Work

Highly sensitive double-grating interferometer for direct measurement of a neutral helium gas density in a capillary cell

Year: 2025

Type: article

Abstract: We developed a highly sensitive double-grating interferometer using four probe beams, which can measure one order of magnitude smaller phase shifts compared with other conventional interferometers. To achieve the unprecedented sensitivity, a highly dynamic 16-bit CCD camera was used and the balanced detection technique with four probe beams was employed in the 2-dimensional (2-D) interferometry for the first time. By using this interferometer, we could directly measure a low helium (He) gas density of n ≃ 1 × 10 17 cm −3 in a capillary gas cell for the laser-plasma acceleration research, which is almost impossible with other conventional laser interferometers. This interferometer may provide a new tool for applications with extremely small phase shifts in science.

Source: Optics Express

DOI: 10.1364/oe.562060

Authors: Kyungmin Roh, Youngmin Lee, Hyunil Benjamin Kim, Seongjin Jeon, Hyojeong Lee, Hyyong Suk

Language: English

Topic: Laser-Plasma Interactions and Diagnostics

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funder: National Research Foundation of Korea

Awards: G1498159564, G3117250449, G443970506