WO2013100423A1 - Laser output device and method - Google Patents

Laser output device and method Download PDF

Info

Publication number
WO2013100423A1
WO2013100423A1 PCT/KR2012/010516 KR2012010516W WO2013100423A1 WO 2013100423 A1 WO2013100423 A1 WO 2013100423A1 KR 2012010516 W KR2012010516 W KR 2012010516W WO 2013100423 A1 WO2013100423 A1 WO 2013100423A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
optical fiber
pumping light
amplifier
amplified
Prior art date
Application number
PCT/KR2012/010516
Other languages
French (fr)
Korean (ko)
Inventor
신우진
Original Assignee
광주과학기술원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 광주과학기술원 filed Critical 광주과학기술원
Publication of WO2013100423A1 publication Critical patent/WO2013100423A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H01S3/06758—Tandem amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
    • H01S5/042—Electrical excitation ; Circuits therefor
    • H01S5/0428—Electrical excitation ; Circuits therefor for applying pulses to the laser
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H01S3/0064—Anti-reflection devices, e.g. optical isolaters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
    • H01S3/09415—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode the pumping beam being parallel to the lasing mode of the pumped medium, e.g. end-pumping

Definitions

  • the present invention relates to a laser output apparatus and method, and more particularly, to a laser output apparatus and method having a narrow pulse width and outputting a high repetition rate pulsed laser light.
  • Pulsed laser refers to a laser that starts and stops in time. Such a pulsed laser can greatly increase the temporal focus of energy. That is, the peak power becomes very large when oscillating an ultra short pulse of pulse width of several ns. Due to such characteristics, pulsed lasers are used for distance measurement, object speed measurement, and the like, and their application fields are gradually expanding. In order for the pulse laser to be applied to more fields, it is required to develop a pulse laser having a narrow pulse width and a high repetition rate.
  • An object of the present invention is to provide a laser output device and method that can be implemented at a high repetition rate while having a narrow pulse width.
  • a pulse drive driver for generating a drive signal; A laser diode driven by a drive signal of the pulse driving driver to oscillate pulsed laser light; And an amplifier configured to amplify the pulsed laser light oscillated from the laser diode, wherein the amplifier comprises: a first pumping light source configured to supply a first pumping light; A wavelength division multiplexer for combining and outputting the pulsed laser light and the first pumped light; And a first amplifier comprising a first optical fiber for amplifying the light output through the wavelength division multiplexer in a single mode.
  • the optical fiber is an optical fiber to which rare earth is added, and is an optical fiber that can be gained by the energy excited by the pump light, and further preferably, the optical fiber is a single mode optical fiber.
  • the laser output device may further include an optical isolator provided at the input terminal and the output terminal of the first amplifier.
  • the amplifier may further include a second amplifier configured to amplify the pulsed laser light amplified by the first amplifier in a multi mode.
  • the second amplifying unit a second pumping light source for supplying a second pumping light;
  • a first optical combiner for coupling the pulsed laser light amplified by the first amplifier and a second pumping light;
  • a second optical fiber for amplifying the light output through the first optical coupler in a multi mode.
  • the amplifier may further include a third amplifier configured to amplify the pulsed laser light amplified by the second amplifier in a multi mode.
  • the third amplifying unit a third pumping light source for supplying a third pumping light;
  • a fourth pumping light source for supplying a fourth pumping light;
  • a second light combiner for coupling the pulsed laser light amplified by the second amplifying unit, the third pumping light and the fourth pumping light;
  • a third optical fiber for amplifying the light output through the second optical coupler in a multi mode.
  • the laser diode is driven by the drive signal of the pulse drive driver to generate a pulsed laser light; Combining the pulsed laser light and the first pumping light supplied by the first pumping light source by a wavelength division multiplexer; And a light coupled to the wavelength division multiplexer is incident to the core of the first optical fiber and amplified in a single mode.
  • the laser output method may include: combining the light amplified by the first optical fiber and the second pumping light supplied by the second pumping light source by a first optical coupler; And the light amplified by the first optical fiber is incident to the core of the second optical fiber and the second pumping light is incident to the inner cladding of the second optical fiber, so that the light amplified by the first optical fiber is amplified in the multi mode. It may further comprise the step.
  • the laser output method may further include combining the light amplified by the second optical fiber with a third pumping light supplied by a third pumping light source and a fourth pumping light supplied by a fourth pumping light source; And the light amplified by the second optical fiber is incident to the core of the third optical fiber, and the third pumping light and the fourth pumping light are incident to the inner cladding of the third optical fiber and amplified by the second optical fiber.
  • the light may further comprise amplifying in multi mode.
  • a pulse laser having a narrow pulse width can be output at a high repetition rate.
  • FIG. 1 is a view showing the overall configuration of a laser output device according to an embodiment of the present invention.
  • FIG 2 is a graph showing the spectral characteristics of the pulsed laser light output by the laser output device according to an embodiment of the present invention.
  • FIG. 3 is a block diagram of a pulse driving driver used in the laser output device according to the present invention.
  • FIG. 4 is a graph illustrating a variable characteristic of a pulse generated by the pulse driving driver of FIG. 3.
  • FIG. 1 is a view showing the overall configuration of a laser output device according to an embodiment of the present invention
  • Figure 2 is a graph showing the spectral characteristics of the pulsed laser light output by the laser output device according to an embodiment of the present invention. .
  • Laser output device is driven by the pulse driving driver 10, the pulse driving driver 10 is output from the laser diode 11 and the laser diode 11 for generating a pulsed laser light It includes an amplifier for amplifying the pulsed laser light.
  • the amplifying unit includes a first amplifying unit 1, a second amplifying unit 2, and a third amplifying unit 3.
  • the pulse driving driver 10 generates a driving signal for driving the laser diode 11.
  • the laser diode 11 is driven by the drive signal of the pulse driving driver 10 to oscillate the pulsed laser light.
  • the wavelength of the pulsed laser light oscillated by the laser diode 11 is several ⁇ band, preferably 1 ⁇ to 2 ⁇ band.
  • the first amplifying unit 1, the second amplifying unit 2, and the third amplifying unit 3 are arranged in series along the optical axis of the pulse laser light, and sequentially output the pulsed laser light output from the laser diode 11. Amplify.
  • the first amplifier 1 includes a first pumping light source 20 for supplying the first pumping light, and a wavelength division multiplexer (WDM) 33 for combining and outputting the pulsed laser light and the first pumping light. And the first optical fiber 50 for amplifying the light output through the wavelength division multiplexer 33.
  • WDM wavelength division multiplexer
  • the first pumping light source 20 supplies the first pumping light for amplifying the pulsed laser light.
  • the first pumping light may be, for example, an erbium laser, and has an intensity of 2 W and a wavelength of 1500 nm band.
  • the wavelength division multiplexer 33 combines the pulsed laser light and the first pumped light.
  • the pulsed laser light and the first pumping light are combined by the wavelength division multiplexer 33 and then incident to the first optical fiber 50.
  • the first optical fiber 50 is disposed at the output terminal of the wavelength division multiplexer 33 and amplifies the light output through the wavelength division multiplexer 33.
