(19)
(11)EP 0 231 050 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
23.08.1989 Bulletin 1989/34

(43)Date of publication A2:
05.08.1987 Bulletin 1987/32

(21)Application number: 87200120.1

(22)Date of filing:  27.01.1987
(51)International Patent Classification (IPC)4H01S 3/081
(84)Designated Contracting States:
AT BE CH DE FR GB LI LU NL SE

(30)Priority: 29.01.1986 IT 1922386

(71)Applicant: CONSIGLIO NAZIONALE DELLE RICERCHE
I-00198 Roma (IT)

(72)Inventors:
  • De Silvestri, Sandro
    I-20141 Milano (IT)
  • Laporta, Paolo
    I-20060 Cassina de' Pecchi Milano (IT)
  • Svelto, Orazio
    I-20090 Segrate Milano (IT)

(74)Representative: Marchi, Massimo 
c/o Marchi & Mittler s.r.l. Viale Lombardia 20
20131 Milano
20131 Milano (IT)


(56)References cited: : 
  
      


    (54)Unstable laser resonator with output coupler having radially variable reflectivity


    (57) The resonator has an output coupler (2) represented by a pair of mirrors (9),(10) separated by an appropriate distance and with facing reflecting surfaces of differing curvature. The distance between the surfaces (D')(D'') and their curvatures (R'),(R'') are such as to dephase the laser rays reflected by the second mirror in a different manner at the centre and at the periphery of the coupler in relation to those reflected by the first mirror.







    Search report