KR950004379B1 - Light converting device - Google Patents
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- KR950004379B1 KR950004379B1 KR1019920018790A KR920018790A KR950004379B1 KR 950004379 B1 KR950004379 B1 KR 950004379B1 KR 1019920018790 A KR1019920018790 A KR 1019920018790A KR 920018790 A KR920018790 A KR 920018790A KR 950004379 B1 KR950004379 B1 KR 950004379B1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
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- Optics & Photonics (AREA)
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
Description
제1도는 종래의 기술에 의한 광변환장치의 구성을 나타내는 블럭도.1 is a block diagram showing the configuration of an optical conversion device according to the prior art.
제2도는 본 발명에 따른 광변환장치의 구성을 나타내는 블럭도.2 is a block diagram showing a configuration of an optical conversion device according to the present invention.
제3도는 제2도의 편광소자부에서 빛을 재입사시키는 과정을 도시한 순서도.3 is a flowchart illustrating a process of re-incident light from the polarizer of FIG. 2.
본 발명은 광변환장치에 관한 것으로, 특히 레이저 공진기에서 편광소자의 광진행방향을 조절함으로써 고조파의 발생 효율을 늪이기 위한 광변환장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical conversion device, and more particularly, to an optical conversion device for reducing the generation efficiency of harmonics by adjusting the light traveling direction of a polarizing element in a laser resonator.
제2고조파 발생장치(SHG : Second Harmonic Generator)는 비선형 단결정과 같은 비선형 물질이 전자기파와 작용하여 원래 주파수의 두배에 해당하는 고조파(harmonic wave)를 발생시키는 장치로, 특히 최근들어 개발이 활발한 광기록재생장치 및 광계측기, 고해상도 레이저 프린터 등에 사용된다.Second Harmonic Generator (SHG) is a device in which nonlinear materials such as nonlinear single crystals work with electromagnetic waves to generate harmonic waves corresponding to twice the original frequency. Used in reproducing apparatus, photometer, high resolution laser printer and the like.
제1도는 종래의 기술에 따른 제2고조파 발생장치의 구성을 보여주는 블럭도이다.1 is a block diagram showing the configuration of a second harmonic generator according to the prior art.
제1도를 참조하면, 여기광원(1)으로서 예를들면 레이저다이오드를 사용하여 발생된 빛은 약 810nm의 파장을 갖게 되며, 이 빛은 집광렌즈(2)에서 집광되어 레이저 단결정(3)을 거쳐 약 1064nm의 파장을 갖게 된다. 이 빛은 다시 편광소자로시 예를들면 브레스터판(brewster plate)(4)면에서 지면과 수평한 편광빛은 상기 브레스터판(4)을 통과하고, 지면과 수직한 편광빛은 반사되게 되며 상기 브레스터판(4)을 통과한 빛은 비선형 단결정소자(5)에서의 제2고조파 발생에 기여하게 된다.Referring to FIG. 1, light generated by using a laser diode as an excitation light source 1, for example, has a wavelength of about 810 nm, and the light is condensed by the condensing lens 2 to provide the laser single crystal 3. It has a wavelength of about 1064nm. This light is again polarized element, for example, in the brewster plate (4) plane, the polarized light parallel to the ground passes through the Brester plate (4), the polarized light perpendicular to the ground is reflected The light passing through the Brester plate 4 contributes to the generation of second harmonics in the nonlinear single crystal element 5.
그러나 상기와 같은 제2고조파 발생장치는 여기광원으로부더 발생된 빛 중 지면과 수평한 상기 brewster 판을 통과하여 위상정합조건을 만족하는 빛만이 고조파 발생에 이용되고, 나머지 상기 지면과 수직한 방향의 편광빔은 고조파 발생에 이용하지 못하여 고조파 발생효율이 떨어지는 문제점이 있다.However, in the second harmonic generator as described above, only light that satisfies the phase matching condition through the brewster plate horizontal to the ground among the light generated by the excitation light source is used to generate harmonics, and is perpendicular to the rest of the ground. The polarizing beam cannot be used to generate harmonics, and thus, harmonic generation efficiency is lowered.
따라서 본 발명의 목적은 상기와 같은 문제점을 해결하여 고조파 발생효율을 높일 수 있는 광변환장치를제공하는 것이다.Accordingly, an object of the present invention is to provide an optical conversion device that can solve the above problems and increase the harmonic generation efficiency.
