Ọkụ laser nwere oke ugboro ugboro ugboro

Ọkụ laser nwere oke ugboro ugboro ugboro

N'ụwa microscopic nke mmekọrịta dị n'etiti ìhè na ihe, ultra-high repetitive rate pulses (UHRPs) na-arụ ọrụ dị ka ndị na-achị oge kpọmkwem - ha na-agbagharị na ihe karịrị otu ijeri ugboro kwa sekọnd (1GHz), na-ejide mkpịsị aka molekul nke mkpụrụ ndụ kansa na onyonyo spectral, na-ebu nnukwu data na nkwukọrịta eriri optical, ma na-ahazi nhazi ebili mmiri nke kpakpando na telescopes. Karịsịa na mmụba nke nha nchọpụta nke lidar, terahertz ultra-high repetitive rate pulsed lasers (100-300 GHz) na-aghọ ngwaọrụ dị ike iji banye na oyi akwa nnyonye anya, na-agbanwe ókè nke nghọta akụkụ atọ na ike njikwa spatiotemporal na ọkwa photon. Ugbu a, iji obere ihe owuwu arụrụ arụ, dị ka oghere mgbanaka micro-ring nke chọrọ izi ezi nhazi nanoscale iji mepụta ngwakọta ebili anọ (FWM), bụ otu n'ime ụzọ bụ isi iji nweta ultra-high repetitive rate optical pulses. Ndị ọkà mmụta sayensị na-elekwasị anya na idozi nsogbu injinia na nhazi nke ultra-fine structures, nsogbu nhazi ugboro ugboro n'oge mmalite pulse, na nsogbu arụmọrụ ntụgharị mgbe mmepụta pulse gasịrị. Ụzọ ọzọ bụ iji eriri ndị na-anaghị ahazi nke ọma ma jiri mmetụta enweghị ike ịgbanwe agbanwe ma ọ bụ mmetụta FWM n'ime oghere laser iji kpalie UHRPs. Ruo ugbu a, anyị ka chọrọ "ihe nhazi oge" nke na-eme ka ọ dịkwuo nkọ.

Usoro nke imepụta UHRP site na itinye pulses ultrafast iji kpalite mmetụta FWM na-agbasasị a kọwara dị ka "mgbanye ọkụ ultrafast". N'adịghị ka atụmatụ oghere microring arụrụ arụ nke a kpọtụrụ aha n'elu nke chọrọ mgbapụta na-aga n'ihu, mgbanwe ziri ezi nke detuning iji chịkwaa mmepụta pulse, na iji mgbasa ozi na-abụghị nke ahịrị iji belata oke FWM, "mgbanye ọkụ" a dabere na njirimara ike kachasị elu nke pulses ultrafast iji kpalite FWM ozugbo, na mgbe "gbanyụrụ ọkụ", nweta UHRP na-akwado onwe ya.

Foto nke 1 na-egosi isi usoro nke imezu nhazi onwe onye nke pulse dabere na mkpali mkpụrụ pulse nke oghere eriri mgbasa ozi. Mkpụrụ pulse ultrashort nke a na-agba n'èzí (oge T0, ugboro ugboro F) na-eje ozi dị ka "isi iyi ọkụ" iji kpalite ubi pulse dị ike n'ime oghere mgbasa ozi. Modulu uru intracellular na-arụ ọrụ na mmekorita ya na onye na-akpụ spectral iji gbanwee ike pulse mkpụrụ ka ọ bụrụ nzaghachi spectral dị ka comb site na nhazi nkwonkwo na ngalaba ugboro ugboro. Usoro a na-agbaji oke nke mgbapụta ọdịnala na-aga n'ihu: mkpụrụ pulse na-akwụsị mgbe ọ ruru oke FWM mgbasa ozi, oghere mgbasa ozi na-ejikwa ọnọdụ nhazi onwe onye nke pulse site na nguzozi ike nke uru na mfu, yana ugboro ugboro ugboro pulse bụ Fs (dakọtara na ugboro FF na oge T nke oghere).

Ọmụmụ ihe a mekwara nkwenye echiche. Dabere na paramita ndị a nabatara na ntọala nnwale ahụ yana 1pslaser pulse nke kachasị ọsọDịka ubi mbụ, e mere ihe ngosi ọnụọgụgụ na usoro evolushọn nke ngalaba oge pulse na ugboro ole dị n'ime oghere laser. Achọpụtara na pulse gafere usoro atọ: nkewa pulse, oscillation oge pulse, na nkesa otu pulse n'ime oghere laser dum. Nsonaazụ ọnụọgụgụ a na-enyochakwa njirimara nhazi onwe onye nkelaser pulse.

Site n'ịkpalite mmetụta ngwakọta ebili mmiri anọ n'ime oghere mgbanaka eriri mgbasa site na ọkụ mkpụrụ pulse ultrafast, mmepụta nke na-ahazi onwe ya na mmezi nke pulses ugboro ugboro ugboro sub-THZ dị elu (mmepụta kwụsiri ike nke ike 0.5W mgbe agbanyụrụ mkpụrụ) ka e nwetara nke ọma, na-enye ụdị isi iyi ọkụ ọhụrụ maka ubi lidar: Mgbanwe ọkwa sub-THZ ya nwere ike ime ka mkpebi igwe ojii dị elu ruo ọkwa milimita. Njirimara nke pulse na-ejide onwe ya na-ebelata oke oriri ike sistemụ. Nhazi eriri niile na-eme ka ọrụ kwụsie ike dị elu na band nchekwa anya 1.5 μm. Na-ele anya n'ọdịnihu, a na-atụ anya na teknụzụ a ga-akpali mgbanwe nke lidar ejiri ụgbọala rụọ gaa na miniaturization (dabere na nzacha obere MZI) na nchọpụta ogologo oge (mgbasawanye ike na > 1W), ma megharịa ya na ihe achọrọ nghọta nke gburugburu ebe dị mgbagwoju anya site na mgbanye agbakọtara ọtụtụ ebili mmiri na iwu ọgụgụ isi.