WO2014193062A1 - 버스트 모드 레이저 발생 장치 및 방법 - Google Patents
버스트 모드 레이저 발생 장치 및 방법 Download PDFInfo
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- WO2014193062A1 WO2014193062A1 PCT/KR2013/012244 KR2013012244W WO2014193062A1 WO 2014193062 A1 WO2014193062 A1 WO 2014193062A1 KR 2013012244 W KR2013012244 W KR 2013012244W WO 2014193062 A1 WO2014193062 A1 WO 2014193062A1
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1301—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers
- H01S3/1302—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers by all-optical means, e.g. gain-clamping
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- 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
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
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- 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
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10015—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by monitoring or controlling, e.g. attenuating, the input signal
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- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/0607—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying physical parameters other than the potential of the electrodes, e.g. by an electric or magnetic field, mechanical deformation, pressure, light, temperature
- H01S5/0608—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying physical parameters other than the potential of the electrodes, e.g. by an electric or magnetic field, mechanical deformation, pressure, light, temperature controlled by light, e.g. optical switch
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- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/0607—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying physical parameters other than the potential of the electrodes, e.g. by an electric or magnetic field, mechanical deformation, pressure, light, temperature
- H01S5/0608—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying physical parameters other than the potential of the electrodes, e.g. by an electric or magnetic field, mechanical deformation, pressure, light, temperature controlled by light, e.g. optical switch
- H01S5/0609—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying physical parameters other than the potential of the electrodes, e.g. by an electric or magnetic field, mechanical deformation, pressure, light, temperature controlled by light, e.g. optical switch acting on an absorbing region, e.g. wavelength convertors
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- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
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- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/4012—Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms
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- 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
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- H—ELECTRICITY
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- 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
- H01S3/0092—Nonlinear frequency conversion, e.g. second harmonic generation [SHG] or sum- or difference-frequency generation outside the laser cavity
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
- H01S3/2375—Hybrid lasers
Definitions
- the present invention relates to a burst mode laser generating apparatus and method, and more particularly, to a burst mode laser generating apparatus and method that can implement a burst mode in a wavelength conversion laser by adjusting the oscillation line width and polarization state of the oscillation light source.
- burst mode arbitrary pulse train modulation
- This burst mode implementation is difficult to implement due to the problem of optical amplifier damage due to over-amplification when using a high-energy fiber amplifier for high power energy acquisition in a pulsed fiber laser.
- Korean Patent Laid-Open Publication No. 2012-0122102 includes a laser source for outputting light pulses and a laser source for outputting continuous light, thereby controlling the duration of the continuous light so that the profile of the optical pulse train is constant.
- a pulsed laser device that can be controlled, and a control method thereof.
- the technology currently used to implement a burst mode in the fiber laser is implementing a burst mode by installing an optical modulator at the final output stage to prevent damage to the fiber amplifier and to ensure the stability of the laser system.
- this technology uses expensive additional elements for driving the optical modulator, which makes the system complicated, expensive, and impairs the flexible operating environment and high durability of the fiber laser, and high power consumption for driving the optical modulator. There is a disadvantage.
- An object of the present invention is to provide a burst mode laser generating apparatus and method capable of implementing a burst mode in a wavelength conversion laser by adjusting the oscillation line width and / or polarization state of the oscillation light source. .
- the present invention provides a trigger signal generator for generating a burst trigger signal; A first light source generating a pulsed first optical signal; A second light source generating a pulsed second optical signal; An optical switch for selecting and outputting any one of the first optical signal and the second optical signal according to the burst trigger signal; An optical amplifier for amplifying the optical signal output from the optical switch; And a wavelength converter for wavelength converting the optical signal amplified by the optical amplifier, wherein the first optical signal and the second optical signal have at least one of an oscillation line width and a polarization state.
- the first light source and the second light source may be provided as laser diodes.
- the oscillation line width of the first optical signal may be smaller than the oscillation line width of the second optical signal.
- the line width of the first optical signal may be 1 nm or less, and the line width of the second optical signal may be at least 10 nm.
- the first optical signal may be polarized in a predetermined direction, and the second optical signal may not be polarized.
- the optical switch selects and transmits the first optical signal to the optical amplifier when the burst trigger signal is high, and transmits the second optical signal when the burst trigger signal is low. It can be selected and delivered to an optical amplifier.
