Generation of radially polarized beams based on thermal analysis of a working cavity

Abstract

The laser oscillation and polarization behavior of a side-pumped Nd:YAG laser are studied theoretically and experimentally by a thermal model for a working cavity. We use this model along with the Magni method, which gives a new stability diagram, to show important characteristics of the resonator. High-power radially and azimuthally polarized laser beams are obtained with a Nd:YAG module in a plano-plano cavity. Special regions and thermal hysteresis loops are observed in the experiments, which are concordant with the theoretical predictions.

Laguerre-Gaussian modes selection in diode-pumped solid-state lasers

“…125,126) In order to have a scheme that permits formation of both RP and AP low and high-order LG vector modes we 81) modified the Yb:YAG laser, described in x3.1. The design of the resonator is shown in Fig.…”

Heat Generation and Removal in Solid State Lasers

“…Also z is the distance along the disk axis in the thickness of the disk and h is the thickness of the disk. In particular, one can calculate maximum temperature from relation (19) …”

“…In this way using relations (19) to (21) one can evaluate, temperature distribution and maximum and average temperature in the disk in one dimensional heat conduction approximation.…”

“…This is the main reason of appearance of unwanted thermal effects on laser operation. Thermal lensing [14], thermal stress fracture limit [15], thermal birefringence and thus thermal bifocusing [16][17][18][19] are some examples of thermal effects.…”

Degree of paraxiality of cylindrical vector partially coherent Laguerre–Gaussian beams

“…Due to the unique polarization characteristic, there has found many applications of the CV beams in optical trapping, dark-field microscopy, optical data storage and free-space optical communication [2][3][4][5][6][7]. Up to now, several theoretical models (e.g., Laguerre-Gaussian model, Bessel-Gaussian and Modified BesselGaussian models) which are all the solutions of Maxwell's equation have been proposed to describe the CV beams [8][9][10], and much work has been devoted to experimental achievement of the CV beams including active and passive technique [11][12][13][14][15][16]. Meanwhile, the study of the paraxial or nonparaxial propagation and tight focusing properties of the CV beams remain of continued interest in optics [17][18][19][20][21][22].…”