Dichroic Mirrors (Wavelength & Harmonic Separators and Combiners)
Dichroic mirror: Wavelength or harmonic separator or combiner. Short and long pass options. Separates or combines wavelengths. Price and Specifications.
Estimated Shipping Date: January 27, 2026 - February 10, 2026
* - Shopping cart pricing is based on the most recent pricing and it is NOT ORDERING, but requesting an official quotation which should typically reach You within 1-2 business days.
- Description
- Applications
- Characteristics
- Types
- FAQ
Dichroic Mirrors (Wavelength Separators): Function and advantages
What is the main function of a Dichroic Mirror?
A dichroic mirror separates two wavelength bands by transmitting one and reflecting the other at a defined angle of incidence; the same principle can be used in reverse to combine beams of different wavelengths.
Advantages of Alien Photonics Dichroic Mirrors
- IBS or E-beam/IAD coating: High precision or economic options.
- UV to IR coverage (up to ~15 µm in some cases).
- Optimized for high reflection or high transmission at defined AOI
- High-LIDT options: coating materials selected for your laser wavelength and pulse regime.
Applications of Dichroic mirrors
Harmonic separation
Dichroic mirror separates harmonic wavelengths from the fundamental in frequency-converted lasers.
Pump-light injection (DPSS)
Placed near the gain medium to reflect pump light while transmitting the laser wavelength in diode-pumped solid-state resonators.
Pump and signal routing
Directs pump and signal beams in Ti:Sa, Yb:YAG and Nd:YAG systems without introducing excess loss.
Beam combining
Combines two wavelengths into a single optical path at a designed angle of incidence.
Fluorescence separation
Reflects the excitation beam and transmits the lower energy fluorescence signal in microscopy setups.
Raman spectroscopy
Separates pump and Raman-shifted wavelengths for spectral analysis.
Medical and biomedical filtering
Blocks unwanted wavelengths while passing the diagnostic or therapeutic band.
Tracer-beam extraction
Redirects a low-power tracer beam without attenuating the main laser.
Mid-IR separation
Separates transmission and reflection bands in mid-IR parametric stages (2–10 µm+).
Alternatives of Dichroic mirrors
PBS cube as an alternative
While you would need to change the whole setup to replace dichroic mirror with PBS cube, this is something to consider while designing laser.
What are the properties of a dichroic mirror?
Alien Photonics dichroic mirrors (wavelength separators) can be customized in the variety of aspects. Please, treat contents of this table as guidelines and contact us for custom solution.
Substrate specifications - polishing quality, flatness, others
| Parameter | Standard components | Custom Components |
|---|---|---|
| Substrate material | UVFS or N-BK7 | Various materials |
| Surface Form | Flat/Curved | Flat/Curved |
| Angle of Incidence (AOI) | 0° or 45° | Custom angles (e.g., 15°, 22.5°, 30°, 56°), angle range (±5°, 22.5°-45°, 45°-55°) |
| Flatness | λ/8~ λ/6 @ 632.8 nm | <λ/10 @ 632.8 nm |
| Surface quality | 20-10 S-D or 40-20 S-D | 10-5 S-D (acc. to MIL-PRF-13830B) |
| Dimension tolerances | ±0.1 mm | Custom |
| Chamfers (bevels) | 0.10-0.25 mm x 45° | Custom |
Coating characteristics - Transmission, Reflection, LIDT, others
| Coating Characteristics | Standard Coating | Custom Coating |
|---|---|---|
| Wavelength Range | Fundamental and harmonic wavelengths | UV (~180 nm) to IR (~15,000 nm) |
| Clear Aperture | >85% | Custom aperture |
| Reflection | R>99.0% or R>99.5% | Custom values available |
| Transmission | T>90.0% or T>99.0% | Custom values available |
| Laser Induced Damage Threshold (LIDT) | >5-10 J/cm² @ 1064 nm, 10 ns, 10 Hz | According to your laser parameters |
| AR Coating durability | acc. to MIL-C-675C | According to custom requirements |
Quality certificates: COC, RoHS, Conflict Minerals, others
| Certificate | Availability |
|---|---|
| Certificate of Conformance (CoC) | Available on request |
| RoHS compliance | Available on request |
| Conflict Minerals declaration | Available on request |
| REACH compliance | Available on request |
| LIDT certificate | Available via accredited partners, on request |
What are the different types of dichroic mirrors?
Harmonic Separators and combiners
Harmonic separator - a dichroic mirror, intentionally designed to separate harmonics of specific laser. Alien Photonics harmonic separators are usually designed specifically for 2 or 3 wavelengths. Generally used in solid state lasers to separate or combine laser harmonics.
Wavelength separators and combiners
Wavelength separators separate or combine different wavelengths (e.g. separate or combine guiding beam wavelength 632.8 nm from working beam wavelength 1064 nm).
Short pass dichroic mirror
A short-pass dichroic mirror transmits shorter wavelengths and reflects longer wavelengths, with a steep cut-off at the specified transition wavelength.
Long pass dichroic mirror
A long-pass dichroic mirror is designed to reflect the shorter band up to the specified cut-off wavelength, while transmitting the longer band at the defined angle of incidence.
Frequently Asked Questions - Price, Specifications & Delivery Time
What is the price of Dichroic Mirror?
Dichroic mirror price starts at 120 €. The price depends on
- coating technology and LIDT requirements
- spectral optimization (reflection or transmission)
- size and surface characteristics
- quantity (large batches - lower unit price)
What is the minimal order quantity?
Alien Photonics has no minimal order quantity, but we allways suggest to order optimal size batches.
What is the delivery time?
Dichroic mirrors from stock are shipped next day. Production could take from 2 weeks to 6 weeks. Very custom options might take 9-10 weeks.
What is LIDT of dichroic mirror?
Lower power options start from 5~8 J/cm² @ 1064 nm, 10 ns, 10 Hz, while higher LIDT options are >10 J/cm² @ 1064 nm, 10 ns, 10 Hz. Depens mostly on coating technology and coating materials.
Can you offer premium quality dichroic mirrors?
Yes, we can offer 10-5 scratch-dig and <λ/10 @ 632.8 nm custom dichroic mirrors.