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Thin BBO Crystal for Ultrafast Lasers

For frequency conversions of ultrafast lasers, one of the main concerns is pulse broadening induced by group velocity (Vg) mismatch between the input pulses and the generated pulse in an NLO crystal. In order to avoid pulse broadening, the  thickness of the crystal should not exceed the maximum length (Lmax) as defined by the pulsewidth divided by the inversed group velocity mismatch ( IGVM = ΔVg-1). The table below lists the Lmax for second harmonic generation (SHG) and sum frequency generation (SFG) of 10 fs pulses at the wavelength range of a Ti:Sapphire laser, the most popular ultrafast laser.    
 

Type I PM  in BBO Crystal

SHG @
700 nm

SHG @
800 nm

SHG @ 
900 nm

SFG @ 
700 nm + 350nm

SFG @
800 nm + 400 nm

SFG @
 900 nm + 450nm

IGVM (ps/cm)

2.72

1.92

1.40

8.50

5.68

4.08

Lmax @ 10fs (m)

40

50

70

10

18

25

A thickness of sub-100m (0.1mm) is desired for all the frequency conversion processes of 10fs pulses. In particular, crystals as thin as 10-20m may be needed for generation of very short UV wavelengths below 300nm.  

Newlight Photonics can provide BBO crystals as thin as 10m (0.01mm) for frequency conversions of very short pulses.

We also supply birefringent calcite plates and alpha-BBO plates for compensation of the temporal walkoff in nonlinear crystals (time delay compensators), please contact us for your requirements.

Standard Products

BBO for Second Harmonic Generation (SHG) of Ti Sapphire Lasers

Part No. Description In stock
BTC5001-SHG800(I)-P BBO crystal with the size 5 x 5 x 0.01mm, P-coating @ 400-800nm, for Type I SHG of λ centred @ 800 nm,  mounted in 1" anodized Al holder Email/Call
BTC5002-SHG800(I)-P BBO crystal with the size 5 x 5 x 0.02mm, P-coating @ 400-800nm, for Type I SHG of  λ centred @ 800 nm,  mounted in 1" anodized Al holder Email/Call
BTC5005-SHG800(I)-P BBO crystal with the size 5 x 5 x 0.05mm, P-coating @ 400-800nm, for Type I SHG of  λ centred @ 800 nm,  mounted in 1" anodized Al holder Yes
BTC5010-SHG800(I)-P BBO crystal with the size 5 x 5 x 0.1mm, P-coating @ 400-800nm, for Type I SHG of  λ centred @ 800 nm,  mounted in 1" anodized Al holder Email/Call
BTC5020-SHG800(I)-P  BBO crystal with the size 5 x 5 x 0.2mm, P-coating @ 400-800nm, for Type I SHG centred @ 800 nm,  mounted in 1" anodized Al holder Yes
BTC5050-SHG800(I)-P BBO crystal with the size 5 x 5 x 0.5mm, P-coating @ 400-800nm, for Type I SHG of  λ centred @ 800 nm,  mounted in 1" anodized Al holder Yes
$449
BTC5100-SHG800(I)-P BBO crystal with the size 5 x 5 x 1.0mm, P-coating @ 400-800nm,  for Type I SHG of  λ centred @ 800 nm,  mounted in 1" anodized Al holder Yes
$399
BTC5200-SHG800(I)-P BBO crystal with the size 5 x 5 x 2.0mm, P-coating @ 400-800nm, for Type I SHG of  λ centred @ 800 nm,  mounted in 1" anodized Al holder Yes
$399
BTC5300-SHG800(I)-P BBO crystal with the size 5 x 5 x 3.0 mm, P-coating @ 400-800nm, for Type I SHG of  λ centred @ 800 nm,  mounted in 1" anodized Al holder Yes
BTC10010-SHG800(I)-P BBO crystal with the size 10 x 10 x 0.1 mm, P-coating @ 400-800nm, for Type I SHG of  λ centred @ 800 nm,  mounted in 1" anodized Al holder Email/Call
BTC10020-SHG800(I)-P BBO crystal with the size 10 x 10 x 0.2 mm, P-coating @ 400-800nm, for Type I SHG of  λ centred @ 800 nm,  mounted in 1" anodized Al holder Email/Call
BTC10040-SHG800(I)-P BBO crystal with the size 10 x 10 x 0.4 mm, P-coating @ 400-800nm, for Type I SHG of  λ centred @ 800 nm,  mounted in 1" anodized Al holder Email/Call
BTC10050-SHG800(I)-P BBO crystal with the size 10 x 10 x 0.5 mm, P-coating @ 400-800nm, for Type I SHG of  λ centred @ 800 nm,  mounted in 1" anodized Al holder Email/Call
$829
BTC10100-SHG800(I)-P BBO crystal with the size 10 x 10 x 1.0 mm, P-coating @ 400-800nm, for Type I SHG of  λ centred @ 800 nm,  mounted in 1" anodized Al holder Email/Call
$799
BTC5050-SHG800(I)-AR BBO crystal with the size 5 x 5 x 0.5mm, AR@800/400nm, for Type I SHG of  λ centred @ 800 nm,  mounted in 1" anodized Al holder Yes
BTC5100-SHG800(I)-AR BBO crystal with the size 5 x 5 x 1.0mm, AR@800/400nm,  for Type I SHG of  λ centred @ 800 nm,  mounted in 1" anodized Al holder Yes
BTC5200-SHG800(I)-AR BBO crystal with the size 5 x 5 x 2.0mm, AR@800/400nm, for Type I SHG of  λ centred @ 800 nm,  mounted in 1" anodized Al holder Yes
BTC5300-SHG800(I)-AR BBO crystal with the size 5 x 5 x 3.0 mm, AR@800/400nm, for Type I SHG of  λ centred @ 800 nm,  mounted in 1" anodized Al holder Yes

