SciCombinator

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

Concept: Laser pointer

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

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

7

Spider veins on the lower limbs are very common and have been reported to be present in 41% of women over 50. Sclerotherapy as a traditional treatment for spider veins has a low cost, though it may have adverse sequelae. Lasers have shown fewer but still substantial complications as well. Its lower efficacy relative to sclerotherapy has limited laser application for the treatment of spider veins.

Concepts: Laser, Laser pointer, Varicose veins, Laser applications

6

Topological insulators are phases of matter characterized by topological edge states that propagate in a unidirectional manner that is robust to imperfections and disorder. These attributes make topological insulator systems ideal candidates for enabling applications in quantum computation and spintronics. Here, we propose a fundamentally new concept that exploits topological effects in a unique way: the topological insulator laser. These are lasers whose lasing mode exhibits topologically-protected transport without magnetic fields. The underlying topological properties lead to a highly efficient laser, robust to defects and disorder, with single mode lasing even at very high gain values. The topological insulator laser alters current understanding of the interplay between disorder and lasing, and at the same time opens exciting possibilities in topological physics, such as topologically-protected transport in systems with gain. On the technological side, the topological insulator laser provides a route to make many semiconductor lasers to operate as a single-mode high-power laser, while coupled efficiently into an output port.

Concepts: Quantum mechanics, Condensed matter physics, Laser, Laser pointer, Gallium arsenide, Gaussian beam, Transverse mode, Laser beam profiler

2

A handheld diode laser is implemented for solid sampling in portable ambient mass spectrometry (MS). Specifically, a pseudo-continuous wave battery-powered surgical laser diode is employed for portable laser diode thermal desorption (LDTD) at 940 nm and compared with nanosecond pulsed laser ablation at 2940 nm. Postionization is achieved in both cases using atmospheric pressure photoionization (APPI). The laser ablation atmospheric pressure photoionization (LAAPPI) and LDTD-APPI mass spectra of sage leaves (Salvia officinalis) using a field-deployable quadrupole ion trap MS display many similar ion peaks, as do the mass spectra of membrane grown biofilms of Pseudomonas aeruginosa. These results indicate that LDTD-APPI method should be useful for in-field sampling of plant and microbial communities, for example, by portable ambient MS. The feasibility of many portable MS applications is facilitated by the availability of relatively low cost, portable, battery-powered diode lasers. LDTD could also be coupled with plasma- or electrospray-based ionization for the analysis of a variety of solid samples.

Concepts: Mass spectrometry, Optical fiber, Laser, Pseudomonas aeruginosa, Laser diode, Laser pointer, Infrared, Fiber-optic communication

2

We report the case of a 13-year-old boy who had a bilateral macular injury after playing with a green laser pointer for a duration of 1 minute. Clinical examination revealed a decrease in visual acuity and macular injury in both eyes, and imaging investigations revealed a bilateral macular lesion due to exposure to the laser pointer. At 3 months' follow up, visual function had improved but remained partially impaired. This case emphasizes the importance of cautious and appropriate use of laser pointer devices because of the potential vision-threatening hazards induced by mishandling of these devices.

Concepts: Surgery, Laser, Laser diode, Laser pointer, Visual acuity, Cornea, Laser applications, Lasers

1

Recently, the first diode laser with a wavelength of 755 nm for in-motion hair removal came on the market. The objective of this study was to check its efficacy, safety, and practicality under different options for its use.

Concepts: Laser, Laser diode, Laser pointer, Clinical psychology, Laser hair removal

1

Nonresorbable substances are still injected to enhance soft-tissue volumes and fill subcutaneous defects. Inflammatory reactions (often termed granulomas) to these materials can be functionally and socially disabling. Most therapeutic options used until now are nonspecific antiinflammatory treatments, targeting an ill-defined immune reaction of undefined cause. The minimally invasive intralesional laser treatment can remove the foreign substance and the inflammatory reaction with an 808-nm diode laser.

Concepts: Inflammation, Optical fiber, Laser, Laser diode, Laser pointer, Minimally invasive