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Thin LBO Crystal for Ultrafast
Lasers
For frequency conversions of
ultrafast lasers, one of the the main concerns is pulse broadening induced
by group velocity (Vg) mismatch between the input pulse(s) 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 on XY plane |
SHG
@
700 nm |
SHG
@
800 nm |
SHG
@
900 nm |
SHG
@
1064 nm |
SFG @
800nm + 400nm |
SFG
@
900 nm + 450nm |
|
IGVM (ps/cm) |
1.73 |
1.20 |
0.87 |
0.43 |
4.47 |
3.33 |
|
Lmax@10fs (µm) |
60 |
85 |
115 |
232 |
22 |
30 |
A thickness of sub-100
µm
( 0.1 mm) is desired for most frequency conversion processes of 10fs pulses. In particular, crystals as thin as 10-20
µm may be needed for reaching shorter wavelengths.
Newlight Photonics Inc.
can provide thin LBO crystals for frequency conversions of very short pulses.
We also supply birefringent calcite
plates and alpha-BBO plates for
compensation of temporal walkoff in nonlinear crystals (time delay
compensators), please contact us for details.
Standard
Products
|
Part No. |
Description |
In stock |
|
LTC5001-SHG800(I)-UC |
LBO crystal with the size 5 x 5 x 0.01mm, polished and uncoated, for Type I SHG of
λ centred @ 800 nm, mounted
in 1" anodized Al holder |
Email/Call |
|
LTC5010-SHG800(I)-UC |
LBO crystal with the size 5 x 5 x 0.1mm, polished and uncoated, for Type I SHG of
λ centred @ 800 nm, mounted
in 1" anodized Al holder |
Email/Call |
|
LTC5050-SHG800(I)-UC |
LBO crystal with the size 5 x 5 x 0.5mm, polished and uncoated,
for Type I SHG of
λ
centred @ 800 nm, mounted in 1" anodized Al holder |
Email/Call |
|
LTC5100-SHG800(I)-UC |
LBO crystal with the size 5 x 5 x 1.0mm, polished and uncoated, for Type I SHG of
λ centred @ 800 nm, mounted
in 1" anodized Al holder |
Yes |
|
LTC5300-SHG800(I)-UC |
LBO crystal with the size 5 x 5 x 3.0mm, polished and uncoated, for
Type I SHG of
λ
centred @ 800 nm, mounted in 1" anodized Al holder |
Email/Call |
|
LTC5050-SHG800(I)-AR |
LBO 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 |
Email/Call |
|
LTC5100-SHG800(I)-AR |
LBO 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 |
Email/Call |
|
LTC5300-SHG800(I)-AR |
LBO crystal with the size 5 x 5 x 3.0mm,
AR@800/400nm, for
Type I SHG of
λ
centred @ 800 nm, mounted in 1" anodized Al holder |
Email/Call |
|
LTC5100-SHG1064(I)-AR |
LBO crystal with the size 5 x 5 x 1.0mm,
AR@1064/532nm, for
Type I SHG of
λ
centred @ 1064nm, mounted in 1" anodized Al holder |
Email/Call |
|
LTC5200-SHG1064(I)-AR |
LBO crystal with the size 5 x 5 x 2.0mm,
AR@1064/532nm, for
Type I SHG of
λ
centred @1064nm, mounted in 1" anodized Al holder |
Yes |
|
LTC5300-SHG1064(I)-AR |
LBO crystal with the size 5 x 5 x 3.0mm,
AR@1064/532nm, for
Type I SHG of
λ
centred @1064nm, mounted in 1" anodized Al holder |
Yes |
|
LTC5100-THG1064(II)-UC |
LBO crystal with the size 5 x 5 x 1.0mm, polished and uncoated,
for Type II sum frequency mixing of
λ
centred @ 1064 nm and
λ/2
centred @ 532 nm to obtain
λ/3 (THG),
mounted in 1" anodized Al holder |
Email/Call |
|
LTC5300-THG1064(II)-UC |
LBO crystal with the size 5 x 5 x 3.0mm, polished and uncoated,
for Type II sum frequency mixing of
λ
centred @ 1064 nm and
λ/2
centred @ 532 nm to obtain
λ/3 (THG),
mounted in 1" anodized Al holder |
Email/Call |
|
LTC5100-THG1064(II)-AR |
LBO crystal with the size 5 x 5 x 1.0mm,
AR@1064/532/355nm,
for Type II sum frequency mixing of
λ
centred @ 1064 nm and
λ/2
centred @ 532 nm to obtain
λ/3 (THG),
mounted in 1" anodized Al holder |
Email/Call |
|
LTC5300-THG1064(II)-AR |
LBO crystal with the size 5 x 5 x 3.0mm,
AR@1064/532/355nm,
for Type II sum frequency mixing of
λ
centred @ 1064 nm and
λ/2
centred @ 532 nm to obtain
λ/3 (THG),
mounted in 1" anodized Al holder |
Email/Call |
Coating
LBO crystal is non-hygroscopic, therefore the protective
coating ( P-coating) is not needed. Uncoated (UC) crystal may be used if the surface
reflectance of 3-4% is acceptable. Our standard coatings are AR@ 800nm and
1064nm and their
harmonics. Custom coatings (e.g. AR@810, 1053, 1042nm) are also available upon
request.
Substrate
Crystals of thickness less than 100
µm are supported on UV fused silica substrates with a typical thickness of 2.0mm. The 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. 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 LBO 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 |
|
