The operational characteristics of a novel continuous-wave compact intracavity singly-resonant optical parametric oscillator pumped by a vertical external cavity surfaceemitting laser are numerically analyzed. Keywords—nonlinear frequency conversion; semiconductor laser; intracavity optical parametric oscillator Continuous-wave optical parametric oscillators (OPOs) take up a distinguished niche...

This paper reviews optical fiber amplifiers such as Erbium doped fiber amplifiers EDFAs, many types of Raman amplifiers RAs, Thulium doped fiber amplifiers, Tellurite-based fiber Raman amplifiers, semiconductor optical amplifiers and fiber optic parametric amplifiers, principle of operation and construction. As these amplifiers are used for optical fiber communication projects so we shall go th...

We present an 8 × 8 wavelength-routing switch (WRS) that monolithically integrates tunable wavelength converters (TWCs) and an 8 × 8 arrayed-waveguide grating. The TWC consists of a double-ringresonator tunable laser (DRR TL) allowing rapid and stable switching and a semiconductor-optical-amplifier-based optical gate. Two different types of dry-etched mirrors form the laser cavity of the DRR TL...

A theoretical study of a high repetition rate laser source based on a novel mode locking technique is presented. This technique relies on the fast saturation and recovery of a semiconductor optical amplifier induced by an external optical pulse and has been used to obtain 4.3 ps pulses at 20 GHz. A numerical model of the fiber ring laser has been developed describing the mode locking process in...

An experimental and theoretical study of a high repetition rate laser source operating on a novel mode-locking technique is presented. This technique relies on the fast saturation and recovery of a semiconductor optical amplifier induced by an external optical pulse and has been used to obtain 4.3 ps pulses at 20 GHz. A complete mathematical model of the fiber ring laser is presented describing...

We present our perspectives on using laser ultrasound, coupled with optical detection, to characterise the properties of plate like structures. The laser source launches a wideband signal in spatial and temporal domains exciting a Lamb wave spectrum over several octaves. Optical detection picks out the modal dispersion curves and inverting these mathematically presents values for thickness, den...

We report on high-power operation of an optically pumped external-cavity semiconductor disk laser. 13.2W optical output power at 970 nm has been achieved in a double-pass pump configuration. The laser Bragg mirror was designed to provide not only high reflectivity for the laser wavelenth but also for the pumping beam. A proper layer structure which supports standing-wave patterns with a node ne...

At the Nederlands Centrum voor Laser Research (NCLR) a 1 kHz diode-pumped Nd:YAG Master Oscillator Power Amplifier (MOPA) chain with a Stimulated Brillouin Scattering (SBS) Phase Conjugate mirror is designed and operated. A small Brewster angle Nd:YAG slab (2 by 2 by 20 mm) is side pumped with 200 ,us diode pulses in a stable oscillator. The oscillator is Q-switched and injection seeded with a ...

PURPOSE It has been reported that low-level semiconductor diode lasers could enhance the wound healing process. The periodontal ligament is crucial for maintaining the tooth and surrounding tissues in periodontal wound healing. While low-level semiconductor diode lasers have been used in low-level laser therapy, there have been few reports on their effects on periodontal ligament fibroblasts (P...