Mode-zokhoma pepala laser, mphamvu mkulu mphamvu ultrafast laser

High mphamvu femtosecondlaserili ndi phindu lalikulu pakufufuza zasayansi ndi mafakitale monga terahertz generation, attosecond pulse generation ndi optical frequency comb.Ma lasers otsekedwakutengera chikhalidwe cha block-gain media zimachepetsedwa ndi matenthedwe amagetsi amphamvu kwambiri, ndipo pakadali pano mphamvu yayikulu yotulutsa ndi 20 W.

Thin sheet laser imagwiritsa ntchito mawonekedwe a pampu yamitundu yambiri kuti iwonetserepompa kuwalaku pepala, pindulani pakati ndi makulidwe a ma microns 100 kuti muzitha kuyamwa bwino pampu. Sing'anga yowonda kwambiri yophatikizana ndi ukadaulo wa backcooling imachepetsa kwambiri chikoka cha matenthedwe a lens ndi zotsatira zopanda mzere, ndipo imatha kupeza mphamvu zapamwamba za femtosecond pulse.
Ma Wafer oscillator ophatikizidwa ndi ukadaulo wotsekera ma lens a Kerr ndiye njira yayikulu yopezera mphamvu zambiri zotulutsa mphamvu ya laser yokhala ndi pulse m'lifupi mwa dongosolo la femtosecond.

CHITH. 1 (a) 72 mawonekedwe owoneka bwino ndi (b) chithunzi chapampu

Gulu la ofufuza ochokera ku Chinese Academy of Sciences linapanga ndi kupanga laser lens mode-lock sheet laser yochokera pa module yodzipangira yokha ya 72-way pump, ndikupanga laser lens mode-lock sheet laser yokhala ndi mphamvu yayikulu kwambiri komanso imodzi. pulse energy ku China.
Kutengera mfundo ya Kerr lens mode-lock ndikuwerengera mobwereza bwereza kwa ABCD matrix, gulu lofufuza lidasanthula kaye chiphunzitso chotsekera cha makina otsekera a Kerr lens mode-lock laser, kutengera kusintha kwa resonator panthawi yotseka. ndi ntchito mosalekeza, ndipo anatsimikizira kuti patsekeke mode utali wozungulira pa diaphragm zolimba adzakhala yafupika kuposa 7% pambuyo mode-kutseka.

Pambuyo pake, motsogoleredwa ndi ndondomeko ya mapangidwe, gulu lofufuzira linapanga ndi kupanga kerr lens mode-locked resonator (FIG. 2) yochokera pa 72-way pump module (FIG.1) yomwe inapangidwa ndi gulu, ndipo inapeza laser pulsed laser. linanena bungwe ndi mphamvu pafupifupi 11.78W, kugunda m'lifupi 245 fs ndi kugunda kamodzi mphamvu ya 0.14μJ pa 72 W kupopera nthawi. M'lifupi mwa kugunda linanena bungwe ndi kusiyanasiyana kwa intracavity mode zimagwirizana bwino ndi kayeseleledwe zotsatira.

CHITH. 2 Chithunzi chojambula chapang'onopang'ono kwa kerr lens mode-locked Yb: YAG wafer laser yomwe imagwiritsidwa ntchito poyesera

Pofuna kupititsa patsogolo mphamvu yotulutsa laser, gulu lofufuza lidawonjezera utali wopindika wa galasi loyang'ana, ndikuwongolera makulidwe apakati a Kerr ndi kubalalitsidwa kwachiwiri. Pamene mphamvu ya mpope inakhazikitsidwa ku 94 W, mphamvu yotulutsa mphamvu yowonjezera inawonjezeka kufika pa 22.33 W, ndipo pulse m'lifupi inali 394 fs ndipo mphamvu imodzi yokha inali 0.28 μJ.

Kuonjezera kuonjezera mphamvu linanena bungwe, gulu kafukufuku kuonjezera kupindika utali wozungulira wa lolunjika concave galasi awiri, ndi kuika resonator mu otsika vacuum chatsekedwa chilengedwe kuchepetsa chikoka cha chisokonezo mpweya ndi mpweya kubalalitsidwa.