- the wavelength converter may convert the amplified optical signal into a nonlinear wavelength.
- the present invention for achieving the above object, (a) generating a first optical signal with a narrow oscillation line width and polarized, and a second optical signal with a wide oscillation line width and unpolarized; (b) generating a burst trigger signal; (c) selecting and outputting any one of the first optical signal and the second optical signal according to the burst trigger signal; (d) amplifying the output optical signal; And (e) non-linear wavelength conversion of the amplified optical signal.
- the burst trigger signal may be generated in the same form according to the waveform of the desired burst mode.
- step (c) when the burst trigger signal is high, the first optical signal is selected and output. When the burst trigger signal is low, the second optical signal is selected and output. Can be.
- the oscillation line width and the polarization state of the oscillation light source may be adjusted to implement the burst mode in the wavelength conversion laser.
- optical fiber laser system of the all-optical fiber type can be manufactured, there is an effect that can have all the advantages of excellent operating environment, durability, and light weight of the optical fiber laser system.
- FIG. 1 is a view schematically showing the configuration of a burst mode laser generating device according to an embodiment of the present invention.
- FIG. 2 is a flowchart of a burst mode laser generation method according to an embodiment of the present invention.
- Burst mode implementation in conventional wavelength conversion lasers is also implemented in the same way as conventional pulsed fiber laser burst mode.
- the burst mode can be implemented by using the pulse signal of the same size having different oscillation line width and polarization characteristic.
- FIG. 1 is a view schematically showing the configuration of a burst mode laser generating device according to an embodiment of the present invention.
- a burst mode laser generation device 1 includes a trigger signal generator 100 generating a burst trigger signal 110 and a first optical signal 210 having a pulse shape. ), The first laser diode 200 generating the pulse width, the second laser diode 300 generating the pulsed second optical signal 310, and the first optical signal 210 according to the burst trigger signal 110. And an optical switch 400 for selecting and outputting any one of the second optical signals 310, an optical amplifier 500 for amplifying the optical signal output from the optical switch 400, and amplification in the optical amplifier 500. And a wavelength converter 600 for wavelength converting the optical signal.
- the trigger signal generator 100 generates a burst trigger signal 110.
- the burst trigger signal 110 is generated in this same form according to the waveform of the desired burst mode (any pulse train modulation).
- the first laser diode 200 and the second laser diode 300 generate the first optical signal 210 and the second optical signal 310 in the form of pulses, respectively, and generate the first optical signal 210 and the first optical signal 210.
- the two optical signals 310 are input to the optical switch 400.
- the first optical signal 210 and the second optical signal 310 is the same size, characterized in that at least one of the oscillation line width and the polarization state is different.
- the first laser diode 200 outputs a first optical signal 210 having a narrow oscillation line width and a polarized pulse
- the second laser diode 300 outputs the first optical signal 210.
- the line width of the first optical signal 210 may be set to 1 nm or less and the second optical signal 310 may be set to 10 nm or more.
- the line widths of the first optical signal 210 and the second optical signal 310 may be set within different numerical ranges according to the characteristics of the wavelength converter 600 described later.
- the optical switch 400 switches the optical signal such that the first optical signal 210 or the second optical signal 310 is input to the optical amplifier 500 according to the input burst trigger signal 110. Specifically, when the burst trigger signal 110 is high, the optical switch 400 selects and transfers the first optical signal 210 to the optical amplifier 500, and the burst trigger signal 110 is low. In the case of (low), the optical switch 400 selects the second optical signal 310 and transmits it to the optical amplifier 500.
- the optical switch 400 selects the second optical signal 310 when the burst trigger signal 110 is high, and when the burst trigger signal 110 is low.
- the first optical signal 210 may be operated in a manner of selecting.
- the first optical signal 210 (solid line) and the second optical signal 310 (dashed line) are switched by the optical switch 400 according to the burst trigger signal 110 and transmitted to the optical amplifier 500. Is illustrated.
- the first optical signal 210 and the second optical signal 310 switched and output by the optical switch 400 are transferred to the optical amplifier 500 and amplified.
- the optical amplifier 500 may be formed by connecting a plurality of amplifiers in multiple stages.
