New Ocular Hazard of Mode Locking in CW Lasers

Article metrics


IN a series of experiments to investigate threshold retinal damage produced by CW helium–neon lasers (wavelength = 632.8 nm), we have found that lasers with identical beam divergence and output powers but different amplifier/cavity parameters produce different amounts of retinal damage. The source of this discrepancy has been traced to mode locking in one of the lasers used.

Access options

Rent or Buy article

Get time limited or full article access on ReadCube.


All prices are NET prices.


  1. 1

    Marshall, J., and Mellerio, J., Exp. Eye Res., 6, 4 (1967).

  2. 2

    Bergqvist, T., Kleman, B., and Tengroth, S., Acta Ophthalmol., 44, 853 (1966).

  3. 3

    Vassiliadis, A., Rosan, R. C., Peabody, P. R., Zweng, H. C., and Honey, R. C., Stanford Research Institute, Report for USAF, No. Af 33 (615)–3060 (1966).

  4. 4

    Marshall, J., and Mellerio, J., Exp. Eye Res., 7, 225 (1968).

  5. 5

    Code of Practice for Laser Systems (Ministry of Technology, 1969).

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Cite this article

SMART, D., MANSON, N., MARSHALL, J. et al. New Ocular Hazard of Mode Locking in CW Lasers. Nature 227, 1149–1150 (1970) doi:10.1038/2271149a0

Download citation

Further reading


By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.