Abstract: A desktop thermal lens microscope apparatus can detect a chemical reaction in a micro spatial region within a glass chip, or the like, more conveniently and at any given place. The desktop thermal lens microscope apparatus has small laser light sources such as semiconductor lasers as an excitation light source and a probe light source. Since an excitation light source system (P), a probe light source (Q), and a thermal lens microscope optical system (R, S, T) are integrally provided in a single housing, the size of the desktop thermal lens microscope is as small as that of a desktop microscope.

Abstract: A laser light is applied to the surface of an object to be processed and formed with a coating film and at least an upper portion of the coating film is removed through abrasion, by using an energy density variable optical system capable of applying the laser light to the surface of the object and varying an energy density of the laser light on the surface of the object. The coating film can be removed without using chemicals.

Abstract: A laser light is applied to the surface of an object to be processed and formed with a coating film and at least an upper portion of the coating film is removed through abrasion, by using an energy density variable optical system capable of applying the laser light to the surface of the object and varying an energy density of the laser light on the surface of the object. The coating film can be removed without using chemicals.

Abstract: In a particle measuring apparatus using laser Doppler velocimeter, it is intended to facilitate calibration of the apparatus for measuring the shape of particle. Laser beams passing through a first intersecting region M1 which is a measuring region are intersected again by using condenser lenses 21 and 22, and a second intersecting region M2 is formed. The intersecting region M2 is magnified by a magnifying lens 23. An optical bundle fiber 24 is brought closer from afar to the lens 23, and set at a position where AC component is not formed. As a result, the size of the incident portion of each optical fiber 24i and the fringe interval d.sub.f may be matched equivalently, so that the absolute value of the shape of particle may be obtained.