BBO for Third Harmonic Generation (THG) of Ti Sapphire Lasers

Part No.

Description

In stock
BTC5010-THG800(II)-P BBO crystal with the size 5 x 5 x 0.1mm, P-coating, for Type II sum frequency mixing of λ centred @ 800 nm and λ/2 centred @ 400 nm to obtain λ/3  (THG),  mounted in 1" anodized Al holder Email/Call
BTC5020-THG800(II)-P  BBO crystal with the size 5 x 5 x 0.2mm, P-coating, for Type II sum frequency mixing of λ centred @ 800 nm and λ/2 centred @ 400 nm to obtain λ/3  (THG),  mounted in 1" anodized Al holder Email/Call
BTC5050-THG800(II)-P BBO crystal with the size 5 x 5 x 0.5mm, P-coating, for Type II sum frequency mixing of λ centred @ 800 nm and λ/2 centred @ 400 nm to obtain λ/3  (THG),  mounted in 1" anodized Al holder Email/Call
BTC5100-THG800(II)-P BBO crystal with the size 5 x 5 x 1.0mm, P-coating, for Type II sum frequency mixing of λ centred @ 800 nm and λ/2 centred @ 400 nm to obtain λ/3  (THG),  mounted in 1" anodized Al holder Email/Call
BTC5100-THG800(I)-P BBO crystal with the size 5 x 5 x 1.0mm, P-coating, for Type I sum frequency mixing of λ centred @ 800 nm and λ/2 centred @ 400 nm to obtain λ/3  (THG),  mounted in 1" anodized Al holder Yes
BTC10050-THG800(II)-P BBO crystal with the size 10 x 10 x 0.5mm, P-coating, for Type II sum frequency mixing of λ centred @ 800 nm and λ/2 centred @ 400 nm to obtain λ/3  (THG),  mounted in 1" anodized Al holder Email/Call
BTC10100-THG800(II)-P BBO crystal with the size 10 x 10 x 1.0mm, P-coating, for Type II sum frequency mixing of λ centred @ 800 nm and λ/2 centred @ 400 nm to obtain λ/3  (THG),  mounted in 1" anodized Al holder Email/Call
BTC5050-THG800(II)-AR BBO crystal with the size 5 x 5 x 0.5mm, AR@800/400/267nm,  for Type II sum frequency mixing of λ centred @ 800 nm and λ/2 centred @ 400 nm to obtain λ/3  (THG),  mounted in 1" anodized Al holder Yes
BTC5100-THG800(II)-AR BBO crystal with the size 5 x 5 x 1.0mm, AR@800/400/267nm,  for Type II sum frequency mixing of λ centred @ 800 nm and λ/2 centred @ 400 nm to obtain λ/3  (THG),  mounted in 1" anodized Al holder Email/Call
BTC5200-THG800(II)-AR BBO crystal with the size 5 x 5 x 2.0mm, AR@800/400/267nm, for Type II sum frequency mixing of λ centred @ 800 nm and λ/2 centred @ 400 nm to obtain λ/3  (THG),  mounted in 1" anodized Al holder Email/Call
BTC5300-THG800(II)-AR BBO crystal with the size 5 x 5 x 3.0 mm, AR@800/400/267nm, for Type II sum frequency mixing of λ centred @ 800 nm and λ/2 centred @ 400 nm to obtain λ/3  (THG),  mounted in 1" anodized Al holder Email/Call

