{"id":6096,"date":"2016-12-05T19:33:01","date_gmt":"2016-12-05T12:33:01","guid":{"rendered":"http:\/\/ttud.com.vn\/?p=6096"},"modified":"2017-10-03T14:41:39","modified_gmt":"2017-10-03T07:41:39","slug":"tia-laser-dau-tien-tao-ra-tu-nuoc-va-anh-sang","status":"publish","type":"post","link":"https:\/\/casta.ttud.com.vn\/index.php\/tia-laser-dau-tien-tao-ra-tu-nuoc-va-anh-sang\/","title":{"rendered":"Tia laser \u0111\u1ea7u ti\u00ean t\u1ea1o ra t\u1eeb n\u01b0\u1edbc v\u00e0 \u00e1nh s\u00e1ng"},"content":{"rendered":"

C\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 ph\u00e1t tri\u1ec3n th\u00e0nh c\u00f4ng m\u1ed9t lo\u1ea1i laser \u0111\u1eb7c bi\u1ec7t, l\u1ea7n \u0111\u1ea7u ti\u00ean xu\u1ea5t hi\u1ec7n tr\u00ean th\u1ebf gi\u1edbi – \u201cLaser N\u01b0\u1edbc\u201d. Lo\u1ea1i tia laser \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1edfi s\u1ef1 giao thoa gi\u1eefa \u00e1nh s\u00e1ng v\u00e0 s\u00f3ng n\u01b0\u1edbc.<\/strong><\/p>\n

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M\u00f4 ph\u1ecfng Laser n\u01b0\u1edbc<\/em><\/p>\n

C\u00f4ng ngh\u1ec7 laser m\u1edbi n\u00e0y cho ph\u00e9p c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u c\u00f3 th\u1ec3 ki\u1ec3m so\u00e1t v\u00e0 v\u1eadn h\u00e0nh r\u1ea5t d\u1ec5 d\u00e0ng th\u1eadm ch\u00ed trong c\u00e1c c\u00f4ng ngh\u1ec7 si\u00eau nh\u1ecf nh\u01b0 \u201cLab on a chip\u201d. C\u00f4ng ngh\u1ec7 n\u00e0y cho ph\u00e9p nghi\u00ean c\u1ee9u v\u00e0 th\u1ef1c nghi\u1ec7m tr\u00ean c\u00e1c t\u1ebf b\u00e0o si\u00eau nh\u1ecf \u0111\u1ed3ng th\u1eddi ki\u1ec3m tra t\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a c\u00e1c lo\u1ea1i thu\u1ed1c c\u1ea7n th\u1eed nghi\u1ec7m \u0111\u1ec3 cho ra \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 mang t\u00ednh th\u1ef1c ti\u1ec5n cao.<\/p>\n

V\u1eady laser n\u01b0\u1edbc l\u00e0 g\u00ec?<\/strong><\/p>\n

V\u1eady nh\u01b0 th\u1ebf n\u00e0o m\u00e0 nh\u00f3m nghi\u00ean c\u1ee9u c\u00f3 th\u1ec3 t\u1ea1o ra laser t\u1eeb s\u00f3ng n\u01b0\u1edbc? \u0110\u1ea7u ti\u00ean nh\u00f3m ph\u1ea3i x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c nh\u1eefng kh\u00f3 kh\u0103n s\u1ebd g\u1eb7p ph\u1ea3i.<\/p>\n

Theo nh\u00f3m nghi\u00ean c\u1ee9u \u0111\u1ebfn t\u1eeb Vi\u1ec7n khoa h\u1ecdc c\u00f4ng ngh\u1ec7 Technion \u2013 Israel \u1edf Haifa th\u00ec r\u00e0o c\u1ea3n l\u1edbn nh\u1ea5t \u0111\u00f3 ch\u00ednh l\u00e0 t\u1ea7n s\u1ed1 dao \u0111\u1ed9ng c\u1ee7a s\u00f3ng n\u01b0\u1edbc tr\u00ean b\u1ec1 m\u1eb7t th\u1ea5p h\u01a1n r\u1ea5t nhi\u1ec1u so v\u1edbi s\u00f3ng \u00e1nh s\u00e1ng cho n\u00ean vi\u1ec7c t\u1ea1o ra tia laser l\u00e0 kh\u00f4ng kh\u1ea3 thi.<\/p>\n

