| abstract |
The purpose of the present invention is to provide: a glass substrate in which it is possible to suppress changes in the quality of the glass substrate surface due to burning, etc., and to maintain optical characteristics; and an optical component in which the glass substrate is used. The present invention pertains to a glass substrate containing as a reaction factor component at least one selected from the group consisting of Li, Na, K, Mg, Ca, Sr, Ba, and Zn, the glass substrate having a surface depletion layer in which the total molar concentration (mol/cm<sup>3</sup>) of the reaction factor component is decreased relative to the interior on the surface side of the glass substrate, having a total depletion amount (mol/cm<sup>2</sup>) of the reaction factor component of 1.00 x 10<sup>-8</sup>or higher in the surface depletion layer, and having a refractive index (nd) of 1.68 or higher. |