BBO for Fourth Harmonic Generation (FHG) of Ti Sapphire Lasers

Part No. Description In stock
BTC5010-FHG800(I)-P BBO crystal with the size 5 x 5 x 0.1mm, P-coating, for Type I sum frequency mixing of λ centred @ 800 nm and λ/3 centred @ 266 nm to obtain λ/4 @ 200nm (FHG),  mounted in 1" anodized Al holder Email/Call
BTC5020-FHG800(I)-P  BBO crystal with the size 5 x 5 x 0.2mm, P-coating, for Type I sum frequency mixing of λ centred @ 800 nm and λ/3 centred @ 266 nm to obtain λ/4 @ 200nm (FHG),  mounted in 1" anodized Al holder Email/Call
BTC5050-FHG800(I)-P BBO crystal with the size 5 x 5 x 0.5mm, P-coating, for Type I sum frequency mixing of λ centred @ 800 nm and λ/3 centred @ 266 nm to obtain λ/4 @ 200nm (FHG),  mounted in 1" anodized Al holder Email/Call

BBO for Noncollinear Parametric Optical Amplifier (NOPA)

Part No. Description In stock
BTC5100-OPA400(I)-P BBO crystal with the size 5 x 5 x 1.0mm, P-coating, for Type I noncollinear phasematched optical parametric amplification (NOPA) pumped by ~ 400 nm,  mounted in 1" anodized Al holder Yes
BTC5200-OPA400(I)-P BBO crystal with the size 5 x 5 x 2.0mm, P-coating, for Type I noncollinear phasematched optical parametric amplification (NOPA) pumped by ~ 400 nm,  mounted in 1" anodized Al holder Yes
BTC5300-OPA400(I)-P BBO crystal with the size 5 x 5 x 3.0mm, P-coating, for Type I noncollinear phasematched optical parametric amplification (NOPA) pumped by ~ 400 nm,  mounted in 1" anodized Al holder Email/Call
BTC5300-OPA520(I)-P BBO crystal with the size 5 x 5 x 3.0mm, P-coating, for Type I noncollinear phasematched optical parametric amplification (NOPA) pumped by ~ 520 nm ( frequency-doubled fiber laser ), mounted in 1" anodized Al holder Email/Call
BTC5500-OPA520(I)-P BBO crystal with the size 5 x 5 x 5.0mm, P-coating, for Type I noncollinear phasematched optical parametric amplification (NOPA) pumped by ~ 520 nm ( frequency-doubled fiber laser ), mounted in 1" anodized Al holder Email/Call