\u0110\u1ec3 kh\u1eafc ph\u1ee5c nh\u01b0\u1ee3c \u0111i\u1ec3m n\u00e0y c\u1ee7a s\u00f3ng n\u01b0\u1edbc th\u00ec nh\u00f3m \u0111\u00e3 t\u1ea1o ra m\u1ed9t thi\u1ebft b\u1ecb c\u00f3 s\u1eed d\u1ee5ng m\u1ed9t s\u1ee3i quang h\u1ecdc \u0111\u1ec3 cung c\u1ea5p \u00e1nh s\u00e1ng cho m\u1ed9t gi\u1ecdt nh\u1ecf Octane v\u00e0 N\u01b0\u1edbc. S\u1ef1 giao \u0111\u1ed9ng c\u1ee7a gi\u1ecdt n\u01b0\u1edbc s\u1ebd di\u1ec5n ra t\u1eeb t\u1eeb cho \u0111\u1ebfn khi \u0111\u1ea1t \u0111\u01b0\u1ee3c ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng v\u1eeba \u0111\u1ee7, ngu\u1ed3n s\u00e1ng n\u00e0y s\u1ebd t\u01b0\u01a1ng t\u00e1c v\u1edbi s\u00f3ng b\u1ec1 m\u1eb7t \u0111\u01b0\u1ee3c t\u1ea1o b\u1edfi giao \u0111\u1ed9ng c\u1ee7a gi\u1ecdt n\u01b0\u1edbc.<\/p>\n

\u201cS\u1ef1 t\u01b0\u01a1ng t\u00e1c gi\u1eefa \u00e1nh s\u00e1ng t\u1eeb s\u1ee3i quang v\u00e0 nh\u1eefng rung \u0111\u1ed9ng r\u1ea5t nh\u1ecf c\u1ee7a gi\u1ecdt n\u01b0\u1edbc gi\u1ed1ng nh\u01b0 m\u1ed9t ti\u1ebfng vang, n\u01a1i m\u00e0 s\u1ef1 t\u01b0\u01a1ng t\u00e1c c\u1ee7a s\u00f3ng v\u00e0 b\u1ec1 m\u1eb7t s\u00f3ng \u0111i qua c\u00f3 th\u1ec3 gi\u00fap ch\u00fang l\u1eb7p \u0111i l\u1eb7p l\u1ea1i nhi\u1ec1u l\u1ea7n\u201d \u2013 nh\u00f3m nghi\u00ean c\u1ee9u cho bi\u1ebft. \u0110\u1ec3 t\u0103ng c\u01b0\u1eddng hi\u1ec7u qu\u1ea3 c\u1ee7a vi\u1ec7c t\u01b0\u01a1ng t\u00e1c gi\u1eefa \u00e1nh s\u00e1ng v\u1edbi s\u00f3ng t\u1ea1o b\u1edf gi\u1ecdt n\u01b0\u1edbc, nh\u00f3m \u0111\u00e3 nghi\u00ean c\u1ee9u l\u1ef1a ch\u1ecdn v\u00e0 s\u1eed d\u1ee5ng v\u1eadt li\u1ec7u c\u00f3 \u0111\u1ed9 trong su\u1ed1t c\u00f9ng \u0111\u1ed9 nh\u1edbt cao.<\/p>\n

Ph\u1ea7n th\u00fa v\u1ecb nh\u1ea5t c\u1ee7a nghi\u00ean c\u1ee9u n\u00e0y ch\u00ednh l\u00e0 vi\u1ec7c t\u0103ng c\u01b0\u1eddng s\u1ee3i quang h\u1ecdc \u0111\u1ec3 t\u1ea1o h\u00ecnh cho gi\u1ecdt n\u01b0\u1edbc.<\/p>\n

V\u1edbi k\u1ef9 thu\u1eadt m\u1edbi n\u00e0y tia laser c\u00f3 kh\u1ea3 n\u0103ng ki\u1ec3m so\u00e1t v\u00e0 hi\u1ec7u n\u0103ng s\u1eed d\u1ee5ng l\u1edbn g\u1ea5p 1000 l\u1ea7n so v\u1edbi c\u00f4ng ngh\u1ec7 t\u1ea1o laser hi\u1ec7n t\u1ea1i v\u00e0 s\u1ebd r\u1ea5t h\u1eefu \u00edch cho nghi\u00ean c\u1ee9u t\u1ebf b\u00e0o trong ph\u00f2ng th\u00ed nghi\u1ec7m n\u1ebfu c\u00f4ng ngh\u1ec7 m\u1edbi n\u00e0y \u0111\u01b0\u1ee3c ho\u00e0n thi\u1ec7n trong t\u01b0\u01a1ng lai.<\/p>\n