  • the first optical fiber 50 amplifies the pulsed laser light by causing excitation light for the light passing through the wavelength division multiplexer 33.
  • the first optical fiber 50 is a rare earth-added optical fiber, preferably a single mode fiber (SMF).
  • the first optical fiber 50 may be an optical fiber to which erbium (Er), neodymium (Nd), tolium (Tm), ytterbium (Yb), and the like are added.
  • the first optical fiber 50 preferably has a length such that the energy of the first pumping light can be sufficiently transmitted to the pulsed laser light.
  • the length of the first optical fiber 50 may be 1m to 3m.
  • the optical isolators 31 and 35 may be provided at the input terminal and the output terminal of the first amplifier 1, respectively.
  • the optical isolators 31 and 35 are provided at the input terminal of the wavelength division multiplexer 33 and the output terminal of the first optical fiber to advance the light in only one direction.
  • the pulsed laser light output from the laser diode 11 is combined with the first pumping light by the wavelength division multiplexer 33 and then transmitted to the core of the first optical fiber 50. At this time, both the pulse laser light and the first pumping light enter the core of the first optical fiber 50.
  • the pulsed laser light is amplified in a single mode in the first optical fiber 50 and then enters the second amplifier 2 through the optical isolator.
  • the first pumping light may be pumped in the reverse direction. That is, the wavelength division multiplexer 33 may be positioned at the output terminal of the first optical fiber 50, and the first pumping light may be incident from the output terminal of the first optical fiber through the wavelength division multiplexer 33.
  • the second amplifier 2 amplifies the light amplified by the first amplifier 1 again.
  • the second amplifier 2 includes a second pumping light source 80, a first optical combiner 37, and a second optical fiber 60.
  • the second pumping light source 80 may be, for example, a pump laser diode, and supplies a second pumping light.
  • the second pumping light has an intensity of 2.5 W and a wavelength in the 700 nm to 800 nm band.
  • One or two or more second pumping light sources 80 may be provided.
  • the first optical coupler 37 combines the pulsed laser light amplified by the first amplifier 1 and the second pumping light.
  • the second optical fiber 60 may be a double clad fiber (DCF) having a double cladding structure including an inner cladding and an outer cladding.
  • the second optical fiber 60 may be an optical fiber to which erbium (Er), neodymium (Nd), tolium (Tm), ytterbium (Yb), and the like are added.
  • the second optical fiber 60 preferably has a length such that the energy of the second pumping light can be sufficiently transmitted to the pulsed laser light.
  • the length of the first optical fiber 50 may be 1m to 3m.
  • the second optical fiber 60 amplifies the light coupled by the first optical coupler 37 in a multi mode.
  • the pulsed laser light incident from the first amplifier 1 is combined with the second pumping light by the first optical combiner 37 and transmitted to the second optical fiber 60.
  • the pulsed laser light is incident on the core of the second optical fiber 60, and the second pumping light is incident on the inner cladding of the second optical fiber 60.
  • the pulsed laser light is amplified in the multi mode by the second optical fiber 60 and then output to the third amplifier 3.
  • the third amplifier 3 amplifies the light amplified by the second amplifier 2 again.
  • the third amplifier 3 includes a third pumping light source 91, a fourth pumping light source 92, a second optical coupler 39, and a third optical fiber 70.
  • the third pumping light source 91 and the fourth pumping light source 92 may be, for example, pump laser diodes, and supply a third pumping light and a fourth pumping light.
  • the third pumping light and the fourth pumping light have an intensity of 5 W and a wavelength in the 700 nm to 800 nm band.
  • the second optical coupler 39 combines the pulsed laser light amplified by the second amplifier 2 with the third pumping light and the fourth pumping light.
  • the third optical fiber 70 may be an optical fiber (DCF) having a double cladding structure composed of an inner cladding and an outer cladding, and may be 3m to 7m long.
  • the third optical fiber 70 may be an optical fiber to which erbium (Er), neodymium (Nd), tolium (Tm), ytterbium (Yb), and the like are added.
  • the third optical fiber 70 amplifies the light coupled by the second optical coupler 39 in a multi mode.
  • the pulsed laser light incident from the second amplifier 2 is combined with the third pumping light and the fourth pumping light by the second optical coupler 39 and transmitted to the third optical fiber 70.
  • the pulsed laser light is incident on the core of the third optical fiber 70, and the third pumping light and the fourth pumping light are incident on the inner cladding of the third optical fiber 70.
  • the pulsed laser light is output after being amplified in the multi mode by the third optical fiber 70.
  • a pulsed laser having a pulse width of 10 nsec can be output at a repetition rate of 100 kHz.
  • a pump stripper 41 is provided at the output terminal of the third amplifier 3.
  • the pump light remover 41 removes the pumping light from the pulsed laser light in which the amplification is completed.
  • an optical isolator and collimator 43 may be provided at the rear end of the pump light remover 41 as necessary.
  • Laser output device includes an amplifier for amplifying the pulsed laser light output from the laser diode includes a first amplifier 1, a second amplifier 2 and the third amplifier 3 do.
  • the amplifier is not limited to the structure shown in this embodiment. In the present invention, even if the amplification part includes only the first amplification part 1, the object of the present invention can be achieved. However, when the amplifier further includes the second amplifier 2 and / or the third amplifier 3, the amplification efficiency of the pulsed laser light may be improved.
  • another amplifying unit for amplifying the pulsed laser light is between the first amplifying unit 1 to the third amplifying unit 3, or after the third amplifying unit 3. 1 may be added to the front end of the amplifier (1).
  • FIG 2 is a graph showing the spectral characteristics of the pulsed laser light output by the laser output device according to an embodiment of the present invention.
  • FIG. 3 is a configuration diagram of the pulse driving driver 10 used in the laser output device according to the present invention
  • FIG. 4 is a graph showing the variable characteristics of pulses generated by the pulse driving driver of FIG.
  • the pulse driving driver 10 shown in FIG. 3 is a direct modulation method, and has a feature of controlling the pulse width and the size of the output regardless of the electric signal input by using a differential switching method of current.
  • the pulse drive driver 10 includes three MOSFETs 12 and 13 and a pulse width variable controller 15. Two MOSFETs 12 connected to the variable pulse width controller 15 generate pulses by differential switching, and a MOSFET 13 to which a driving current is input adjusts the amount of current applied to the laser diode 11. .
  • the pulse driving driver 10 shown in FIG. 3 is capable of driving a peak power of up to 2A, generating a pulse width of about 1.5 nanoseconds to several microseconds, and repeatedly driving pulses up to 20Mhz. As shown in FIG. 4, according to the pulse driving driver 10 shown in FIG. 3, a free pulse width can be varied from about 2 nsec to 1 ⁇ sec, and the width of the output pulse is controlled regardless of the width of the input electric signal.
  • the present invention can be usefully used in various fields by providing a pulse laser having a narrow pulse width and a high repetition rate in a pulse laser used for distance measurement or speed measurement.

Abstract

The present invention relates to a laser output device that outputs high-repetition-rate pulse laser light having a narrow pulse width. The device according to the present invention comprises: a pulse driving driver that generates a driving signal; a laser diode that is driven by the driving signal of the pulse driving driver to oscillate the pulse laser light; and an amplifier that amplifies the pulse laser light oscillated by the laser diode. The amplifier comprises: a first pumping light source that supplies first pumping light; a wavelength division multiplexer that combines the pulse laser light with the first pumping light and outputs the result; and a first amplifier that comprises a first optical fiber which amplifies the light output through the wavelength division multiplexer to a single mode.

