Spectral phase interference device and system

A spectral phase interference device, wherein said device comprises:

• a beam splitter configured to split a pulse to be measured into a reflected pulse and a transmitted pulse, wherein said reflected pulse is incident to a pulse retarder and said transmitted pulse is incident to a pulse disperser;
• said pulse disperser is configured to spread said transmitted pulse into a chirped pulse that is incident to a half-wave plate;
• said half-wave plate is configured to adjust a polarization direction of said chirped pulse that is incident to a polarizing beam splitter after transmitting through said half-wave plate;
• said pulse retarder is configured to delay said reflected pulse, wherein the delayed reflected pulse is incident to a birefringent crystal;
• said birefringent crystal is configured to allow said delayed reflected pulse to generate a pulse pair to be measured with a relative time delay, wherein said pulse pair to be measured is incident to a broadband quarter-wave plate;
• said broadband quarter-wave plate is configured to adjust said pulse pair to be measured to allow a phase difference p between relative phases of the two sub-pulses in said pulse pair to be measured to be generated, wherein said pulse pair to be measured which has phase difference π is incident to said polarizing beam splitter;
• said polarizing beam splitter is configured to allow said pulse pair to be measured which has phase difference π and said chirped pulse that has transmitted through said half-wave plate to be incident to a focusing lens at the same time;
• said focusing lens is configured to focus the chirped pulse that is transmitted through said half-wave plate and said pulse pair to be measured that has generated the phase difference π, wherein said focused pulse is incident to a sum-frequency pulse generator;
• said sum-frequency pulse generator is configured to apply sum-frequency conversion to said focused pulse, to generate a sum-frequency pulse pair that is incident to a spectrometer;
• and
• said spectrometer is configured to record spectral interference ring data generated by said sum-frequency pulse pair.