What documentation is available for BGS (BaGa4S7) Mid-IR Nonlinear Crystal for OPO and OPA, 0.35–13.7 µm?

The following documents are available for download on the BGS (BaGa4S7) Mid-IR Nonlinear Crystal for OPO and OPA, 0.35–13.7 µm product page: Spec sheet.Visit the Documents tab for direct download links.

Is BGS (BaGa4S7) Mid-IR Nonlinear Crystal for OPO and OPA, 0.35–13.7 µm available for purchase?

Yes, request a quote for pricing and lead time at WaveQuanta.Contact our sales team for current availability and volume pricing.

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BGS (BaGa4S7) Mid-IR Nonlinear Crystal for OPO and OPA, 0.35–13.7 µm

Name: BGS (BaGa4S7) Mid-IR Nonlinear Crystal for OPO and OPA, 0.35–13.7 µm
Brand: WaveQuanta
SKU: WQ-NLC-BGS

WQ-NLC-BGS

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BGS (barium gallium sulfide, BaGa4S7) is a mid-infrared nonlinear crystal with a wide band gap of 3.54 eV and stable chemical properties. It transmits from 0.35 µm to 13.7 µm and shows no two-photon absorption at 1 µm, so it can be pumped directly by 1064 nm Nd:YAG lasers or by commercially common 1030 nm femtosecond lasers. WaveQuanta supplies BGS as oriented blanks and as coated elements for OPO, OPA, DFG, SFG and OPG.

Key Features

Transmission range 0.35–13.7 µm (UV cut-off 350 nm, IR cut-off 13.7 µm)
Band gap 3.54 eV
Nonlinear coefficient d33 = 12.7 pm/V
No two-photon absorption at 1 µm, allowing pumping at 1064 nm or 1030 nm
Chemically stable
Flatness λ/8 @ 632.8 nm and parallelism 30″

Typical Applications

Mid-IR OPO pumped by 1064 nm Nd:YAG lasers
OPA and OPG pumped by 1030 nm femtosecond lasers
Difference-frequency generation (DFG) in the mid-IR
Sum-frequency generation (SFG)

Standard Sizes

Size	Cut / orientation	Surface / coating	Mount
5 × 5 × 3 mm	θ = 14°, φ = 0°, XZ-cut	AR/AR @ 1.0–1.3 µm + 6–11 µm	Unmounted
5 × 5 × 9.8 mm	θ = 12.5°, φ = 0°	S1: AR @ 1–1.3 µm; S2: P-coating @ 8 µm	Unmounted
5 × 5 × 10 mm	θ = 13°, φ = 0°, XZ-cut	Blank	Unmounted
8 × 8 × 2.5 mm	θ = 47.6°, φ = 90°, YZ-cut	Blank	Unmounted
8 × 8 × 3.5 mm	θ = 47.6°, φ = 90°, YZ-cut	Blank	Unmounted

Availability of individual sizes changes; custom sizes, cut angles and coatings are available on request.

Related Products

BGSe Crystal — selenide version
LGS Crystal — 1 µm-pumped mid-IR
AGGS Crystal — wide transparency

Browse all: Mid-IR Nonlinear Crystals · Nonlinear Crystals

Model: WQ-NLC-BGS · Custom sizes, orientations and coatings on request — contact WaveQuanta for a quote and lead time.

Chemical Formula	BaGa4S7
Transmission Range	0.35–13.7 µm
UV Cut-off Edge	350 nm
IR Cut-off Edge	13.7 µm
Band Gap	3.54 eV
Nonlinear Coefficient	d33 = 12.7 pm/V
Density	3.95 g/cm³
Two-Photon Absorption at 1 µm	None
Aperture Tolerance	+0/−0.1 mm
Length Tolerance	±0.1 mm
Surface Quality	40-20 scratch-dig
Flatness	λ/8 @ 632.8 nm (length ≥ 1 mm)
Perpendicularity	10′
Parallelism	30″

Specification Sheet PDF — Download

No CAD drawings available for this product.

Product Family: Mid-IR Nonlinear Crystals (11 variants)

Product ▴▾	SKU	Size ▴▾	Clear Aperture ▴▾	Operating Wavelength ▴▾
BGSe (BaGa4Se7) Nonlinear Crystal for Mid-IR, 0.47–18 µm, d11 = 24 pm/V	`WQ-NLC-BGSE`	—	—	—	Contact
HGS (HgGa2S4) Nonlinear Crystal for Mid-IR SHG and OPO, 0.55–13 µm	`WQ-NLC-HGS`	—	—	—	Contact
AGGS (AgGaGeS4) Nonlinear Crystal for 1 µm-Pumped Mid-IR, 0.5–11.5 µm	`WQ-NLC-AGGS`	—	—	—	Contact
BGGSe (BaGa2GeSe6) Nonlinear Crystal for Mid-IR, 0.5–18 µm, d11 = 66 pm/V	`WQ-NLC-BGGSE`	—	—	—	Contact
GaSe (Gallium Selenide) Nonlinear Crystal for Mid-IR SHG and THz, 0.62–20 µm	`WQ-NLC-GASE`	—	—	—	Contact
BGS (BaGa4S7) Mid-IR Nonlinear Crystal for OPO and OPA, 0.35–13.7 µm Current	`WQ-NLC-BGS`	—	—	—
LGS (LiGaS2) Nonlinear Crystal for Mid-IR OPO and OPA, 0.32–11.6 µm	`WQ-NLC-LGS`	—	—	—	Contact
ZGP (ZnGeP2) Nonlinear Crystal for Mid-IR OPO, 0.75–12 µm	`WQ-NLC-ZGP`	—	—	—	Contact
AGS (AgGaS2) Nonlinear Crystal for Mid-IR DFG and OPO, 0.50–13.2 µm	`WQ-NLC-AGS`	—	—	—	Contact
AGSe (AgGaSe2) Nonlinear Crystal for Mid-IR OPO and CO2 SHG, 0.73–18 µm	`WQ-NLC-AGSE`	—	—	—	Contact
AGGSe (AgGaGe5Se12) Nonlinear Crystal for 1 µm-Pumped Mid-IR, 0.63–16 µm	`WQ-NLC-AGGSE`	—	—	—	Contact

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