Ti a laser m a n g n a n g lirgng, lam n o n g m o khi c h ie u vao. T a c d u n g g a y n o n g phu t h u oc va o mure do n a ng lu o ng c h ie u vao mot d on vi m o , cu the phu t hu oc vao hai yet to sau: c u o n g do n a n g lu on g c u a tia l aser va d o s au c a n thiet de ha p thu toan bo tia laser. Vi du voi c u o n g d o tia la 10 watt t ac d o n g len dien tich b l ma t 0,001 cm" ( n h u vat c o n g suat la 100 00 w a t t / c m " ) , h a p thu laser C 0 2 c an do sau 0 , 0 1 c m , laser A r g o n 0 , 4 c m . l aser Y A G 3 c m . D u o n g n hi e n, tac d u n g sinh hoc lai phu t h u o c vao n a n g l u o n g s inh ra a m o. C h u n g ta q u a n tam d en 3 loai tac d o n g sinh hqc:
- T a c d o n g lam bay hoi h o a c cdt: sue n o n g lam b a y hoi n u o c t r o n g te bao, te b a o bi soi len, v o tu n g ra giai p h o n g hoi n u o c va c a c m a n h vu n te bao. T a c d o n g lam ba y hoi n u o c dien ra t rong m o t p h a m vi m o vo c u n g hep, c o the sur d u n g c o c h e na y de pha h uy m o ( m o lac noi m a c tu c u n g ) , de cdt m o ( da y c h d n g di nh , t ha nh voi trurng).
- Ta c d u n g c a m m a u khi n hiet do tai c h 6 6 m o tren 5 5°C, n h u n g d uoi 100°C. Stic n o n g lam bien c h a t p rote in, ddn den tac c dc m a c h m a u ( m a c h co d u o n g kinh den 0 , 5 m m ) doi voi laser C 0 2.
- Tdc d u n g kich thich khi nhiet do tai m o ndm giura k h o a n g 4 0 ° C v a 55°C. Cdc te bao k h o n g bi p ha h u y va c o the thu d u o c k h a n a n g tdi t a o m o rat Ion. D i eu do ly giai hien t u g n g lanh vet seo rat n h a n h khi d i l u tri b dng laser.
Tr en thuc te, cdc tdc d u n g c u a laser dan xen, h o a n lan va o n h a u . M o v u a bi ba y hoi (cdt), c a m m a u va d u g c kich thich nhiet. T u y n h i e n , t r o n g t ung tr uo ng h g p cu the c o the c o uu the c u a t un g tdc d u n g . D i e u d o phu t h u o c vao do dai b u o c s o n g, c u o n g do tia va thoi gian tdc d u n g . L a s e r C 0 2 lam ba y hoi n hi eu h on, m u o n c o tdc d u n g c a m m a u thi phai sir d u n g voi c o n g suat th ap ( duoi 10 wa t t/ c m" ) , C u n g m ot c o n g suat (vi du 10 w a t t / c m 2), v u n g tdc d u n g len m o c o d u d n g k inh 0,1 m m ( d u n g d i e m hoi tu) c o n g s u at s i nh ra k h o a n g 1 2 0 0 0 w a t t / c m 2; neu v u n g tdc d u n g len m o c o d u d n g k i n h 0 , 5 m m (xa d ie m hoi tu) c o n g suat sinh ra k h o a n g 5 0 0 w a t t / c m 2, khi d u d n g k i n h 2 m m c o n g suat c o n k h o a n g 3 0 0 w a t t / c m 2. N h u vay, voi c u n g m o t c o n g suat, tdc d u n g c o the la cat m o h o a c lam b ay hoi m o h o a c c o tdc d u n g c a m m a u . Li en q u a n den thdi gia n, tdc d u n g cdt m o sinh ra khi thdi g i a n tdc d u n g k eo dai, trai lai c a m m a u tot h o n khi thdi gian tac d u n g n gdn ( q u e t tia laser). D i e m cuoi c u n g , tdc d u n g sinh hoc c o n phu t h u o c vao t h a n h p h a n c a u true c u a mo. L a s e r C 0 2 c a n g c o hieu q u a khi m o chura n h i e u n u d e vi n u d e h a p thu laser C 0 2 rat m a n h .
IV- CHI DjNH
- Pha huy c dc ton t h u o n g lac noi m a c tir c u n g : L a s e r lam p ha h u y c d c m o co n hi eu h e m o g l o b i n m a k h o n g lam tdn t h u o n g c dc t a n g d c a n h d o n h u bdng q u a n g , nieu q u a n . D u y nha t l aser C 0 2 c o the k i e m s odt d u g c do
s5u tac d u n g nen c o the xir d u n g d uo c .
- G o dfnh voi trurng, b u o n g trurng la chi dinh tuyet doi c u a l aser C 0 2. T a c d u n g rat tot neu c ac da y c h d n g dfnh, m o n g . L a s e r k h o n g c o k h a n a n g phdu tich n h u keo, c h o nen co the’ lam ton t h u o n g c a c ta ng bi dfnh a
t ro ng do (ruot ...). Vi vay, k h o n g ne n s u d u n g laser t ro n g c a c t r u d n g h o p dfnh day, phurc tap.
- Ph a u t huat voi trirng g o m c o cdt voi trurng, m d voi trurng, t ao loa vdi trurng md i ... D u n g l aser c o c o n g suat t h a p dot m a t t h a n h m a c ciia c a c tua loa mdi tao lam c h o c a c tua loa na y Ion ra rat g i o n g vdi tu n hi e n .