Tshiab Ultra-tsawg Frequency Raman Lim Nta thiab Cov Ntawv Thov

Tshiab Ultra-Qis Frequency Raman Cov Ntxaij Ntaus thiab Daim Ntaub Ntawv - Tsim nyog rau Ultra-tsawg Wavenumber Raman Spectroscopy Ntsuas

Abstract: Nyob rau ntau qhov kev tshawb fawb ntawm kev tshawb fawb, Raman qis yog qhov tseem ceeb ntawm qhov kev ntsuas analytical. Lub Bragg Thais Ntaus Lim yog lim Raman cim rau ultralow-wavelength Raman spectroscopy. Nws tuaj yeem ua tiav Raman ntsuas txog li 10cm-1. Nws yog dav siv nyob rau hauv Raman ultra-tsawg zaus. Spectrometers, yog li ntawd, xws li tej kab zauv Raman lim kuj muaj lub npe hu ua Raman lim dej uas tsis zoo.

Ultra Tsawg Zaus Raman Lim yog lub Raman lim uas yog dav siv hauv qis-ntev ntu Raman spectroscopy. Nws muaj peev xwm ncav tau Raman spectroscopy ntsuas hauv qab 10cm-1. Shanghai Quanliang Optoelectronics yog tus neeg sawv cev ntawm cov khoom no.

Ultra-low-frequency Raman filter (ULF) yog ib qho yeeb yaj kiab yees duab-rhiab iav (PTR), uas yog ua los ntawm UV cuam tshuam rau kev cuam tshuam. Nws muaj peb qho ultra-nqhiab thaij lim dej. Nws yog li ntawm 1 ~ 2 nqaim lim dej lim (Bandpass Filter). Ob qho tib si Muaj Bragg band-notch lim (BNF) thiab ntau Thaj Bragg bandpass lim (BPF) muaj rau tib lub ntim Bragg grating thiab lawv tag nrho ua si tseem ceeb hauv kev ntsuas ntawm qis-wavelength Raman spectroscopy. Raman lim dej ultra-tsawg zaus (ULF) muaj lwm cov nta uas nyob deb tshaj li tus qauv Raman lim xws li:

• Txo tsawg zaus Raman ntsuas mus rau 5cm-1 (spectrometer ib-theem)

 Stokes thiab kev ruaj khov hauv Raman tuaj yeem ntsuas tau ib txhij;

 Muaj kev ruaj ntseg ib puag ncig zoo, pub dawb los ntawm av noo;

 Tsis muaj tus cwj pwm tsis txaus ntseeg;

 tuaj yeem tiv taus 400 siab kub;

Raman spectroscopy ultra-low tsuas yog siv cov Bragg bandpass lim (BPF) thiab Bragg nqaim band-notch lim (BNF) ob hom ntawm cov khoom faib, raws li nram no peb kawm ntxiv txog lawv cov yeeb yam:

(1) Prague Bandpass Lim (BPF)

Lub Bragg bandpass lim (BPF) yog siv rau kab dav tu ntawm qhov teeb meem laser kom tshem tawm lub suab nrov spectral ntawm lub laser thiab xyuas kom meej tias ib tug zoo laser beam yuav tau. Txuj kev hloov cov khoom siv dav hlau muaj peev xwm tshaj li ntawm 200-300cm-1, thiaj li nrov suab nrov tshaj 200cm-1 yuav cuam tshuam ultralow zaus zaus Raman spectroscopy. Peb Bragg bandpass lim (BPF) bandwidth (FWHM) yuav ua tau tsawg li 5cm-1, nws yuav tshem tawm lub suab nrov laser mus rau 5cm-1, thiab cov kev txhais tua tau mus txog -70dB.

Txheem wavelengths: 488nm, 514nm, 532nm, 633nm, 785nm, thiab 1064nm (customized wavelengths: 405nm, 442nm, 458nm, 473nm, 477nm, 491nm, 502nm, 561nm, 660nm, 840nm, 1352nm, 1550nm, thiab lwm yam)

 Bandwidth (FWHM) yog tsawg dua 7cm-1;

Lub Reflectance:> 90%;

 Standard size: 5mm x 5mm (loj loj tuaj yeem ua kevcai);

Nyob ze rau ntawm qhov nqaj nqus;

 Deflection angle: 20deg;

Daim ntaub ntawv: Lub caij nyoog tsawg zaus (Tawm) Raman spectrometer, nqaj lim piam thiab nrov suab nrov, semiconductor Raman teeb ci ASE lim dej;

(2) Bragg Lim (BNF)

Lub Bragg Lim (BNF) tau sim ib ntus ntsuas Stokes thiab tiv thaiv Stokes Raman bands mus rau 5 cm-1 thiab ua tiav ib qhov kev sib kis ntawm 95%. Qhov nqiam-qhab cov xim lim dej kuj xav kom los siav Bragg txoj kev xav. Rau BNF nrog attenuated OD3, lub kaum sab xis deflection yog 12 nti, thiab FWHM txais qhov kaum sab xis yog 6 mrad (hais txog 0.3 dej). Tam sim no, kev ntsuas ntawm ultra-tsawg zaus Raman spectra feem ntau tau siv peb lub lim dej ultra-tsawg Raman (ULF).

Txheem wavelengths: 488nm, 514nm, 532nm, 633nm, 785nm, thiab 1064nm (customized wavelengths: 405nm, 442nm, 458nm, 473nm, 477nm, 491nm, 502nm, 561nm, 660nm, 840nm, 1352nm, 1550nm, thiab lwm yam)

 Spectral Bandwidth (FWHM): 5 ~ 8cm-1;

 tus nqi qis: OD3 lossis OD4;

 Standard size: 11mm x 11mm, 12.5mm x 12.5mm (1 nti Mount);

 Deflection angle: 12 deg;