High brightness application of orange fiber laser for photocoagulator

J. Nakanishi; J. Suzuki; K. Ito; K. Kojima; M. Adachi; T. Yamada; T. Ueno; K. Hayashi

doi:10.1117/12.808631

18 February 2009 High brightness application of orange fiber laser for photocoagulator

J. Nakanishi, J. Suzuki, K. Ito, K. Kojima, M. Adachi, T. Yamada, T. Ueno, K. Hayashi

Proceedings Volume 7163, Ophthalmic Technologies XIX; 71631P (2009) https://doi.org/10.1117/12.808631
Event: SPIE BiOS, 2009, San Jose, California, United States

Abstract

We developed an orange fiber laser as the light source for an ophthalmic photocoagulator with superior beam quality and focusing ability. An optical system was also fabricated to verify the spot size of the newly developed laser. It is a simple optical system without the zoom lenses of a conventional delivery system. The laser focal spot has a diameter of 6.8 μm as measured by the knife-edge method. We verified that the laser spot could be reduced to less than that of conventional systems by removing optical system aberrations using wavefront analysis and knife-edge method. However, the effect of laser irradiation cannot be verified with a conventional observation system of photocoagulator. Therefore, we fabricated a laser irradiation device to examine micro spots by modifying an optical microscope. We used our unique pseudo-biological tissue to verify the effect of high-brightness laser irradiation on a human eye. The pseudobiological tissue is comprised of albumin and human gelatin. The laser irradiation caused coagulation and heat denaturation to the pseudo-biological tissue. We evaluated the relationship of the irradiated area with the power intensity and irradiation time. As a result, the coagulation spot size was only slightly dependent on power intensity and irradiation time while the heat denaturation size was strongly dependent on them, especially on irradiation time. The effects of highbrightness laser irradiation will be thermally analyzed in a future paper.

Citation Download Citation

J. Nakanishi, J. Suzuki, K. Ito, K. Kojima, M. Adachi, T. Yamada, T. Ueno, and K. Hayashi "High brightness application of orange fiber laser for photocoagulator", Proc. SPIE 7163, Ophthalmic Technologies XIX, 71631P (18 February 2009); https://doi.org/10.1117/12.808631

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
8 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Laser irradiation

Zoom lenses

Fiber lasers

Laser tissue interaction

Laser development

Laser coagulation

Tissues

Show All Keywords

Keywords/Phrases

Search In:

Publication Years