- the optical amplifier 500 may include a fiber amplifier or a laser crystal amplifier. More specifically, it may be used in the form of a single fiber amplifier, a multi-stage fiber amplifier, a single crystal amplifier, a multi-stage crystal amplifier, a multi-stage fiber amplifier and a multi-stage crystal amplifier, but is not limited thereto.
- the optical signal input to the optical amplifier 500 has the same size according to the burst trigger signal 110, but the first optical signal 210 and the second optical signal 310 having different line widths and polarization states are mixed. Since the signal is input, it maintains a uniform pulse-shaped optical signal in time, which can solve problems such as damage to the optical amplifier 500 and instability of the laser system due to the over-amplification.
- the optical amplifier 500 of the present embodiment receives an optical signal in the form of a uniform pulse, there is no energy accumulated in the amplification medium of the optical amplifier 500, thereby preventing damage to the amplification stage and the optical system due to over-amplification, and laser output. Instability can be prevented.
- the optical signal amplified by the optical amplifier 500 is transmitted to the wavelength converter 600.
- the wavelength converter 600 is a wavelength converter 600 using a nonlinear phenomenon.
- the wavelength converter 600 using the nonlinear phenomenon light pulses having a strong peak power and maintaining polarization in a specific state are efficiently converted to wavelengths, but light pulses having a weak peak power are hardly wavelength converted.
- the wavelength conversion efficiency varies greatly depending on the size of the input light source, the size of the line width of the input light source and the polarization state.
- the present invention utilizes the characteristics of the wavelength converter 600 as described above, and adjusts at least one of the line width and the polarization state of the input light source while maintaining the size of the input light source above a threshold value for nonlinear phenomenon induction.
- the burst mode modulation of the wavelength-converted signal is possible.
- the first optical signal 210 is a light signal having a narrow line width and polarized light
- the second optical signal 310 is a light signal having a wide line width and unpolarized light.
- the first optical signal 210 is wavelength-converted and output, but the second optical signal 310 is rarely output due to low wavelength conversion efficiency, and the wavelength converter 600 in FIG.
- the output result of is displayed corresponding to the burst trigger signal 110.
- the first optical signal 210 of the narrow and polarized first laser diode 200 having an oscillation line width and the second optical signal 310 of the second laser diode 300 having a wide oscillation line width and no polarization are present.
- the optical signal input to the optical amplifier 500 receives signals having different line widths and polarization states according to the burst trigger signal 110, which maintains an optical signal having a uniform pulse shape in time, thus preventing the excessive amplification. Problems such as damage to the optical amplifier 500 or instability of the laser system can be solved.
- the wavelength-converted light of strong intensity In the case of the second optical signal 310 which is output as a signal and has a wide oscillation line width and no polarization state, wavelength conversion is not performed due to low nonlinear wavelength conversion efficiency or converted into a signal having a very small size. Can be implemented.
- the burst mode laser generation device 1 of the present invention the burst mode can be easily implemented in the wavelength conversion laser by adjusting the oscillation line width and the polarization state of the oscillation light source. There is an effect that can prevent the instability of the output.
- optical fiber laser system of the all-optical fiber type can be manufactured, there is an effect that can have all the advantages of excellent operating environment, durability, and light weight of the optical fiber laser system.
- burst mode laser generation method according to an embodiment of the present invention will be described below with reference to the accompanying drawings. However, the same description as that described in the burst mode laser generation device 1 according to an embodiment of the present invention will be omitted.
- FIG. 2 is a flowchart of a burst mode laser generation method according to an embodiment of the present invention.
- a burst mode laser generation method includes (a) a first optical signal 210 having a narrow oscillation line width and polarization and a second light having a wide oscillation line width and non-polarization Generating a signal 310 (S100), (b) generating a burst trigger signal 110 (S200), and (c) a first optical signal 210 and a second optical signal 310. Selecting and outputting any one according to the burst trigger signal 110 (S300), (d) amplifying the output optical signal (S400), and (e) non-linear wavelength converting the amplified optical signal (S500).
- step S200 the burst trigger signal 110 is generated in the same form according to the waveform of the desired burst mode (any pulse train modulation).
- step S300 when the burst trigger signal 110 is high, the first optical signal 210 is selected and output. When the burst trigger signal 110 is low, the burst trigger signal 110 is low. The second optical signal 310 is selected and output.
