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A Coherent Detection Method With 106 Higher Intensity Response Sensitivity Than Normal Heterodyne Interferometry

Based on the Nd: YVO 4 microchip laser frequency-shifted feedback system, we carry out the detection of ultra-weak light signals, and verify that the response limit of the proposed system can reach 0.5 photon per second (corresponding to 2.1 × 10 −7 photon's energy per frequency modulation cycle of 0.42 μs), with approximately linear response to weak light. Then, the system is compared with the traditional Mach-Zehnder heterodyne interference system, the comparison results confirm the higher intensity response sensitivity of the laser feedback technology (about six orders of magnitude) when detecting both cooperative and non-cooperative targets. On this basis, a verification experiment is carried out on long-distance weak light imaging, and the “THU” pattern made of unpolished aluminum blocks is successfully reconstruct at 60 m distance (with an additional 10 −7 attenuation provided by the neutral density filter added to the optical path). During the imaging process, the response energy as low as 2 × 10 −5 photon is achieved in each frequency modulation cycle of 0.42 μs. The successful implementation of the laser frequency-shifted feedback detection enables an anti-disturbance and sensitive coherent method in weak light signals detection.

Ketersediaan

Informasi Detail

Judul Seri

JOURNAL OF LIGHTWAVE TECHNOLOGY; Vol.40 No.14 July 15 2022

No. Panggil

-

Penerbit

: .,

Deskripsi Fisik

p. 4649-4654

Bahasa

English

ISBN/ISSN

-

Klasifikasi

NONE

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

GAIN MEASUREMENT
LASER APPLICATIONS
LASER FEEDBACK

Info Detail Spesifik

DOI: 10.1109/JLT.2022.3169803

Pernyataan Tanggungjawab

Mingwang Tian, Mingfang Li, Xin Xu, ZiYu Hua, Yidong Tan

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