LT2006041A - Method and device for focusing error detection - Google Patents

Method and device for focusing error detection

Info

Publication number
LT2006041A
LT2006041A LT2006041A LT2006041A LT2006041A LT 2006041 A LT2006041 A LT 2006041A LT 2006041 A LT2006041 A LT 2006041A LT 2006041 A LT2006041 A LT 2006041A LT 2006041 A LT2006041 A LT 2006041A
Authority
LT
Lithuania
Prior art keywords
focusing error
light beam
material surface
error detection
rotation angle
Prior art date
Application number
LT2006041A
Other languages
Lithuanian (lt)
Other versions
LT5479B (en
Inventor
Kęstutis REGELSKIS
Valerijus SMILGEVIČIUS
Gediminas RAČIUKAITIS
Original Assignee
Fizikos Institutas
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fizikos Institutas filed Critical Fizikos Institutas
Priority to LT2006041A priority Critical patent/LT5479B/en
Publication of LT2006041A publication Critical patent/LT2006041A/en
Publication of LT5479B publication Critical patent/LT5479B/en

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Abstract

The invention relates to optical technologies and is intended to methods and devices for the focusing error detection when the coherent light beam is directed to the material surface and focused into it and is based on registration of the intensitydistribution of the said light beam reflected from the surface. The coherent light beam to be registered is transformed to optical vortex whose intensity distribution is modulated in azimuth direction, and the focusing error is estimated from the rotation angle of the optical vortex relative to the initial azimuth coordinate which corresponds to the exact focal position of the objective on the said material surface. Then the value of the rotation angle depends on deviation from the exact focus position off the material surface.
LT2006041A 2006-05-29 2006-05-29 FOKUSAVIMO KLAIDOS NUSTATYMO BuDAS IR IRENGINYS LT5479B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
LT2006041A LT5479B (en) 2006-05-29 2006-05-29 FOKUSAVIMO KLAIDOS NUSTATYMO BuDAS IR IRENGINYS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LT2006041A LT5479B (en) 2006-05-29 2006-05-29 FOKUSAVIMO KLAIDOS NUSTATYMO BuDAS IR IRENGINYS

Publications (2)

Publication Number Publication Date
LT2006041A true LT2006041A (en) 2007-12-27
LT5479B LT5479B (en) 2008-03-26

Family

ID=38814651

Family Applications (1)

Application Number Title Priority Date Filing Date
LT2006041A LT5479B (en) 2006-05-29 2006-05-29 FOKUSAVIMO KLAIDOS NUSTATYMO BuDAS IR IRENGINYS

Country Status (1)

Country Link
LT (1) LT5479B (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58200442A (en) 1982-05-19 1983-11-22 Ricoh Co Ltd Focus detection device of optical pickup, or the like
JPS5933643A (en) 1982-08-17 1984-02-23 Mitsubishi Electric Corp Optical pickup

Also Published As

Publication number Publication date
LT5479B (en) 2008-03-26

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Effective date: 20110529