SciCombinator

Discover the most talked about and latest scientific content & concepts.

Concept: Laser diode

28

To evaluate the antimicrobial effect of a diode laser irradiation, photo-activated disinfection (PAD), conventional and sonic activated irrigation with 2.5% sodium hypochlorite (NaOCl) on Enterococcus faecalis.

Concepts: Hydrogen peroxide, Laser diode, Chlorine, Disinfectant, Hypochlorous acid, Sodium hypochlorite, Enterococcus faecalis, Bleach

28

This randomized split-mouth clinical trial was designed to evaluate the efficacy of scaling and root planing associated to the high-intensity diode laser on periodontal therapy by means of clinical parameters and microbial reduction.

Concepts: Medicine, Clinical trial, Bacteria, Microbiology, Effectiveness, ClinicalTrials.gov, Evaluation methods, Laser diode

28

A pulsed laser ablation based approach is developed on page 6289 by My Ali El Khakani and co-workers for the direct synthesis of nanohybrid structures consisting of single-wall carbon nanotubes (SWCNTs) decorated with PbS quantum dots (PbS-QDs). By varying the laser ablation conditions, the size of the PbS-QDs together with the coverage rate of the nanotubes can be controlled. The latitude of the laser ablation process allows the SWCNTs/PbS-Qds nanohybrids to be easily integrated into photoconductive devices, which exhibit strong and fast photoresponse over a wide spectral range.

Concepts: Laser, Quantum dot, Nanomaterials, Laser diode, Carbon nanotube, Solar cell, Laser ablation, Carbon nanotubes in photovoltaics

27

Photothermal cancer therapy using near-infrared (NIR) laser radiation is an emerging treatment. In the NIR region, two biological transparency windows are located in 650-950 nm (first NIR window) and 1000-1350 nm (second NIR window) with optimal tissue transmission obtained from low scattering and energy absorption, thus providing maximum radiation penetration through tissue and minimizing autofluorescence. To date, intensive effort has resulted in the generation of various methods that can be used to shift the absorbance of nanomaterials to the 650-950 nm NIR regions for studying photoinduced therapy. However, NIR light absorbers smaller than 100 nm in the second NIR region have been scant. We report that a Au nanorod (NR) can be designed with a rod-in-shell (rattle-like) structure smaller than 100 nm that is tailored to be responsive to the first and second NIR windows, in which we can perform hyperthermia-based therapy. In vitro performance clearly displays high efficacy in the NIR photothermal destruction of cancer cells, showing large cell-damaged area beyond the laser-irradiated area. This marked phenomenon has made the rod-in-shell structure a promising hyperthermia agent for the in vivo photothermal ablation of solid tumors when activated using a continuous-wave 808 m (first NIR window) or a 1064 nm (second NIR window) diode laser. We tailored the UV-vis-NIR spectrum of the rod-in-shell structure by changing the gap distance between the Au NR core and the AuAg nanoshell, to evaluate the therapeutic effect of using a 1064 nm diode laser. Regarding the first NIR window with the use of an 808 nm diode laser, rod-in-shell particles exhibit a more effective anticancer efficacy in the laser ablation of solid tumors compared to Au NRs.

Concepts: Cancer, Ultraviolet, Oncology, Laser, In vivo, Therapy, Laser diode, Photothermal Therapy

27

ABSTACT: In the last decade laser vaporization of the prostate has emerged as a safe and effective alternative to transurethral resection of the prostate (TURP). This was facilitated in particular by the introduction of photoselective vaporization of the prostate (PVP) with a 532 nm 80 W KTP laser in 2002. Prospective randomized trials comparing PVP and TURP with a maximum follow-up of 3 years mostly demonstrated comparable functional results. Cohort studies showed a safe application of PVP in patients under oral anticoagulation and with large prostates. Systems from various manufacturers with different maximum power output and wavelengths are now available for diode laser vaporization of the prostate. Prospective randomized trials comparing diode lasers and TURP are not yet available. In cohort studies and comparative studies PVP diode lasers are characterized by excellent hemostatic properties but functional results vary greatly with some studies reporting high reoperation rates.

Concepts: Laser, Urology, Laser diode, Laser pointer, Prostate, Prostatic stent, Laser ablation, Transurethral resection of the prostate

25

In this radiographic and microbiologic split-mouth clinical trial, efficacy of a diode laser as an adjunct to conventional scaling in the nonsurgical treatment of peri-implantitis was investigated.

Concepts: Clinical trial, Randomized controlled trial, Laser, Effectiveness, Laser diode, Laser pointer, Pharmaceutical industry, Clinical research

25

A 10  m/25  Gbps light-based WiFi (LiFi) transmission system based on a two-stage injection-locked 680 nm vertical-cavity surface-emitting laser (VCSEL) transmitter is proposed. A LiFi transmission system with a data rate of 25 Gbps is experimentally demonstrated over a 10 m free-space link. To the best of our knowledge, it is the first time a two-stage injection-locked 680 nm VCSEL transmitter in a 10  m/25  Gbps LiFi transmission system has been employed. Impressive bit error rate performance and a clear eye diagram are achieved in the proposed systems. Such a 10  m/25  Gbps LiFi transmission system provides the advantage of a communication link for higher data rates that could accelerate the deployment of visible laser light communication.

Concepts: Light, Laser, Laser diode, Data transmission, Radio, Lasers and aviation safety, Bit rate, Kilobit

24

To evaluate effectiveness and safety of debulking and diode laser photocoagulation (DPC) for the treatment of limbal melanoma (LM).

Concepts: Laser, Retrospective, Laser diode, Laser pointer, Laser photocoagulation

23

This study aimed to evaluate the effectiveness of a combined set of low level diode laser scanner (665 nm and 808nm) on hair growth, and assessment of safety and effectiveness of a new laser scanner on hair growth treatment procedure in androgenic alopecia.

Concepts: Effect, Laser, Effectiveness, Laser diode, Laser pointer, Alopecia, Baldness, Androgenic alopecia

23

A multichannel imaging system is presented, consisting of 25 microfabricated optically-pumped magnetometers. The sensor probes have a footprint of less than 1 cm2 and a sensitive volume of 1.5 mm × 1.5 mm × 1.5 mm and connect to a control unit through optical fibers of length 5 m. Operating at very low ambient magnetic fields, the sensor array has an average magnetic sensitivity of 24 fT/Hz½, with a standard deviation of 5 fT/Hz½ when the noise of each sensor is averaged between 10 and 50 Hz. Operating in Earth’s magnetic field, the magnetometers have a field sensitivity around 5 pT/Hz½. The vacuum-packaged sensor heads are optically heated and consume on average 76 ± 7 mW of power each. The heating power is provided by an array of eight diode lasers. Magnetic field imaging of small probe coils was obtained with the sensor array and fits to the expected field pattern agree well with the measured data.

Concepts: Magnetic field, Optics, Earth's magnetic field, Magnet, Magnetometer, Optical fiber, Laser diode, Arithmetic mean