- the optical amplifier 500 Since the first optical signal 210 and the second optical signal 310 are mixed according to the burst trigger signal 110 to output and amplify an optical signal having a uniform pulse shape in time, the optical amplifier 500 according to over-amplification Problems such as damage or instability of the laser system can be solved.
- the first optical signal 210 is wavelength-converted and output as a result of the nonlinear wavelength conversion. Since the optical signal 310 has a low wavelength conversion efficiency and is hardly output, the optical signal 310 may generate a pulsed laser in burst mode corresponding to the burst trigger signal 110.
- the burst mode laser generation method of the present invention it is possible to easily implement the burst mode in the wavelength conversion laser by adjusting the oscillation line width and the polarization state of the oscillation light source. There is an effect that can prevent.
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Abstract
Description
Claims (10)
- 버스트 트리거 신호를 생성하는 트리거 신호 발생기;펄스 형태의 제1 광신호를 발생하는 제1 광원;펄스 형태의 제2 광신호를 발생하는 제2 광원;상기 버스트 트리거 신호에 따라 상기 제1 광신호와 상기 제2 광신호 중 어느 하나를 선택하여 출력하는 광 스위치;상기 광 스위치에서 출력된 광신호를 증폭하는 광 증폭기; 및상기 광 증폭기에서 증폭된 광신호를 파장 변환하는 파장 변환기를 포함하되,상기 제1 광신호와 상기 제2 광신호는 발진 선폭 및 편광 상태 중 적어도 하나가 다른 것을 특징으로 하는 버스트 모드 레이저 생성 장치.
- 제1항에 있어서,상기 제1 광원 및 상기 제2 광원은 레이저 다이오드로 마련되는 것을 특징으로 하는 버스트 모드 레이저 생성 장치.
- 제1항에 있어서,상기 제1 광신호의 발진 선폭은 상기 제2 광신호의 발진 선폭보다 좁은 것을 특징으로 하는 버스트 모드 레이저 생성 장치.
- 제3항에 있어서,상기 제1 광신호의 선폭은 1 nm 이하이고, 상기 제2 광신호의 선폭은 적어도 10 nm인 것을 특징으로 하는 버스트 모드 레이저 생성 장치.
- 제1항 내지 제4항 중 어느 한 항에 있어서,상기 제1 광신호는 소정 방향으로 편광된 상태이고, 상기 제2 광신호는 편광되지 않은 것을 특징으로 하는 버스트 모드 레이저 생성 장치.
- 제1항에 있어서,상기 광 스위치는,상기 버스트 트리거 신호가 하이(high)인 경우에는 상기 제1 광신호를 선택하여 상기 광 증폭기로 전달하고, 상기 버스트 트리거 신호가 로우(low)인 경우에는 상기 제2 광신호를 선택하여 광 증폭기로 전달하는 것을 특징으로 하는 버스트 모드 레이저 생성 장치.
- 제1항에 있어서,상기 파장 변환기는 상기 증폭된 광신호를 비선형 파장 변환하는 것을 특징으로 하는 버스트 모드 레이저 생성 장치.
- (a) 발진 선폭이 좁고 편광된 제1 광신호와, 발진 선폭이 넓고 편광되지 않은 제2 광신호를 발생시키는 단계;(b) 버스트 트리거 신호를 생성하는 단계;(c) 상기 제1 광신호와 상기 제2 광신호 중 어느 하나를 상기 버스트 트리거 신호에 따라 선택하여 출력하는 단계;(d) 출력된 광신호를 증폭하는 단계; 및(e) 증폭된 광신호를 비선형 파장 변환하는 단계를 포함하는 버스트 모드 레이저 생성 방법.
- 제8항에 있어서,상기 (b) 단계에서,상기 버스트 트리거 신호는 원하는 버스트 모드의 파형에 따라 이와 동일한 형태로 생성되는 것을 특징으로 하는 버스트 모드 레이저 생성 방법.
- 제8항에 있어서,상기 (c) 단계에서는,상기 버스트 트리거 신호가 하이(high)인 경우에는 제1 광신호를 선택하여 출력하고, 상기 버스트 트리거 신호가 로우(low)인 경우에는 제2 광신호를 선택하여 출력하는 것을 특징으로 하는 버스트 모드 레이저 생성 방법.
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