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Ce-doped LiYF4 growth under CF4 atmosphere

Abstract Single crystals of Ce-doped LiYF 4 have been grown by the Czochralski technique directly from raw materials under CF 4 atmosphere. Optically clear single crystals were obtained without the previous conventional hydrofluorination of the starting charge or the direct use of HF during the growth process. Optical characteristics were examined and compared with those of other rare-earth LiYF 4 -doped crystals.

High-Pulse-Energy, All-Solid-State, Ultraviolet Laser Oscillator Using Large Czochralski-Grown Ce:LiCAF Crystal

A large Ce3+:LiCaAlF6 (Ce:LiCAF) crystal of 15 mm diameter was grown successfully by the Czochralski method. Owing to its large size, the Ce:LiCAF crystal demonstrated a maximum output pulse energy from the Ce:LiCAF laser of 21 mJ at a wavelength of 290 nm with an absorbed pump energy of 54 mJ from the fourth harmonic of a Q-switched Nd:YAG laser operated at a 10-Hz repetition rate. Furthermore, the lasing threshold was a low 12 mJ, and the slope efficiency was 39%.

Direct Generation of 27-mJ, 309-nm Pulses from a Ce3+:LiLuF4 Oscillator Using a Large-Size Ce3+:LiLuF4 Crystal.

An ultraviolet solid-state Ce3+:LiLuF4 (Ce:LLF) laser which was pumped transversely by a KrF excimer laser with the repetition rate of 1 Hz produced a 27-mJ, 309-nm pulse using a large-size Ce:LLF crystal which was grown by the Czochralski (CZ) method, and the slope efficiency was approximately 17%.

LiCAF crystal as a new vacuum ultraviolet optical material with transmission down to 112 nm

We report the superior transmission characteristics of LiCaAlF/sub 6/ (LiCAF) down to 112 nm. From the transparent wavelength shorter than that of conventional LiF, the non-hydroscopic nature of LiCAF, and the better mechanical properties compared with LiF, LiCAF is shown to be an ideal optical material for the vacuum ultraviolet region.

Growth and characterization of new oxide and fluoride crystals for optical applications

High quality oxide and fluoride single crystals for optical applications have been grown by the Czochralski technique. Lattice parameter investigation of grown Gd3YbxGa5−xO12 suggested that this crystal will be a superior material as substrate for optical isolators with large Faraday effect. Growth conditions of (La,Sr)(Al,Ta)O3 single crystals are discussed. These crystals have excellent lattice matching with GaN, a promising material for optoelectronic devices. Ce-doped fluoride single crystals—LiCaAIF6, LiYF4 and BaLiF3—have been grown for solid state UV laser applications. Growth results and optical characterization are discussed.

High-pulse-energy ultraviolet Ce:LLF and Ce:LiCAF lasers using CZ-grown large-size crystals and new cavity configuration

Summary form only given. Ce/sup 3+/:LiCaAlF/sub 6/ (Ce:LiCAF) and Ce/sup 3+/:LiLuF/sub 4/ (Ce:LLF) have been identified to be efficient and convenient ultraviolet (UV) lasing media. We have demonstrated an all-solid-state tunable Ce:LLF laser pumped by the fifth harmonic of an Nd:YAG laser. We have also demonstrated an efficient Ce:LiCAF MOPA system. Previously, the output energy was limited by available crystal sizes. Therefore, we grow larger crystals up to about 1-inch diameter by Czochralski (CZ) method. In this presentation, we report the generation of 27-mJ pulse from a Ce:LLF oscillator and 60-mJ pulse from a Ce:LiCAF oscillator using large-size Ce:fluoride crystals. Furthermore, a new pumping configuration with pumping at Brewster angles on the disk-shaped crystal was designed.

Observation of new excitation channel of cerium ion through LiCAF host crystal

Summary form only given. Ce/sup 3+/:LiCaAlF/sub 4/ (Ce:LiCAF) is already known as practical tunable ultraviolet laser crystal pumped with the fourth harmonic of an Nd:YAG laser. 60 mJ output from this laser medium was already demonstrated with large-sized CZ-grown crystal. If other pumping schemes were available, it would expand the applicability of this laser medium. In this paper, we report on the observation of new excitation channel of Ce/sup 3+/ through LiCAF host crystal.

Direct generation of 27-mJ, 309-nm pulses from a Ce:LLF oscillator using a large-size Ce:LLF crystal

An ultraviolet solid-state Ce3+:LiLuF4 laser which was pumped by a KrF excimer produced a 27-mJ, 309-nm pulse using a large Ce3+:LiLuF4 crystal.

Novel design of high-pulse-energy ultraviolet Ce:LiCAF laser oscillator

60-mJ pulses were generated directly from a quasi-coaxially pumped Ce:LiCAF laser. Additionally, a new non-collinear Brewster-pumping disk oscillator scheme was demonstrated for further output-energy scaling.

Czochralski-grown large Ce:LiCAF crystal for efficient UV laser with output up to 60-mJ

The Ce/sup 3+/:LiCaAlF/sub 6/ (Ce:LiCAF) laser has emerged as a convenient, compact, tunable ultraviolet source in the spectral region from 281 to 315 nm. For expanding applications of the Ce:LiCAF lasers, the output energy scalability is the significant issue. Previously, Pinto et al in the US Naval Research Laboratory and our group in IMS reported around 15-mT output from Ce:LiCAF lasers using rather small crystals. In this presentation, we talk about the growth of large Ce:LiCAF crystals and 60 mJ pulse generation from a Ce:LiCAF laser that operated at 289 nm at 10-Hz.