Description

레이저 출력 장치 및 방법Laser output device and method
본 발명은 레이저 출력 장치 및 방법에 관한 것으로서, 더욱 상세하게는 좁은 펄스 폭을 가지며 고 반복률의 펄스 레이저광을 출력하는 레이저 출력 장치 및 방법에 관한 것이다.The present invention relates to a laser output apparatus and method, and more particularly, to a laser output apparatus and method having a narrow pulse width and outputting a high repetition rate pulsed laser light.
펄스 레이저는 시간적으로 발진 및 정지가 반복되는 레이저를 말한다. 이와 같은 펄스 레이저는 에너지의 시간적 집속성을 매우 높일 수 있다. 즉, 펄스 폭이 수 ns인 초단광 펄스를 발진시키면 피크 파워는 매우 커진다. 이와 같은 특성 때문에, 펄스 레이저는 거리 측정, 물체의 속도 계측 등에 사용되고 있으며, 그 적용 분야 또한 점차 확대되어 가고 있다. 펄스 레이저가 더욱 많은 분야에 적용되기 위해서는 좁은 펄스 폭을 가지고, 높은 반복률을 가지는 펄스 레이저의 개발이 요구된다. Pulsed laser refers to a laser that starts and stops in time. Such a pulsed laser can greatly increase the temporal focus of energy. That is, the peak power becomes very large when oscillating an ultra short pulse of pulse width of several ns. Due to such characteristics, pulsed lasers are used for distance measurement, object speed measurement, and the like, and their application fields are gradually expanding. In order for the pulse laser to be applied to more fields, it is required to develop a pulse laser having a narrow pulse width and a high repetition rate.
본 발명은 좁은 펄스 폭을 가지면서도 고 반복률로 구현할 수 있는 레이저 출력 장치 및 방법을 제공하는데 그 목적이 있다.An object of the present invention is to provide a laser output device and method that can be implemented at a high repetition rate while having a narrow pulse width.
상기와 같은 과제를 해결하기 위하여, 본 발명은, 구동신호를 발생시키는 펄스구동 드라이버; 상기 펄스구동 드라이버의 구동신호에 의해 구동되어 펄스 레이저광을 발진하는 레이저 다이오드; 및 상기 레이저 다이오드로부터 발진된 상기 펄스 레이저광을 증폭하는 증폭부를 포함하며, 상기 증폭부는, 제1 펌핑광을 공급하는 제1 펌핑 광원; 상기 펄스 레이저광과 상기 제1 펌핑광을 결합하여 출력하는 파장분할 다중화기; 및 상기 파장분할 다중화기를 통해 출력되는 광을 단일 모드로 증폭하는 제1 광섬유를 포함하는 제1 증폭부를 포함하는 레이저 출력 장치를 제공한다.In order to solve the above problems, the present invention, a pulse drive driver for generating a drive signal; A laser diode driven by a drive signal of the pulse driving driver to oscillate pulsed laser light; And an amplifier configured to amplify the pulsed laser light oscillated from the laser diode, wherein the amplifier comprises: a first pumping light source configured to supply a first pumping light; A wavelength division multiplexer for combining and outputting the pulsed laser light and the first pumped light; And a first amplifier comprising a first optical fiber for amplifying the light output through the wavelength division multiplexer in a single mode.
여기서, 상기 광섬유는 희토류가 첨가된 광섬유로 펌프광에 의해 여기된 에너지로 이득을 얻을 수 있는 광섬유인 것이 바람직하며, 나아가, 상기 광섬유는 단일 모드 광섬유인 것이 바람직하다.In this case, the optical fiber is an optical fiber to which rare earth is added, and is an optical fiber that can be gained by the energy excited by the pump light, and further preferably, the optical fiber is a single mode optical fiber.
또한, 상기 레이저 출력 장치는, 상기 제1 증폭부의 입력단 및 출력단에 각각 구비되는 광 아이솔레이터를 더 포함하는 것이 바람직하다.The laser output device may further include an optical isolator provided at the input terminal and the output terminal of the first amplifier.
다른 실시 형태로서, 상기 증폭부는, 상기 제1 증폭부에 의해 증폭된 상기 펄스 레이저광을 멀티 모드로 증폭하는 제2 증폭부를 더 포함할 수 있다. 이때, 상기 제2 증폭부는, 제2 펌핑광을 공급하는 제2 펌핑 광원; 상기 제1 증폭부에 의해 증폭된 펄스 레이저광과 제2 펌핑광을 결합시키는 제1 광 결합기; 및 상기 제1 광 결합기를 통해 출력되는 광을 멀티 모드로 증폭하는 제2 광섬유를 포함할 수 있다.In another embodiment, the amplifier may further include a second amplifier configured to amplify the pulsed laser light amplified by the first amplifier in a multi mode. At this time, the second amplifying unit, a second pumping light source for supplying a second pumping light; A first optical combiner for coupling the pulsed laser light amplified by the first amplifier and a second pumping light; And a second optical fiber for amplifying the light output through the first optical coupler in a multi mode.
또 다른 실시 형태로서, 상기 증폭부는, 상기 제2 증폭부에 의해 증폭된 상기 펄스 레이저광을 멀티 모드로 증폭하는 제3 증폭부를 더 포함할 수 있다. 이때, 상기 제3 증폭부는, 제3 펌핑광을 공급하는 제3 펌핑 광원; 제4 펌핑광을 공급하는 제4 펌핑 광원; 상기 제2 증폭부에 의해 증폭된 펄스 레이저광과 제3 펌핑광 및 제4 펌핑광을 결합시키는 제2 광 결합기; 및 상기 제2 광 결합기를 통해 출력되는 광을 멀티 모드로 증폭하는 제3 광섬유를 포함할 수 있다.In still another embodiment, the amplifier may further include a third amplifier configured to amplify the pulsed laser light amplified by the second amplifier in a multi mode. At this time, the third amplifying unit, a third pumping light source for supplying a third pumping light; A fourth pumping light source for supplying a fourth pumping light; A second light combiner for coupling the pulsed laser light amplified by the second amplifying unit, the third pumping light and the fourth pumping light; And a third optical fiber for amplifying the light output through the second optical coupler in a multi mode.
또한, 본 발명은, 레이저 다이오드가 펄스구동 드라이버의 구동신호에 의해 구동되어 펄스 레이저광을 발진하는 단계; 상기 펄스 레이저광과 제1 펌핑 광원에 의해 공급된 제1 펌핑광이 파장분할 다중화기에 의해 결합되는 단계; 및 파장분할 다중화기에 결합된 광이 제1 광섬유의 코어로 입사되어 단일 모드로 증폭되는 단계를 포함하는 레이저 출력 방법을 제공한다.In addition, the present invention, the laser diode is driven by the drive signal of the pulse drive driver to generate a pulsed laser light; Combining the pulsed laser light and the first pumping light supplied by the first pumping light source by a wavelength division multiplexer; And a light coupled to the wavelength division multiplexer is incident to the core of the first optical fiber and amplified in a single mode.
이때, 상기 레이저 출력 방법은, 상기 제1 광섬유에 의해 증폭된 광과 제2 펌핑 광원에 의해 공급된 제2 펌핑광이 제1 광 결합기에 의해 결합되는 단계; 및 상기 제1 광섬유에 의해 증폭된 광은 제2 광섬유의 코어로 입사되고 상기 제2 펌핑광은 상기 제2 광섬유의 내부 클래딩으로 입사되어, 상기 제1 광섬유에 의해 증폭된 광이 멀티 모드로 증폭되는 단계를 더 포함할 수 있다.In this case, the laser output method may include: combining the light amplified by the first optical fiber and the second pumping light supplied by the second pumping light source by a first optical coupler; And the light amplified by the first optical fiber is incident to the core of the second optical fiber and the second pumping light is incident to the inner cladding of the second optical fiber, so that the light amplified by the first optical fiber is amplified in the multi mode. It may further comprise the step.
