JPH068911U - Optical fiber laser device - Google Patents

Abstract

(57) [Summary] [Objective] The present invention aims to provide an optical fiber laser device having great durability against shock waves of a pulsed laser. A buffer coating resin layer 4 is provided outside an optical fiber in which a cladding layer 2 made of a low refractive index resin is provided outside a core material 1 made of quartz, and the end portion of the buffer coating resin layer 4 and a base are provided. 5 and 6 screws respectively
Then, an adhesive is applied to the threaded portion and the base 5 is screwed onto the end of the optical fiber.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical fiber laser device having great durability against a shock wave of a pulse laser.

[0002]

[Prior art]

 A part of the energy of the laser emitted from a laser device, particularly a pulsed laser device, which is compressed in a pulsed state and emitted for a very short time, becomes a shock wave, and sometimes when a fragile material such as glass, sapphire, or quartz is in front of the shock wave. , Even destroying it. Conventionally, as an optical fiber laser device, a cap 3 made of metal or plastic is provided at the tip of an optical fiber in which a cladding layer 2 made of low-refractive-index resin is provided outside a core 1 made of quartz shown in FIG. The attached one is used, but due to the energy of the pulse laser transmitted through the optical fiber, the base 3 for holding the lens attached to the tip of the optical fiber sometimes falls off due to the shock wave. The pulsed laser is used for PDT (photodynamic ceraby), which is called "photodynamic ceraby", because of the high energy compressed into the pulse, and it is especially used for the transmission of laser energy to the affected part in the body cavity. For this reason, the use of optical fiber laser devices that utilize optical fibers is essential. Therefore, it is a great obstacle that the base 3 at the tip of the optical fiber laser device inserted into the affected part in the body cavity should fall off due to the shock wave of the pulse laser, and must be absolutely avoided.

[0003]

[Problems to be solved by the device]

 It is an object of the present invention to provide an optical fiber laser device without the above defects.

[0004]

[Means for Solving the Problems] The present invention has been made to solve the above problems, and is an optical device in which a cladding layer made of a low-refractive-index resin is provided on the outside of a core part using a conventionally known quartz. A structure in which a buffer coating resin layer is formed on the outside of the fiber, the tip of the optical fiber and a metal or plastic, etc. are threaded into the base and adhesive is applied to the threaded part to screw them together. Is.

[Action]

 According to the above structure, an optical fiber laser device having great durability against a shock wave of a pulse laser can be obtained.

FIG. 2 shows an embodiment of the present invention, in which 1 is a core portion of pure quartz through which a laser beam passes, 2 is a clad layer of 425 μm in diameter made of a resin having a low refractive index, and 4 is a diameter of Tefzel resin. It is a 730 μm buffer resin layer. The buffer coating resin layer 4 is firmly bonded to the cladding layer 2 and forms a part of the optical fiber line. According to the present invention, the screws 6 and 7 are respectively cut into the ends of the optical fiber having the buffer coating resin layer 4 and the cap 5 made of metal or plastic containing the lens and the like. After applying an adhesive such as an epoxy adhesive to the two, they are screwed together, and after the adhesive is hardened, a strong and reliable base and optical fiber connection is obtained. In the embodiment, a dice is used on the optical fiber side to provide a screw 6 of M0.9 and P = 0.225, and also to the inner surface of the die 5 made of SUS304 stainless steel with an internal light condensing lens and having an inner diameter of 600 μm. A screw 7 with M0.9 and P = 0.225 was applied over 3 mm, and prior to screwing the base 5 and the optical fiber, EP330 epoxy resin manufactured by Cemedine Co. was applied to both screw portions. The base was screwed into the optical fiber and left at room temperature for 24 hours to complete the curing. As a comparative example, the same optical fiber was not threaded, and the inner surface of the die with one inner diameter of 730 μm was not threaded, and an optical fiber laser device was prepared by only applying and curing the same epoxy adhesive. Table 1 shows the test results of the impact tensile strength of both, and it is clearly shown that the structure of the present invention has high strength against impact tensile strength and has little variation and high reliability.

[Table 1] FIGS. 3A and 3B are structural views showing another embodiment in which plastic chips 8 and 9 (also serving as light diffusion chips) are used in place of the metal caps, respectively.

[0006]

[Effect of device]

 Since the optical fiber laser device according to the present invention is provided with the buffer coating layer 4, the optical fiber is protected, and the bending durability is high, and the optical fiber laser device has great durability against the shock wave of the pulse laser. A fiber laser device is obtained.

[Brief description of drawings]

FIG. 1 is a side view in which a part of a conventional optical fiber laser device is cut away.

FIG. 2 is a partially cutaway side view of an embodiment of the present invention.

FIG. 3 is a partially cutaway side view of a different embodiment of the present invention.

[Explanation of symbols]

 1 core part 2 clad layer 3,5 base 4 buffer coating resin layer 6,7 screw 8,9 chip

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsu Hirano 1126 No. 1126, Ichinomachi, Hamamatsu-shi, Shizuoka Prefecture (72) Inventor Masami Osawa 6767, Tamagawa Village, Hiki Group, Saitama Prefecture

Claims (1)

[Scope of utility model registration request] 1. A buffer coating resin layer is formed on the outside of an optical fiber in which a clad layer made of a low refractive index resin is provided on the outside of a core portion made of quartz, and the tip end portion of the optical fiber and metal or plastic or the like. An optical fiber laser device characterized in that each of the caps is threaded, an adhesive is applied to the threaded portion, and the two are screwed together.