Laser pepa paʻa ke ʻano, laser ultrafast ikaika kiʻekiʻe

Femtosecond mana kiʻekiʻelaserLoaʻa ka waiwai noi nui i ka noiʻi ʻepekema a me nā ʻoihana ʻoihana e like me ka terahertz generation, attosecond pulse generation a me ka optical frequency comb.Nā lasers paʻa mode pili ana i ka media block-gain kahiko i kaupalena ʻia e ka hopena lens lens ma ka mana kiʻekiʻe, a i kēia manawa ʻo ka mana hoʻopuka kiʻekiʻe ma kahi o 20 W.

Hoʻohana ka laser pepa lahilahi i ke ʻano o ka pauma multi-pass e hōʻike i kakukui pailai ka lau me ka mānoanoa o 100 microns no ke kiʻekiʻe o ka hana ʻana i ka pauma. ʻO ka ʻenehana loaʻa lahilahi loa i hui pū ʻia me ka ʻenehana backcooling e hoʻemi nui i ka mana o ka hopena lens thermal a me ka hopena nonlinear, a hiki ke hoʻokō i ka mana kiʻekiʻe o ka mana femtosecond pulse output.
ʻO nā oscillators Wafer i hui pū ʻia me Kerr lens mode-locking technology ke kumu nui e loaʻa ai ka mana kiʻekiʻe kiʻekiʻe o ka mana laser me ka laulā pulse i ke kauoha o femtosecond.

FIG. 1 (a) 72 kiʻi hoʻolālā ʻike a me (b) kiʻi kino o ka module pamu

Ua hoʻolālā a kūkulu ʻia kahi pūʻulu o nā mea noiʻi mai ka Chinese Academy of Sciences i kahi lens lens mode-locked sheet laser ma muli o ka module pump 72-way i hoʻomohala ponoʻī ʻia, a ua hoʻomohala i kahi laser lens lens mode-locked sheet laser me ka mana awelika kiʻekiʻe. ikehu pulse ma Kina.
Ma muli o ke kumu o Kerr lens mode-locking a me ka helu ʻana o ka ABCD matrix, ua ʻimi mua ka hui noiʻi i ka manaʻo paʻa paʻa ʻana o ka pā aniani ʻo Kerr lens mode-locking laser. a me ka hana mau, a ua hōʻoia ʻia e hoʻemi ʻia ka radius mode cavity ma ka diaphragm paʻakikī ma mua o 7% ma hope o ka paʻa ʻana.

Ma hope iho, alakaʻi ʻia e ka manaʻo hoʻolālā, ua hoʻolālā ka hui noiʻi a kūkulu i kahi resonator i hoʻopaʻa ʻia ʻo Kerr lens mode-locked resonator (FIG. 2) ma muli o ka 72-way pump module (FIG.1) i hoʻomohala kūʻokoʻa e ka hui, a loaʻa iā ia kahi laser pulsed puka me ka mana awelika o 11.78W, he pulse laula o 245 fs a me ka ikehu pulse hookahi o 0.14μJ ma 72 W manawa pumping. ʻO ka laulā o ka pulse puka a me ka hoʻololi ʻana o ke ʻano intracavity i ʻaelike maikaʻi me nā hopena simulation.

FIG. 2 Kiʻi kiʻi kiʻi o ka lua resonant o ka Kerr lens mode-locked Yb: YAG wafer laser i hoʻohana ʻia i ka hoʻokolohua.

I mea e hoʻomaikaʻi ai i ka mana hoʻopuka o ka laser, ua hoʻonui ka hui noiʻi i ka curvature radius o ke aniani nānā, a hoʻoponopono maikaʻi i ka mānoanoa waena Kerr a me ka hoʻopuehu ʻana o ka lua. I ka manawa i hoʻonoho ʻia ai ka mana pāpaʻi i 94 W, ua hoʻonui ʻia ka mana hoʻopuka awelika i 22.33 W, a ʻo ka laula pulse he 394 fs a ʻo ka ikehu pulse hoʻokahi he 0.28 μJ.

No ka hoʻonui hou ʻana i ka mana hoʻopuka, e hoʻonui hou ka hui noiʻi i ka radius curvature o ke aniani concave i hoʻopaʻa ʻia, ʻoiai ke kau ʻana i ka resonator i kahi wahi haʻahaʻa i pani ʻia e hōʻemi i ka mana o ka haunaele o ka ea a me ka hoʻopuehu ʻana o ka ea.