Remote digital holography using a repeater laser for reference beam generation

We propose a repeater laser (RL) method to generate a reference beam with low relative frequency instability and stable optical power for remote digital holography (DH), in which a measurement target is large scale such as the atmosphere or laid optical fibers. An RL, a laser phase-locked to a signa...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2021-11, Vol.60 (12), p.122004
Main Authors: Sakuma, Hiroki, Imai, Hiromitsu, Arai, Kaoru, Sugiyama, Ryuta, Akatsuka, Tomoya, Oguri, Katsuya, Miyamura, Takashi
Format: Article
Language:English
Subjects:
Digital holography
Frequency stability
Holography
Lasers
Optical fibers
Optical frequency
Phase distribution
Phase synchronization
Spatial light modulators
Wave fronts
Wavefront measurement
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Summary:We propose a repeater laser (RL) method to generate a reference beam with low relative frequency instability and stable optical power for remote digital holography (DH), in which a measurement target is large scale such as the atmosphere or laid optical fibers. An RL, a laser phase-locked to a signal beam, plays the role of a repeater of the optical frequency, and a beam from it is used as a reference beam. As a proof of principle, we experimentally demonstrate wavefront measurements using a phase-only spatial light modulator as a measurement target with known phase distribution. Results show that the remote DH using the RL method achieves the same measurement accuracy as local DH.
ISSN:0021-4922
1347-4065
DOI:10.35848/1347-4065/ac3183