Stable single-mode operation of intracavity-doubled diode-pumped Nd:YVO4 lasers: theoretical study

Helmfrid, Sten; Tatsuno, Kimio

doi:10.1364/josab.11.000436

Cited by 39 publications

(13 citation statements)

References 16 publications

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“…Equations (22,21) are the required results: they give the upper boundary in the (w, γ) plane for the stable single mode operation and the intensity of the first mode on that boundary. In Figure 2, this stability boundary is plotted in the (w, γ) plane as the curve labelled GLB.…”

Section: The Two-mode Thresholdmentioning

confidence: 99%

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Global rate equation description of a laser

Mandel

2000

The European Physical Journal D - Atomic, Molecular and Optical

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Abstract. The global integro-differential rate equations describing a multimode laser are analyzed. Expressions for the relaxation oscillation frequencies and their damping rates in the single-mode and two-mode regimes are obtained without specifying either the cavity geometry or the longitudinal pump profile. On the same level of generality, we prove the existence of universal relations relating the peaks of the power spectra in the two-mode regime. For a Fabry-Perot with arbitrary longitudinal pump profile, series expansions of all the physical functions are derived in powers of the pump moments. These moments are averages of the pump profile over cavity modes at linear combinations of the lasing frequencies and their harmonics. These results apply to end-pumped and/or partially filled lasers. For a single mode Fabry-Perot laser, we prove that the contribution to the steady state intensity from the lasing mode varies from 75% close to the lasing threshold to zero at high intensity. The remainder comes from the harmonics of the lasing mode. Analyzing the steady state single mode intensity equation in terms of the pump gratings, we prove that close to the lasing threshold only the space average of the pump and its grating oscillating at twice the lasing wave number do not vanish. This provides a hint towards the justification of the usual modal rate equations which retain only these two functions in the dynamical evolution of a laser. For a Fabry-Perot with constant pump profile, an exact expression for the upper boundary of the stable single mode regime is derived. In that two-mode regime, we prove that there is a critical value of the pump at which the ratio of the two relaxation oscillation frequencies is 2, leading to an internal resonance.PACS. 42.55.Ah General laser theory -42.65.Sf Dynamics of nonlinear optical systems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics

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Section: The Two-mode Thresholdmentioning

confidence: 99%

“…This leads to equation (6) for the single mode intensity equation with w replaced by the space average of w(z), but fails to reproduce equation (20) for the modal intensity at the lower boundary of the two-mode regime. The case of end-pumping was considered in [21] though with the same shortcoming as in [20].…”

Section: The Two-mode Thresholdmentioning

confidence: 99%

Global rate equation description of a laser

Mandel

2000

The European Physical Journal D - Atomic, Molecular and Optical

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“…2,3) The dopant in the gain medium of frequencydoubled lasers should have a transition with a high emission cross-section at a phase-matchable wavelength and the transition should, preferably, be a four level system. It is also important to have a wide absorption band at a wavelength where high-power laser diodes are available.…”

Section: Introductionmentioning

confidence: 99%

Influence of Spot Size and Spectral Width of the Pump Radiation on the Efficiency of Laser-Diode-Pumped Solid-State Lasers

Helmfrid

Andou

Nakatsuka

et al. 1995

OPT REV

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on When mini-solid-state lasers are end-pumped by diode lasers, it is important to have a good overlap between the pump beam and the oscillating mode and to have a pump spectrum that is narrow compared to the width of the absorption peak in the gain medium. We have theoretically studied the influence of the beam radius and the spectral width of the pump on the performance of diode-pumped devices. From the rate equations, the lasing threshold and the circulating intensity is evaluated numerically and the results can be used as a guideline in the design of intracavity doubling lasers. It is also shown that single-mode operation is more difficult when the pump spectrum becomes to wide.

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“…It can be seen from Fig.3 that the output power from the dual orthogonal gain crystals is always higher than the sum of the individual laser powers. The higher extraction efficiency for laser oscillation in our configuration arises because the longitudinal modes in solid-state lasers with birefringent intra-cavity elements are split into two orthogonal polarization modes [12] which are preferentially amplified by crystal C1 or C2. Therefore, the residual gain in one crystal will be extracted by the laser beam from the other crystal.…”

mentioning

confidence: 99%

Output characteristics of Nd:GdVO4 crystals laser with dual c-axis orthogonal gains end-pumped by two fiber-coupled diode lasers

Lin

Xiong

2015

Optoelectron. Lett.

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The output characteristics of neodymium-doped gadolinium vanadate (Nd:GdVO 4 ) crystals laser with dual c-axis orthogonal gains end-pumped by two fiber-coupled diode lasers are investigated. With two 1 W semiconductor diode lasers pumping, the output power of TEM 00 laser is 920 mW, and the optical conversion efficiency is close to 46%. By changing the relative orientations of both Nd:GdVO 4 crystals, the polarization characteristics of laser are varied. In particular, by keeping the c-axes of two Nd:GdVO 4 crystals orthogonal to each other and adjusting two diode pump lasers to operate at the same power level, the completely unpolarized light is obtained.

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Stable single-mode operation of intracavity-doubled diode-pumped Nd:YVO4 lasers: theoretical study

Cited by 39 publications

References 16 publications

Global rate equation description of a laser

Global rate equation description of a laser

Influence of Spot Size and Spectral Width of the Pump Radiation on the Efficiency of Laser-Diode-Pumped Solid-State Lasers

Output characteristics of Nd:GdVO4 crystals laser with dual c-axis orthogonal gains end-pumped by two fiber-coupled diode lasers

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