A method includes providing a collection of particulate material and forming a first article therefrom. Forming the first article includes forming an outer shell with an outer surface that defines an outer periphery of the first article; forming a relief area of the first article that supports the outer shell, including forming a relief void in the relief area; and collecting a collection of the particulate material within the outer shell during formation of the first article. Moreover, the method includes encasing the first article with an outer member. The outer member defines an internal cavity with an internal surface that corresponds to the outer surface of the outer shell. The method further includes heating, which deforms the first article selectively at the relief void.

Provided is a method for producing a crystal fiber which can suppress the occurrence of stress birefringence even while distributing a light emission center so as to concentrate on a cross-sectional middle portion. The method for producing a crystal fiber comprises the steps of: using, as a preform, the crystal fiber comprising a light emission center that volatilizes from a melted portion upon the melting of a crystal, and heating a portion or a plurality of portions of the side of the preform, whereby the portion or the plurality of portions of the preform are melted such that only a given amount of the inside of the portion or the plurality of portions of the preform is not melted, to form the melted portion; and sequentially transferring the melted portion in the longitudinal direction of the preform, and cooling the melted portion, whereby the melted portion is continuously recrystallized to form a recrystallized region.

Provided is a method for producing a crystal fiber which can suppress the occurrence of stress birefringence even while distributing a light emission center so as to concentrate on a cross-sectional middle portion. The method for producing a crystal fiber comprises the steps of: using, as a preform, the crystal fiber comprising a light emission center that volatilizes from a melted portion upon the melting of a crystal, and heating a portion or a plurality of portions of the side of the preform, whereby the portion or the plurality of portions of the preform are melted such that only a given amount of the inside of the portion or the plurality of portions of the preform is not melted, to form the melted portion; and sequentially transferring the melted portion in the longitudinal direction of the preform, and cooling the melted portion, whereby the melted portion is continuously recrystallized to form a recrystallized region.

The object of the present invention is to provide a method for growing a large-size crystal by laser assisted heating and a dedicated device. The device comprises a laser core heating device, a xenon lamp surface heating device, a base, a vacuum cavity and etc. When a crystal is prepared, seeding and crystal growing are implemented by a xenon lamp-laser synergetic heating mode. According to the present invention, the structure and functions of the dedicated device are designed to introduce, at the center of a float melting zone, a laser heating source having high precision and strong controllability, so that a composite heating mode with xenon lamp surface heating and laser core heating is formed; and combined with the control of process, the method and the device solve the difficulty in growing a large-size test crystal bar and enable the growth of the crystal bar having a diameter up to 35 mm so as to facilitate engineering uses.

The object of the present invention is to provide a method for growing a large-size crystal by laser assisted heating and a dedicated device. The device comprises a laser core heating device, a xenon lamp surface heating device, a base, a vacuum cavity and etc. When a crystal is prepared, seeding and crystal growing are implemented by a xenon lamp-laser synergetic heating mode. According to the present invention, the structure and functions of the dedicated device are designed to introduce, at the center of a float melting zone, a laser heating source having high precision and strong controllability, so that a composite heating mode with xenon lamp surface heating and laser core heating is formed; and combined with the control of process, the method and the device solve the difficulty in growing a large-size test crystal bar and enable the growth of the crystal bar having a diameter up to 35 mm so as to facilitate engineering uses.

Provided is a method for producing a crystal fiber which can suppress the occurrence of stress birefringence even while distributing a light emission center so as to concentrate on a cross-sectional middle portion. The method for producing a crystal fiber comprises the steps of: using, as a preform, the crystal fiber comprising a light emission center that volatilizes from a melted portion upon the melting of a crystal, and heating a portion or a plurality of portions of the side of the preform, whereby the portion or the plurality of portions of the preform are melted such that only a given amount of the inside of the portion or the plurality of portions of the preform is not melted, to form the melted portion; and sequentially transferring the melted portion in the longitudinal direction of the preform, and cooling the melted portion, whereby the melted portion is continuously recrystallized to form a recrystallized region.

Provided is a method for producing a crystal fiber which can suppress the occurrence of stress birefringence even while distributing a light emission center so as to concentrate on a cross-sectional middle portion. The method for producing a crystal fiber comprises the steps of: using, as a preform, the crystal fiber comprising a light emission center that volatilizes from a melted portion upon the melting of a crystal, and heating a portion or a plurality of portions of the side of the preform, whereby the portion or the plurality of portions of the preform are melted such that only a given amount of the inside of the portion or the plurality of portions of the preform is not melted, to form the melted portion; and sequentially transferring the melted portion in the longitudinal direction of the preform, and cooling the melted portion, whereby the melted portion is continuously recrystallized to form a recrystallized region.

To provide a single crystal production apparatus capable of efficiently producing a single crystal of relatively high quality, by cooling a melting zone, the device including: a heating part that forms the melting zone from a raw material by irradiation of light; and a supporting part that supports the melting zone in a non-contact manner.

To provide a single crystal production apparatus capable of efficiently producing a single crystal of relatively high quality, by cooling a melting zone, the device including: a heating part that forms the melting zone from a raw material by irradiation of light; and a supporting part that supports the melting zone in a non-contact manner.

The object of the present invention is to provide a method for growing a large-size crystal by laser assisted heating and a dedicated device. The device comprises a laser core heating device, a xenon lamp surface heating device, a base, a vacuum cavity and etc. When a crystal is prepared, seeding and crystal growing are implemented by a xenon lamp-laser synergetic heating mode. According to the present invention, the structure and functions of the dedicated device are designed to introduce, at the center of a float melting zone, a laser heating source having high precision and strong controllability, so that a composite heating mode with xenon lamp surface heating and laser core heating is formed; and combined with the control of process, the method and the device solve the difficulty in growing a large-size test crystal bar and enable the growth of the crystal bar having a diameter up to 35 mm so as to facilitate engineering uses.