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A tunable light source equipped with an optical parametric amplifier (OPA) placed in a cavity for performing an optical parametric oscillation (OPO) driven by a pump beam at a pump frequency selected within a certain range such that the OPO is driven near degeneracy. An adjustment mechanism adjusts

A tunable light source equipped with an optical parametric amplifier (OPA) placed in a cavity for performing an optical parametric oscillation (OPO) driven by a pump beam at a pump frequency selected within a certain range such that the OPO is driven near degeneracy. An adjustment mechanism adjusts the pump frequency within a wavelength tuning range to select a gain spectrum of the OPO and a spectral control mechanism sets a resonant frequency of the cavity within that gain spectrum. Thus, only one of the idler and signal beams within the passband set by the narrowband tuner is supported inside the cavity. Other nonlinear frequency conversion operations can also be performed within the cavity in conjunction with the OPO. The light source can be operated in cw, near-cw and pulsed operation modes as a broadly tunable narrowband source covering a wavelength window of 250 nm.

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A tunable light source equipped with an optical parametric amplifier (OPA) placed in a cavity for performing an optical parametric oscillation (OPO) driven by a pump beam at a pump frequency selected within a certain range such that the OPO is driven near degeneracy. An adjustment mechanism adjusts

A tunable light source equipped with an optical parametric amplifier (OPA) placed in a cavity for performing an optical parametric oscillation (OPO) driven by a pump beam at a pump frequency selected within a certain range such that the OPO is driven near degeneracy. An adjustment mechanism adjusts the pump frequency within a wavelength tuning range to select a gain spectrum of the OPO and a spectral control mechanism sets a resonant frequency of the cavity within that gain spectrum. Thus, only one of the idler and signal beams within the passband set by the narrowband tuner is supported inside the cavity. Other nonlinear frequency conversion operations can also be performed within the cavity in conjunction with the OPO. The light source can be operated in cw, near-cw and pulsed operation modes as a broadly tunable narrowband source covering a wavelength window of 250 nm. uctive layer in order to apply a driving voltage to the electrochromic layer, the metal foil terminals extending between the opposed glass plate and the end of the lower transparent conductive layer and the end of the insulated portion of the lower transparent conductive layer. 2. A solid-state electrochromic device according to claim 1, wherein the metal foil terminals are made of any one of copper and aluminum foils. 3. A solid-state electrochromic device according to claim 1, wherein the metal foil terminals have undergone anti-corrosive treatment. 4. A mirror system using a solid-state electrochromic device, the electrochromic device comprising: a metal reflective coating formed into filmy shape on a glass substrate; a lower transparent conductive layer formed into filmy shape on the metal reflective coating, partially provided with a groove, and separated into two portions by the groove; an electrochromic layer layered on the lower transparent conductive layer; an upper transparent conductive layer formed into filmy shape over a portion insulated with the groove of the lower transparent conductive layer, and a top of the electrochromic layer; and a sealant and opposed glass plate laminated on the upper transparent conductive layer, wherein metal foil terminals made of a metal foil to which an electrically conductive adhesive material is applied are bonded to an end of the lower transparent conductive layer and an end of the insulated portion of the lower transparent conductive layer in order to apply a driving voltage to the electrochromic layer. 5. A CRT display including: a glass panel; and a filter layer formed on a front face of the glass panel, the filter layer being comprised of a solid-state electrochromic device, wherein the solid-state electrochromic device uses the glass panel for an opposed glass plate, and includes a lower transparent conductive layer and metal foil terminals to which an electrically conductive adhesive material is applied, and the metal foil terminals are located at an end portion of the lower transparent conductive layer. 6. A CRT display according to claim 5, wherein the filter layer comprised of the electrochromic device includes: a lower transparent conductive layer formed into filmy shape on a glass substrate, partially provided with a groove, and separated into two portions by the groove; an electrochromic layer layered on the lower transparent conductive layer; an upper transparent conductive layer formed into filmy shape over a portion insulated with the groove of the lower transparent conductive layer, and a top of the electrochromic layer; and a sealant and opposed glass plate laminated on the upper transparent conductive layer, wherein metal foil terminals made of a metal foil to which an electrically conductive adhesive material is applied are bonded to an end of the lower transparent conductive layer and an end of the insulated portion of the lower transparent conductive layer in order to apply a driving voltage to the electrochromic layer. a converting apparatus comprising: a receiver receiving a parallax image string data with its header file data, said parallax image string data comprising a plurality of images of an object, said plurality of images corresponding to different viewing points, a viewing point converter performing a viewing point conversion process on said received parallax image string data based on information contained in said header file data, and said header file data contains information related to conditions that are used for capturing said plurality of images from said different viewing points. 4. The image data converting apparatus according to claim 3, wherein: said viewing point converter generates a light exposure image string data after the viewing point conversion process, and said header file data is revised to further include information regarding condition used for exposure process to produce a holographic stereogram when the viewing point conversion process is performed. 5. The image data converting apparatus according to claim 3, wherein: said receiver receives said parallax image string data with its header file data through a network. 6. A holographic stereogram printing apparatus comprising: a receiver receiving a parallax image string data with its header file data, said parallax image string data comprising a plurality of images of an object, said plurality of images corresponding to different viewing points, said header file data containing at least information related to conditions that are used for capturing said plurality of images from said different viewing points, a viewing point converter performing a viewing point conversion process on said received parallax image string data based on information contained in said header file data to generate a light exposure image string data, and a holographic stereogram generator for producing a holographic stereogram using said light exposure image string data. 7. The holographic stereogram printing apparatus according to claim 6, wherein: said receiver receives said parallax image string data with its header file data through a network. 8. A holographic stereogram printing apparatus comprising: a receiver receiving a light exposure image string data with its header file data, said header file data containing at least information regarding condition used for exposure process to produce a holographic stereogram, and a holographic stereogram generator for producing a holographic stereogram using said light exposure image string data based on said information contained in said header file data, wherein said header file data contains information related to conditions that are used for capturing a plurality of images of an object from different viewing points. 9. The holographic stereogram printing apparatus according to claim 8, wherein: said receiver receives said light exposure image string data with its header file data through a network. 10. An image data transmission method comprising: generating a parallax image string data, said parallax image string data including a plurality of images of an object, said plurality of images corresponding to different viewing points, attaching a header file data necessary for performing a viewing point conversion process to said parallax image string data, said header file data containing information related to conditions that are used for capturing said plurality of images from said different viewing points. 11. The image data transmission method according to claim 10, wherein: said header file data is configured in such a way that another information regarding a process to be applied on said parallax image string data can be added to said header file data. 12. An image data transmission method comprising: receiving a parallax image string data along with header file data, said parallax image string data including a plurality of images of an object, said plurality of images correspon