(19)
(11)EP 2 662 940 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
08.01.2014 Bulletin 2014/02

(43)Date of publication A2:
13.11.2013 Bulletin 2013/46

(21)Application number: 13177766.6

(22)Date of filing:  30.07.2009
(51)Int. Cl.: 
H01S 3/109  (2006.01)
H01S 3/13  (2006.01)
H01S 3/082  (2006.01)
H01S 3/107  (2006.01)
H01S 3/16  (2006.01)
H01S 3/06  (2006.01)
H01S 3/108  (2006.01)
H01S 3/136  (2006.01)
H01S 3/081  (2006.01)
H01S 3/0941  (2006.01)
H01S 3/08  (2006.01)
(84)Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

(30)Priority: 31.07.2008 GB 0813980

(62)Application number of the earlier application in accordance with Art. 76 EPC:
09784820.4 / 2308141

(71)Applicant: University Court of The University of St Andrews
St Andrews Fife KY16 9AJ (GB)

(72)Inventors:
  • Dunn, Malcolm Harry
    St Andrews Fife KY16 9SS (GB)
  • Stothard, David James Mark
    St Andrews Fife KY16 9SS (GB)
  • Rae, Cameron Francis
    St Andrews Fife KY16 9SS (GB)

(74)Representative: Kinsler, Maureen Catherine et al
Marks & Clerk LLP Atholl Exchange 6 Canning Street
Edinburgh EH3 8EG
Edinburgh EH3 8EG (GB)

  


(54)Control of relaxation oscillations in intracavity optical parametric oscillators


(57) An intra-cavity optical parametric oscillator including means for providing a non-linear loss for suppressing relaxation oscillations, wherein the means for providing the non-linear loss are variable. The laser resonator may be delimited by the back-facet HR coating (16) of an end-pumped laser gain medium (14) and an output coupler (18). The laser comprises an intra-cavity optical parametric oscillator with a non-linear crystal (24), the singly resonant OPO which is signal-resonant comprises a mirror (26) and the common output coupler (18) and a dichroic beam splitter (22) reflecting the signal radiation and transmitting the laser fundamental. The amplitude of circulating laser fundamental may be stabilized inside the laser resonator by a feedback loop comprising a photodetector (38), a controller (40) and an optical modulator (3) in the resonator.