{"id":54,"date":"2013-01-05T12:42:05","date_gmt":"2013-01-05T04:42:05","guid":{"rendered":"http:\/\/laser.im\/english\/?p=54"},"modified":"2013-01-05T12:44:18","modified_gmt":"2013-01-05T04:44:18","slug":"summary-2012","status":"publish","type":"post","link":"https:\/\/laser.im\/possible\/2013\/01\/summary-2012\/","title":{"rendered":"A short summary of what we have done in 2012"},"content":{"rendered":"<p>To continue the guide star laser work, we have first researched\u00a0<a href=\"http:\/\/www.sciencedirect.com\/science\/article\/pii\/S0030401812000272\">ways to generate linearly polarized Yb doped fiber laser<\/a>, and are now able to build<a href=\"http:\/\/www.opticsinfobase.org\/oe\/abstract.cfm?uri=oe-20-27-28373\">100 W class linearly polarized 1120 nm Yb-doped fiber laser<\/a>\u00a0with\u00a0<a href=\"http:\/\/www.opticsinfobase.org\/ao\/abstract.cfm?uri=ao-51-17-3801\">cross-axis-matched FBG pairs written in polarization maintaining fiber<\/a>. We improved the SBS suppression technique further, and\u00a0<a href=\"http:\/\/www.opticsinfobase.org\/ol\/abstract.cfm?uri=ol-37-22-4796\">achieved a 44 W single frequency Raman fiber amplifier at 1178 nm with an optical efficiency of 52 %. Up to 25 W at 589 nm\u00a0<\/a>has been demonstrated with a home-built frequency doubling cavity, which is not yet optimized.<\/p>\n<p>Mode locking of fiber laser is another fascinating field we are interested. We studied\u00a0<a href=\"http:\/\/ieeexplore.ieee.org\/xpl\/articleDetails.jsp?tp=&amp;arnumber=6308751\">mode locking of Raman fiber laser with graphene absorber<\/a>. The idea is simple: To achieve wavelength versatile mode locked fiber laser by combining the shared advantage of Raman gain and graphene saturable absorption, both of which is broadband. During the path, we have demonstrated\u00a0<a href=\"http:\/\/iopscience.iop.org\/1612-202X\/9\/12\/009\">passively Q-switched Yb-doped fiber laser by graphene<\/a>, and the\u00a0<a href=\"http:\/\/www.opticsinfobase.org\/ol\/abstract.cfm?uri=ol-37-18-3828\">use of single-multi-single mode fiber structure as bandpass filter for building all fiber tunable dissipative soliton fiber laser<\/a>.<\/p>\n<p>The SBS suppression technique was applied to single frequency Yb doped fiber laser, and achieved 170 W linearly polarized laser with a 10 micron core PM fiber by 7 time increase of SBS threshold. We also find Yb doped fiber laser at the wing of gain spectrum interesting. One example is a demonstration of high power single frequency 1014.8 nm fiber amplifier working at room temperature for mercury cooling after frequency quadruplication. These works are not yet published.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>To continue the guide star laser work, we have first researched\u00a0ways to generate linearly polarized Yb doped fiber laser, and are now able to build100 W class linearly polarized 1120 nm Yb-doped fiber laser\u00a0with\u00a0cross-axis-matched FBG pairs written in polarization maintaining fiber. We improved the SBS suppression technique further, and\u00a0achieved a 44 W single frequency Raman [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[8,7,6,9],"class_list":["post-54","post","type-post","status-publish","format-standard","hentry","category-research-news","tag-graphene","tag-mode-locked-fiber-laser","tag-raman-fiber-amplifier","tag-stimulated-brillouin-scattering"],"_links":{"self":[{"href":"https:\/\/laser.im\/possible\/wp-json\/wp\/v2\/posts\/54","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/laser.im\/possible\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/laser.im\/possible\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/laser.im\/possible\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/laser.im\/possible\/wp-json\/wp\/v2\/comments?post=54"}],"version-history":[{"count":3,"href":"https:\/\/laser.im\/possible\/wp-json\/wp\/v2\/posts\/54\/revisions"}],"predecessor-version":[{"id":56,"href":"https:\/\/laser.im\/possible\/wp-json\/wp\/v2\/posts\/54\/revisions\/56"}],"wp:attachment":[{"href":"https:\/\/laser.im\/possible\/wp-json\/wp\/v2\/media?parent=54"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/laser.im\/possible\/wp-json\/wp\/v2\/categories?post=54"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/laser.im\/possible\/wp-json\/wp\/v2\/tags?post=54"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}