venteon optics
Optics designed for ultra-short pulses
• Group Delay Dispersion (GDD) compensation mirrors
• Enhanced silver mirrors
• CaF2 and fused silica glass wedge pairs
• Designed specifically for few-cycle pulse management
Overview
Laser Quantum’s venteon optics range of mirrors and wedges are designed specifically for beam path control and Group Delay Dispersion compensation of few-cycle laser pulses.
DCM mirror pairs
Choosing the right mirrors
The DCM mirrors are all manufactured to the same high quality specifications, however, each mirror is suited to a different application dependent on compensation vs. wavelength. See Fig. 1 to choose the correct mirrors for your research.
Fig. 1 DCM mirror wavelength and compression performance and image of DCM mirrors
The DCM products are dispersion compensating mirror pairs used for the compensation of positive dispersion affecting femtosecond laser pulses (Fig. 2 to 13). The unique design enables reflectivity greater than 99% over the whole supported spectral bandwidth next to a defined negative dispersion. Using these mirrors in a pulse compressor in combination with CaF2 wedges pair/glass material it is possible to compress the pulses nearly to the supported transform limit according to the lasers spectral bandwidth.
Compared to other methods used for GDD compensation, the use of high damagethreshold DCM mirrors results in a compact and robust designs for ultra-short pulse laser oscillators or compressor setups with octave-spanning spectral bandwidth. This can be achieved with a minimum of optical components and without complex and often narrowband and inefficient prism or grating sequences.
Enhanced silver mirrors
This protected silver mirror is enhanced for femtosecond applications and tested for sub-5 fs pulses. It features an average reflectivity of more than 99% between 620 nm and 1110 nm (0-45°) (Fig. 15) and a tailored flat dispersion characteristic in this range (Fig. 14). The enhanced silver mirror “blue” is optimized for shorter wavelengths and offers a reflectivity of more than 97% between 450 nm and 950 nm. Both mirror types will give you more freedom in designing your experimental setup.
DCM7
GDD-mirror
pair
DCM9
GDD-mirror
pair
DCM10
GDD-mirror
pair
DCM11
GDD-mirror
pair
DCM12
GDD-mirror
pair
CM-2
GDD-mirror
(set of 2)
Enhanced
silver mirror
(single)
Enhanced
silver mirror
“blue”
(single)
Wavelength range (nm)
600-1200
450-950
500-825
650-1050
400-680
740-940
550-1500
450-1300
Reflectivity/pair (%) HR within wavelength range
>99.2
>99.2
>99.2
>99.5
>99.2
>99.6
>99@620-1110 nm
>97@450-950 nm
Reflectivity (Side 2) AR
515-532 nm
n/a
n/a
n/a
n/a
n/a
n/a
n/a
GDD/pair
-120 fs2@800nm
-55 fs2@700 nm
-100 fs2@650 nm
-120 fs2@850 nm
-80 fs2@550 nm
-220 fs2@800 nm
< ±12 fs2
< ±12 fs2
Target design
4.4 mm CaF2
1.2 mm FS
2.0 mm FS
1.8 mm BBO
1.3 mm FS
6 mm FS
n/a
n/a
Dimensions
35 x 20 mm : 10 mm thickness
1/2” or 25 mm diameter6.35 mm thick
25 mm diameter6.35 mm thick
Damage threshold
0.05 J/cm²
0.15 J/cm²
ROC
Flat, residual ROC of > 250 m possible
AOI
0-10°
0-45°
Substrate
Fused Silica
Surface quality1
3/0.2 (all Ø10 within 28x16); 5/3x0.063 (Øe 33x16)
1 According to ISO 10110
Beam splitter with balanced dispersion
Wavelength range:
600 - 1500 nm
Substrate:
Fused silica substrate
Split ratio:
50%±5%
Dimensions:
Diameter 1”; 0.7 mm thickness
Glass wedges for dispersion fine tuning
The glass wedge pairs allow for dispersion fine tuning and optimal pulse compression in combination with dispersion compensating mirrors. The dispersion characteristics of the DCM mirrors are especially designed to work together with specific glass materials and thus such a wedge pair can be used to fine-tune the dispersion and compress pulses for the desired application.
Calcium fluoride
Fused silica
Centre thickness
1.4 mm
1.4 mm
2.0 mm
Dimensions
35 x 20 mm
35 x 20 mm
50 x 25 mm
Wedge angle
4°
4°
Surface Quality
<lambda/6, S/D<60-40
<lambda/10
<lambda/4
For use with
DCM7
DCM9, DCM10, DCM12
Bandwidth
300 - 1500 nm, uncoated for use under Brewster angle
Specialised mirror/optics mounts
Rectangular optics mount
This special optics mount accepts rectangular optics/mirrors with a height of 20 mm and can be directly mounted into standard 1” round mirror mounts. The slim design without sideframe is ideally suited to build up compressor beam lines using rectangular mirrors with multi-bounces.
Wedge mounting adapter pair
This pair of wedge mounting adapters is designed to accept up to 4 mm thick glass wedges, as provided by Laser Quantum, to allow dispersion fine tuning in a pulse compression setup. One of the adapters can be directly screwed onto M4 threaded pedestal posts whereas the other features a 20 mm grid for M2 screws to allow for a direct mounting onto standard compact translation stages that can be ordered optionally. The design of these adapters allows for a minimal gap between the wedges to minimise dispersive effects.
Rectangular optics mount
Wedge mounting adapter pair
Accepts rectangular optics with a height of 20 mm
Accepts glass wedges and optics up to 4 mm thickness
No width limitation of the optics
No width limitations (open frame design)
Directly compatible to standard 1” mirror mounts
Optimised design for mounting two wedges with minimal gap between each other and gentle glass clamping due to rubber sheets
Aperture in backplane for leakage or transmitted radiation
M4 thread for direct pedestal mounting (one adapter). Mounting holes (M2-grid) for direct translation stage mounting (one adapter)
High quality aluminium alloy, anodised or with vibrationgrounded finish
Translation stage with 6.5 mm travel can be ordered optional with an additional adapter for pedestal mounting below the translation stage
Monolithic periscope
The monolithic periscope is designed to realise a broadband polarisation rotation or beam offset within a minimal space and highest stability due to the use of non-adjustable mirror mounts. It is ideally suited to rotate from p-polarisation to s-polarisation, e.g. for parametric phase matching. The design allows for easy height adjustments of the mirror mounts/sliders for quick adaptation to the optical beam path.
Monolithic periscope
Three different mirror mounts (sliders) included to realise different periscope and beam steering options
Polarisation rotating (90˚) or non-rotating (0˚) beam offset possible
Mirror mounts accept 0.5” optics
Adapters for 1” optics available
M4 threaded for direct pedestal post mounting
Minimal beam height: 1.5” (using 0.5” pedestal post mounting)
Minimal beam offset (input - output): 15 mm
Maximal beam offset (input - output: 55 mm
Monolithic stainless steel body
Choice of mirrors (sold separately) available