Nh\u00f3m \u0111\u00e3 \u0111\u0103ng t\u1ea3i nghi\u00ean c\u1ee9u tr\u00ean t\u1ea1p ch\u00ed Nature Photonics.<\/p>\n

Nguy\u00ean l\u00fd ph\u00e1t sinh laser<\/strong><\/p>\n

Theo nh\u1eefng kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n c\u1ee7a v\u1eadt l\u00fd l\u01b0\u1ee3ng t\u1eed, khi ta chi\u1ebfu m\u1ed9t ch\u00f9m \u00e1nh s\u00e1ng v\u00e0o m\u1ed9t m\u00f4i tr\u01b0\u1eddng v\u1eadt ch\u1ea5t (thu\u1eadt ng\u1eef v\u1eadt l\u00fd h\u1ecdc g\u1ecdi l\u00e0 h\u1ec7 v\u1eadt l\u00fd t\u01b0\u1ee3ng t\u1eed) th\u00ec ch\u00f9m \u00e1nh s\u00e1ng s\u1ebd y\u1ebfu d\u1ea7n \u0111i do b\u1ecb h\u1ea5p thu b\u1edfi m\u00f4i tr\u01b0\u1eddng v\u1eadt ch\u1ea5t. B\u1ea3n ch\u1ea5t qu\u00e1 tr\u00ecnh b\u1ecb h\u1ea5p thu \u1ea5y l\u00e0 c\u00e1c h\u1ea1t \u00e1nh s\u00e1ng (photon) \u0111\u00e3 truy\u1ec1n n\u0103ng l\u01b0\u1ee3ng k\u00edch ho\u1ea1t c\u00e1c ph\u00e2n t\u1eed v\u1eadt ch\u1ea5t \u201cnh\u1ea3y\u201d t\u1eeb tr\u1ea1ng th\u00e1i \u1ed5n \u0111\u1ecbnh A l\u00ean m\u1ed9t tr\u1ea1ng th\u00e1i B v\u1edbi m\u1ee9c n\u0103ng l\u01b0\u1ee3ng cao h\u01a1n. V\u00ec B l\u00e0 m\u1ed9t tr\u1ea1ng th\u00e1i kh\u00f4ng \u1ed5n \u0111\u1ecbnh, n\u00ean sau m\u1ed9t th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh, c\u00e1c ph\u00e2n t\u1eed \u0111ang \u1edf m\u1ee9c B l\u1ea1i \u201cnh\u1ea3y\u201d v\u1ec1 m\u1ee9c A v\u00e0 trong l\u00fac \u201cnh\u1ea3y v\u1ec1\u201d \u0111\u00f3 n\u00f3 c\u0169ng ph\u00e1t ra m\u1ed9t photon mang n\u0103ng l\u01b0\u1ee3ng b\u1eb1ng n\u0103ng l\u01b0\u1ee3ng n\u00f3 \u0111\u00e3 h\u1ea5p thu, theo ki\u1ec3u \u201cvay g\u00ec tr\u1ea3 n\u1ea5y\u201d. \u0110\u00f3 l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng b\u1ee9c x\u1ea1. Tuy nhi\u00ean c\u00e1c h\u1ea1t photon b\u1ee9c x\u1ea1 n\u00e0y kh\u00f4ng nhi\u1ec1u, v\u00ec n\u00f3 t\u1ec9 l\u1ec7 v\u1edbi s\u1ed1 ph\u00e2n t\u1eed c\u00f3 \u1edf m\u1ee9c B, m\u00e0 s\u1ed1 ph\u00e2n t\u1eed \u1edf trang th\u00e1i B bao gi\u1edd c\u0169ng \u00edt h\u01a1n s\u1ed1 ph\u00e2n t\u1eed \u1edf tr\u1ea1ng th\u00e1i \u1ed5n \u0111\u1ecbnh A. C\u00e1c photon b\u1ee9c x\u1ea1 n\u00e0y ph\u00e1t ra theo m\u1ecdi h\u01b0\u1edbng m\u1ed9t c\u00e1ch t\u1ef1 do n\u00ean c\u00f2n g\u1ecdi n\u00f3 l\u00e0 b\u1ee9c x\u1ea1 t\u1ef1 do.<\/p>\n

