4 7 adp v kdp
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4.7 ADP và KDP.

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4.7 ADP và KDP

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4 7 adp v kdp

4.7 ADP v KDP

ADP v KDP l nhng tinh th u tin c s dng cho vic th hin cc pha ca SHG. V sau ny chng c s dng trong nhiu lnh vc khc nhau, rng ri nht l trong lnh vc vt liu quang in. Chng u l tinh th 1 trc, vi vng nh sng truyn qua t vng cc tm n hng ngai gn vo khong 2000 angstron n 1.5 micromet .Chng thuc vo nhm 42m, l cc nhm i xng t gic.

Ln u tin, cc tinh th ny c xem nh l cc cht in p v c s dng trong cc my siu m. Kch thc cu cc tinh th ADP ny vo khong 10cm, cc tinh th ny c s dng do chng c tnh cht quang rt tt v gi thnh rt r.


4 7 adp v kdp

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http://myyagy.com/mientay/

Dch ti liu trc tuyn min ph:

http://mientayvn.com/dich_tieng_anh_chuyen_nghanh.html

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http://mientayvn.com/OCW/MIT/Co.html

Lin h vi ngi qun l trang web:

Yahoo: [email protected]

Gmail: [email protected]


4 7 adp v kdp

KDP c cu trc vng chc. Nhng trong qu trnh nung nng vi nhit khong 125oC v sao cho lm lnh lin th n c khuynh hng b rn nt.

Nhng cht c tnh tng t vy c s dng trong quang phi tuyn th c xem l nh ng dng cu KDP, v d nh l KD4P. Mt s ng dng khc th cng c s dng, mc d tnh chit quang cu chng ph thuc vo nhit ti khong 90oC v s tng tc gia cc phn t.

Cc thuc tnh c trng ca ADP v KDP thng nm trong 2 nhn t chnh: Vt cht c tnh tr khng ng k, v n gy hi cho nhng laser c mt nng lng ln; v gy thit hi trong vic thay i chic quang xy ra khi sng dch chuyn t vng nng lng thp ln vng c nng lng cao.


4 7 adp v kdp

Bn cnh nhng thun li trn th nhng vt cht c vng hng ngoi ngho l do s c mt ca cc nguyn t hydrogen trong cu trc cu chng, v khi cc ch s chic quang cu chng th kh thp khong 1.5 n 1.55.

v vy m h s phi tuyn nh. Trong nhm im 42m th c 3 h s khc 0 l d14, d25, v d36. y hai h s u c c l do s cn bng ca tinh th i xng, v ci cn li tun theo s cn bng do tnh i xng Kleinman. iu ny rt ph hp vi kt qu thc nghim.

Cc h s phi tuyn cu ADP v KDP c o mt cch t m, V ti nhit phng chng c gi tr nhbng 4.3. Ngoi ra nhng h s ny cn c th c tnh t phng trnh Sellmeier


4 7 adp v kdp

Vi A,B,C,D l nhng hng s. T h s chic quang ph thuc vo nhit , cc thuc tnh ny c o trong mt phng x-y, vi s hp pha ti bc sng 5145 angstron khi dng laser ion Agonkch thch vo ADP v KDP vi tn s kp vo khong 2572 angstron. Chi tit v s ph thuc vo nhit ca cc h s c nghin cu bi Adams v Barret v Phillip.

Cc h s chic quang tng khi tinh th b ng lnh.


4 7 adp v kdp

4.8 LITHIUM IODATE(LiIO3)

LiIO3 c tm thy nm 1969 bi 2 ngi c l Nath v Haussuh trong khi h ang nghin cu v alpha iodate axit(HIO3). LiIO3 to ra s thun li ln i vi vic nghin cu HIO3 v vic n nh cc my mc trong vng nhit rng 20-256. v n hon ton t do trong mi trng phng th nghim. Chng thuc nhm im th 6 v cc tinh th ny khng n trc. Nhng thng tin ny c trnh by nh bng 4.6..


4 7 adp v kdp

Nhng cu trc trong LiO3 tn ti l do s kt hp cu cc h s phi tuyn kp trong Lithium niobate. Mc d n khng b nh hng t cc h s chit quang trong s ti hp ca cc niobate. Do , vi nhng thuc tnh khc nhau, nhng lithium niobate vn c a vo bn trong ca SHG bng laser Nd:YAG, v vy m cc h s chic quang c iu chnh thch hp. Nhng gc hp pha c pht ra ti bc x 1084 micromet t laser HE-Ne ti 28.9oC trn trc c: v t bc x 1.1523 ti 27.2oC. Di nh hng ca cc in tr, LiIO3 pht ra tng s bc x kp khi s dng lm bom trong laser ND:YAG, v c s dng trong cc my o dao ng.


The end nguy n qu c th nh 0413240 o c ng l p 0413223 ng th nh tr 0413228

THE END

Nguyn Quc Thnh :0413240

o Cng Lp :0413223

ng Thnh Tr :0413228


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