• 대한물리치료과학회지
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• 제8권2호
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• pp.1033-1038
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• 2001

본 실험은 당뇨로 인한 말초신경병증에 저에너지 레이저의 효과를 알아보기 위해 것으로 흰쥐에 streptozotocin으로 당뇨를 일으켜 당뇨로 인한 말초신경병증을 유발시킨 후 He-Ne IR 레이저를 3주 동안 매일 5분간 조사하여 혈액화학 성분의 변화를 조사한 바 다음과 같은 결론을 얻었다. ALT의 활성치는 당뇨군에 비해 레이저군에서 증가하였으나 유의성은 없었다. AST의 활성치는 대조군과 당뇨군에 비해 레이저군에서 유의하게 증가되었다. LDH는 대조군에 비해 당뇨군과 레이저군에서 유의하게 감소되었다. ALP는 대조군에 비해 당뇨군과 레이저군에서 유의하게 증가되었다. CHOL은 당뇨군에 비해 레이저군에서 유의하게 감소되었다. TRlG는 당뇨군에 비해 레이저군에서 유의하게 증가되었다. CPK는 대조군과 당뇨군에 비해 레이저군에서 유의하게 증가되었다.

• The Journal of Korean Physical Therapy
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• 제12권3호
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• pp.287-292
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• 2000

This studies were to investigate the effects of low power wavelengths Helium-Neon Infra-Red(He-Ne 1R) laser on the changes of the serum immunoblobulin(Ig) concentrations in bum rats, The thirty Spraque-Dawley adult male rats were assigned to the 5 groups: the experimental groups(3). the bum control group(1) and the control group(1). There was made three degree burn by the 290 mW IR on the back oreach rats, from 3 days after being burned. the experimental laser groups were irradiated low power wavelengths(292Hz- 1168Hz, 4672Hz) He-Ne IR laser far 5 minutes every day during the 7days. The results were as follows; 1. The concentrations of immunoglobulin G(Ig G) in serum of all experimental groups on the treated with the low power wavelengths of the He-Ne IR laser during the 5 minutes far 7 days were significantly lower than those of bum groups, but those 1168 Hz group were significantly higher than those of the 292 Hz and 4672 Hz groups. 2. There were significantly decreased the change of the level of immunoglobulin M(Ig M) in serum of all experimental groups on the treated with 5 minutes laser fer 7 days to the burn control group. and were significantly increased on treated with more higher wavelengths groups to those of lower groups. 3. The concentrations immunoglobulin E(Ig E) in serum of the 292Hz wavelengths groups were significantly lower than those in bum control group. As above results. the changes of the immunoglobulin in serum levels on the healing process have meaningful effected with the low power wavelengths role on the treated with He-Ne IR laser.

• 대한기계학회논문집A
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• 제36권1호
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• pp.37-42
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• 2012

LIFT(Laser-Induced-Forward-Transfer) 공정은 선택적으로 마이크로 크기의 물질을 이동시키는데 사용할 수 있는 레이저 공정이다. 본 연구에서 이 공정은 전자부품의 마이크로 시스템 패키징을 위한 솔더볼의 적층을 위해 적용되었다. 레이저 펄스에 의해 국부적으로 녹은 솔더 페이스트는 단단한 기저부분에 이동적층되었다. 솔더 크림층을 지닌 박판유리플레이트가 도우너 필름으로 사용되었고 1070nm 파장의 IR 레이저 펄스를 조사하여 리셉터에 마이크로 솔더를 이동적층하였다. 물질 및 에너지 평형 방정식 등이 솔더 페이스 드롭의 모양과 온도 분포를 분석하기 위해 적용되었다. 실제 실험에서 얻어진 이동적층된 솔더 범프는 30~40 ${\mu}m$ 의 직경과 50 ${\mu}m$ 의 두께를 가진 것으로 측정되었다. 본 공정의 한계 및 적용에 대해서도 논의한다.

• Journal of the Optical Society of Korea
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• 제16권4호
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• pp.331-335
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• 2012

A miniaturized laser beam transmitter, in which a visible laser module at ${\lambda}$=650 nm is precisely stacked upon an infrared (IR) module at ${\lambda}$=905 nm, has been proposed and constructed to provide an IR collimated beam in conjunction with a collinear monitoring visible beam. In particular, the IR beam is selectively dispersed through a perforated sheet diffuser, so as to create a rapidly diverging close-range beam in addition to a highly defined long-range beam simultaneously. The complementary close-range beam plays a role in mitigating the blind region in the vicinity of the transmitter, which is inevitably missed by the main long-range beam, thereby uniformly extending the transmitter's effective trajectory that is sensed by a receiver. The proposed transmitter was designed through numerical simulations and then fabricated by incorporating a diffuser sheet, perforated with an aperture of 2 mm. For the manufactured transmitter, the IR long-range beam was observed to have divergences of ~2.3 and 1.6 mrad in the fast and slow axes, respectively, while the short-range beam yielded a divergence of ~24 mrad. The angular alignment between the long-range IR and visible beams was as accurate as ~0.5 mrad. According to an outdoor feasibility test involving a receiver, the combination of the IR long- and short-range beams was proven to achieve a nearly uniform trajectory over a distance ranging up to ~600 m, with an average detectable cross-section of ${\sim}60{\times}80cm^2$.

