횡자장하에서 633㎚ He - Ne 레이저의 주파수 안정화

엄태봉(Tae Bong Eom),박진원(Jin Won Park),정명세(Myung Sai Chung),양준묵(Joon Mook Yang) 한국광학회 1993 한국광학회지 Vol.4 No.4

횡자장하에서 Zeeman 분리된 두 편광성분의 맥놀이 주파수와 출력 차를 이용하여 내부 반사경형 633㎚ He-Ne 레이저의 주파수를 각각 안정화시켰다. 맥놀이 주파수를 이용할 경우 주파수안정도(square root Allan variance)와 주파수 온도계수는 7.0×10-¹¹ 과 170㎑/℃였으며, 출력차이를 이용할 경우에는 1.1×10^(-9) 과 1.8㎒/℃였다. 이 결과로부터 두 펀광성분의 맥놀이 주파수를 이용한 안정화 방법이 출력차의 방법보다 10배 이상의 우수한 주파수 안정화 특성을 갖고 있음을 알 수 있었다. The frequency of the 633 nm internal mirror He-Ne laser has been stabilized by using the beat frequency and the intensity difference between two Zeeman split components in a transverse magnetic field. The frequency stability and the frequency temperature coefficient for the beat frequency method was 7.0×10-¹¹ and 170㎑/℃, respectively, and those for the intensity difference was 1.1×10^(-9) and 1.8㎒/℃, respectively.

적외선 영역에서 광대역으로 파장 가변되는 연속 발진 Cr⁴+ : YAG 레이저 개발

추한태(Han Tae Choo),이봉연(Bong Yeon Lee),양준묵(Joon Mook Yang),이동한(Dong Han Lee),임기수(Ki Soo Lim),이치원(Chi Weon Lee) 한국광학회 1999 한국광학회지 Vol.10 No.3

연속 발진 Nd:YAG 레이저를 펌핑 광원으로 하여 보다 조밀하고 견고하며, 안정된 연속 발진 파장 가변 Cr⁴+:YAG 레이저를 개발하여 레이저 출력 특성, 파장 가변성 및 발진 레이저 선폭 등을 조사하였다. 공진기 구조는 공진기 안정 조건을 계산하여 비점수차가 보상된 Z 자형 접힘 공진기를 구성하였다. 공진기 출력 거울의 투과율이 1%일 때, 결정의 온도를 20℃로 유지하며 6 W로 펌핑하였을 경우, 중심 파장이 1.45 ㎛에서 최대 400 mW의 평균 출력을 갖는 매우 안정된 연속 발진 Cr⁴+:YAG 레이저를 얻을 수 있었으며, 출력 기울기 효율은 8%였다. 또한 공진기 내에 복굴절 필터를 삽입하여 1.399 ㎛에서 1.532 ㎛까지의 파장 가변 영역을 얻었고, 1.4903 ㎛에서 최대 340 mW의 평균 출력을 얻을 수 있었으며, 이때의 레이저 발진 선폭은 0.21 ㎚였다. We have investigated the output power performance of a continuous-wave chromium-doped YAG laser (Cr⁴+: YAG laser), pumped by a Nd : YAG laser. With an output coupler of 1% transmission, we obtained as much as 400 mW of the average output power at 1.450 ㎛. The power slope efficiency of 8%, when the gain medium was cooled to 20℃. We tuned the wavelength of the Cr+⁴: YAG laser, at pump power of 6 W, by using birefringent filter. As a result, lasing wavelength was tuned from 1.399 ㎛ to 1.532 ㎛, with the maximum output power of 340 mW at 1.4903 ㎛ and the linewidth was 0.21 ㎚.

先電離 窒素레이저에 의하여 펌프된 色素레이저

양준묵,추한태,이봉연 충남대학교 1991 忠南科學硏究誌 Vol.18 No.2

A preionized nitrogen laser with average output power of 3.0 mW in repetition rate of 30 Hz was constructed to be used as a pump for dye lasers such as rhodamine 6G, rhodamine B, coumarin 120 and coumarin 102. Under the optimum dye concentrations and wavelengths, dye laser average output power of rhodamine 6G, rhodamine B, coumarin 120 and coumarin 102 were obtained to be 1.6 mW, 1.1 mW, 1.1 mW respectively. According as nitrogen laser average output power was increased up to 76% by preionization effect, dye laser average output powers of rhodamine 6G, rhodamine B, coumarin 120 and coumarin 102 were increased up to 23%, 38%, 57% and 71% respectively. The nitrogen laser system used for this research can be utilized in dye lasers covering the entire visible spectra and if the nitrogen laser output power is improved, the output power of the coumarin 102 dye laser can be improved higher than that of the rhodamine 6G dye laser.

질소레이저의 개발에 관한 연구

梁俊默,琴彩,崔哲圭 충남대학교 기초과학연구소 1983 연구논문집 Vol.4 No.-

We have studied a Blumlein nitrogen laser which can be operated with a high stability. This has been obtained from a laser tube powered by a pulse forming network in the form of a parallel plate transmission line with low impedance. The energy storage capacitor and the transmission line are constructed with 0.05㎜ thick Al plates and 0.189㎜ thick Mylar films ; their capacitance is 90 ㎋ identically. The water cooled electrodes with separation of 0.3㎜ are 66㎝ in length and connected to the storage capacitor and the transmission line respectively. The best lasing action of the nitrogen laser is observed at laser tube pressure of 12 Torr, charging voltage of 3050 Volts, the repetition rate 28 ㎐, and the spark gap-separation of 7.4㎜. (with the electrode separation 0.3㎜). In this circumstance, the value of E/p is about 847 Volts·㎝^-1·Torr^-1 which is about eight times as large as the values that have been reported by the previous authors.

