laser device and second laser emitted by the second laser device pass through the first light splitting plain sheet respectively and are overlapped to form first overlapping light and second overlapping light; the first overlapping light is emitted into an ultra-cold molecule sample tank, and the second overlapping lightand light emitted by the femtosecond optical frequency comb pas through the second light splitting plain sheet and are overlapped to form third overlapping light (14), and beat frequency is generated;and a beat frequency signal is detected by the detector and then is sent to the frequency spectrograph. According to the device provided by the invention, rapid and accurate measurement of ultra-coldvibration-rotation based molecule dissociation energy can be realized.

Description

technical field [0001] The invention belongs to the technical field of ultracold molecular energy level measurement, and in particular relates to a device and method for accurately measuring molecular dissociation energy. Background technique [0002] In recent years, ultracold molecules have played a huge role in precision measurement, quantum computing, and many-body problems due to their unique characteristics such as rich vibrational energy level structure and long coherent interaction time in the ground state. [0003] In ultracold molecular-based applications, the preparation of ultracold vibrational ground state molecules is a key step. The initial state molecules prepared in the experiment are excited state molecules, which need to be transferred to the ground state by a suitable method. The commonly used method is the stimulated Raman adiabatic transfer method, such as figure 2 As shown, the first excitation light resonates with the ground state |E1> and the excite...

AI Technical Summary

Problems solved by technology

Due to the complexity of molecules compared to atomic structures, accurate theoretical calculations of energy level data are more difficult

In the experimental precise measurement of the internal structure of ultracold molecules, limited by the limitations of the accuracy of experimental measuring instruments, the highest limit of measurement accuracy is the accuracy of the wavelength meter (20MHz), and more accurate experimental measurement is not easy to achieve

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