Narrow Linewidth Laser Technology Chikamu Chechipiri

Narrow Linewidth Laser Technology Chikamu Chechipiri

(3)Solid state laser

Muna 1960, yekutanga pasi rose ruby ​​laser yaive yakasimba-nyika laser, inoratidzwa neyakakura kubuda simba uye yakafara wavelength kufukidzwa. Iyo yakasarudzika spatial chimiro cheiyo solid-state laser inoita kuti iwedzere kuchinjika mukugadzirwa kweyakatetepa mutsara wekubuda. Parizvino, nzira huru dzakaitwa dzinosanganisira nzira pfupi yegomba, nzira imwe chete yemhete yegomba, intracavity standard nzira, torsion pendulum mode cavity nzira, vhoriyamu Bragg grating nzira uye nzira yejekiseni yembeu.

Mufananidzo 7 unoratidza chimiro che akati wandei akajairwa single-longitudinal modhi solid-state lasers.

Mufananidzo 7 (a) unoratidza mutemo wekushanda we single longitudinal mode kusarudzwa zvichienderana ne-in-cavity FP standard, kureva, iyo yakamanikana mutsara wepamhepo transmission spectrum yechiyero inoshandiswa kuwedzera kurasikirwa kwemamwe marefu mamodhi, kuitira kuti mamwe marefu modes. dzakaseferwa kunze kweiyo modhi yemakwikwi maitiro nekuda kwediki diki transmittance, kuitira kuti uwane imwechete longitudinal mode kushanda. Uye zvakare, imwe mhando yewavelength tuning inobuda inogona kuwanikwa nekudzora iyo Angle uye tembiricha yeFP standard uye nekushandura iyo longitudinal mode kupindirana. FIG. 7 (b) uye (c) ratidza iyo isiri-planar ring oscillator (NPRO) uye torsional pendulum mode cavity nzira inoshandiswa kuwana imwechete longitudinal mode kubuda. Nheyo yekushanda ndeyekuita kuti danda ripararire munzira imwe chete mune resonator, zvinobudirira kubvisa kusaenzana kwenzvimbo kugoverwa kwenhamba yezvikamu zvakadzoserwa mune yakajairwa yakamira wave cavity, uye nekudaro kudzivirira pesvedzero yenzvimbo yekupisa gomba kuti uwane single longitudinal mode kubuda. Nheyo yehuwandu hweBragg grating (VBG) sarudzo yemodhi yakafanana neye semiconductor uye faibha nhete mutsara-upamhi lasers yambotaurwa, ndiko kuti, nekushandisa VBG sechinhu chesefa, zvichibva pane yayo yakanaka spectral selectivity uye Angle selectivity, iyo oscillator. oscillates pane imwe wavelength kana bhendi kuti uwane basa rekusarudzwa kwemaitiro ekureba, sezvakaratidzwa mumufananidzo 7 (d).
Panguva imwecheteyo, nzira dzinoverengeka dzelongitudinal modhi dzekusarudza dzinogona kusanganiswa zvinoenderana nezvinodiwa kuvandudza iyo longitudinal modhi sarudzo kurongeka, kuwedzera kupfupisa mutsara, kana kuwedzera iyo mode yemakwikwi kusimba nekuunza nonlinear frequency shanduko uye dzimwe nzira, uye kuwedzera inobuda wavelength ye. iyo laser paunenge uchishanda mumutsara wakamanikana, izvo zvakaoma kuitasemiconductor laseruyefiber lasers.

(4) Brillouin laser

Brillouin laser yakavakirwa pakusimudzirwa kweBrillouin kuparadzira (SBS) kuita kuti iwane ruzha rwakaderera, yakatetepa linewidth yekubuda tekinoroji, musimboti wayo uri kuburikidza nephoton uye yemukati acoustic munda kupindirana kugadzira imwe frequency shanduko yeStokes photons, uye inoramba ichiwedzerwa mukati kuwana bandwidth.

Mufananidzo 8 unoratidza dhayagiramu yedanho rekushandurwa kweSBS uye chimiro chekutanga cheBrillouin laser.

Nekuda kweiyo yakaderera vibration frequency yeacoustic field, iyo Brillouin frequency shift yechinhu inowanzongoita 0.1-2 cm-1, saka ne1064 nm laser semwenje wepombi, iyo Stokes wavelength inogadzirwa kazhinji inongoita 1064.01 nm, asi izvi zvinoreva zvakare kuti quantum shanduko inoshanda yakakwira zvakanyanya (kusvika 99.99% mudzidziso). Pamusoro pezvo, nekuti iyo Brillouin inowana mutsara wepakati pepakati kazhinji inongori yehurongwa hweMHZ-ghz (iyo Brillouin inowana mutsara weimwe yakasimba midhiya inongosvika gumi MHz), ishoma pane kuwana mutsara weiyo laser inoshanda chinhu. yehurongwa hwe100 GHz, saka, The Stokes kufara muBrillouin laser inogona kuratidza pachena spectrum narrowing phenomenon mushure mekuwedzeredza kwakawanda mukati memhango, uye yaro yekubuda mutsetse upamhi ine akati wandei mirairo yehukuru yakatetepa kupfuura iyo pombi mutsetse upamhi. Parizvino, Brillouin laser yave hotspot yekutsvagisa mumunda wefotonics, uye kwave nemishumo yakawanda paHz uye sub-Hz kurongeka kweyakatetepa kwazvo mutsara wekubuda.

Mumakore achangopfuura, Brillouin zvishandiso zvine waveguide chimiro zvakabuda mumunda wemicrowave photonics, uye vari kukurumidza kukurumidza munzira ye miniaturization, kubatanidzwa kwepamusoro uye kugadzirisa kwepamusoro. Pamusoro pezvo, iyo nzvimbo-inomhanya yeBrillouin laser yakavakirwa pazvinhu zvitsva zvekristaro sedhaimondi yakapindawo muchiratidzo chevanhu mumakore maviri apfuura, kubudirira kwayo musimba reiyo waveguide chimiro uye cascade SBS bottleneck, simba reBrillouin laser. kusvika ku10 W ukuru, kuisa hwaro hwekuwedzera kushandiswa kwayo.
General junction
Nekuenderera mberi nekutsvagisa ruzivo rwekucheka-kumucheto, yakatetepa mutsara lasers yave chishandiso chakakosha mukutsvagisa kwesainzi nekuita kwavo kwakanaka, senge laser interferometer LIGO yekuona mafungu emagetsi, inoshandisa imwe-frequency nhete mutsara.laserine wavelength ye1064 nm sechitubu chembeu, uye mutsara wechiedza chembeu chiri mukati me5 kHz. Uye zvakare, yakamanikana-hupamhi lasers ine wavelength tunable uye hapana modhi yekusvetuka inoratidza hukuru hwekushandisa, kunyanya mukutaurirana kwakabatana, iyo inogona kunyatsozadzisa zvinodiwa zvewavelength division multiplexing (WDM) kana frequency division multiplexing (FDM) yewavelength (kana frequency). ) kugadzikana, uye inotarisirwa kuve iyo yakakosha mudziyo wechizvarwa chinotevera chenharembozha yekutaurirana tekinoroji.
Mune ramangwana, kuvandudzwa kwezvinhu zvelaser uye kugadzirisa tekinoroji kuchawedzera kusimudzira kudzvanywa kwelaser linewidth, kuvandudzwa kwefrequency kugadzikana, kuwedzera kwewavelength renji uye kuvandudzwa kwesimba, kugadzira nzira yekuongorora kwevanhu nyika isingazivikanwe.