A new Faraday rotator for high average power lasers

<title>Use of parallel axicon for compensation of birefringence in active elements of solid state lasers</title>

“…Taking into account expression (12), this means that eigenpolarizations ofthe 2J4 plane in all cross-sectional points coincide with axes of the incident polarization ellipse ( kPa O ). It can be easily noted that the polarization in the F plane will be linear regardless of r and p , and the angle of its inclination is different in different points ofthe cross-section: o; =6(r,)=0(q)+arctg((r)) = +N+arctg(a(r)) i = 0 (13) Thus, the point on the Poincare sphere is now on the equator. Reflection from the mirror does not have any influence upon linear polarization; therefore, formulas (13) are valid both for forward and return passes, and points F and F on the Poincare sphere coincide.…”

“…Consequently, for any plane in Fig. 3 the following equalities must be valid (19) From expressions (9)(10)(11)(12)(13)(14)(15)(16)(17) it is seen that condition (19) is valid for all planes. On the Poincare sphere the complex-conjugate polarizations are represented by pairs ofpoints on the same meridian and the same latitude but in different hemispheres, i.e., symmetrical points relative to the equator plane.…”

“…A X/4 plate and a conventional mirror 10 can compensate for the depolarization only when heat release in AE is small 11-13 Porro prisms require special dielectric coatings to be applied onto internally reflecting surface l, 14• The so-called Faraday mirror (FM), a combination of a 45°F araday rotator and a mirror (dashed rectangle in Fig. 1) has been long and very effectively used to compensate for the birefringence in laser amplifiers 1548, oscillators and regenerative amplifiers 20• However, at high average powers the FM itself inserts the depolarization due to absorption of radiation in the magneto-optical medium 13,2022 This reduces the effectiveness of compensation of the birefringence in AE 13, Calculations show that the use of the recently developed designs of the Faraday isolator for high average powers 2224 in FM is ineffective. In Ref.…”

Wave-front dividing beam combined laser fusion driver using stimulated Brillouin scattering phase conjugation mirrors

“…45 • Faraday rotators (FRs), as polarization rotators, are located on the amplification beam line for the compensation of the thermally induced birefringence [31,32]. However, if the FRs have their own polarization distortions at the high energy laser operation, they can be replaced by new FRs proposed by Khazanov [33,34].…”

Faraday Isolators for High Average Power Lasers

“…Second, the radiation that is incident on the MOE in FI is linearly polarized, whereas the radiation that is incident on the Faraday mirror has already been depolarized. We shall consider only FI; a Faraday mirror for high power lasers is studied in (Khazanov, 2001;Khazanov et al, 2002b;Khazanov, 2004). In the absence of thermal effects in the MOE after the first pass (from left to right), a beam retains its horizontal polarization ( Fig.…”