Khi ta l\u00e0m cho c\u00e1c photon t\u01b0\u01a1ng t\u00e1c b\u1edfi c\u00e1c ph\u00e2n t\u1eed \u1edf m\u1ee9c cao B, b\u1eaft n\u00f3 tr\u1edf v\u1ec1 A s\u1edbm h\u01a1n v\u00e0 ph\u00e1t sinh ra photon, c\u00e1c photon c\u00f3 \u0111\u1ed3ng m\u1ee9c n\u0103ng l\u01b0\u1ee3ng v\u00e0 \u0111\u00fang b\u1eb1ng m\u1ee9c n\u0103ng l\u01b0\u1ee3ng c\u00e1c photon c\u1ee7a ngu\u1ed3n chi\u1ebfu \u0111\u00e3 truy\u1ec1n cho n\u00f3 th\u00ec \u0111\u00f3 l\u00e0 b\u1ee9c x\u1ea1 k\u00edch ho\u1ea1t.<\/p>\n

Khi t\u1ea1o ra b\u1ee9c x\u1ea1 k\u00edch ho\u1ea1t \u1edf m\u1ee9c \u0111\u1ed9 cao cho c\u00e1c photon b\u1ee9c x\u1ea1 ph\u00e1t ra li\u00ean t\u1ee5c \u1edf m\u1ee9c cao nh\u1ea5t, r\u1ed3i \u0111\u01b0\u1ee3c ch\u1ecdn l\u1ecdc v\u00e0 khuy\u1ebfch \u0111\u1ea1i \u0111\u1ec3 ch\u00fang ph\u00e1t v\u1ec1 c\u00f9ng m\u1ed9t h\u01b0\u1edbng v\u1edbi nh\u1eefng t\u00ednh ch\u1ea5t gi\u1ed1ng nhau ta s\u1ebd thu \u0111\u01b0\u1ee3c ch\u00f9m s\u00e1ng laser. Nh\u01b0 v\u1eady nguy\u00ean l\u00fd c\u1ee7a m\u00e1y ph\u00e1t laser ch\u00ednh l\u00e0 l\u00e0m sao cho ngu\u1ed3n s\u00e1ng chi\u1ebfu v\u00e0o m\u00f4i tr\u01b0\u1eddng ho\u1ea1t ch\u1ea5t laser kh\u00f4ng b\u1ecb y\u1ebfu \u0111i \u0111\u1ec3 c\u00f3 th\u1ec3 k\u00edch ho\u1ea1t li\u00ean t\u1ee5c c\u00e1c ph\u1ea7n t\u1eed v\u1eadt ch\u1ea5t cho s\u1ed1 ph\u00e2n t\u1eed \u1edf m\u1ee9c B lu\u00f4n nhi\u1ec1u h\u01a1n \u1edf m\u1ee9c A, nh\u01b0 v\u1eady s\u1ed1 photon b\u1ee9c x\u1ea1 s\u1ebd \u0111\u01b0\u1ee3c ph\u00e1t sinh nhi\u1ec1u \u0111\u1ebfn m\u1ee9c t\u1ed1i \u0111a. Khi \u0111\u00f3, b\u1eb1ng c\u00e1c thi\u1ebft b\u1ecb \u0111\u1eb7c bi\u1ec7t, ngu\u1ed3n s\u00e1ng b\u1ee9c x\u1ea1 n\u00e0y s\u1ebd \u0111\u01b0\u1ee3c ch\u1ecdn l\u1ecdc v\u00e0 khuy\u1ebfnh \u0111\u1ea1i \u0111\u1ec3 ph\u00e1t ra m\u1ed9t ch\u00f9m \u00e1nh s\u00e1ng \u0111\u01a1n s\u1eafc, g\u1ed3m nh\u1eefng tia s\u00e1ng c\u00f3 c\u00f9ng h\u01b0\u1edbng, c\u00f3 b\u01b0\u1edbc s\u00f3ng g\u1ea7n t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u00e0 c\u00f3 \u0111\u1ed9 t\u1eadp trung cao. \u0110\u00f3 ch\u00ednh l\u00e0 laser.<\/p>\n

C\u1ea5u t\u1ea1o m\u00e1y ph\u00e1t laser, bao g\u1ed3m c\u00e1c b\u1ed9 ph\u1eadn ch\u00ednh:<\/p>\n

– Ho\u1ea1t ch\u1ea5t laser: L\u00e0 m\u00f4i tr\u01b0\u1eddng ch\u1ee9a c\u00e1c ho\u1ea1t ch\u1ea5t c\u00f3 kh\u1ea3 n\u0103ng ph\u00e1t ra b\u1ee9c x\u1ea1 laser khi \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t b\u1eb1ng m\u1ed9t ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng.<\/p>\n

