Gain Switch of an AlGaInP Red Light Semiconductor Laser Diode

We solve the single mode coupled rate equations by computer,simulate the behavior of a gain switch of an AlGaInP red light semiconductor laser diode,and find the characteristic of FWHM of pulses changing with the amplitude of modulation signal, the bias current, and the modulated frequency. On this basis, we conduct experiments. The experiment results accord with the simulations well.

Measurement of 3db Bandwidth of Laser Diode Chips

An accurate technique for measuring the frequency response of semiconductor laser diode chips is proposed and experimentally demonstrated.The effects of test jig parasites can be completely removed in the measurement by a new calibration method.In theory,the measuring range of the measurement system is only determined by the measuring range of the instruments network analyzer and photo detector.Diodes' bandwidth of 7 5GHz and 10GHz is measured.The results reveal that the method is feasible and comparing with other method,it is more precise and easier to use.

Effects of the Facet Reflectivity of a Laser Diode on Fiber Bragg Grating Semiconductor Lasers

Effects of facet reflectivity of a laser diode on the performance of fiber Bragg grating semiconductor lasers are studied experimentally. Facet reflectivity of less than 10-4 is necessary to obtain stable oscillation wavelength.

Two-Mode Biomedical Sensor Build-up:Characterization of Optical Amplifier

Intracavity absorption spectroscopy is a strikingly sensitive technique that has been integrated with a two-wavelength setup to develop a sensor for human breath.Various factors are considered in such a scenario,out of which Relative Intensity Noise(RIN)has been exploited as an important parameter to characterize and calibrate the said setup.During the performance of an electrical based assessment arrangement which has been developed in the laboratory as an alternative to the expensive Agilent setup,the optical amplifier plays a pivotal role in its development and operation,along with other components and their significance.Therefore,the investigation and technical analysis of the amplifier in the system has been explored in detail.The algorithm developed for the automatic measurements of the system has been effectively deployed in terms of the laser’s performance.With this in perspective,a frequency dependent calibration has been pursued in depth with this scheme which enhances the sensor’s efficiency in terms of its sensitivity.In this way,our investigation helps us in a better understanding and implementation perspective of the proposed system,as the outcomes of our analysis adds to the precision and accuracy of the entire system.

Blue LED as a new treatment to vaginal stenosis due pelvic radiotherapy:Two case reports

BACKGROUND Currently,the advancement cancer treatment technology improves overall survival,however,adverse events are still a challenge for health professional.Genitourinary syndrome of menopause and vaginal stenosis are conditions that impact the quality of life of patients undergoing radiotherapy.We present two such cases in patients with previous cervical and endometrial cancer.These conditions were handled with an innovative method using an energy-based device with blue light emitting diode for concomitant vaginal and vulvar irradiation.Positive impact in clinical findings,cytologic changes,and referred symptoms were documented.CASE SUMMARY One patient diagnosed with vaginal severe vaginal stenosis with previous cervix cancer treatment and other patient diagnosed with mild stenosis with severe dyspareunia and recent endometrium cancer treatment were considered for vulvovaginal treatment with weekly blue led device and closely evaluated with repeated validated questionnaires and cytological samples.CONCLUSION This innovative technique showed an improvement in all areas of the examiner's criteria,the cytological criteria,and most bothered symptoms.

Use of the Scar Acceleration Method/Método de Aceleração Cicatricial—MAC®—in the Treatment of Capsular Contracture: Case Report

Capsular contracture is a frequent complication in the postoperative period of breast implantation. It usually accompanies the appearance of a firm breast that can progress to pain, distortion, and asymmetry of the breasts, requiring surgical revision. The present study is a case report. A 58-year-old woman with a medical diagnosis of capsular contracture of the right breast evidenced by ultrasound. She was referred to the physiotherapy clinic in October 2019 with an initial complaint of pain on palpation, swelling, and stiffness in her right breast. The patient was evaluated and the MACò method was used to treat capsular contracture. For this, 12 sessions of photodynamic therapy were carried out. The treatment included the use of LED by doping: red (300 s), violet (60 s) and blue (120 s), with the use of 1% methylene blue in target areas, three times a week. The patient had the beginning of symptoms’ remission in the fourth visit and total remission in the 12th visit. It was concluded that the use of photodynamic therapy using the MACò method showed improvement in signs and symptoms—the sensation of prosthesis stiffness in the lower and medial region, local temperature, and pain in the right breast. The patient was followed up after treatment and currently, she has no complaints. There was also no need for surgical intervention. In the present case report, the MACò method proved to be effective. Further research is suggested with a cohort of patients with capsular contracture, with randomization and evaluation of a larger number of patients with the referred method.