In this paper we describe several diagnostics that we have developed to assist the development of high power gas phase lasers including COIL, EOIL, and DPAL. For COIL we discuss systems that provide sensitive measurements of O2(a), small signal gain, iodine dissociation, and temperature. These are key operational parameters within COIL, and these diagnostics have been used world-wide to gain a ...

Twenty-five new, cw, FIR lines from CH(2)F(2), optically pumped by a CO(2) laser, have been found, using a variablecoupling, open-structure resonator. Accurate wavelength measurements have been made on the 47 known CH(2)F(2) lines. The new lines are fairly uniformly distributed over a wide range, from 105 to 1448 microm.

The fundamental knowledge contained in the previous paper on “Cavity control system essential modeling for TESLA linear accelerator and free electron laser” is applied for Matlabs’ Simulink implementation of the basic models for the cavity resonator. Elementary simulations of the cavity behavior are carried out and some experimental results for signals and power considerations are presented.

Customizing the output beam shape from a laser invariably involves specialized optical elements in the form of apertures, diffractive optics and free-form mirrors. Such optics require considerable design and fabrication effort and suffer from the further disadvantage of being immutably connected to the selection of a particular spatial mode. Here we overcome these limitations with the first dig...

We analyze the physical mechanisms limiting optical fiber resonator length and report on the longest ever laser cavity, reaching 270 km, which shows a clearly resolvable mode structure with a width of approximately 120 Hz and peak separation of approximately 380 Hz in the radio-frequency spectrum.

We have demonstrated that a hybrid laser array, combining graded-photonic-heterostructure terahertz semiconductor lasers with a ring resonator, allows the relative phase (either symmetric or anti-symmetric) between the sources to be fixed by design. We have successfully phase-locked up to five separate lasers. Compared with a single device, we achieved a clear narrowing of the output beam profile.

Photon hopping and nanowire based hybrid plasmonic waveguide and ring-resonator Zhiyuan Gu, Shuai Liu, Shang Sun, Kaiyang Wang, Quan Lv, Shumin Xiao † , Qinghai Song 3,* Department of Electrical and Information Engineering, Harbin Institute of Technology, Shenzhen, Guangdong, China, 518055, Department of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, Guangdong, Chi...

The frequency stability of lasers is limited by thermal noise in state-of-the-art references. Further improvement requires operation at cryogenic temperature. In this context, we investigate a fiber-based ring resonator. Our system exhibits first-order temperature-insensitive point around $3.55$ K, much lower than that crystalline silicon. observed low sensitivity with respect to vibrations ($<...