상기 목적을 달성하기 위한 본 발명의 광변환장치는 레이저광을 발생시키기 위한 여기광원, 상기 레이저광을 집광시키기 위한 집광소자, 상기 집광된 레이저광을 편광시키기 위한 편광소자, 상기 편광소자를 거쳐입사된 광으로부더 고조파를 발생시키는 비선형 단결정소자 및 집광소자를 거쳐 입사된 빛을 공진시키기 위해 상기 집광소자와 편광소자의 사이에 위치하는 제1미러와 상기 비선형 단결정소자의 뒤에 위치하는 제2미러로 이루어진 한쌍의 미러를 포함하는 레이저 공진기로 구성된 광변환장치에 었어서, 상기 편광소자의 광진행방향에 수직이며 또한 지면과 수직한 방향의 편광빈을 레이저 공진기에 재입사시켜 고조파를 발생시키기 위한 편광변환장치를 구비하여 이루어지는 것을 특징으로 한다.The optical conversion device of the present invention for achieving the above object is an excitation light source for generating a laser light, a light collecting device for condensing the laser light, a polarizing device for polarizing the focused laser light, incident through the polarizing device The first and second mirrors positioned between the light collecting element and the polarizing element to resonate the light incident through the light collecting element and the second mirror positioned behind the nonlinear single crystal element to generate harmonics from the light. In the optical conversion device composed of a laser resonator comprising a pair of mirrors, the polarization for generating harmonics by re-injecting the polarization bin in the direction perpendicular to the light traveling direction of the polarizer and perpendicular to the ground to the laser resonator It is characterized by comprising a converter.
이하 첨부도면을 참조하여 본 발명을 좀 더 상세하게 설명하고자 한다. 제2도는 본 발명에 따른 광변환장치의 구성을 나타내는 블럭도이다.Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. 2 is a block diagram showing the configuration of an optical conversion device according to the present invention.
제2도를 참조하면, 본 발명의 광변환장치는 여기광원(1)과 집광렌즈(2)와 제1미러를 포함하는 레이저단결정부(3), 편광소자(4), 비선형 단결정(5) 및 제2미러(6) 및 편광변환장치(11)로구성되며 상기 편광변환장치(11)는 제1 및 제2위상변조소자(7,9)와 제3 및 제4미러(8,10)로 구성된다. 이때 상기 레이저 단결정부(3)는 레이저 단결정의 바깥면에 고반사율층이 코팅되어 있거나 또는 별도의 미러로 구성된다.Referring to FIG. 2, the optical conversion device of the present invention includes a laser single crystal portion 3 including an excitation light source 1, a condenser lens 2, and a first mirror, a polarizing element 4, and a nonlinear single crystal 5; And a second mirror 6 and a polarization converting device 11, wherein the polarization converting device 11 includes first and second phase modulators 7 and 9 and third and fourth mirrors 8 and 10. It consists of. At this time, the laser single crystal part 3 is coated with a high reflectivity layer on the outer surface of the laser single crystal or is composed of a separate mirror.
상기와 같이 구성된 광변환장치의 동작원리는 다음과 같다The operation principle of the optical conversion device configured as described above is as follows.
여기광원(1)으로서 예를들면 레이저 다이오드를 사용하여 발생된 약 810nm의 파장을 갖는 빛은 집광렌즈(2)에서 집광되어 레이저 단결정(3)을 거쳐 약 1064nm의 파장을 갖게 된다. 이 빛은 다시 편광소자로서 예를들면 브레스터판(brewster plate)(4)면에서 지면과 수평한 편광빛은 상기 브레스터판(4)을 통과하고, 지면과 수직한 편광빛은 반사되게 되며, 상기 브레스터판(4)을 통과한 빛은 비선형 단결정소자(5)로 입사되어 위상정합을 만족하는 빛은 제2고조파 발생에 기여하게 되고 나머지는 상기 비선형 단결정소자(5)를 통과하여 상기 제1미러(3)와 제2미러(6)가 이루는 레이저 공진기 내부에 구속됨으로써 지속적으로 고조파 발생에 기여하게 된다.Light having a wavelength of about 810 nm generated using, for example, a laser diode as the excitation light source 1 is collected by the condenser lens 2 and has a wavelength of about 1064 nm via the laser single crystal 3. This light is again used as a polarizing element, for example, on the brewster plate 4 plane, the polarized light that is horizontal to the ground passes through the Brester plate 4, and the polarized light perpendicular to the ground is reflected. The light passing through the Brester plate 4 is incident to the nonlinear single crystal element 5, and the light satisfying phase matching contributes to the generation of second harmonics, and the rest passes through the nonlinear single crystal element 5. Since the first mirror 3 and the second mirror 6 are restrained in the laser resonator, they contribute to the generation of harmonics.
