Gupima ubugari bw'umurongo wa laser y'ubugari bw'umurongo muto

Igipimo cy'ubugari bw'umurongolaser ifite ubugari bw'umurongo muto

Ubugari bw'umurongo wa laser ifite ubugari buciriritse, cyane cyane ubw'amasasu ya laser afite frequency imwe, bwerekeza ku bugari bwa spectrum ya laser (ubusanzwe ni igice cy'ubugari kugeza kuri FWHM yuzuye). Mu by'ukuri, ubugari bw'ubucucike bw'imbaraga za spectral z'amashanyarazi atangwa bugaragazwa hakurikijwe frequency, wavenume cyangwa uburebure bw'uburebure. Ubugari bw'umurongo wa laser bufite isano rya hafi cyane n'igihe kandi burangwa n'igihe cyo guhuza n'uburebure bw'imikoranire. Iyo urwego runyuze mu mpinduka idafite imipaka, urusaku rw'igice rutanga ubugari bw'umurongo, nk'uko bimeze kuri oscillator yigenga. Ihindagurika ry'igice rigizwe n'urwego ruto cyane rw'igice rituma habaho ubugari bw'umurongo 0 n'urusaku ku ruhande. Guhuza uburebure bw'aho utuye nabyo bigira uruhare ku bugari bw'umurongo kandi bigatuma bushingira ku gihe cyo gupima. Ibi bigaragaza ko ubugari bw'umurongo gusa cyangwa imiterere ya spectrum (ubwoko bw'umurongo) bidashobora gutanga amakuru yose yerekeyespectrum ya laser.

Uburyo bwinshi bushobora gukoreshwa mu gupimaubugari bw'umurongo wa laser:

Iyo igipimo cy'ubugari bw'umurongo ari kinini (> 10GHz, iyo hari ukuzunguruka kwa mode nyinshi mu cyuho cya resonant cya laser nyinshi), spectrometer isanzwe ikoresha agace ka diffraction irashobora gukoreshwa mu gupima. Biragoye cyane kubona resolution ya frequency yo hejuru ukoresheje ubu buryo.

Ubundi buryo ni ugukoresha icyuma gipima inshuro nyinshi kugira ngo gihindure impinduka z’impinduka z’impinduka mu mpinduka z’ubukana. Iki gipimo gishobora kuba interferometero idahuje cyangwa icyuma gipima neza cyane. Uburyo bwo gupima ubu buryo nabwo ni buke cyane.

3. Imashini zikoresha umurongo umwe w’ingufu zikoresha uburyo bwa "self-heterodyne", bufata umurongo uri hagati y’ingufu zikoreshwa na laser ubwayo nyuma yo gusibanganya no gutinda.

Iyo ubugari bw'umurongo ari Hezite magana menshi, tekiniki gakondo ya heterodyne ntabwo ikora kuko uburebure bunini bwo gutinda bukenewe muri iki gihe. Umuzunguruko w'urukiramende rw'imizingo n'icyuma gitera imbaraga imbere mu miyoboro y'imizingo birashobora gukoreshwa kugira ngo byongere.

5. Ubushobozi bwo gufata neza cyane bushobora kugerwaho hakoreshejwe uburyo bwo gufata amajwi y'ama-laser abiri yigenga. Muri iki gihe, urusaku rwa laser y'icyitegererezo ni ruke cyane ugereranyije n'urw'ikizaminilaser, cyangwa ibimenyetso by'imikorere y'ibyo byombi bisa. Itandukaniro ry'inshuro zihita rishobora kuboneka hakoreshejwe uruziga rufunganye cyangwa binyuze mu kubara hashingiwe ku nyandiko z'imibare. Ubu buryo bworoshye cyane kandi buhamye, ariko busaba indi laser (ikora hafi y'inshuro ya laser yo gupima). Niba ubugari bw'umurongo wapimwe busaba intera nini cyane ya spectral, biroroshye cyane gukoresha frequencing comb.

Gupima inshuro z'urumuri rw'amajwi akenshi bisaba ikigereranyo runaka (cyangwa igihe) mu gihe runaka. Kuri laser ifite ubugari buto, hakenewe urumuri rumwe gusa kugira ngo habeho ikigereranyo gikwiye. Uburyo bwa heterodyne bubona ikigereranyo cy'inshuro hakoreshejwe gutinda igihe gihagije kuva ku gikoresho cyo gupima ubwacyo. Byaba byiza, birinda guhuza igihe hagati y'urumuri rw'ibanze n'urumuri rwayo rwatinze. Kubwibyo, imigozi miremire y'amajwi ikunze gukoreshwa. Ariko, bitewe n'ihindagurika rihoraho n'ingaruka z'amajwi, imigozi miremire y'amajwi ishobora gutera urusaku rw'inyongera.