Frequency-Stable Non-Planar Ring Laser — Integrity Review

Academic fraud report · Geng Detector

Summary

This report assesses the article “Frequency-Stable Non-Planar Ring Laser” by Feng Tao, Zhang Xuejie, Ren Zhiyuan, Sun Mingying, and Zhu Jianqiang, published in Acta Optica Sinica in 2013, DOI 10.3788/AOS201333.1014001. The verdict is “clean,” meaning that the available evidence does not reveal a clear indication of academic misconduct. The reported operating parameters are internally coherent: the stated threshold is approximately 190 mW, and an output of 1.254 W at 2.58 W pump power yields a two-point slope efficiency of about 52.5%, reasonably close to the reported 51.5%. A small discrepancy is plausible because the published slope efficiency is likely based on a multi-point least-squares fit and may be affected by thermal effects. Equipment-model and publication-timeline checks also found no obvious anachronism among the cited instruments. However, the review was constrained by the absence of high-resolution source figures; pixel-level duplication, splicing, and image-tampering analyses could not be completed. The overall conclusion therefore has moderate confidence and is based on the supplied text, numerical checks, and timeline review rather than a full forensic examination.

Verdict

Clean based on the available evidence. No clear indication of academic misconduct was identified. This assessment has moderate confidence because the original figures were unavailable for detailed image-level inspection.

The article is “Frequency-Stable Non-Planar Ring Laser”, published in *Acta Optica Sinica* in 2013. DOI: 10.3788/AOS201333.1014001.

Key findings

The reported experimental values are internally plausible.
The stated threshold of approximately 190 mW and maximum output of 1.254 W at 2.58 W pump power give a two-point slope efficiency of approximately 52.47%, rounded to 52.5%.
This is close to the reported slope efficiency of 51.5%. The small difference is compatible with a fit using multiple data points, experimental uncertainty, and possible high-power thermal effects.
No chronological inconsistency was identified for the cited equipment, including Thorlabs SA200-8B, Spiricon SP620U, HighFinesse WS6-200, and Agilent N9320A, relative to the manuscript’s receipt date in 2013.
The cited foundational work, including Kane and Byer (1985), was not reported as anachronistic.
Pixel-level reuse, image splicing, and Photoshop-tampering checks were not completed because high-resolution copies of the figures were unavailable.
Western-blot-type image checks, terminal-digit analysis, and p-hacking analysis were not applicable or could not be meaningfully performed on the supplied material.

Evidence highlights

Numerical cross-check:

51.5%

1.0 percentage point

Interpretation: The discrepancy is not, by itself, evidence of fabrication. The report indicates that the published value was likely obtained from a multi-point least-squares fit rather than calculated solely from the maximum-power point.
Scope limit: The evidence supports consistency of the stated parameters, not independent verification of the underlying experimental records, raw data, or figure provenance.

Notes

The conclusion should be understood as a limited screening result rather than a definitive forensic certification. No action is recommended on the basis of the supplied material. A professional institutional investigation would be required for a final finding, and the absence of detectable issues does not establish that misconduct could not have occurred.