Patent SG-11201901601P-A (SG)
Title: Modal instability control in fiber lasers
Inventor: SACKS ZACHARY
IPC: H01S3/13
Filed: 2017-08-23
Abstract: PUMPDIODES IT CONTROL MODULE -120 (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (43) International Publication Date 01 March 2018 (01.03.2018) W I PO I PCT Iiiimmomitia °nolo oui Imo mil °mono oimIE (10) International Publication Number WO 2018/037413 Al (51) International Patent Classification: HOlS 3/091 (2006.01) HOlS 3/13 (2006.01) (21) International Application Number: PCT/IL2017/050942 (22) International Filing Date: 23 August 2017 (23.08.2017) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: 247506 25 August 2016 (25.08.2016) IL (71) Applicant: ELBIT SYSTEMS ELECTRO-OPTICS EL- OP LTD. [IL/IL]; 5 Hamada Street, 7670305 Rehovot (IL). (72) Inventors: SACKS, Zachary; 5 Hamada Street, 7670305 Rehovot (IL). HOVHANNISYAN, Grigor; 5 Hamada Street, 7670305 Rehovot (IL). (74) Agent: WEILER, Assaf et al.; Pearl Cohen Zedek Latzer Baratz, P.O. Box 7198, Tel Aviv 6107121 (IL). (81) Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (54) Title: MODAL INSTABILITY CONTROL IN FIBER LASERS Figure 3 (57) : Fiber lasers and methods are provided, in which the modal instability threshold is raised to provide more laser power. M Fiber lasers comprise an active optical fiber having at least one absorption peak wavelength (`) and capable of supporting more than peak 1-1 71- a fundamental mode during operation, and a plurality of pump diodes connected to deliver radiation emitted thereby into the optical IN fiber. At least one of the pump diodes is a wavelength-locked (WL) diode and at least one of the pump diodes is configured to deliver en radiation at at least ._ 1 , ),-- eak (not necessarily the same diode(s)). The pump diodes may comprise any of WL diode(s) at 24Xpeak, WL ot diode(s) at ?=Xpeak and non-WL diode(s). Pumping radiation off the fiber's absorption peak increases the modal instability threshold, 1-1 most likely by reducing the temperature gradient in the active fiber at the fiber pump entrance point and along the fiber. O C [Continued on next page] WO 2018/037413 Al MIDEDIMOMOIDEIREEMOOMMEMIUMMOVOIS (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). Published: — with international search report (Art. 21(3))