또한, 상기 레이저 출력 방법은, 상기 제2 광섬유에 의해 증폭된 광과, 제3 펌핑 광원에 의해 공급된 제3 펌핑광 및 제4 펌핑 광원에 의해 공급된 제4 펌핑광이 결합되는 단계; 및 상기 제2 광섬유에 의해 증폭된 광은 제3 광섬유의 코어로 입사되고 상기 제3 펌핑광 및 상기 제4 펌핑광은 상기 제3 광섬유의 내부 클래딩으로 입사되어, 상기 제2 광섬유에 의해 증폭된 광이 멀티 모드로 증폭되는 단계를 더 포함할 수 있다.The laser output method may further include combining the light amplified by the second optical fiber with a third pumping light supplied by a third pumping light source and a fourth pumping light supplied by a fourth pumping light source; And the light amplified by the second optical fiber is incident to the core of the third optical fiber, and the third pumping light and the fourth pumping light are incident to the inner cladding of the third optical fiber and amplified by the second optical fiber. The light may further comprise amplifying in multi mode.
본 발명의 일 실시예에 의하면, 고 반복률로 좁은 펄스 폭을 가지는 펄스 레이저를 출력할 수 있다.According to one embodiment of the present invention, a pulse laser having a narrow pulse width can be output at a high repetition rate.
도 1은 본 발명의 일 실시예에 따른 레이저 출력 장치의 전체적인 구성을 도시하는 도면이다.1 is a view showing the overall configuration of a laser output device according to an embodiment of the present invention.
도 2는 본 발명의 일 실시예에 따른 레이저 출력 장치에 의해 출력되는 펄스 레이저광의 스펙트럼 특성을 나타내는 그래프이다.2 is a graph showing the spectral characteristics of the pulsed laser light output by the laser output device according to an embodiment of the present invention.
도 3은 본 발명에 따른 레이저 출력 장치에 이용되는 펄스구동 드라이버의 구성도이다.3 is a block diagram of a pulse driving driver used in the laser output device according to the present invention.
도 4는 도 3의 펄스구동 드라이버에 의해 발생되는 펄스의 가변 특성을 나타내는 그래프이다.4 is a graph illustrating a variable characteristic of a pulse generated by the pulse driving driver of FIG. 3.
이하에서는 첨부한 도면을 참조하여 본 발명의 바람직한 실시예를 자세히 설명한다. 우선 각 도면의 구성요소들에 참조부호를 부가함에 있어서, 동일한 구성요소들에 대해서는 비록 다른 도면상에 표시되더라도 가능한 한 동일한 부호를 가지도록 하고 있음에 유의해야 한다. 또한, 본 발명을 설명함에 있어, 관련된 공지 구성 또는 기능에 대한 구체적인 설명이 본 발명의 요지를 흐릴 수 있다고 판단되는 경우에는 그 상세한 설명은 생략한다.Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.
도 1은 본 발명의 일 실시예에 따른 레이저 출력 장치의 전체적인 구성을 도시하는 도면이고, 도 2는 본 발명의 일 실시예에 따른 레이저 출력 장치에 의해 출력되는 펄스 레이저광의 스펙트럼 특성을 나타내는 그래프이다.1 is a view showing the overall configuration of a laser output device according to an embodiment of the present invention, Figure 2 is a graph showing the spectral characteristics of the pulsed laser light output by the laser output device according to an embodiment of the present invention. .
본 발명의 일 실시예에 따른 레이저 출력 장치는, 펄스구동 드라이버(10), 펄스구동 드라이버(10)에 의해 구동되어 펄스 레이저광을 발진하는 레이저 다이오드(11) 및 레이저 다이오드(11)로부터 출력된 펄스 레이저광을 증폭하는 증폭부를 포함한다. 증폭부는 제1 증폭부(1), 제2 증폭부(2) 및 제3 증폭부(3)를 포함한다. Laser output device according to an embodiment of the present invention, is driven by the pulse driving driver 10, the pulse driving driver 10 is output from the laser diode 11 and the laser diode 11 for generating a pulsed laser light It includes an amplifier for amplifying the pulsed laser light. The amplifying unit includes a first amplifying unit 1, a second amplifying unit 2, and a third amplifying unit 3.
펄스구동 드라이버(10)는 레이저 다이오드(11)를 구동시키기 위한 구동신호를 발생시킨다. 레이저 다이오드(11)는 펄스구동 드라이버(10)의 구동신호에 의해 구동되어 펄스 레이저광을 발진시킨다. 레이저 다이오드(11)에 의해 발진되는 펄스 레이저광의 파장은 수 ㎛ 대역, 바람직하게는 1㎛ 내지 2㎛ 대역이다.The pulse driving driver 10 generates a driving signal for driving the laser diode 11. The laser diode 11 is driven by the drive signal of the pulse driving driver 10 to oscillate the pulsed laser light. The wavelength of the pulsed laser light oscillated by the laser diode 11 is several 탆 band, preferably 1 탆 to 2 탆 band.
제1 증폭부(1), 제2 증폭부(2), 및 제3 증폭부(3)는 펄스 레이저광의 광축을 따라 직렬로 배치되며, 레이저 다이오드(11)로부터 출력된 펄스 레이저광을 순차적으로 증폭한다.The first amplifying unit 1, the second amplifying unit 2, and the third amplifying unit 3 are arranged in series along the optical axis of the pulse laser light, and sequentially output the pulsed laser light output from the laser diode 11. Amplify.
제1 증폭부(1)는, 제1 펌핑광을 공급하는 제1 펌핑 광원(20), 펄스 레이저광과 제1 펌핑광을 결합하여 출력하는 파장분할 다중화기(Wavelength Divisional Multiplexer, WDM)(33) 및 파장분할 다중화기(33)를 통해 출력되는 광을 증폭하는 제1 광섬유(50)를 포함한다. The first amplifier 1 includes a first pumping light source 20 for supplying the first pumping light, and a wavelength division multiplexer (WDM) 33 for combining and outputting the pulsed laser light and the first pumping light. And the first optical fiber 50 for amplifying the light output through the wavelength division multiplexer 33.
제1 펌핑 광원(20)은 펄스 레이저광을 증폭시키기 위한 제1 펌핑광을 공급한다. 제1 펌핑광은, 예컨대 어븀 레이저일 수 있으며, 2W의 세기 및 1500nm 대역의 파장을 가진다. The first pumping light source 20 supplies the first pumping light for amplifying the pulsed laser light. The first pumping light may be, for example, an erbium laser, and has an intensity of 2 W and a wavelength of 1500 nm band.
파장분할 다중화기(33)는 펄스 레이저광과 제1 펌핑광을 결합시킨다. 펄스 레이저광 및 제1 펌핑광은 파장분할 다중화기(33)에 의해 결합된 후 제1 광섬유(50)로 입사된다.The wavelength division multiplexer 33 combines the pulsed laser light and the first pumped light. The pulsed laser light and the first pumping light are combined by the wavelength division multiplexer 33 and then incident to the first optical fiber 50.
제1 광섬유(50)는 파장분할 다중화기(33)의 출력단에 배치되며, 파장분할 다중화기(33)를 통해 출력되는 광을 증폭한다. 제1 광섬유(50)는 파장분할 다중화기(33)를 통과한 광에 대해 여기광을 유발시킴으로써 펄스 레이저광을 증폭시킨다. 제1 광섬유(50)은 희토류 첨가 광섬유로서, 단일 모드 광섬유(Single Mode Fiber, SMF)인 것이 바람직하다. 예컨대, 제1 광섬유(50)는 어븀(Er), 네오디뮴(Nd), 톨륨(Tm), 이터븀(Yb) 등이 첨가된 광섬유일 수 있다.The first optical fiber 50 is disposed at the output terminal of the wavelength division multiplexer 33 and amplifies the light output through the wavelength division multiplexer 33. The first optical fiber 50 amplifies the pulsed laser light by causing excitation light for the light passing through the wavelength division multiplexer 33. The first optical fiber 50 is a rare earth-added optical fiber, preferably a single mode fiber (SMF). For example, the first optical fiber 50 may be an optical fiber to which erbium (Er), neodymium (Nd), tolium (Tm), ytterbium (Yb), and the like are added.
또한, 제1 광섬유(50)는 제1 펌핑광의 에너지가 펄스 레이저광에 충분히 전달될 수 있는 길이를 가지는 것이 바람직하다. 제1 광섬유(50)의 길이는 1m 내지 3m일 수 있다.In addition, the first optical fiber 50 preferably has a length such that the energy of the first pumping light can be sufficiently transmitted to the pulsed laser light. The length of the first optical fiber 50 may be 1m to 3m.