• 한국정밀공학회지
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• 제24권11호
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• pp.76-83
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• 2007

The dark-field laser scattering system has been developed to inspect surface defects in infrared cut-off filters and then laser scattering characteristics against the defects are investigated. The qualitative analysis for the reliable and accurate detection performance is described through the correlation between incident angles of a laser and viewing ones of a camera. In this paper, reliable and important information with laser scattering is given for the surface defect inspection of IR filters. Its performance has been verified through various experiments.

• Journal of Welding and Joining
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• 제23권5호
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• pp.55-60
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• 2005

A precise bonding technique, transmission laser bonding using energy transfer, for polymer micro devices is presented. The irradiated IR laser beam passes through the transparent part and absorbed on the opaque part. The absorbed energy is converted into heat and bonding takes place. In order to optimize the bonding quality, the temperature profile on the interface must be obtained. Using optical measurements of the both plates, the absorbed energy can be calculated. At the wavelength of 1100nm $87.5\%$ of incident laser energy was used for bonding process from the calculation. A heat transfer model was applied for obtaining the transient temperature profile. It was found that with the power of 29.5 mW, the interface begins to melt and bond each other in 3 sec and it is in a good agreement with experiment results. The transmission IR laser bonding has a potential in the local precise bonding in MEMS or Lab-on-a-chip applications.

• The Korean Journal of Pain
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• 제5권1호
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• pp.44-51
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• 1992

신경손상에 마치는 저출력 적외선 레이저의 효과를 백서의 좌골신경을 이용하여 조직학적으로 살펴 본 결과를 아래와 같이 요약한다. 1) 동일개체에서 레이저 치료군과 비치료군 사이에 뚜렷한 조직학적 차이는 발견할 수 없었다. 2) 레이저 치료군에서는 조직의 구조(tissue organization)가 비교적 잘 보존되어 있었으며, 혈관의 증식은 비치료군에 비해 풍부하였다. 3) 레이저 치료군과 비치료군의 좌골신경 지배 근육조직 소견에서 뚜렷한 차이는 발견할 수 없었으며, 양군 모두에서 부분적인 근육위축 현상을 관찰할 수 있었다. 4) 레이저 치료군에서는 비치료군에 비해 신경외막(epineurium)의 비후가 뚜렷하였다.

• 설비공학논문집
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• 제10권6호
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• pp.795-802
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• 1998

For measuring the thermal diffusivity by laser flash method, raw data have to be calibrated using temperature data. We have developed in-process calibration method and polynomial calibration in which thermal diffusivity can be calibrated during measuring, This method is different from existing temperature pre-process calibration method and exponential calibration having various source of error. Using this new calibration method, measurement accuracy was improved about 1∼2% compare to the value by the existing method. We also studied more accurate fitting curve as in Figure 4 was shown the result of measuring output characteristics of IR radiometer with temperature. As illustrated in data, in-process calibration method and polynomial calibration equation is proper than pre-process calibration method and exponential calibration.

• Current Optics and Photonics
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• 제3권1호
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• pp.1-7
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• 2019

Optical stimulation provides a promising alternative to electrical stimulation to selectively modulate tissue. However, developing noninvasive techniques to directly stimulate excitable tissue without introducing genetic modifications and minimizing cellular stress remains an ongoing challenge. Infrared (IR) light has been used to achieve optical pacing for electrophysiological studies in embryonic quail and mammalian hearts. Here, we demonstrate optical stimulation and pacing of the embryonic chicken heart using a pulsed infrared thulium laser with a wavelength of 1927 nm. By recording stereomicroscope outputs and quantifying heart rates and movements through video processing, we found that heart rate increases instantly following irradiation with a large spot size and high radiant exposure. Targeting the atrium using a smaller spot size and lower radiant exposure achieved pacing, as the heart rate synchronized with the laser to 2 Hz. This study demonstrates the viability of using the 1927 nm thulium laser for cardiac stimulation and optical pacing, expanding the optical parameters and IR lasers that can be used to modulate cardiac dynamics.

• 한국광학회:학술대회논문집
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• 한국광학회 2005년도 제16회 정기총회 및 동계학술발표회
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• pp.144-145
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• 2005