Device and method for generating light field in vacuum squeezed state

Abstract

The invention discloses a vacuum squeezed state light field generation device and method. The device comprises a laser, an optical parametric oscillator, a frequency shifting device, a temperature control device, a lock cavity device, a half wave plate, a first polarized light beam splitter, a second polarized light beam splitter and a dichroic mirror. Due to the frequency shifting device, rapid frequency shifting of continuous single-frequency laser can be achieved, fill-in light is obtained, and the broadcasting direction of the laser cannot be changed; fill-in light passes through the optical parametric oscillator to obtain fill-in light with cavity information, the lock cavity device can generate a lock cavity signal according to the fill-in light with the cavity information and perform cavity length locking on the optical parametric oscillator, the temperature control device can achieve precise temperature control over crystals, and the optical parametric oscillator works in the degenerate state. By adopting the device or method, the problem that seed light is injected or a triply resonant optical parametric oscillator must be adopted can be avoided, the mechanical stability of the optical parametric oscillator is maintained, and therefore the stably-output vacuum squeezed state light field is obtained.

Description

technical field [0001] The invention relates to the field of optics, in particular to a device and method for generating a vacuum squeezed light field. Background technique [0002] It is a relatively mature and effective method to prepare a continuous variable quantum vacuum compression source by using a sub-threshold Optical Parametric Oscillator (OPO for short). Vacuum compression sources are usually obtained by using type I phase-matched degenerate OPOs. When the degenerate OPO operates below the threshold, the average field of the generated signal light and idle light is zero, that is, the output of the degenerate OPO is a vacuum compression source at this time. [0003] When the cavity length of the OPO cavity is not controlled, the external mechanical disturbance will affect the generation and use of the vacuum compression source. The usual technology to lock the cavity length of the OPO cavity needs to inject a weak seed light with the same polarization as the vacu...

AI Technical Summary

Problems solved by technology

However, the pump light of the triple-resonance OPO will resonate in the cavity. At this time, the requirements on the parameters of the OPO cavity, such as temperature and crystal length, will be more stringent, and it is difficult to achieve stable operation.

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