Abstract: A process deciding method in a method of manufacturing an optical element by heating and press-molding an optical material to mold the optical element using a molding die on which a release film is formed, includes a basicity degree identifying process in which a degree of basicity of the optical material is identified; and a removing process determining process of determining whether to perform one or both of first removing process in which an oxidizing substance is removed and a second removing process in which a basic substance is removed from at least one of a surface of the optical material and a surface of the release film by comparing the degree of basicity of the optical material identified in the basicity degree identifying process with a predetermined reference value, before press-molding the optical material.

Abstract: An optical glass in which a Cr content is less than 5 ppm, or a Sm content is 3 ppm or less, with respect to a 100% basic glass composition containing 2-10% SiO2, 5-45% B2O3, 0-15% RO (R?Zn, Sr, Ca, Ba), 30-60% La2O3, 0-40% Ln2O3 (Ln=Y, Gd), and, 0-30% ZrO2+Nb2O5+Ta2O5 by weight, and an optical apparatus which is provided with an optical system having the optical glass.

Abstract: An optical glass contains a substance A generating light of a wavelength ?2 when irradiated with light of a wavelength ?1 and a substance B generating light of a wavelength ?3 when irradiated with light of the wavelength ?1 when a relation between the wavelength ?1 and the wavelength ?2 and the wavelength ?3 is assumed to be ?1<?2<?3 with respect to 100% of basic glass composition containing 2-10% of SiO2, 5-45% of B2O3, and 30-60% of La2O3 or further containing 0-15% of RO(R=Zn, Sr, Ba), 0-40% of Ln2O3(Ln=Y, Gd), and 0-30% of ZrO2+Nb2O5+Ta2O5, and the substance B generates fluorescent light with the wavelength ?3 of 650 nm or more when excited at the wavelength ?1 of 550 nm or less.

Abstract: An optical glass includes a substance A generating light of a wavelength ?2 when irradiated with light of a wavelength ?1 and a substance B generating light of a wavelength ?3 when irradiated with light of the wavelength ?1 in the case where the relation between the wavelength ?1, the wavelength ?2, and the wavelength ?3 is assumed to be ?1<?2<?3 with respect to a 100% of basic glass composition containing at least, 2-20% SiO2, 5-45% B2O3, and 10-29% La2O3, by weight, or with respect to a 100% of basic glass composition containing; at least, 2-20% SiO2, 5-45% B2O3, 10-29% La2O3, 0-45% RO (R=Zn, Sr, Ba), 0-10% Ln2O3 (Ln=Y, Gd), and 1-20% total of ZrO2+Nb2O5+TiO2+Ta2O5, by weight.

Abstract: An optical glass includes a substance A generating light of a wavelength ?2 when irradiated with light of a wavelength ?1 and a substance B generating light of a wavelength ?3 when irradiated with light of the wavelength ?1 in the case where the optical glass includes 5-50 ppm Fe with respect to a 100% basic glass composition containing at least, 2-10% SiO2, 5-45% B2O3, and 30-60% La2O3, by weight, or the relation of the wavelength ?1, the wavelength ?2, and the wavelength ?3 is assumed to be ?1<?2<?3 with respect to a 100% basic glass composition containing; at least, 2-10% SiO2, 5-45% B2O3, 30-60% La2O3, 0-15% RO (R=Zn, Sr, Ba), 0-40% Ln2O3 (Ln=Y, Gd), and 0-30% total of ZrO2+Nb2O5+Ta2O5, by weight.

Abstract: An optical glass includes a substance A generating light of a wavelength ?2 when irradiated with light of a wavelength ?1 and a substance B generating light of a wavelength ?3 when irradiated with light of the wavelength ?1 in the case where the relation between the wavelength ?1, the wavelength ?2, and the wavelength ?3 is assumed to be ?1<?2<?3 with respect to a 100% of basic glass composition containing at least, 2-20% SiO2, 5-45% B2O3, and 10-29% La2O3, by weight, or with respect to a 100% of basic glass composition containing; at least, 2-20% SiO2, 5-45% B2O3, 10-29% La2O3, 0-45% RO (R=Zn, Sr, Ba), 0-10% Ln2O3 (Ln=Y, Gd), and 1-20% total of ZrO2+Nb2O5+TiO2+Ta2O5, by weight.

Abstract: An optical glass contains a substance A generating light of a wavelength ?2 when irradiated with light of a wavelength ?1 and a substance B generating light of a wavelength ?3 when irradiated with light of the wavelength ?1 when a relation between the wavelength ?1 and the wavelength ?2 and the wavelength ?3 is assumed to be ?1<?2<?3 with respect to 100% of basic glass composition containing 2-10% of SiO2, 5-45% of B2O3, and 30-60% of La2O3 or further containing 0-15% of RO(R?Zn, Sr, Ba), 0-40% of Ln2O3(Ln=Y, Gd), and 0-30% of ZrO2+Nb2O5+Ta2O5, and the substance B generates fluorescent light with the wavelength ?3 of 650 nm or more when excited at the wavelength ?1 of 550 nm or less.

Abstract: An optical glass in which a Cr content is less than 5 ppm, or a Sm content is 3 ppm or less, with respect to a 100% basic glass composition containing 2-10% SiO2, 5-45% B2O3, 0-15% RO (R?Zn, Sr, Ca, Ba), 30-60% La2O3, 0-40% Ln2O3 (Ln=Y, Gd), and, 0-30% ZrO2+Nb2O5+Ta2O5 by weight, and an optical apparatus which is provided with an optical system having the optical glass.

Abstract: An optical glass includes a substance A generating light of a wavelength ?2 when irradiated with light of a wavelength ?1 and a substance B generating light of a wavelength ?3 when irradiated with light of the wavelength ?1 in the case where the optical glass includes 5-50 ppm Fe with respect to a 100% basic glass composition containing at least, 2-10% SiO2, 5-45% B2O3, and 30-60% La2O3, by weight, or the relation of the wavelength ?1, the wavelength ?2, and the wavelength ?3 is assumed to be ?1<?2<?3 with respect to a 100% basic glass composition containing; at least, 2-10% SiO2, 5-45% B2O3, 30-60% La2O3, 0-15% RO (R—Zn, Sr, Ba), 0-40% Ln2O3 (Ln=Y, Gd), and 0-30% total of ZrO2+Nb2O5+Ta2O5, by weight.