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"Nyeri dan kualitas hidup terkait kesehatan setelah intervensi bedah jaringan lunak mulut: keuntungan penggunaan laser Nd:YAG. Teknologi laser neodymium-doped yttrium aluminum garnet (Nd:YAG) telah banyak digunakan untuk bedah jaringan lunak mulut. Penelitian terdahulu memperlihatkan bahwa bedah laser menurunkan angka morbiditas dan komplikasi. Tujuan: Penelitian ini bertujuan membandingkan penggunaan laser Nd:YAG dan pisau bedah untuk tatalaksana bedah lesi jaringan lunak mulut. Metode: Studi ini memeriksa 118 lesi yang dilakukan bedah. Grup 1 (G1) terdiri dari 77 kasus yang ditatalaksana dengan laser Nd:YAG; Grup 2 (G2) terdiri dari 41 kasus yang ditatalaksana bedah dengan pisau bedah. Nyeri akut paska operasi dievaluasi dengan visual analogue scale (VAS), numeric rating scale (NRS) dan verbal rating scale-6 (VRS-6) pada hari operasi dan 1, 3 dan 7 hari setelah operasi. HRQoL dievaluasi pada hari ke-10 menggunakan kuesioner dengan skor 0-45. Data dianalisis dengan STATA 12 (StataCorp LP, College Station, Texas, USA). Hasil: Tidak ada perbedaan bermakna antara skor VAS dan NRS pada kedua grup. Namun, terdapar perbedaan bermakna pada skor nyeri dengan VRS-6 di hari ke-1 (47,14% vs 13,16%) dan hari ke-3 (62,86% vs 21,05%) kedua grup. Penelitian ini memperlihatkan bahwa HRQoL pada G1 lebih baik daripada G2. Simpulan: HRQoL yang lebih baik dan nyeri paska operasi yang lebih rendah terlihat pada pasien yang dilakukan bedah laser Nd:YAG. Hasil ini kemungkinan berkaitan dengan efek bio-modulasi dari laser.

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The new technology such as the neodymium-doped yttrium aluminum garnet (Nd:YAG) laser has been used for oral soft tissue surgery. Previous study shown that laser surgery resulted in lower morbidity and complication rates. Objective: This study aims to evaluate the differences in the post-operative course associated to the use of Nd:YAG laser and to cold blade after oral soft tissue surgery. Methods: One-hundred and eighteen comparable surgical interventions were evaluated. Group 1 (G1) included 77 interventions performed with Nd:YAG laser; group 2 (G2) 41 with cold blade. Acute post-operative pain was evaluated with visual analogue scale (VAS), numeric ratingscale (NRS) and verbal rating scale-6 (VRS-6) on the same day of surgery, and at 1, 3 and 7 days after surgery.The HRQoL was evaluated on day 7 using a 0-45 score range questionnaire. Data were analyzed using the software STATA 12 (StataCorp LP, College Station, Texas, USA). Results: No statistically significant differences could be highlighted in VAS and NRS scores. The VRS-6 scores resulted statistically significant at days 1 and 3. At day 1, 47.14% of patients in G1 and 13.16% in G2 had no pain; at day 3, 62.86% in G1 and 21.05% in G2 had no pain. The HRQoL in G1 was statistically higher than G2. Conclusion: The better HRQoL and the lower post-operative pain observed in laser-treated patients may be associated to the possible bio-modulating effect of the laser."

"ABSTRAKA compact, simple and low-cost transversely excited atmospheric (TEA) pressure ultraviolet nitrogen laser {337 nm) has been designed and constructed employing the conventional Blumlein circuit. The measured energy of the output pulse of 337 nm is around 80 -J at 25 kV of charging voltage and l atm operating gas pressure. The beam divergence is found to be 7.7 mrad horizontally and 1.5 mrad vertically. The energy output decreases slightly with increasing gas pressure and gas flow rate, while the beam divergence is relatively stable with respect to the same operating parameters."

"ABSTRACTObservation of fluorescence decay signal of condensed-state molecular samples in the time domain has proved very useful for its identification and analysis. In order to overcome the noise problem in the generally weak fluorescence signals a double-gated boxcar integrator has been designed and incorporated into a spectrometer. The design concept and the working principle of this spectrometer is presented along with detailed description of its subsystems. Performance of this spectrometer has been tested with well-known sample (rhodamine 6G) and the results are duely analyzed. Application of this spectrometer to the measurement of fluorescence spectrum and mean life time of an E. Cali bacteria sample is also described in this work."

"ABSTRACTThe principles of frequency stabilization is to keep constant the optical path length in laser cavity by controlling the laser- tube length. In this system used temperature servo control to control the laser tube length.As reference to an error derived by a sensitive frequency discriminator. Basically the operation of this sensitive frequency discrimantor utilized the longitudinal Zeeman Laser, which splits atomic gain profile.When a longitudinal magnetic field is applied to an internal mirror of single mode He-Ne Laser, the active medium acquires a negative circular dichroism. There fore the intensity of the left cicular polarization (LCP) output of the, laser will be different from the intensity of the right circular polarization (RCP) output and only when the two are simmetrically disposed about the center line will their intensities be equal. This intensity difference as feedback can be detected by passing the output beam throught Wallaston prism and the two orthogonally polarized beams are received by two identical photodiodes. The difference between the output of photodiode as amplified and the resulting signal is passed throught a system controller (PID) before it is fed back as heating or cooling current of peltier elements. This current controls the resonator length thermally and lock the laser frequencies of the two polarized beam symmetrically on either side of the profile."