An optical efficiency of 0.052 under normal mode operation for diode-pumped Ho:Tm:YLiF(4) at a pulse repetition frequency of 10 Hz has been achieved. Laser output energy of 30 mJ in single Q-switched pulses with 600-ns pulse length were obtained for an input energy of 3 J. A diffusion-bonded birefringent laser rod consisting of Ho:Tm-doped and undoped pieces of YLF was utilized for 10-Hz operat...

Continous Wave Operation and Mode-Locking of Ti:Sapph Lasers Michael Meehan Department of Physics and Astronomy, BYU Bachelor of Science Titanium-sapphire lasers are useful in condensed matter research because of their ability to be mode-locked, generating ultrafast, regular pulses of coherent radiation. When designing Ti:sapph lasers, their stability in continous wave (CW) operation is often o...

Ten-layer InAs/In0.15Ga0.85As quantum dot (QD) laser structures have been grown using molecular beam epitaxy (MBE) on GaAs (001) substrate. Using the pulsed anodic oxidation technique, narrow (2 lm) ridge waveguide (RWG) InAs QD lasers have been fabricated. Under continuous wave operation, the InAs QD laser (2 · 2,000 lm) delivered total output power of up to 272.6 mW at 10 C at 1.3 lm. Under p...

A distributed feedback channel waveguide laser in erbium-doped aluminum oxide on a silicon substrate is reported. The optically pumped laser has a threshold pump power of 15 mW and emits 3 mW in single-frequency operation at 1545.2 nm wavelength with a slope efficiency of 6.2% and linewidth of 15 kHz. Keywords—Distributed feedback (DFB) laser; waveguide laser; erbium-doped laser; Bragg gratings...

The announcement of laparoscopic laser cholecystectomy in 1989 sparked a widespread interest in lasers and laser technology. Early proponents of laparoscopic cholecystectomy described it as an operation to be performed with a laser, and available literature suggested that laser energy was necessary to accomplish laparoscopic gallbladder removal. Indeed, in those early days, it seemed that attem...

BACKGROUND The use of intravenous regional anesthesia (IVRA) is limited by pain resulting from the application of tourniquets and postoperative pain. OBJECTIVE To assess the efficacy of low-level laser therapy added to IVRA for improving pain related to surgical fixation of distal radius fractures. METHODS The present double-blinded, placebo-controlled, randomized clinical trial involved 48...

We demonstrate chirped-pulse operation of a Cr : YAG passively mode-locked laser. Different operation regimes of the laser are extensively investigated in the vicinity of zero dispersion both experimentally and numerically. It is shown that for a given laser configuration, transition to the positive dispersion regime allows a 5-fold increase in the output pulse energy, which is otherwise limite...

In this paper, after a brief overview on laser warning system (LWS), a new structure for an optical array that is used in its optical subsystem is introduced. According to the laser threats’ wavelengths (0.5 – 1.6 µm) and our desirable field of view (FOV), we used 6 lenses for gathering the incident radiation and then optimized the optical array. Lenses’ radius, their se...