또한 상기 브레스터판(4)에서 지면과 수직한 방향으로 반사된 빛은 제1위상변조소자(7)로서 예를들면 λ/4의 파장특성을 갖는 파장판을 거쳐 제3미러(8)에서 반사되고 다시 제1위상변조소자(7)를 거침으로써 상기 제1위상변조소자(7)를 2회 통과하여 위상변화로 편광방향이 90。회전된다.In addition, the light reflected in the direction perpendicular to the ground in the Brester plate 4 is the first phase modulation device 7, for example, in the third mirror 8 via a wave plate having a wavelength characteristic of λ / 4. By reflecting and passing through the first phase modulator 7 again, the polarization direction is rotated by 90 degrees due to the phase change through the first phase modulator 7 twice.
이 빛은 다시 브레스터판(4)을 거치면서 제2위상변조소자(9)로서 예를들면 제1위상변조소자(7)와 같은λ/4의 파장특성을 갖는 파장판에 입사된 후 제4미러(10)에서 반사되어 재차 제2위상변조소자(9)를 통과하여 편광방향이 90°회전되어 브레스터판(4)을 거치면서 레이저 공진기에 입사됨으로써 고조파 발생에 기여하게 된다.This light passes through the Brester plate 4 again and is incident on the wavelength plate having the same wavelength characteristic as lambda / 4 as the second phase modulation element 9, for example, the first phase modulation element 7. Reflected by the four mirrors 10 again passes through the second phase modulator 9, the polarization direction is rotated by 90 ° to enter the laser resonator while passing through the Brester plate 4 contributes to the generation of harmonics.
제 3도는 제 2도의 편광소자부에서 빛을 재입사시키는 과정을 도시한 순서도이다.3 is a flowchart illustrating a process of re-incident light from the polarizer of FIG. 2.
편광소자(4)에 빛이 입사되면(①) 편광소자(4)를 통과한 빛을 제외한 나머지 지면과 수직한 방향으로 반사된 빛은 제1위상변조소자(7)를 거쳐(②) 제3미러(8)로 입사되고(③) 다시 제3미러(8)에서 반사되어 제1위상변조소자(7)로 입사되며(④) 제1위상변조소자(7)를 통과하여 재차 상기 편광소자(4)로 입사되게 된다 (⑤).When light is incident on the polarizing element 4 (①), the light reflected in the direction perpendicular to the ground except for the light passing through the polarizing element 4 passes through the first phase modulator 7 (②) and the third Incident to the mirror 8 (③) and reflected from the third mirror 8 again and incident to the first phase modulator 7 (④), passing through the first phase modulator 7 and again the polarization element ( 4) (⑤).
상기 편광소자(4)를 통과한 빛은 제2위상변조소자(9)를 거쳐(⑥) 제4미러로 입사되고(⑦) 다시 제4미러(10)에서 반사되어 제2위상변조소자(9)로 입사되며(⑧) 제2위상변조소자(9)를 통과하여 재차 편광소자(4)로 입사되어(⑨) 편광방향이 90。회전되게 된다 (⑩).The light passing through the polarizing element 4 is incident to the fourth mirror (⑦) through the second phase modulator (9) (⑥) and reflected from the fourth mirror 10 again to the second phase modulator (9). (8) is passed through the second phase modulator (9) and is incident again to the polarizer (4) (9) so that the polarization direction is rotated by 90 degrees (⑩).
따라서 본 발명의 광변환장치는 간단한 편광변환장치를 부가함으로써, 고조파의 발생효율을 향상시켜 광변환장치의 고출력화와 고효율화에 따른 장치의 소형화를 가능하게 한다.Therefore, the optical conversion device of the present invention improves the generation efficiency of harmonics by adding a simple polarization conversion device, thereby making it possible to miniaturize the device according to the high output and high efficiency of the optical conversion device.
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| KR1019920018790A KR950004379B1 (en) | 1992-10-13 | 1992-10-13 | Light converting device |
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| KR1019920018790A KR950004379B1 (en) | 1992-10-13 | 1992-10-13 | Light converting device |
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| KR950004379B1 true KR950004379B1 (en) | 1995-04-28 |
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