DSH 656 Equivalent measurement setup for the Condition 1 for certain laser beams

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DSH 656 ) j* `" q9 G) I& Q   Q# D9 z2 F' V

Equivalent measurement setup for the Condition 1 for certain laser beams " Q! X7 @" [7 j5 N2 k

Clause 9.1 Tests Clause 9.2 Measurement of laser radiation Clause 9.3 Measurement geometry

60825-1(ed.1);am1;am2 & 60825-1(ed.2) 8 A; P# M4 z- p# B4 B% S

& t8 A! F0 q# d2 q+ LStandard(s):
1 n* L0 V/ K7 W- T9 DIEC 60825-1, Ed 1.2 (2001) & Ed 2.0 (2007)
# F& y3 K4 _+ e* @Sub clause(s):
Clause 9.1 Tests
$ k( v2 i- U, ?8 |9 d3 AClause 9.2 Measurement of laser radiation
Clause 9.3 Measurement geometry
Decision Sheet n°: DSH 656
) I5 h/ X& \% B+ s6 zSubject: Equivalent measurement setup for the Condition 1 for certain laser beams
( ]7 \% |9 @* P, L' I9 v. uKey words:
4 N" l! e* Q& c  E3 S- Condition 1
- Telescoping viewing
- Aperture stop
3 H' S8 i2 a5 s4 I& pApproved by the 45th CTL Plenary meeting 2008
2 e& q/ k& z; Y5 k2 N+ t0 gQuestion:
Is it necessary to always use a 50 mm aperture stop in order to fulfil the requirements for the measuring Condition 1?
' m# c, u5 [" ?4 n3 v0 ~Decision:
$ S: H; H/ [; c  \7 D9 E- R  V% DIf the laser beam is well collimated so that the entire radiant power is passing through a 7 mm aperture within 2000 mm distance, it is acceptable to use a 7 mm aperture stop for the purpose of testing according to Condition 1.
5 ]6 K) O1 ?" CNote: National Certification Bodies shall provide objective evidence that the whole laser beam is captured with the reduced aperture size.
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