바람직하게는, 제1 증폭부(1)의 입력단 및 출력단에는 광 아이솔레이터(isolator)(31, 35)가 각각 구비될 수 있다. 광 아이솔레이터(31, 35)는 파장분할 다중화기(33)의 입력단 및 제1 광섬유의 출력단에 구비되어 광을 한쪽 방향으로만 진행시킨다. Preferably, the optical isolators 31 and 35 may be provided at the input terminal and the output terminal of the first amplifier 1, respectively. The optical isolators 31 and 35 are provided at the input terminal of the wavelength division multiplexer 33 and the output terminal of the first optical fiber to advance the light in only one direction.
레이저 다이오드(11)로부터 출력된 펄스 레이저광은 파장분할 다중화기(33)에 의해 제1 펌핑광과 결합된 후 제1 광섬유(50)의 코어에 전달된다. 이때, 펄스 레이저광과 제1 펌핑광은 모두 제1 광섬유(50)의 코어로 입사한다. 펄스 레이저광은 제1 광섬유(50)에서 단일 모드로 증폭된 후 광 아이솔레이터를 거쳐 제2 증폭부(2)에 입사한다. The pulsed laser light output from the laser diode 11 is combined with the first pumping light by the wavelength division multiplexer 33 and then transmitted to the core of the first optical fiber 50. At this time, both the pulse laser light and the first pumping light enter the core of the first optical fiber 50. The pulsed laser light is amplified in a single mode in the first optical fiber 50 and then enters the second amplifier 2 through the optical isolator.
한편, 본 발명의 다른 실시예에서는, 제1 펌핑광은 역방향으로 펌핑될 수도 있다. 즉, 파장분할 다중화기(33)가 제1 광섬유(50)의 출력단에 위치하고, 제1 펌핑광이 파장분할 다중화기(33)를 통해 제1 광섬유의 출력단으로부터 입사되도록 구성될 수도 있다. On the other hand, in another embodiment of the present invention, the first pumping light may be pumped in the reverse direction. That is, the wavelength division multiplexer 33 may be positioned at the output terminal of the first optical fiber 50, and the first pumping light may be incident from the output terminal of the first optical fiber through the wavelength division multiplexer 33.
제2 증폭부(2)는 제1 증폭부(1)에 의해 증폭된 광을 다시 증폭시킨다. 제2 증폭부(2)는, 제2 펌핑 광원(80), 제1 광 결합기(Combiner)(37) 및 제2 광섬유(60)를 포함한다.The second amplifier 2 amplifies the light amplified by the first amplifier 1 again. The second amplifier 2 includes a second pumping light source 80, a first optical combiner 37, and a second optical fiber 60.
제2 펌핑 광원(80)은, 예컨대 펌프 레이저 다이오드일 수 있으며, 제2 펌핑광을 공급한다. 제2 펌핑광은 2.5W의 세기 및 700nm 내지 800nm 대역의 파장을 가진다. 제2 펌핑 광원(80)은 하나 또는 두개 이상이 구비될 수 있다.The second pumping light source 80 may be, for example, a pump laser diode, and supplies a second pumping light. The second pumping light has an intensity of 2.5 W and a wavelength in the 700 nm to 800 nm band. One or two or more second pumping light sources 80 may be provided.
제1 광 결합기(37)는 제1 증폭부(1)에 의해 증폭된 펄스 레이저광과 제2 펌핑광을 결합시킨다.The first optical coupler 37 combines the pulsed laser light amplified by the first amplifier 1 and the second pumping light.
제2 광섬유(60)는 내부 클래딩과 외부 클래딩으로 이루어지는 이중 클래딩(double cladding) 구조를 가지는 광섬유(Double Clad Fiber, DCF)일 수 있다. 예컨대, 제2 광섬유(60)는 어븀(Er), 네오디뮴(Nd), 톨륨(Tm), 이터븀(Yb) 등이 첨가된 광섬유일 수 있다. 또한, 제2 광섬유(60)는 제2 펌핑광의 에너지가 펄스 레이저광에 충분히 전달될 수 있는 길이를 가지는 것이 바람직하다. 제1 광섬유(50)의 길이는 1m 내지 3m일 수 있다.The second optical fiber 60 may be a double clad fiber (DCF) having a double cladding structure including an inner cladding and an outer cladding. For example, the second optical fiber 60 may be an optical fiber to which erbium (Er), neodymium (Nd), tolium (Tm), ytterbium (Yb), and the like are added. In addition, the second optical fiber 60 preferably has a length such that the energy of the second pumping light can be sufficiently transmitted to the pulsed laser light. The length of the first optical fiber 50 may be 1m to 3m.
제2 광섬유(60)는 제1 광 결합기(37)에 의해 결합된 광을 멀티 모드로 증폭한다. The second optical fiber 60 amplifies the light coupled by the first optical coupler 37 in a multi mode.
제1 증폭부(1)로부터 입사된 펄스 레이저광은 제1 광 결합기(37)에 의해 제2 펌핑광과 결합되어 제2 광섬유(60)로 전달된다. 이때, 펄스 레이저광은 제2 광섬유(60)의 코어로 입사되고, 제2 펌핑광은 제2 광섬유(60)의 내부 클래딩으로 입사된다. 펄스 레이저광은 제2 광섬유(60)에 의해 멀티 모드로 증폭된 후 제3 증폭부(3)로 출력된다. The pulsed laser light incident from the first amplifier 1 is combined with the second pumping light by the first optical combiner 37 and transmitted to the second optical fiber 60. In this case, the pulsed laser light is incident on the core of the second optical fiber 60, and the second pumping light is incident on the inner cladding of the second optical fiber 60. The pulsed laser light is amplified in the multi mode by the second optical fiber 60 and then output to the third amplifier 3.
제3 증폭부(3)는 제2 증폭부(2)에 의해 증폭된 광을 다시 증폭시킨다. 제3 증폭부(3)는, 제3 펌핑 광원(91), 제4 펌핑 광원(92), 제2 광 결합기(39) 및 제3 광섬유(70)를 포함한다.The third amplifier 3 amplifies the light amplified by the second amplifier 2 again. The third amplifier 3 includes a third pumping light source 91, a fourth pumping light source 92, a second optical coupler 39, and a third optical fiber 70.
제3 펌핑 광원(91) 및 제4 펌핑 광원(92)은, 예컨대 펌프 레이저 다이오드일 수 있으며, 제3 펌핑광 및 제4 펌핑광을 공급한다. 제3 펌핑광 및 제4 펌핑광은 5W의 세기 및 700nm 내지 800nm 대역의 파장을 가진다.The third pumping light source 91 and the fourth pumping light source 92 may be, for example, pump laser diodes, and supply a third pumping light and a fourth pumping light. The third pumping light and the fourth pumping light have an intensity of 5 W and a wavelength in the 700 nm to 800 nm band.
제2 광 결합기(39)는 제2 증폭부(2)에 의해 증폭된 펄스 레이저광과 제3 펌핑광 및 제4 펌핑광을 결합시킨다.The second optical coupler 39 combines the pulsed laser light amplified by the second amplifier 2 with the third pumping light and the fourth pumping light.
제3 광섬유(70)는, 내부 클래딩과 외부 클래딩으로 이루어지는 이중 클래딩 구조를 가지는 광섬유(DCF)일 수 있으며, 3m 내지 7m 길이로 이루어질 수 있다. 예컨대, 제3 광섬유(70)는 어븀(Er), 네오디뮴(Nd), 톨륨(Tm), 이터븀(Yb) 등이 첨가된 광섬유일 수 있다. 제3 광섬유(70)는 제2 광 결합기(39)에 의해 결합된 광을 멀티 모드로 증폭한다. The third optical fiber 70 may be an optical fiber (DCF) having a double cladding structure composed of an inner cladding and an outer cladding, and may be 3m to 7m long. For example, the third optical fiber 70 may be an optical fiber to which erbium (Er), neodymium (Nd), tolium (Tm), ytterbium (Yb), and the like are added. The third optical fiber 70 amplifies the light coupled by the second optical coupler 39 in a multi mode.
