A 480 mW green tunable diode laser system is demonstrated for the first time to our knowledge. The laser system is based on a GaN broad-area diode laser and Littrow external-cavity feedback. The green laser system is operated in two modes by switching the polarization direction of the laser beam incident on the grating. When the laser beam is p-polarized, an output power of 50 mW with a tunable range of 9.2 nm is achieved. When the laser beam is s-polarized, an output power of 480 mW with a tunable range of 2.1 nm is obtained. This constitutes the highest output power from a tunable green diode laser system.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1364/OL.41.004154 | DOI Listing |
Biotechnol J
December 2024
Institute of Technical Chemistry, Leibniz University Hannover, Hannover, Germany.
The use of optogenetic tools offers an excellent method for spatially and temporally regulated gene and protein expression in cell therapeutic approaches. This could be useful as a concomitant therapeutic measure, especially in small body compartments such as the inner ear, for example, during cochlea implantation, to enhance neuronal cell survival and function. Here, we used the blue light activatable CRY2/CIB system to induce transcription of brain-derived neurotrophic factor (BDNF) in human cells.
View Article and Find Full Text PDFPLoS One
December 2024
Department of Anesthesia, McMaster University, Hamilton, Ontario, Canada.
Background: Caesarean section (CS) is the most common inpatient surgical procedure performed in Canada. CS is known to cause moderate-to-severe pain, which is suggested to be associated with postpartum depression and persistent pain. Existing limitations in multimodal analgesia and conscious attempts to avoid opioids highlight the need for non-pharmacological strategies.
View Article and Find Full Text PDFPhotobiomodul Photomed Laser Surg
December 2024
Department of Plastic Surgery, Hadassah-Hebrew University Medical Center-Ein Kerem, Jerusalem, Israel.
Photobiomodulation (PBM) is a technology that has gained much attention in recent years regarding its potential application for stimulating wound healing, alleviating pain, reducing inflammation, and aiding in the restoration of function. Due to a scarcity of evidence in the literature regarding PBM for the treatment of burns, our objective of this study was to test whether treatment with PBM in hospitalized patients with second-degree burns accelerated recovery. A double-blind controlled study was conducted on nine patients with up to 15% second-degree burns who were hospitalized at Hadassah-Hebrew University Medical Center, Ein Kerem Campus, Jerusalem Israel, between July 2022 and November 2022.
View Article and Find Full Text PDFLaser Photon Rev
October 2024
Harvard Medical School, Boston, MA 02114, USA; Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA; Department of Cardiology, Erasmus Medical Center, Rotterdam GD3015, The Netherlands; Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA 02142, USA.
Photoacoustic microscopy (PAM) is a high-resolution and non-invasive imaging modality that provides optical absorption contrast. By employing dual- or multiple-wavelength excitation, PAM extends its capabilities to offer valuable spectroscopic information. To achieve efficient multispectral PAM imaging, an essential requirement is a light source characterized by a high repetition rate and switching rate, a ≈microjoule pulse energy, and a ≈nanosecond pulse duration.
View Article and Find Full Text PDFHolographically designed aperiodic lattices (ALs) have proven to be an exciting engineering technique for achieving electrically switchable single- or multi-frequency emissions in terahertz (THz) semiconductor lasers. Here, we employ the nonlinear transfer matrix modeling method to investigate multi-wavelength nonlinear (sum- or difference-) frequency generation within an integrated THz (idler) laser cavity that also supports optical (pump and signal) waves. The laser cavity includes an aperiodic lattice, which engineers the idler photon lifetimes and effective refractive indices.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!