Cascaded etalon filtering system and method for OPO mode selection

Abstract

The invention discloses a cascaded etalon filtering system and method for OPO model selection. A temperature controllable three-dimensional adjusting optical etalon is used as a filter device, and thetemperature of the etalon is adjusted to be resonant with the center frequency of an output light field of an optical parametric oscillator (OPO); wide-range filtering is realized by cascading a plurality of etalons with different thicknesses; through an optimized selection scheme of a thickness combination of the etalons, the sideband noise filtering range of the cascaded etalons reaches THz magnitude, and the bandwidth of a transmission spectrum at the center frequency is controlled to be hundred MHz magnitude; the system can be used as a general filtering system for OPO mode selection; a degenerate mode of the OPO is passed, and all the non-degenerate modes are filtered out, so that a filter and an optical cavity cannot be interfered by the narrowband, the cost and the experiment complexity are reduced; and furthermore, the thickness combination of the etalons is optimized, so that the filtering range reaches THz, all the non-degenerate modes of the OPO are covered, and the universality of the filtering system is improved.

Description

technical field [0001] The invention relates to the technical field of OPO mode selection filtering, in particular to a cascaded etalon filtering system and method for OPO mode selection. Background technique [0002] Optical parametric oscillator (optical parametric oscillator, OPO) is an important means of generating non-classical light fields. It can not only generate continuous variable quantum states such as squeezed state, cat state, and multi-component entanglement, but also generate narrow-band single photons. , Entangling photon pairs to separate variable quantum states, has important applications in fundamental physics research, quantum communication, quantum computing and other fields. Using an OPO cavity can effectively narrow the linewidth of the nonclassical light field, but the spectral range of the spontaneous parametric down-conversion process in the OPO cavity is very wide (~THz order), which is much larger than the free spectral region of the OPO cavity (~...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a cascaded etalon filtering system and method for OPO mode selection to solve the problems of high experimental complexity, high cost and low versatility of the existing OPO mode selection filtering system

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