제2 증폭부(2)로부터 입사된 펄스 레이저광은 제2 광 결합기(39)에 의해 제3 펌핑광 및 제4 펌핑광과 결합되어 제3 광섬유(70)로 전달된다. 이때, 펄스 레이저광은 제3 광섬유(70)의 코어로 입사되고, 제3 펌핑광 및 제4 펌핑광은 제3 광섬유(70)의 내부 클래딩으로 입사된다. 펄스 레이저광은 제3 광섬유(70)에 의해 멀티 모드로 증폭된 후 출력된다. 도 2에 도시된 펄스 레이저광의 스펙트럼에서 볼 수 있듯이, 본 발명에 따른 레이저 출력 장치에 의하면, 100kHz의 반복률로 10nsec의 펄스 폭을 가지는 펄스 레이저를 출력할 수 있다.The pulsed laser light incident from the second amplifier 2 is combined with the third pumping light and the fourth pumping light by the second optical coupler 39 and transmitted to the third optical fiber 70. In this case, the pulsed laser light is incident on the core of the third optical fiber 70, and the third pumping light and the fourth pumping light are incident on the inner cladding of the third optical fiber 70. The pulsed laser light is output after being amplified in the multi mode by the third optical fiber 70. As can be seen from the spectrum of the pulsed laser light shown in Fig. 2, according to the laser output device according to the present invention, a pulsed laser having a pulse width of 10 nsec can be output at a repetition rate of 100 kHz.
바람직하게는, 제3 증폭부(3)의 출력단에는 펌프광 제거기(Pump Stripper)(41)가 구비되는 것이 바람직하다. 펌프광 제거기(41)는 증폭이 완료된 펄스 레이저광으로부터 펌핑광을 제거한다.Preferably, a pump stripper 41 is provided at the output terminal of the third amplifier 3. The pump light remover 41 removes the pumping light from the pulsed laser light in which the amplification is completed.
또한, 펌프광 제거기(41)의 후단에는 필요에 따라 광 아이솔레이터 및 콜리메이터(43)가 구비될 수도 있다.In addition, an optical isolator and collimator 43 may be provided at the rear end of the pump light remover 41 as necessary.
본 발명의 일 실시예에 따른 레이저 출력 장치는 레이저 다이오드로부터 출력되는 펄스 레이저광을 증폭하는 증폭부가 제1 증폭부(1), 제2 증폭부(2) 및 제3 증폭부(3)를 포함한다. 그러나, 증폭부는 본 실시예에 도시된 구조에 한정되지 아니한다. 본 발명에 있어서, 증폭부는 제1 증폭부(1)만을 포함하더라도 본 발명의 목적은 달성될 수 있다. 다만, 증폭부가 제2 증폭부(2) 및/또는 제3 증폭부(3)를 더 포함할 경우 펄스 레이저광의 증폭 효율이 향상될 수 있다. 나아가, 본 실시예에는 도시되지 않았으나, 펄스 레이저광을 증폭하기 위한 또 다른 증폭부가 제1 증폭부(1) 내지 제3 증폭부(3)의 사이, 제3 증폭부(3)의 후단 또는 제1 증폭부(1)의 전단에 추가될 수 있다.Laser output device according to an embodiment of the present invention includes an amplifier for amplifying the pulsed laser light output from the laser diode includes a first amplifier 1, a second amplifier 2 and the third amplifier 3 do. However, the amplifier is not limited to the structure shown in this embodiment. In the present invention, even if the amplification part includes only the first amplification part 1, the object of the present invention can be achieved. However, when the amplifier further includes the second amplifier 2 and / or the third amplifier 3, the amplification efficiency of the pulsed laser light may be improved. Furthermore, although not shown in the present embodiment, another amplifying unit for amplifying the pulsed laser light is between the first amplifying unit 1 to the third amplifying unit 3, or after the third amplifying unit 3. 1 may be added to the front end of the amplifier (1).
도 2는 본 발명의 일 실시예에 따른 레이저 출력 장치에 의해 출력되는 펄스 레이저광의 스펙트럼 특성을 나타내는 그래프이다.2 is a graph showing the spectral characteristics of the pulsed laser light output by the laser output device according to an embodiment of the present invention.
다음으로는 레이저 다이오드를 구동하기 위한 펄스구동 드라이버의 일례를 설명한다.Next, an example of a pulse drive driver for driving a laser diode will be described.
도 3은 본 발명에 따른 레이저 출력 장치에 이용되는 펄스구동 드라이버(10)의 구성도이며, 도 4는 도 3의 펄스구동 드라이버에 의해 발생되는 펄스의 가변 특성을 나타내는 그래프이다.3 is a configuration diagram of the pulse driving driver 10 used in the laser output device according to the present invention, and FIG. 4 is a graph showing the variable characteristics of pulses generated by the pulse driving driver of FIG.
도 3에 도시된 펄스구동 드라이버(10)는 직접 변조 방식이며, 전류의 차동 스위칭 방법을 이용함으로써 입력되는 전기신호와 관계 없이 펄스 폭 및 출력의 크기를 제어할 수 있는 특징이 있다. 펄스구동 드라이버(10)는 세 개의 모스펫(MOSFET)(12)(13)와 펄스폭 가변 제어기(15)를 포함한다. 펄스폭 가변 제어기(15)와 연결되는 두 개의 모스펫(12)은 차동 스위칭에 의해 펄스를 생성하고, 구동 전류가 입력되는 모스펫(13)은 레이저 다이오드(11)에 인가되는 전류의 양을 조정한다. 도 3에 도시된 펄스구동 드라이버(10)는 최대 2A의 첨두 전력 구동이 가능하고, 약 1.5 나노초에서 수 마이크로초의 펄스 폭 생성이 가능하며, 최대 20Mhz까지 펄스의 반복 구동이 가능하다. 도 4에 나타난 바와 같이, 도 3에 도시된 펄스구동 드라이버(10)에 의하면 약 2nsec에서 1μsec까지 자유로운 펄스 폭의 가변이 가능하며 출력된 펄스의 폭은 입력 전기신호의 폭과 관계 없이 제어된다. The pulse driving driver 10 shown in FIG. 3 is a direct modulation method, and has a feature of controlling the pulse width and the size of the output regardless of the electric signal input by using a differential switching method of current. The pulse drive driver 10 includes three MOSFETs 12 and 13 and a pulse width variable controller 15. Two MOSFETs 12 connected to the variable pulse width controller 15 generate pulses by differential switching, and a MOSFET 13 to which a driving current is input adjusts the amount of current applied to the laser diode 11. . The pulse driving driver 10 shown in FIG. 3 is capable of driving a peak power of up to 2A, generating a pulse width of about 1.5 nanoseconds to several microseconds, and repeatedly driving pulses up to 20Mhz. As shown in FIG. 4, according to the pulse driving driver 10 shown in FIG. 3, a free pulse width can be varied from about 2 nsec to 1 μsec, and the width of the output pulse is controlled regardless of the width of the input electric signal.
이상의 설명은 본 발명의 기술 사상을 예시적으로 설명한 것에 불과한 것으로서, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자라면 본 발명의 본질적인 특성에서 벗어나지 않는 범위에서 다양한 수정, 변경 및 치환이 가능할 것이다. 따라서 본 발명에 개시된 실시예는 본 발명의 기술 사상을 한정하기 위한 것이 아니라 설명하기 위한 것이고, 이러한 실시예에 의하여 본 발명의 기술 사상의 범위가 한정되는 것은 아니다. 본 발명의 보호 범위는 아래의 청구범위에 의하여 해석되어야 하며, 그와 동등한 범위 내에 있는 모든 기술 사상은 본 발명의 권리범위에 포함되는 것으로 해석되어야 할 것이다.The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art will be able to make various modifications, changes, and substitutions without departing from the essential characteristics of the present invention. . Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.
본 발명은 거리 측정이나 속도 측정 등에 사용되는 펄스 레이저에 있어서, 좁은 펄스 폭과 높은 반복률을 가지는 펄스 레이저를 제공하여 다양한 분야에 유용하게 이용될 수 있다. The present invention can be usefully used in various fields by providing a pulse laser having a narrow pulse width and a high repetition rate in a pulse laser used for distance measurement or speed measurement.

