Recent trends in the international and domestic standardization activities on active opto-electronic devices andcomponents are described. Standards published during more than 20 years of such activities, and currenttopics discussed in the standardization group are summarized. International organization of IEC and ISO havebeen working efficiently in this field, and JIS promotes harmonization of its standard with international ones.It was pointed out that, throughout the constant contribution to the work, the leadership of Japanese membersin this field of activities becomes much important.

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Since 1960, lasers have been used in various applications. However, the laser standards have been persued inIEC and ISO without any contact between them. IEO 's territory is related to diode laser and ISO 's territory isfor gas/solid lasers. Recently, as diode laser technology is greatly improved and the laser power increases, it 's application fields are overlapped with gas/solid lasers. However, there is a slight difference between twostandards and it has become urgently necessary to harmonise these two standards. This paper describes circumstancesof this harmonisation activity.

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Laser optical components for ultra violet, visible, near infrared and infrared region are standardized. Qualityof the materials (birefringence, bubbles, inclusions and striae), the manufacturing tolerance (surface figureerror, decentering and scratch) and dimensional tolerance are standardized. Their coded name is also standardized.Methods of measurement of transmittance, reflectance, absorptance and scattering are going to be standardized.Test methods of laser damage threshold for both 1 on 1 and s on 1 test are also going to be standardized. Their methods and the status of the standardization are described.

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At present, many kinds of laser materials processing, such as laser welding, drilling, cutting and marking, areused in major industries such as automobiles, airplanes, electronics, atomic power, ship and iron and steelindustries. International standardization in this field has been promoted by the leadership of European countriesas represented by CEN. After consideration of these standards and investigaton of applications andmarket of laser welding and cutting in Euorpean countries, North America and Japan in the last decade, it isconcluded that the international standards and specifications by CEN on laser welding and cutting are insufficient.Therefore, Japan Internatinal Standards Committee (=JISC) has carried out a 3-year national projectfor the development of new proposal drafts for ISO since 1997. Laser International Standard Committee (=LIS) of Japan Welding Engineering Society has developed recently three proposal drafts on laser welding andcutting for new work items to ISO/TC44 under the project. Followed by this, JISC has made the internationalproposals as a new work item to ISO/TC44. As a result, all of them have been accepted in this year (2001).

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The present paper describes experimental results of the high power laser welding characteristics of hot steelsamples. Using laser induced plasma as a secondary heat source, the penetration depth of 1000°C steelsamples improve about 30% compared to that of room temperature samples. The maximum depth is 38mmat lm/min welding velocity using 40 kW power. A beam weaving method is adopted to enlarge bead width without degrading fusion efficiency. It is also effective for suppressing bead depth deviation.

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