Diode-end-pumped continuous wave single-longitudinal-mode Nd:GdVO₄laser at 1342 nm

Abstract

A diode-end-pumped continuous wave (cw) single-longitudinal-mode Nd:GdVO(4) laser at 1342 nm is reported. A ring laser resonator was designed and the mode-to-pump ratio was optimized to achieve higher output power. A maximum output power of 3.1 W cw single-longitudinal-mode laser at 1342 nm was obtained, and the measured stability of laser output power was better than ±1% in the given 2 h. The experimental results are in good agreement with the theoretical calculation considering the energy-transfer upconversion.

Single-longitudinal-mode Nd:GdVO4 laser at 912 nm with optimum laser medium length considering the temperature distribution

“…By changing the resonator length between M3 and M4, the laser beam radius in the Nd:GdVO 4 laser crystal could be adjusted to keep a mode-to-pump ratio ω 0 /ω pa of 0.6 [14]. The thermal focal length was measured with the planeparallel resonator method [15][16][17] before the determination of the ring resonator length. The measured results are shown in figure 3 (squares, dots, triangles, diamonds, and stars), in which the solid lines are the theoretical calculation [13,18] for five different laser crystal lengths of the Nd-doped part (from top to bottom, 3 mm to 7 mm).…”

“…where T is the transmission of the output coupler, δ f is the non-diffraction round-trip loss, and δ d is the diffraction loss due to the thermally induced spherical aberration which can be calculated by [14,17,[20][21][22]]…”

A diode-end-pumped continuous-wave single-longitudinal-mode Nd:GdV O4–LBO red laser at 670 nm

“…Many works [16][17][18][19][20] have revealed that the fundamental wave output power is a function of the mode-to-pump ratio ω 0 /ω pa , and there exists an optimum mode-to-pump ratio for maximum fundamental wave output power considering the thermally induced diffraction losses obtained by changing the cavity length. Here ω pa is the average pump beam radius inside the laser medium and is given by [21]…”

Comprehensive analysis of heat generation and efficient measurement of fractional thermal loading in a solid-state laser medium

“…For ESA, ESAPR or ESALR it results in the reduction of the population of the upper laser level and the degradation of laser conversion efficiency, and so it can be described by an effective absorption cross-section σ ESA (ESALR) involving the two higher order processes simultaneously [5]. For diodeend-pumped Nd:GdVO 4 lasers, neglecting the depletion of the ground state population, the four-level rate equation for the upper laser level population density N b and the total laser photon number in the cavity Φ involving the coexistence of the ETU and ESA effects can be written as [5,18,19]…”