Claims (11)

  1. 구동신호를 발생시키는 펄스구동 드라이버;A pulse driving driver for generating a driving signal;
    상기 펄스구동 드라이버의 구동신호에 의해 구동되어 펄스 레이저광을 발진하는 레이저 다이오드; 및 A laser diode driven by a drive signal of the pulse driving driver to oscillate pulsed laser light; And
    상기 레이저 다이오드로부터 발진된 상기 펄스 레이저광을 증폭하는 증폭부An amplifier for amplifying the pulsed laser light oscillated from the laser diode
    를 포함하며,Including;
    상기 증폭부는, 제1 펌핑광을 공급하는 제1 펌핑 광원과, 상기 펄스 레이저광과 상기 제1 펌핑광을 결합하여 출력하는 파장분할 다중화기, 및 상기 파장분할 다중화기를 통해 출력되는 광을 단일 모드로 증폭하는 제1 광섬유를 포함하는 제1 증폭부를 포함하는 것을 특징으로 하는 레이저 출력 장치.The amplifying unit may include a first pumping light source for supplying a first pumping light, a wavelength division multiplexer for combining and outputting the pulsed laser light and the first pumping light, and a light output through the wavelength division multiplexer in a single mode. And a first amplifier comprising a first optical fiber to amplify the laser.
  2. 제1항에 있어서,The method of claim 1,
    상기 광섬유는 라만이득을 얻을 수 있는 광섬유인 것을 특징으로 하는 레이저 출력 장치.The optical fiber is a laser output device, characterized in that the optical fiber capable of obtaining Raman gain.
  3. 제2항에 있어서,The method of claim 2,
    상기 광섬유는 단일 모드 광섬유인 것을 특징으로 하는 레이저 출력 장치.And the optical fiber is a single mode optical fiber.
  4. 제1항에 있어서,The method of claim 1,
    상기 제1 증폭부의 입력단 및 출력단에 각각 구비되는 광 아이솔레이터를 더 포함하는 것을 특징으로 하는 레이저 출력 장치.And an optical isolator provided at each of an input terminal and an output terminal of the first amplifier unit.
  5. 제1항에 있어서,The method of claim 1,
    상기 증폭부는, 상기 제1 증폭부에 의해 증폭된 상기 펄스 레이저광을 멀티 모드로 증폭하는 제2 증폭부를 더 포함하는 것을 특징으로 하는 레이저 출력 장치.The amplifier unit further comprises a second amplifier unit for amplifying the pulsed laser light amplified by the first amplifier in a multi-mode.
  6. 제5항에 있어서,The method of claim 5,
    상기 제2 증폭부는, 제2 펌핑광을 공급하는 제2 펌핑 광원과, 상기 제1 증폭부에 의해 증폭된 펄스 레이저광과 제2 펌핑광을 결합시키는 제1 광 결합기, 및 상기 제1 광 결합기를 통해 출력되는 광을 멀티 모드로 증폭하는 제2 광섬유를 포함하는 것을 특징으로 하는 레이저 출력 장치.The second amplifier includes a second pumping light source for supplying a second pumping light, a first light combiner for coupling the pulsed laser light and the second pumping light amplified by the first amplifier, and the first light combiner. Laser output device comprising a second optical fiber for amplifying the light output through the multi-mode.
  7. 제5항에 있어서,The method of claim 5,
    상기 증폭부는, 상기 제2 증폭부에 의해 증폭된 상기 펄스 레이저광을 멀티 모드로 증폭하는 제3 증폭부를 더 포함하는 것을 특징으로 하는 레이저 출력 장치.The amplifier unit further comprises a third amplifier for amplifying the pulsed laser light amplified by the second amplifier in a multi mode.
  8. 제7항에 있어서,The method of claim 7, wherein
    상기 제3 증폭부는, 제3 펌핑광을 공급하는 제3 펌핑 광원과, 제4 펌핑광을 공급하는 제4 펌핑 광원과, 상기 제2 증폭부에 의해 증폭된 펄스 레이저광과 제3 펌핑광 및 제4 펌핑광을 결합시키는 제2 광 결합기, 및 상기 제2 광 결합기를 통해 출력되는 광을 멀티 모드로 증폭하는 제3 광섬유를 포함하는 것을 특징으로 하는 레이저 출력 장치.The third amplifier includes a third pumping light source for supplying a third pumping light, a fourth pumping light source for supplying a fourth pumping light, a pulse laser light and a third pumping light amplified by the second amplifying unit, And a third optical coupler for coupling the fourth pumping light, and a third optical fiber for amplifying the light output through the second optical coupler in a multi-mode.
  9. 레이저 다이오드가 펄스구동 드라이버의 구동신호에 의해 구동되어 펄스 레이저광을 발진하는 단계;Driving a laser diode to drive a pulsed laser light by a driving signal of a pulse driving driver;
    상기 펄스 레이저광과 제1 펌핑 광원에 의해 공급된 제1 펌핑광이 파장분할 다중화기에 의해 결합되는 단계; 및Combining the pulsed laser light and the first pumping light supplied by the first pumping light source by a wavelength division multiplexer; And
    파장분할 다중화기에 결합된 광이 제1 광섬유의 코어로 입사되어 단일 모드로 증폭되는 단계;Light coupled to the wavelength division multiplexer is incident on the core of the first optical fiber and amplified in a single mode;
    를 포함하는 레이저 출력 방법.Laser output method comprising a.
  10. 제9항에 있어서,The method of claim 9,
    상기 레이저 출력 방법은,The laser output method,
    상기 제1 광섬유에 의해 증폭된 광과 제2 펌핑 광원에 의해 공급된 제2 펌핑광이 제1 광 결합기에 의해 결합되는 단계; 및Combining the light amplified by the first optical fiber and the second pumping light supplied by a second pumping light source by a first optical coupler; And
    상기 제1 광섬유에 의해 증폭된 광은 제2 광섬유의 코어로 입사되고 상기 제2 펌핑광은 상기 제2 광섬유의 내부 클래딩으로 입사되어, 상기 제1 광섬유에 의해 증폭된 광이 멀티 모드로 증폭되는 단계Light amplified by the first optical fiber is incident to the core of the second optical fiber and the second pumping light is incident to the inner cladding of the second optical fiber, so that the light amplified by the first optical fiber is amplified in a multi-mode step
    를 더 포함하는 것을 특징으로 하는 레이저 출력 방법.Laser output method further comprising a.
  11. 제10항에 있어서,The method of claim 10,
    상기 레이저 출력 방법은,The laser output method,
    상기 제2 광섬유에 의해 증폭된 광과, 제3 펌핑 광원에 의해 공급된 제3 펌핑광 및 제4 펌핑 광원에 의해 공급된 제4 펌핑광이 결합되는 단계; 및Combining the light amplified by the second optical fiber with a third pumping light supplied by a third pumping light source and a fourth pumping light supplied by a fourth pumping light source; And
    상기 제2 광섬유에 의해 증폭된 광은 제3 광섬유의 코어로 입사되고 상기 제3 펌핑광 및 상기 제4 펌핑광은 상기 제3 광섬유의 내부 클래딩으로 입사되어, 상기 제2 광섬유에 의해 증폭된 광이 멀티 모드로 증폭되는 단계 Light amplified by the second optical fiber is incident to the core of the third optical fiber and the third pumping light and the fourth pumping light are incident to the inner cladding of the third optical fiber, the light amplified by the second optical fiber Steps to be amplified in this multi mode
    를 더 포함하는 것을 특징으로 하는 레이저 출력 방법.Laser output method further comprising a.
PCT/KR2012/010516 2011-12-30 2012-12-06 Laser output device and method WO2013100423A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20110147664 2011-12-30
KR10-2011-0147664 2011-12-30

