Abstract: The purpose of the present invention is to make it possible to output stable light by optimizing the wavelength conversion efficiency in a wavelength conversion element without employing an optical detection device such as a photo diode in a laser light source device. A fundamental light wave emitted from a semiconductor laser (2) is wavelength converted by a wavelength conversion element (5) and is emitted therefrom. A lighting circuit (20) supplies electric power for the aforementioned semiconductor laser (2) to turn on the semiconductor laser (2). A control unit (21) controls the operation of the device while controlling the amount of power supplied to a heater means (7) such that the wavelength conversion element (5) reaches a temperature at which optimum wavelength conversion efficiency is acquired.

Abstract: The wavelength of fundamental wave light emitted from a semiconductor laser is converted by a wavelength conversion element, and the wavelength-converted light is emitted. A power supply circuit feeds electric power to the semiconductor laser. A control part controls an amount of electric power to be fed to a heater such that the wavelength conversion element becomes a temperature that optimizes the wavelength conversion efficiency. Temperatures detected by an element temperature detector and a light source part temperature detector are introduced to the control part, and the control part takes a wavelength conversion element temperature, at which a temperature detected by the light source part temperature detector is minimum, as a set temperature that makes the wavelength conversion efficiency optimal, and feedback-controls the wavelength conversion element temperature such that the wavelength conversion element temperature is at the set temperature by controlling the heating quantity of the heater.

Abstract: The wavelength of fundamental wave light emitted from a semiconductor laser is converted by a wavelength conversion element, and the wavelength-converted light is emitted. A power supply circuit feeds electric power to the semiconductor laser. A control part controls an amount of electric power to be fed to a heater such that the wavelength conversion element becomes a temperature that optimizes the wavelength conversion efficiency. Temperatures detected by an element temperature detector and a light source part temperature detector are introduced to the control part, and the control part takes a wavelength conversion element temperature, at which a temperature detected by the light source part temperature detector is minimum, as a set temperature that makes the wavelength conversion efficiency optimal, and feedback-controls the wavelength conversion element temperature such that the wavelength conversion element temperature is at the set temperature by controlling the heating quantity of the heater.

Abstract: The purpose of the present invention is to make it possible to output stable light by optimizing the wavelength conversion efficiency in a wavelength conversion element without employing an optical detection device such as a photo diode in a laser light source device. A fundamental light wave emitted from a semiconductor laser (2) is wavelength converted by a wavelength conversion element (5) and is emitted therefrom. A lighting circuit (20) supplies electric power for the aforementioned semiconductor laser (2) to turn on the semiconductor laser (2). A control unit (21) controls the operation of the device while controlling the amount of power supplied to a heater means (7) such that the wavelength conversion element (5) reaches a temperature at which optimum wavelength conversion efficiency is acquired.

Abstract: An extra high pressure mercury lamp that includes an arc tube, which includes a light emission section enclosing 0.2 mg/mm3 or more of mercury, sealing sections that respectively extend from both ends of the light emission section, a pair of electrodes that face each other in the light emission section, wherein an electrode axis portion of each electrode is held by the sealing portion, and a metallic foil that is buried in the sealing section and that is electrically connected with the electrode axis portion, wherein the metallic foil has a covering portion fixed to the electrode axis portion so as to roll up the electrode axis portion; an extended portion that extends towards the outside of a tube axis without being connected with the electrode axis portion; and a main body portion that extends from the extended portion.

Abstract: An extra high pressure mercury lamp that includes an arc tube, which includes a light emission section enclosing 0.2 mg/mm3 or more of mercury, sealing sections that respectively extend from both ends of the light emission section, a pair of electrodes that face each other in the light emission section, wherein an electrode axis portion of each electrode is held by the sealing portion, and a metallic foil that is buried in the sealing section and that is electrically connected with the electrode axis portion, wherein the metallic foil has a covering portion fixed to the electrode axis portion so as to roll up the electrode axis portion; an extended portion that extends towards the outside of a tube axis without being connected with the electrode axis portion; and a main body portion that extends from the extended portion.