Abstract:
This invention relates to a dispersion-compensating fiber which can be drawn at a lower temperature and can further reduce optical transmission loss. This dispersion-compensating fiber comprises a core portion containing a high concentration of GeO 2 and a cladding portion formed around the outer periphery of the core portion. The cladding portion comprises a first cladding containing fluorine or the like as an index reducer, a second cladding having a higher refractive index than that of the first cladding, and a third cladding which becomes a glass region substantially noncontributory to propagation of signal light. In particular, the third cladding contains a desired impurity such that the glass viscosity thereof becomes lower than that of the second cladding or pure silica cladding at a predetermined temperature.
Abstract:
A silica glass has a structure determination temperature of 1200 K or lower and an OH group concentration of at least 1,000 ppm. The silica glass is used for photolithography together with light in a wavelength region of 400 nm or shorter.
Abstract:
A synthetic quartz glass optical member for an ultraviolet laser, suitably applicable as a stepper lens of a lithographer using an excimer laser beam and other optical members, wherein the quartz glass has a hydroxyl content of 10 to 100 ppm, a chlorine content of 200 ppm or less, a hydrogen content of 1 x 10 molecules/cm or less, a homogeneity of refractive index of 5 x 10 or less in terms of DELTA n, and a birefringence of 5 nm/cm or less. The optical member can be produced by subjecting a volatile silicon compound to flame hydrolysis with oxyhydrogen flame, depositing the formed particulate silica on a heat-resistant support to prepare a porous silica matrix, heating the matrix in a vacuum as high as 1 x 10 Torr or above to a temperature of 1,400 DEG C or above to effect dehydration and degassing, homogenizing the resultant transparent quartz glass into highly homogeneous quartz glass free from striae in at least one direction, molding the highly homogeneous quartz glass, and annealing the molded glass.
Abstract:
The present invention is intended to enhance the heat resistance and purity of a quartz glass for forming a substrate for supporting active elements. A synthetic quartz glass substrate (1) supporting active elements is formed of high-purity synthetic quartz glass having a low impurity content, high heat resistance, a hydroxyl group content of 200 ppm or below and chlorine group content of 50 ppm or below. The substrate (1) is warped scarcely by heat. TFTs (6), i.e., active elements, and picture element electrodes (7) are formed on the surface of the synthetic quartz glass substrate (1) to construct a driving panel for a liquid crystal display of an active matrix type. A liquid crystal panel is formed by disposing the driving panel and a counter substrate (2) opposite to each other and sandwiching a liquid crystal layer (3) between the driving panel and the counter substrate (2).
Abstract:
본 발명은 극초자외광 리소그래피(Extreme Ultra-Violet Lithography; EUVL)용 반사형 마스크, 미러 등에 사용되고, 그의 광학면의 평탄도 및 표면 거칠기가 매우 우수하며, 면취부가 칩핑되는 것이 억제되는 EUVL용 광학 부재를 제공하는 것이다. 본 발명은 EUVL용 광학 부재의 광학면에 불소 및 염소 중 1종 이상을 함유하는 소스 가스(source gas)를 사용하여 가스 클러스터 이온 빔(Gas Cluster Ion Beam) 에칭을 실시하는 것을 포함하는 EUVL용 광학 부재의 표면 처리 방법에 관한 것이며, 여기서 상기 광학 부재는 OH 농도가 100 ppm 이상이고 TiO 2 를 함유하고 SiO 2 를 주성분으로 함유하는 실리카 유리 재료로 제조된다.
Abstract:
본 발명은 파장 365 nm의 자외선에 대한 내부 투과율 분포가 10 % 이하인 것을 특징으로 하는 나노임프린트 몰드용 티타니아 도핑 석영 유리를 제공한다. 본 발명에 따르면, 미세 패턴 전사시 몰드의 투과율 분포에 의한 수지의 경화 정도에 차이가 발생하기 어려운 나노임프린트 몰드에 바람직한 티타니아 도핑 석영 유리를 제공할 수 있다. 나노임프린트 몰드, 석영 유리, 티타니아, 내부 투과율, 미세 패턴 전사
Abstract:
표면에 미세한 요철 패턴을 갖는 기재에 있어서, 석영 유리 기재의 수직방향으로 요철 패턴의 치수는 고정확도를 가지고 전체 기재 표면에 걸쳐서 균일하도록 조절된다. 석영 유리 기재는 최대 40 ℃ 의 가상 온도 분포와 400 ppm 미만의 할로겐 농도를 갖거나 최대 40 ℃ 의 가상 온도 분포와 적어도 400 ppm 의 할로겐 농도와 최대 400 ppm 의 할로겐 농도 분포를 갖도록 제조되었으며, 석영 유리 기재의 표면의 에칭 속도를 균일하게 하고, 석영 유리 기재의 수직 방향으로 요철 패턴의 치수는 양호한 정확도로 전체 기재 표면에 걸쳐 균일하도록 제어된다. 요철 패턴, 석영 유리 기재.
Abstract:
Disclosed is an optical fiber having a silica-based core comprising an alkali metal oxide selected from the group consisting of K2O, Na2O, LiO2, Rb2O, Cs2O and mixtures thereof in an average concentration in said core between about 50 and 500 ppm by weight, said core further comprising chlorine and fluorine, wherein the average concentration of fluorine in said core is greater than the average concentration of alkali metal oxide in said core and the average concentration of chlorine in said core is greater than the average concentration of alkali metal oxide in said core; and a silica-based cladding surrounding and directly adjacent the core. By appropriately selecting the concentration of alkali metal oxide dopant in the core and the cladding, a low loss optical fiber may be obtained.
Abstract:
What is disclosed includes OD-doped synthetic silica glass capable of being used in optical elements for use in lithography below about 300 nm. OD-doped synthetic silica glass was found to have significantly lower polarization-induced birefringence value than non-OD-doped silica glass with comparable concentration of OH. Also disclosed are processes for making OD-dopes synthetic silica glasses, optical member comprising such glasses, and lithographic systems comprising such optical member. The glass is particularly suitable for immersion lithographic systems due to the exceptionally low polarization-induced birefringence values at about 193 nm.