Applications:
* A quite high overall
conversion efficiency and 540-1030nm tunable wavelength range
were obtained with OPO pumped at 355nm.
* Type I OPA pumped
at 355nm with the pump-to-signal energy conversion efficiency
of 30% has been reported.
* Type II NCPM OPO
pumped by a XeCl excimer laser at 308nm has achieved 16.5%
conversion efficiency, and moderate tunable wavelength ranges
can be obtained with different pumping sources and temperature
tuning.
* By using the NCPM
technique, type I OPA pumped by the SHG of a Nd:YAG laser
at 532nm was also observed to cover a wide tunable range from
750nm to 1800nm by temperature tuning from 106.5°C to 148.5°C.
* By using type
II NCPM LBO as an optical parametric generator (OPG) and type
I critical phase-matched BBO as an OPA, a narrow linewidth
(0.15nm) and high pump-to-signal energy conversion efficiency
(32.7%) were obtained when it is pumped by a 4.8mJ, 30ps laser
at 354.7nm. Wavelength tuning range from 482.6nm to 415.9nm
was covered by increasing the temperature of LBO or rotating
BBO.
LBO's
Spectral NCPM
Not only the ordinary
non-critical phase matching (NCPM) for angular variation but
also the noncritical phase matching for spectral variation
(SNCPM) can be achieved in the LBO crystal. As shown in Fig.2,
the phase matching retracing positions are λ1=1.31μm with θ =86.4°, φ=0° for Type
I and λ2=1.30μm with θ=4.8°, φ=0° for Type
II. The phase matching at these positions possess very large
spectral acceptances Δλ. The calculated
Δλ at λ1 and λ2are 57nm-cm-1/2 and 74nm-cm-1/2 respectively, which are much
larger than the other NLO crystals. These spectral characteristics
are very suitable for doubling broadband coherent radiations
near 1.3μm, such as those from some diode lasers, and some
OPA/OPO output without linewidth-narrowing components.
The crystal holder (free) and oven & Temperature Controller (for
NCPM,OPO,OPA applications) are available for BBO & LBO.
AR-coating
CASTECH provides the
following AR-coatings:
* Dual Band AR-coating
(DBAR) of LBO for SHG of 1064nm.
· low reflectance (R<0.2%
at 1064nm and R<1.0% at 532nm );
· high damage threshold
(>500MW/cm2at both wavelengths);
· long durability.
* Broad Band AR-coating
(BBAR) of LBO for SHG of tunable lasers.
* Other coatings are
available upon request.
CASTECH Warranty on
LBO Specifications
* Dimension tolerance:
(W±0.1mm)x(H±0.1mm)x(L+0.5/-0.1mm) (L≥2.5mm)
(W±0.1mm)x(H±0.1mm)x(L+0.1/-0.1mm)
(L<2.5mm)
* Clear aperture: central
90% of the diameter
* No visible scattering
paths or centers when inspected by a 50mW green laser
* Flatness: less than
λ/8 @ 633nm
* Transmitting wavefront
distortion: less than λ/8 @ 633nm
* Chamfer: ≤0.2mm@450
* Chip: ≤0.1mm
* Scratch/Dig code:
better than 10/ 5 to MIL-O-13830A
* Parallelism: better
than 20 arc seconds
* Perpendicularity:
≤5 arc minutes
* Angle tolerance:
Δθ≤0.25°, Δφ≤0.25°
* Damage threshold[GW/cm
]: >10 for 1064nm, TEM00, 10ns, 10HZ (polished only)
>1
for 1064nm, TEM00, 10ns, 10HZ (AR-coated)
>0.5
for 532nm, TEM00, 10ns, 10HZ (AR-coated)
* Quality Warranty
Period: one year under proper use.
NOTE
1. LBO
has a very low susceptibility to moisture. Users are advised
to provide dry conditions for both the use and preservation
of LBO.
2.
Polished surfaces of LBO requires precautions to prevent any
damage.
3.
CASTECH engineers can select and design the best crystal for
you, if the main parameters of your laser are provided, such
as energy per pulse, pulse width and repetition rate for a
pulsed laser, power for a cw laser, laser beam diameter, mode
condition, divergence, wavelength tuning range, etc.
4.
For thin crystal, CASTECH can provide free holder for you.
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