BBO for Second Harmonic Generation (SHG) of Femtosecond Yb Fiber Lasers

Part No. Description In stock
BTC5050-SHG1040(I)-P BBO crystal with the size 5 x 5 x 0.5mm, P-coating, for Type I SHG of  λ centred @ 1040 nm,  mounted in 1" anodized Al holder Email/Call
BTC5100-SHG1040(I)-P BBO crystal with the size 5 x 5 x 1.0 mm, P-coating, for Type I SHG of  λ centred @ 1040 nm,  mounted in 1" anodized Al holder Email/Call
BTC5150-SHG1040(I)-AR BBO crystal with the size 5 x 5 x 1.5 mm, AR coating, for Type I SHG of  λ centred @ 1040 nm,  mounted in 1" anodized Al holder Yes
BTC5200-SHG1040(I)-P BBO crystal with the size 5 x 5 x 2.0mm, P-coating, for Type I SHG of  λ centred @ 1040 nm,  mounted in 1" anodized Al holder Email/Call
BTC5300-SHG1040(I)-P BBO crystal with the size 5 x 5 x 3.0 mm, P-coating, for Type I SHG of  λ centred @ 1040 nm,  mounted in 1" anodized Al holder Email/Call

BBO for Fourth Harmonic Generation (FHG) of Femtosecond Yb Fiber Lasers

Part No. Description In stock
BTC5050-SHG520(I)-P BBO crystal with the size 5 x 5 x 0.5mm, P-coating, for Type I SHG of  λ centred @ 520 nm (FHG of 1040nm),  mounted in 1" anodized Al holder Email/Call
BTC5100-SHG520(I)-P BBO crystal with the size 5 x 5 x 1.0 mm, P-coating, for Type I SHG of  λ centred @  520 nm (FHG of 1040nm),  mounted in 1" anodized Al holder Email/Call
BTC5150-SHG520(I)-P BBO crystal with the size 5 x 5 x 1.5mm, P-coating, for Type I SHG of  λ centred @ 520 nm (FHG of 1040nm),  mounted in 1" anodized Al holder Yes
BTC5200-SHG520(I)-P BBO crystal with the size 5 x 5 x 2.0 mm, P-coating, for Type I SHG of  λ centred @  520 nm (FHG of 1040nm), mounted in 1" anodized Al holder Email/Call

Thin crystals with different dimensions ( aperture up to 20.0mm), cut angles, or coatings are routinely fabricated by Newlight Photonics.  Please contact us for the crystals that best suit your applications.

Coatings

Protective coating (P-coating): This is a single-layer MgF2 coating. The primary function of the P-coating is to "protect" polished BBO surfaces from fogging by ambient moisture. Also, the P-coating partially reduce reflection from polished surfaces at a certain wavelength range e.g. 400-800nm.  Coating curve: P-coating.

Anti-reflective coating (AR coating): This is a multi-layer dielectric coating. Single-band, dual-band or broad-band AR coatings on BBO surfaces are available for different applications. Coating curves: AR800/400nm, AR532/266nm, AR710/355nm (typical).

Uncoated (UC) crystals are available upon request. These crystals have to be used in a heated mount or a dry air/nitrogen environment.

Substrate

Crystals of thickness 50m (0.05mm) or thinner are supplied optically contacted on UV fused silica substrates with a typical thickness of 2.0mm. Ultrafast pulses should be incident on the crystal side.

Mount

For customer convenience and protection of thin crystals, all thin crystals are pre-mounted in a standard 1" ( 25.4mm ) anodized aluminum (Al) holder.  The orientation of a crystal mounted in a standard holder for second harmonic generation (SHG) can be seen here.  Customer holders ( e.g. holders with openings to steer a probe beam past the edge of the crystal) are also available at a small cost.   A conventional 1" mirror or lens mount may be conveniently used to tune the crystals for optimized frequency conversions. (Mirror mounts and posts are not included)


Specifications of finished thin BBO crystal

Wavefront distortion:

less than λ/8 @ 633nm

Clear aperture:

> 90% central area

Flatness:

λ/8 @ 633nm

Surface quality:

10/5 Scratch/Dig per MIL-O-13830A

Parallelism:

better than 20 arc seconds

Perpendicularity:

15 arc minutes

Angle tolerance:

Δθ < 0.25o, Δφ < 0.25o


 

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