Abstract:
The present invention relates to an active compensation system of a chirp pulse amplification system having an optical fiber as an amplification medium. The chirp pulse amplification system including a diffraction grating pulse dilator compares and compensates the position of the beam emitted from the pulse dilator and an optical fiber amplification load. The present invention comprises a position measuring unit for detecting the position of the beam emitted therefrom and a compensation unit for compensating to match the positions of the two beams detected by the position measuring unit via controlling them optically.
Abstract:
The present invention relates to an entire normal dispersion optical fiber laser resonator having a repetition rate of less than 10 MHz which is a mode locked through a saturation absorber and a nonlinear polarization rotation phenomenon, comprising a laser diode which outputs a laser pump light; a wavelength divider which couples the laser pump light outputted in the laser diode inside the resonator; a yitterbium addition optical fiber which amplifies a pulse of the resonator that penetrates the wavelength divider using the coupled pump light; a first wavelength plate (1/4) and a first wavelength plate (1/2) which convert the polarization of a laser light that penetrates the optical fiber; a first polarization light divider which separates the polarization of the laser light that penetrates each of the first wavelength plates; a birefringence determination based optical filter and an interference filter which respectively filters the penetration band of the light that penetrates the first polarization light divider; an optical shielding device which blocks a part of the light in the polarization that penetrates the interference filter; a second wavelength plate (1/2) which converts the polarization of the light that penetrates the optical shielding device; a second polarization light divider which separates the polarization of the laser light that penetrates the second wavelength plate; a second wavelength plate (1/4) which converts the polarization of the light that penetrates the second polarization light divider; a lens which penetrates the light that penetrates the second wavelength plate; a saturation absorber which induces a mode locking of the light that penetrates the lens; a third wavelength plate (1/4) which converts the polarization of the mode locked laser light; and a single mode optical fiber which induces the low repetition rate of the laser light that penetrates the third wavelength plate, wherein the laser light outputted in the laser diode is sequentially penetrated.
Abstract:
본 발명은 펨토초 레이저에 의해 나노 보이드 어레이 형성을 통한 절단방법에 관한 것으로, 극초단 펨토초 레이저를 개구수(NA)가 0.7 내지 0.95를 가지는 집광렌즈로 집광시켜 투명재료 또는 기판에 조사함으로써, 비선형 커렌즈(Kerr Lens) 현상에 의한 자체 집속(Self Focusing)과 다중광자이온화(Multi-Photon Ionization) 현상에 의한 플라즈마 디포커싱(Plasma Defocusing) 되도록 하여 기판에 나노 보이드 어레이(Nano-Void Array)를 형성한 후 절단하는 것을 특징으로 한다. 이와 같이 구성되는 본 발명은 나노 보이드 어레이를 형성하여 투명재료의 절단 및 가공 효율을 향상시킬 수 있고, 기존에 불가능한 얇은 투명재료의 효율적인 절단 및 가공을 가능한 이점이 있다.
Abstract:
PURPOSE: A fiber laser systems with the repetition rate of 0.1-30 mhz and specimen manufacturing using the same are provided to implement a stable manual mode lock by simultaneously applying an NPE(Nonlinear Polarization Rotation) phenomenon and a saturable absorber. CONSTITUTION: Pump light generated from a laser diode(301) enters a resonator through a wavelength splitter(300). The pump light is absorbed in a ytterbium additional optical fiber(303). The light letting the resonator resonating passes through a wave plate(304) and a light shielding unit(305). One polarizing component is amplified in the ytterbium additional optical fiber. The amplified polarizing component is outputted through an opto-coupler(302). The outputted light reduces a repetition rate through a pulse extractor(306).
Abstract:
PURPOSE: A cutting device and method using ultra-short pulse laser and water freezing are provided to prevent the residue on a work piece by forming a void on the underside of the work piece using ultra-short pulse laser and reduce cut scraps by using stress generated from the freezing of water in the void. CONSTITUTION: A cutting device using ultra-short pulse laser and water freezing comprises a laser source, a base plate(104), a vapor supply unit(108), and a cooling gas supply unit(109). The laser source condenses a laser(100) through a condensing lens(110) to a work piece(102) and outputs ultra-short pulse laser to form a void(103) in the work piece. The base plate comprises a vapor supply part(106) and a cooling gas supply part(107) on both sides thereof. The cooling gas supply unit supplies cooling gas to the cooling gas supply part. A crack is generated in the work piece by the laser of the laser source. Vapor and cooling gas are successively supplied and the work piece is cut by expansion resulting from the freezing of vapor.
Abstract:
PURPOSE: A cutting device through the combination of characteristics of a reformed surface according to depth is provided to maintain high surface precision and maximize machining accuracy by freely regulating the size of a reformed area through pulse width control. CONSTITUTION: A cutting device through the combination of characteristics of a reformed surface according to depth comprises a laser source(100), a plurality of mirrors(200-203), a first condensing lens(400), a dispersion control unit(300), and a second condensing lens(401). The laser source outputs pulse laser. The plurality of mirrors split a laser beam output from the laser source or determine the directivity of the laser beam. The first condensing lens condenses one of the laser beams split through the mirrors to irradiate a work piece(500). The dispersion control unit controls the dispersion of another one of the laser beams. The second condensing lens condenses the laser beam dispersed by the dispersion control unit to irradiate the work piece.
Abstract:
본 발명은 포화흡수체와 비선형 편광 회전 현상을 통해 모드 동기가 되는 10 MHz 이하의 반복률을 갖는 전체 정상 분산 광섬유 레이저 공진기에 관한 것으로, 레이저 pump 광을 출력하는 레이저 다이오드, 상기 레이저 다이오드에서 출력되는 레이저 pump 광을 공진기 내부로 couple시키는 파장분할기, 상기 파장분할기를 투과한 공진기의 펄스를 couple된 pump 광을 이용해 증폭시키는 이터븀 첨가 광섬유, 상기 광섬유를 투과한 레이저 광의 편광을 변환시키는 제 1 파장판(1/4)과 제 1파장판(1/2), 상기 제 1파장판을 각각 투과한 레이저 광의 편광을 분리하는 제 1편광 광 분할기, 상기 제 1편광 광 분할기를 투과한 광의 투과 대역을 각각 필터링 하는 복굴절 결정 기반 광학 필터와 간섭 필터, 상기 간섭 필터를 투과한 편광 중에서 일부 광을 차단하는 광차폐기, 상기 광차폐기를 투과한 광의 편광을 변환시키는 제 2 파장판(1/2), 상기 제 2파장판을 투과하는 레이저 광의 편광을 분리하는 제 2편광 광 분할기, 상기 제 2편광 광 분할기를 투과한 광 편광을 변환시키는 제 2파장판(1/4), 상기 제 2파장판을 투과한 광을 투과시키는 렌즈, 상기 렌즈를 투과한 광의 모드잠금을 유도하는 포화 흡수체, 모드잠금된 레이저 광의 편광 광을 변환시키는 제 3파장판(1/4) 및 상기 제 3파장판을 투과한 레이저 광의 낮은 반복률을 유도하는 단일모드 광섬유를 포함하며, 상기 레이저 다이오드에서 출력되는 레이저 광이 순차적으로 투과하도록 구성되는 것을 특징으로 한다.