Publications (1)

Publication Number Publication Date
WO2013100423A1 true WO2013100423A1 (en) 2013-07-04

Family

ID=48697820

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2012/010516 WO2013100423A1 (en) 2011-12-30 2012-12-06 Laser output device and method

Country Status (1)

Country Link
WO (1) WO2013100423A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109802295A (en) * 2019-03-04 2019-05-24 武汉锐科光纤激光技术股份有限公司 A kind of pulse optical fiber

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010111163A (en) * 2000-06-08 2001-12-17 오길록 1530㎚-band pumped l-band erbium doped fiber amplifier
KR100701551B1 (en) * 2005-09-23 2007-03-30 한국과학기술연구원 Fiber raman amplifier
JP2007335522A (en) * 2006-06-13 2007-12-27 Sumitomo Electric Ind Ltd Fiber laser device and laser processing method
JP2010171260A (en) * 2009-01-23 2010-08-05 Sumitomo Electric Ind Ltd Pulse modulation method and optical fiber laser

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010111163A (en) * 2000-06-08 2001-12-17 오길록 1530㎚-band pumped l-band erbium doped fiber amplifier
KR100701551B1 (en) * 2005-09-23 2007-03-30 한국과학기술연구원 Fiber raman amplifier
JP2007335522A (en) * 2006-06-13 2007-12-27 Sumitomo Electric Ind Ltd Fiber laser device and laser processing method
JP2010171260A (en) * 2009-01-23 2010-08-05 Sumitomo Electric Ind Ltd Pulse modulation method and optical fiber laser

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109802295A (en) * 2019-03-04 2019-05-24 武汉锐科光纤激光技术股份有限公司 A kind of pulse optical fiber

Similar Documents

Publication Publication Date Title
US8081376B2 (en) Multi-stage fiber amplifier to suppress Raman scattered light
US7738514B2 (en) Very high power pulsed fiber laser
WO2015167115A1 (en) Optical fiber laser device and optical fiber laser providing method
EP1950852A3 (en) High power optical apparatus employing large-mode-area, multimode, gain-producing optical fibers
JP6144705B2 (en) High-power single-mode ytterbium fiber laser system using a single-mode neodymium fiber source
KR20000019993A (en) Light source of optical fiber having high output and wide band
Nilsson et al. Cladding-pumped Raman fiber amplifier
WO2013100423A1 (en) Laser output device and method
JP2010171260A (en) Pulse modulation method and optical fiber laser
CN102130416B (en) Laser apparatus
CN102280803A (en) Pulse fiber amplifier
WO2012165495A1 (en) Laser device
JP3599543B2 (en) Optical fiber amplifier
Codemard et al. High-brightness, pulsed, cladding-pumped Raman fiber source at 1660 nm
CN112313844A (en) Light source device and optical amplifier
CN106159649A (en) A kind of separation amplifying fiber Optical Maser System
KR20130078627A (en) Device and method of outputting laser
Oh et al. Increased pulsed amplifier efficiency by manipulating the fiber dopant distribution
CN105140761B (en) A kind of narrow pulse fiber laser
US20230178954A1 (en) Integrated optical ampilification systems
Sobon et al. Three-stage all-in-fiber MOPA source operating at 1550 nm with 20W output power
Shirakawa et al. High-brightness 210 µJ pulsed Raman fiber source
JP3296329B2 (en) Fluorescent lamp type laterally pumped optical fiber and optical fiber amplifier using the same
WO2013179492A1 (en) Optical amplifier
JP2013191876A (en) Optical fiber laser

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12862277

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12862277

Country of ref document: EP

Kind code of ref document: A1