M25 monochromator

M25

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M25 Monochromator

Stray light caused by multiple diffraction cannot be avoided with the use of the general Czerny-Turner mount system, but our unique asymmetrical modified Czerny-Turner optical arrangement developed for this M25 monochromator can eliminates this stray light. M25 has designed compact, lightweight and bright with high resolution. Since the optical adjustment is performed so that a waveform with good symmetry can be obtained near the blaze wavelength of the diffraction grating, good resolution is maintained at both ends of measurement wavelengths.

catalog（PDF）

Features

The optical layout employ the unique asymmetrical modified Czerny-Turner mount has reduced the stray light significantly that is caused by multiple diffraciton.

Our optical system which has been designed to show very little aberration can provide spectra with excellent symmetry over every wavalength.

Exchange of diffraction grating is easily done with maintaining good reproducibility (within±0.1nm) so that this monochromator can be used to cover broad band (200nm～25µm)

Nitrogen purge mechanism allows the M25 to be used in the infrared region.

Adopting the diffraction grating which has the broad effective area, the optical system is bright with F=4.3, and exhibits very less aberrations so that the symmetry of the emited light is superior ever each wavelength and higher resolution can be obtained.

Since machanism and overation are robust and easy, the M25 is strong to shock and vibration. The model M25 is capable of high-precision measurement with almost no backlash of the slit mechanism.

Since the entrance slit is arranged on the opposite to the exit silt, the M25 is easy to be configured with other optical systems and special accessories to meet your specific requirements.

Mounting the stepping motor wavelength drive(option), it is possible to control the M25 through anxeternal pulse signal and GP-IB.

Specifications (when 1200 lines/mm grating is used)

Optical system	Asymmetrical modified Czerny-Turner mount
Focal length	250ｍm
Aperture ration	F=4.3
Diffraction grating	Ruled effective area 52×52mm
Optical wavelength range	200～1400nm
Mechanical wavelength range	0～1400nm
Resolution	0.1nm（FWHM）
Wavelength scanning method	Sine bar mechanism, Wavelength linear scanning
Wavelength driving method(Option)	Stepping motor drive
Wavelength accuracy	±0.1nm（setting from forward direction）
Wavelength display	Conter display, minimum 1nm、minimum scale 0.1nm
Wavelength reprofucibility	±0.1nm（Setting from forward direcition）
Stray light	≦1×10^-4（under confitions that when λ₀is546.1nm, λ₀is ±5nm)
Entrance slit	Width : 0～4mm（symmetry continuously variable, minimum read scale 0.01mm）
Filtter	Manual slide method(6 pcs of filter can be installed) *Filter for Ultra violet and infra red are options

Standard Configration

●Main unit (without a grating)
●Visible filter(L-37, R-64)
●Slide type film holder
●Slide height V shape iris
●Instruction manual

Gratings Lineup

Grooves number	Blaze wavelength	Reciprocal linear dispersion
1800 g/mm	250,500nm	2.2nm/mm
1200 g/mm	200,300,400,500,750nm, 1.0,1.2,1.6μm	3.2nm/mm
600 g/mm	200,300,500,750nm,1.0,1.2,1.6μm	6.4nm/mm
400 g/mm	400,550,850nm, 1.6µm	9.6nm/mm
300 g/mm	300,500,760nm,1.0,1.7,2.0,3.0,4.0μm	12.8nm/mm
150 g/mm	500,800nm,1.25,2.0,3.0,4.0,6.0,8.0μm	25.6nm/mm
120 g/mm	3.75,8.3μm	32nm/mm
60g /mm	16μm	64nm/mm

*The above gratings are options. Please specify any grating. And for any other grating, please contact us.

*Reciprocal liner dispersion depends on WL.

Optical System

●High order cut filter (Ultraviolet ～ Infrared)
●Replacement Diffraction Gratings (with holder)
●BMS-25C Wavelength scanner (with a stepping motor drive, GP-IB Interface)
●BSMD-25C Wavelength drive system (with a stepping motor drive wavelength marker)
●Various light source, optical system, detector

Dimensions and weight

●Dimensions: approx. W360×D330×H215ｍｍ
●Weight: approx.20kg