Features

Dichroic Mirror with Longpass Characteristics
High Transmission and Reflectivity with Flat Response
and Sharp Cut-Off Edges
3 Sizes Available: Ø1", Ø2", or 25 mm x 36 mm
Fused-Silica Substrate with Ultra-Low Autofluorescence
Hard Dielectric Glass Coating for Easy Handling and Cleaning with Negligible Degradation or Burn Out
Resistant to Damage from UV Light and Chemicals
Dichroic Surface is Indicated

Typical Applications

Fluorescence Microscopy
Combining Two Beams of Different Wavelengths
Splitting Two Beams of Different Wavelengths
Filtering of Spectral Components
Laser Applications that Require Minimal Wavefront Distortion

The DMLP Series of Dichroic Mirrors / Beamsplitters are designed for use with an angle of incidence of 45° and are available in three sizes: Ø1", Ø2", and 25 mm x 36 mm. Each mirror is designed so that it transmits / reflects 50% of the incident beam at its design wavelength. Below the design wavelength is a spectral band over which the optic will reflect more than 90% of the incident light while above the design wavelength is a spectral band for which the optic will transmit more than 90% of the incident light. This allows the optic to be used to combine two separate beams: one with a wavelength(s) shorter than the design wavelength and another with a wavelength(s) longer than the design wavelength without significant intensity losses to either beam. Alternatively, overlapping beams can be split using the same optic. Dichroic mirrors of this type are frequently used in fluorescence microscopy where the light used to excite the sample is focused onto the sample with the same objective lens that is used to collect the light emitted by the sample.

Application

The figure above depicts the optic being used to combining a beam having a wavelength from the transmission band (red) with a beam having a wavelength from the reflection band (blue). If the direction of propagation is reversed for the two beams, the optic would split the two beams. In either case, the dichroic mirrors / beamsplitters differ from a typical beamsplitter in that the beams are combined or separated without a large loss in the intensity of either beam.

High Surface Quality and Durability

These filters are fabricated from a hard-coated ion-beam-sputtered thin coating that is placed on a simple ultra-low-autofluorescence fused-silica substrate without using any adhesives. The dielectric glass coatings are as hard as the glass substrate itself with a scratch-dig of 40-20. Additionally, they are virtually impervious to humidity-induced shifting. The uniformity and high flatness of the coated glass avoids unwanted wavefront distortions. The filters can be cleaned and handled like standard glass optics. They withstand high optical irradiation intensities with no noticeable degradation or burn out, even with prolonged use and exposure to ultraviolet light.

Item #	DMLP425	DMLP505	DMLP567	DMLP605	DMLP638	DMLP900
Longpass Cutoff (50%)*	425 nm	505 nm	567 nm	605 nm	638 nm	900 nm
Reflection Band	380 - 410 nm	380 - 490 nm	380 - 550 nm	470 - 590 nm	580 - 621 nm	400 - 872 nm
Transmission Band	440 - 700 nm	520 - 700 nm	584 - 700 nm	620 - 700 nm	655 - 700 nm	932 - 1300 nm
Substrate Material	UV Fused Silica
Ø1" Optics
Diameter	25.4 mm
Clear Aperture	Ø23.0 mm
Thickness	3.2 mm
Ø2" Optics (L-Series)
Diameter	50.8 mm
Clear Aperture	Ø48.0 mm
Thickness	5.0 mm
Square Optics (R-Series)
Dimensions	25.0 mm x 36.0 mm
Clear Aperture	23.0 mm x 33.0 mm
Thickness	3.0 mm
Common Features
Wavefront Distortion	< λ/4 @ 632 nm over complete aperture
Incidence Angle	45°
Scratch-Dig	40 - 20
Back Side AR Coating	400 - 700 nm, R < 2 %					932 - 1300 nm, R < 2 %
Operating Temperature	-50 to 80 °C

*Longpass Cuttoff (50%) This is the wavelength between reflection and transmission band at which a transmission of 50% is achieved.

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Posted Comments:
Poster: Adam	Posted Date: 2010-05-14 08:19:58.0
A response from Adam at Thorlabs to Sheehy: We currently do not damage threshold information for these mirrors. We can send these out for testing but would like to contact you first. We would like to know the powers you are using and the wavelengths that would be of interest.

Poster: sheehy	Posted Date: 2010-05-13 15:05:16.0
it would be useful to know optical damage thresholds for these dichroic mirrors

Poster: klee	Posted Date: 2009-09-08 17:09:55.0
A response from Ken at Thorlabs to jorge: Thank you for your valuable feedback. Your suggestion has been forwarded to our optics division.

Poster: jorge	Posted Date: 2009-09-04 09:15:20.0
Dichroic beamsplitters, both 0 and 45 degrees, with 900nm cut-off wavelength would be very useful for those who work with diode lasers together with Nd:YAG lasers (reflection band of, for instance, 400-900nm, transmission band 900-1300nm, and viceversa). Thanks for your attention.