C) 13K, gin bd viing cam xuat hien hai vach hep vdi cudng do manh d 456nm va 461nm n i m trdn nen cua dam phat quang mau xanh lam tir
HOI NGH! VAT LY TOAN QUOC LAN THl> SAU
NANG CAP HE MAY QUANG PHO CACH TLT KEP GDM-1000 PHUC VU NGHIEN c u t ! QUANG PHO HOC LASER NGHIEN c u t ! QUANG PHO HOC LASER
(Tieu ban Quang hpc Quang pho)
Nguyen The Binh, Pham Van Bin ^Nguyln Anh Tuin, Du-ong Vu Tru-oTig, Nguyln Thi H^ng
Khoa Vat ly, Dai hoc KHTN, Dai hoc Qu6c gia Ha noi 334 dudng Nguyln trai, Thanh Xuan, Ha noi
Tren ca sa may quang ph6 each tii kep GDM-1000 (Carl-Zeiss Jena) chung toi da nghien curu thay the ky thuat tir ghi bang ky thuat ghep n6i may tinh, su dung khuech dai Lock-in (DSP-Lock-in Amplifier SR 830) va thay nhan quang dien mdi (R-928
Hamamatsu) de nang cao 66 nhay pho va md rong vung pho lam viec. Mot he thu ph6
Raman kich thich bang laser Argon va laser He-Ne da dugc xay dung thanh cong cho phep nghien cuu cau true pho phan tu ciia cac thanh phan dung dich huu ca, mot so thuoc tinh quang hoc cua cac mau vat lieu ban dan. Viec thu pho Raman kich thich bang laser He-Ne da han che cd hieu qua anh hirdng cua cac dam huynh quang trong pho Raman cua cac thanh phan dung dich huu co nhu la chiet pham dau md. Ben canh phd Raman laser, he may quang pho nay cdn cho phep chung tdi nghien cuu phd huynh quang laser ciia nhieu vat lieu kliac nhau, nghien cuu cau true phd laser cung nhu quang phd hoc quang hoc phi tuyen.
I - MO DAU
Xay dimg mot he do quang pho c6 do nhay tot, on dinh va nang suat phan giai cao la mong muon ctia nhieu phong thi nghiem quang phọ Nhu chung ta da biet, cac phuang quang pho hoc laser bao gom quang pho hgc Raman, huynh quang. hap thu
...da \'a dang dugc ung dung rong rai de nghien cuu cau true phan tu, hoa dau .moi truong nuac va khi, thuoc tinh vat lieu quang dien tu ke ca vat lieu cau true nano ... Gan da>'. cac hieu ung phi tu>'en phat tan so tong va phat hoa ba bac hai da trd thanh cong cu quang pho de khao sat be mat vdi dac trung be mat cao [1]. Quang pho hoa ba bac hai dugc biet den nhu mot txng cu vien noi bat nham hieu ro hon ve tinh chat quang ciia cac cSu tnic nano [2]. Ngudi ta rat can cac he quang pho thu dugc tin hieu y^u, x§p xi nhilu on. Nhung he may quang pho nhu vay noi chung rat dat tien. Chung toi da nghien cuu nang cap he may quang pho GDM-1000 cua hang Carl- Zeiss Jena CHDC Due cu thanh mot he thu quang pho su dung ky thuat khuech dai Lock-in. co ghep ndi xu ly s6 lieu tren may tinh.May quang pho each tu kep GDM-