FemtoOptics™ Wedges for Dispersion Tuning

The FemtoOptics Dispersion Wedge family offers two size choices to fine tune dispersion in an ultrafast optical system. Designed for a very broad wavelength range at near normal angle of incidence, two identical wedges can be used to compensate for dispersion and angular deviation. Pairs of ultrathin wedges allow fine, continuous tuning of GDD. These thin glass wedges can also be used for rough tuning of the Carrier Envelope Phase (CEP).

Dispersion fine tuning over a wide dynamic range
Broadband antireflection coating applied to front and back surfaces
Ultrathin, small wedge angle 2.8 or 8 degrees
Large GDD tuning range
30x20 or 50x20 mm sizes

See All Features

Description	Compatibility	Size	Material	Antireflection Coating	Surface Quality	Avail.	Price
23RQ12-02Dispersion Wedge, FemtoOptics, 20 x 30 mm, 0.2 mm thick, Fused Silica, Uncoated	UNIVERSAL	20 x 30 mm	Fused Silica	Uncoated	10-5 scratch-dig	6 Weeks	$424
23RQ12-02-MDispersion Wedge, Mounted, 20x30 mm, 0.2 mm thick, Fused Silica, Uncoated, FemtoOptics	UNIVERSAL	20 x 30 mm	Fused Silica	Uncoated	10-5 scratch-dig	In Stock	$571
25RB12-01UF.AR2Dispersion Wedge, FemtoOptics, 20 x 50 mm, 0.5 mm thick, N-BK7, AR Coated	UNIVERSAL	20 x 50 mm	N-BK7	R<0.5% 650-1040 nm, AOI=0-8°	10-5 scratch-dig	In Stock	$809
25RB12-01UF.AR2-MDispersion Wedge, Mounted, 20x50 mm, 0.5 mm thick, N-BK7, AR Coated, FemtoOptics	UNIVERSAL	20 x 50 mm	N-BK7	R<0.5% 650-1040 nm, AOI=0-8°	10-5 scratch-dig	In Stock	$922

Specifications

Models
Size	20 x 30 mm	20 x 50 mm
Material	Fused Silica	N-BK7
Antireflection Coating	Uncoated	R<0.5% 650-1040 nm, AOI=0-8°
Surface Quality	10-5 scratch-dig	10-5 scratch-dig
Surface Flatness	λ/6 at 633 nm	λ/6 at 633 nm
Clear Aperture	19.5 x 29.5 mm	19 x 47 mm
Cleaning	See How to Clean Optics	See How to Clean Optics

Notes:

The -M models include a mounted adapter that fits into any standard 1- or 0.5-in. mirror or lens holder

Features

Fine Tune Dispersion Over a Wide Dynamic Range

Because of the relatively small angle and large length of these optical wedges, dispersion can be finely tuned over a wide dynamic range. By using a pair of wedges, angular dispersion can be avoided. Popular applications include high harmonic generation, attosecond pulse generation, CEP (Carrier Envelope Phase) or applications using wedges in conjunction with high dispersion mirrors.

Pairs of ultra thin wedges allow fine, continuous tuning of the GDD. The extremely accurate GDD control enabled by thin glass wedges in conjunction with is indispensable for the generation and manipulation of sub-10 femtosecond pulses.

Special care and attention should be taken when handling these ultrathin optics. Any small mishap may bring irreparable harm to the wedge. Handle at your own risk.

Mounted Wedges Setup Example

The Mounted Wedges Setup is a precision optical system designed for fine dispersion and Carrier Envelope Phase (CEP) tuning in ultrafast laser applications. Using ultrathin glass wedge pairs with broadband antireflection coatings, this setup enables continuous group delay dispersion (GDD) control over a wide dynamic range. Available in two wedge angles and sizes, the system integrates seamlessly into standard optical mounts for compact and stable alignment. Please see our Dual Wedge Fine GDD and CEP Tuning application set-up page for the complete parts list.

Typical GDD for 23RQ12-02

Typical GDD vs material insertion for the 20 x 30 mm ultra thin wedges with 2° 48' wedge angle.

Typical GDD for 25RB12-01UF.AR2

Typical GDD vs material insertion for the 20 x 50 mm ultra thin wedges with 8° wedge angle.

Easy Mounting for Mounted Version

The mounted versions of the wedges fit easily into Newport's 1- or 0.5-in. diameter mirror mounts or lens holders. The wedges are offered with or without coating. A broadband antireflection coating minimizes insertion losses at near normal incidences. Additional insertion losses can be minimized using the wedges at Brewster's angle. The mounting example seen includes the 25RB12-01UF.AR2-M optical wedge in the Ultima Mirror Mount.