850nm 40mW Laser Diode with Built-in Photo Diode TO18 5.6mm Package

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$ 23.16

850nm 40mW Laser Diode with Built-in Photo Diode TO18 5.6mm Package The QSI 850nm 40mW laser diode, grown via MOCVD with an AlGaAs quantum well structure — engineered as a robust light source for industrial optical modules and sensor applications. Operating at a typical 855nm wavelength (ranging 845–865nm), it delivers a steady 40mW continuous-wave (CW) optical output (with a 60mW maximum rating). Housed in a compact TO-18 (5.6mm) package, it integrates a built-in photodiode for real-time laser performance monitoring, simplifying integration into precision industrial setups. Engineered for efficiency and consistency, it features a 30mA typical threshold current, 95mA typical operating current (at 40mW output), and 2.0V typical operating voltage — paired with a 1.1mW/mA slope efficiency to optimize energy conversion. Its controlled beam divergence (9° parallel, 18° perpendicular typical) ensures focused, stable light delivery, while it functions reliably across a -10 to 60°C operating temperature range (and -40 to 85°C during storage). Whether powering industrial optical modules or high-sensitivity sensors, this 850nm 40mW laser diode combines QSI’s advanced quantum well engineering, built-in monitoring, and compact design to meet the demands of mid-power, high-precision optoelectronic applications. Core Specification: Wavelength 850nm Output Power 40mW Working Voltage 2V Package TO18 5.6mm Condition Original package and brand new Lifespan > 10,000 hours BU-LASER has other Laser diodes from 375nm to 1064nm: Color Wavelength Power Range Package UV 375nm 500mW TO5-9mm UV 380nm 200mW TO18-5.6mm Violet 395nm 300mW TO18-5.6mm Violet 405nm 20mW-3W TO18-5.6mm /TO5-9mm Blue 425nm 1.5W TO18-5.6mm Blue 435nm 5W-7W TO5-9mm Blue 450nm/455nm 80mW -5.5W TO18-5.6mm /TO5-9mm Blue 462nm/ 465nm 1.4W- 2.8W TO5-9mm Cyan 488nm 55mW-300mW TO18-5.6mm Green 515nm/520nm 10mW-1.6W TO18-3.8mm/TO18-5.6mm/TO5-9mm /Frame Red 635nm/638nm/642nm 5mW-2.5W TO18-3.8mm/TO18-5.6mm/TO5-9mm Red 650nm /658nm/660nm 5mW-1W TO18-3.3mm/TO18-3.8mm/TO18-5.6mm/C-mounted / Frame Red 670nm 5mW TO18-5.6mm Infrared 780nm/785nm 5mW-200mW TO18-5.6mm Infrared 808nm 200mW-5W TO18-5.6mm/TO5-9mm/C-mounted Infrared 830nm 30mW-300mW TO18-5.6mm Infrared 850nm 5mW-2W TO18-5.6mm Infrared 905nm 15W-75W TO18-5.6mm Infrared 940nm 250mW TO18-5.6mm Infrared 980nm 50mW-1W TO18-5.6mm/TO5-9mm Infrared 1064nm 50mW TO18-5.6mm

Can I return surplus stock?

Unopened cartons may be returned within 14 days for store credit (excludes custom-printed items). Freight is at the buyer’s cost.

What if my order arrives damaged?

Photograph the packaging and product within 48 hours and email [email protected]. We’ll arrange a replacement or refund immediately.

I have a business do you offer wholesale pricing?

Click via the website – Wholesale customers apply here and complete your details with business name and we will be back in contact with you quickly.

What payment methods do you accept?

Visa, MasterCard, Afterpay, bank transfer, and 20th-of-month trade accounts for approved wholesale customers. In store pay wave includes all the above and also Amex.

Is the tissue acid free?

Yes all our tissue paper is certified acid free

Do you offer design help?

Our in-house team can suggest colour palettes, ribbon combinations, or box sizes free of charge.

Do you provide a gift-wrapping service?

We supply materials only but are unable to do the wrapping for you.

Will you have a pop-up shop again for Christmas?

Yes on-site downstairs – plenty of parking available. Our Christmas Pop-Up runs 1 November – 23 December 2025 at the same 235 Archers Rd, Wairau Valley location.

Is your showroom open to the public?

Yes everyone is welcome. Winter hours Mon-Thurs 10am-4pm, Fri 10am-3pm. Nov-Dec - Mon-Sat 10am-4pm. Trade buyers, Corporate and the general public are welcome.

Do you sell food packaging?

We do stock some items and if food safe certifed we will state this in the product description. If you are wanting large numbers of food packaging you are better to go to a supplier that specialises in this.

Do you offer environmentally friendly packaging?

More than 50 % of our range is recyclable, or made from post-consumer fibre. Look for the trust icons on each product page and check out or Eco collection also.

Can you match my brand colours exactly for printing on ribbon?

We will suggest the closest colour we have from our stocks but cannot print to match exactly.

Can you print my logo on bags, boxes, or ribbon?

We print locally onto selected ribbons, bags and boxes. Send us a vector file (AI, EPS or PDF). Via website > customise> then complete the quotation form and we will get back to you with pricing.

Do you ship internationally?

We don’t currently as each time we look into it is too expensive via courier.

Why does it not give me the option for local pick-up?

Even though you are collecting you need to enter a shipping address for this to show

Can I pick up my order?

Choose “Local Pick up” at checkout. Winter hours (Mon–Thurs, 10 am – 4 pm. Fri 10am-3pm). We’ll email when it’s packed and ready to pick up. If these hours are not workable for you do contact us and we will try to accommodate. Nov and Dec Mon-Sat 10am-4pm.

Do you deliver to the South Island and rural addresses?

Yes. North Island overnight, South Island 2 business days, rural allow 2-3 extra days. Rates are shown at checkout; oversized items may incur a surcharge.

Orders placed before 12 PM (with confirmed payment) will be dispatched the same day.
Standard courier timing via NZ Couriers is overnight North Island and 2 days to the South Island.
Rural is an additional 2-3 days.
Pick-ups available at 235 Archers Road, Wairau Valley, Auckland.