A novel active region design is proposed to achieve long-wavelength ( = 1550-nm) diode lasers based on a type-II quantum-well (QW) design of (In)GaAsN–GaAsSb grown on a GaAs substrate. The strain-compensated structures hold potential as an ideal active region for 1500-nm GaAs-based vertical cavity surface emitting lasers. A design analysis and optimization of 1550-nm emitting structures is pres...

We demonstrate highly efficient diode-pumped single-frequency fiber laser with 35% slope efficiency and 50mW output power operating near 2μm, which generated from a 2-cm long piece of highly Tm-doped germanate glass fiber pumped at 800nm. ©2007 Optical Society of America OCIS code: (060.2320) Fiber optics amplifiers and oscillators; (140.3570) Lasers, single-mode; (140.5680) Rare earth and tran...

The development of laser diodes that deliver more than 10 W of output has changed the picture of the laser market. High-power devices now offer many advantages over conventional lasers of similar power levels, such as carbon dioxide or lamp-pumped Nd:YAG lasers. Their high efficiency (>30% wall-plug efficiency) promotes compact size as well as simplicity in power supply and cooling, which make ...

A Michelson wavemeter was developed to test the accuracy and give traceability to the wavelength of external cavity diode lasers. These lasers were stabilized using a Littrow configuration and an iodine gas cell as frequency reference, and they were used as light sources in the assembly of a new interferometric system for the gauge block calibration. Previously, a microcontroller counting devic...

We have measured the spectral linewidths of three continuous-wave quantum cascade lasers operating at terahertz frequencies by heterodyning the free-running quantum cascade laser with two far-infrared gas lasers. Beat notes are detected with a GaAs diode mixer and a microwave spectrum analyzer, permitting very precise frequency measurements and giving instantaneous linewidths of less than -30 k...

We describe the laser performance and thermal properties of side-pumped Nd:YAG rod lasers that use ibercoupled diode lasers as pump sources. Utilizing a nearly homogeneous pump light profile, we realize an output power of more than 60 W in TEM(00) mode operation with optical-to-optical efficiencies of more than 25%. In multimode operation, optical slope efficiencies of more than 46% are observed.

We investigate experimentally the influence of the grating reflectivity, grating resolution, and diode facet antireflection (AR) coating on the intrinsic linewidth of an external-cavity diode laser built with a diffraction grating in a Littrow configuration. Grating lasers at 399, 780, and 852 nm are determined to have typical linewidths between 250 and 600 kHz from measurements of their freque...

Absorption spectroscopy with tunable diode lasers (TDLAS) in the infrared region is a well-known technique for the chemical analysis of gas mixtures. The laser provides a high selectivity, which is important in industrial environments such as in-line stack monitoring, where complex gas mixtures are present. A wavelength tunable diode laser in the near infrared region has been utilized as a ligh...

We present investigations of the the relative intensity noise (RIN) of a quantum cascade laser (QC) laser in continuous wave operation. We analyze the intensity noise properties in terms of the relative intensity noise (RIN). In contrast to conventional interband semiconductor diode lasers we obtain a different scaling behavior of RIN with increasing optical output power for QC lasers. From a s...

Soft tissue lasers are increasing in popularity among clinicians in part due to their potential value in preprosthetic gingival procedures. The ability of soft tissue lasers to control moisture and facilitate hemostasis appears particularly promising for clinicians excising gingival tissues, performing esthetic crown lengthening, and using resective techniques for gingival troughing--and these ...