TFD 中性原子의 最大電子 密度半徑

梁俊默 순천향대학교 1996 Journal of Soonchunhyang Medical Science Vol.2 No.2

Blumlein 전송회로에 의해 선전리되는 질소레이저의 동작특성 연구

양준묵,추한태,이봉연,이치원 충남대학교 1990 忠南科學硏究誌 Vol.17 No.2

The design and construction of nitrogen laser preionized with a Blumlein transmission line circuit is described. For the power supply, we have used a pulse type high voltage power source that can be produce 10 joule energy in a pulse. The condition of maximum output power is observed at N_2 gas pressure of 100 torr, spark gap distance of 6.0 mm, repetition rate of 30Hz with preionization, and the stability increases by 0.7%. The maximum increment of output power is achieved at pressure of 200 torr when preionization is used. Finally we can increase the output power by approximately 60% by using this work, and the E/P value is 133 V㎝^(-1) torr^(-1).

나선형 이중 평행판 축전기형 Blumlein 전송회로를 사용한 소형 질소레이저의 동작 특성 연구

양준묵,이치원,조돈수,이봉연 충남대학교 기초과학연구소 1995 忠南科學硏究誌 Vol.22 No.1

The design and performance of a compact nitrogen laser which consists of a Spiral multiple parallel plate capacitor type Blumlein transmission line circuit are described. The laser tube is made by 50 ㎜ long with a 2.5 ㎜ main electrode gap spacing. The output power increased with the spark gap distance. The peak power of 3.0 μJ has been obtained with a spark gap distance of 3.5 ㎜ and a repetition rate of 30㎐. The optimum nitrogen gas pressure was about 60torr independent of the variation of spark gap distance. The laser operates with repetition rate of up to 70 ㎐.

中性原子의 TFD 函數値數表와 그의 最大電子 密度半徑의 計算

梁俊默 순천향대학교 1980 논문집 Vol.3 No.1

A new table of Thomas-Fermi-Dirac functions for neutral atoms is calculated transforming the Thomas-Fermi-Dirac functions of Thomas into that of Umeda and using of the new boundary radii. Our calculations of atomic radii by the new table are seen in good agreement with the Hartree-Fock's and give the value of 0.7776 in Bohr unit for hydrogen, which is 1.826 times as large as the Umeda's result for hydrogen.

고속고압 방전간극을 사용한 질소 레이저의 동작 특성

양준묵,이치원,안근옥 충남대학교 자연과학연구소 1987 忠南科學硏究誌 Vol.14 No.2

We have constructed a nitrogen laser which is 42㎝ long has a rapid high-voltage spark gap and a multiple parallel capacitor-type Blumlein transmission line circuit, whose total capacitance is about 80 nF. The maximum output power of laser has obtained under the condition of nitrogen gas pressure of 80torr, spark gap spacing of 2.26mm and charging voltage of 10.5kV. Under these optimum conditions and maintaining constant stability of 0.02, this laser can be operated with a range of repetition rate, from 10 to 30.1 Hz. The value of E/P is 437 V.cm^-1. torr^-1 for maximum output power and 417 Vcm^-1. torr^-1 for optimum stability condition.

방전간극내의 기체 압력변화에 따른 질소레이저의 동작특성

양준묵,이승철,추한태 충남대학교 자연과학연구소 1989 忠南科學硏究誌 Vol.16 No.1

질소레이저의 반복률과 출력 특성에 미치는 요소는 여러 가지가 있는바 방전간극내 기체압력 역시 커다란 영향을 미치고 있다. 본 연구는 이를 위하여 펄스형 전원, 다중 평행판 측전기형 Blumlein 전송회로, 고속고압 방전간극 그리고 길이 66cm의 레이저관으로 구성된 레이저를 제작하였으며 방전간극내에 주입된 질소기체의 압력을 1bar, 1.4bar, 1.8bar, 2.2ba로 변형시켜 가며 동작특성을 측정하였다. MCA와 검출기를 사용하여 측정된 최적동작특성은 방전간극거리 1.12mm에서 방전간극내 질소기체압력이 2.2bar, 레이저관내의 질소기체 압력이 60torr이었고 반복률과 안정도는 각각 90Hz, 2% 이었다. We constructed a nitrogen laser system which was consisted of pulse type high voltage power source, multiple parallel capacitor type Blumlein transmission line circuit, rapid high voltage spark gap, 66cm long laser tube and synchronized trigger system and studied on the operational characteristics of this laser when the pressure of nitrogen gas filled in the spark gap was changed into four steps as 1bar, 1.4bar, 1.8bar, 2.2bar. Using the MCA and silicon detector, the optimum operational characteristics were obtained to be nitrogen gas pressure of 2.2bar in spark gap spacing of 1.12mm, nitrogen gas pressure of 60 Torr in laser tube, repetition rate of 90Hz and stability of 2%.