– Ngu\u1ed3n nu\u00f4i: L\u00e0 ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng \u0111\u1ec3 duy tr\u00ec ho\u1ea1t \u0111\u1ed9ng c\u1ee7a m\u00f4i tr\u01b0\u1eddng ho\u1ea1t ch\u1ea5t laser, gi\u1eef cho ho\u1ea1t ch\u1ea5t lu\u00f4n lu\u00f4n \u1edf tr\u1ea1ng th\u00e1i c\u00f3 s\u1ed1 ph\u1ea7n t\u1eed \u1edf\u00f8 m\u1ee9c B nhi\u1ec1u h\u01a1n \u1edf m\u1ee9c A.<\/p>\n

– Bu\u1ed3ng c\u1ed9ng h\u01b0\u1edfng: Bao g\u1ed3m 1 g\u01b0\u01a1ng ph\u1ea3n x\u1ea1 to\u00e0n ph\u1ea7n v\u00e0 1 g\u01b0\u01a1ng b\u00e1n m\u1edd<\/p>\n

(\u0111\u1ed9 ph\u1ea3n x\u1ea1 t\u1eeb 70% \u0111\u1ebfn 99%)<\/p>\n

Bu\u1ed3ng c\u1ed9ng h\u01b0\u1edfng cho ph\u00e9p ngu\u1ed3n s\u00e1ng k\u00edch th\u00edch ch\u1ea5t nhi\u1ec1u l\u1ea7n v\u00e0 ch\u00f9m tia s\u00e1ng b\u1ee9c x\u1ea1 s\u1ebd \u0111\u01b0\u1ee3c khuy\u1ebfch \u0111\u1ea1i v\u00e0 ch\u1ecdn l\u1ecdc qua g\u01b0\u01a1ng ph\u1ea3n x\u1ea1 to\u00e0n ph\u1ea7n v\u00e0 g\u01b0\u01a1ng m\u1edd cho \u0111\u1ebfn khi \u1ed5n \u0111\u1ecbnh \u0111\u1ec3 ph\u00e1t ra ch\u00f9m s\u00e1ng laser.<\/p>\n

Ph\u00e2n lo\u1ea1i laser:<\/strong><\/p>\n

T\u00f9y theo lo\u1ea1i ho\u1ea1t ch\u1ea5t laser ta s\u1ebd thu \u0111\u01b0\u1ee3c c\u00e1c tia laser v\u1edbi t\u00ean g\u1ecdi kh\u00e1c nhau:<\/p>\n

– Laser r\u1eafn c\u00f3 m\u00f4i tr\u01b0\u1eddng ho\u1ea1t ch\u1ea5t \u1edf th\u1ec3 r\u1eafn. C\u00f3 h\u00e0ng tr\u0103m lo\u1ea1i nh\u01b0 Laser Ruby, Laser YAG, Laser b\u00e1n d\u1eabn, Laser th\u1ee7y tinh, vv\u2026\u2026.<\/p>\n

– Laser l\u1ecfng c\u00f3 m\u00f4i tr\u01b0\u1eddng ho\u1ea1t ch\u1ea5t \u1edf th\u1ec3 l\u1ecfng. C\u00f3 50 lo\u1ea1i kh\u00e1c nhau. C\u00e1c ho\u1ea1t ch\u1ea5t th\u1ec3 l\u1ecfng c\u00f3 m\u00e0u s\u1ebd cho ta laser m\u00e0u, l\u00e0 nh\u1eefng laser r\u1ea5t th\u00f4ng d\u1ee5ng hi\u1ec7n nay.<\/p>\n

– Laser kh\u00ed c\u00f3 m\u00f4i tr\u01b0\u1eddng ho\u1ea1t ch\u1ea5t \u1edf th\u1ec3 kh\u00ed . C\u0169ng c\u00f3 h\u01a1n tr\u0103m lo\u1ea1i kh\u00ed \u0111\u01b0\u1ee3c d\u00f9ng l\u00e0m ho\u1ea1t ch\u1ea5t laser nh\u01b0 laser CO2 , laser heli-Neon, laser Argon, vv \u2026.<\/p>\n

Ng\u01b0\u1eddi ta c\u00f2n ph\u00e2n lo\u1ea1i theo t\u00ednh ch\u1ea5t nh\u01b0: laser n\u00f3ng nh\u01b0 laser CO2, Argon) v\u00e0 laser l\u1ea1nh (nh\u01b0 Laser He-Ne, Laser h\u1ed3ng ngo\u1ea1i).<\/p>\n

Qu\u1ed1c V\u0103n<\/em>
\n www.khampha.vn<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

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