1 optically pumped light emitting diodes (op leds) specifications (t=24 0 c) type no. MIRO39-xx-xxxxx series peak wavelength m 3.90.1 spectral fwhm, m 0.7 0.75 pulse duration 10 pulse conditions: pulse period t s 1000 maximum pulse current i pulse ma 1000 pulse voltage at i=1000 ma u pulse v 2.1 2.8 pulse power at i=1000 ma p pulse w 25040 maximum cw current (with a heatsink) i cw ma 50 cw voltage at i=50 ma u cw v 1.30 1.4 cw power at i=50 ma p cw w 204 d /dt nm/k -4.2 dp/dt %/k -(0.60.7) p ackage house code lens type lens material emission size angle of view fwhm storage conditions operation conditions polarity mm deg 0 c 0 c to18 - ? 0.8 140 -25 to +55 -25 to +50 short leg or key is negative to18 mil chalcogenide glass ? 1 50 -25 to +50 -25 to +45 the same to39 - ? 0.8 140 -25 to +55 -25 to +50 the same to39 il cdsb or si ? 3.5 35 -25 to +50 -25 to +45 the same type no. MIRO39-140-18s MIRO39-50-18gml MIRO39-140-39s MIRO39-50-39gml MIRO39-35-39cl (to18) (to18+mil) (to39) (to39+mil) (to39+il) package photo
2 general characterization current dependence of the output power (l-i) (24 0 c) 0 200 400 600 800 1000 1200 1400 1600 0.0 0.1 0.2 0.3 0.4 24 o c, f=2 khz =10 s =50 s =250 s to39 attached to a heatsink pulse power (mw) current (ma) 0 200 400 600 800 1000 0.00 0.05 0.10 0.15 0.20 0.25 24 o c, f=2 khz =10 s =50 s =250 s to39 without a heatsink pulse power (mw) current (ma) 0 200 400 600 800 1000 0.00 0.05 0.10 0.15 0.20 0.25 24 o c, f=2 khz =10 s =50 s =250 s to18 attached to a heatsink pulse power (mw) current (ma) 0 100 200 300 400 500 600 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 24 o c, f=2 khz =10 s =50 s =250 s to18 without a heatsink pulse power (mw) current (ma) maximal current vs. operation conditions 0.01 0.1 1 50 60 70 80 90 100 200 300 400 500 600 700 800 900 1000 2000 3000 duty cycle = /t, - pulse duration, t - period duration maximum current, ma duty cycle to39 attached to a heatsink to39 without and to18 with a heatsink to18 without a heatsink
3 current dependence of the emission spectra(24 0 c, f=2khz, =5 s) 2.5 3.0 3.5 4.0 4.5 0 1 2 3 4 100 ma 500 ma 1000 ma 2000 ma 3000 ma 24 o c, f=2 khz, =5 s to39 attached to a heatsink intensity (arb.un.) wavelength ( m) 2.5 3.0 3.5 4.0 4.5 0.0 0.5 1.0 co 2 absorption 100 ma 1000 ma 3000 ma to39 attached to a heatsink wavelength ( m) normalized intensity 2.5 3.0 3.5 4.0 4.5 5.0 0.0 0.5 1.0 1.5 2.0 100 ma 500 ma 1000 ma 2000 ma 24 o c, f=2 khz, =5 s to39 without a heatsink intensity (arb.un.) wavelength ( m) 2.5 3.0 3.5 4.0 4.5 0.0 0.5 1.0 100 ma 1000 ma 2000 ma to39 without a heatsink wavelength ( m) normalized intensity normalized emission spectra at maximal current(24 0 c) 2.5 3.0 3.5 4.0 4.5 0.0 0.5 1.0 24 o c, f=2 khz, =50 s i=1000 ma to39 attached to a heatsink normalized intensity wavelength ( m) 2.5 3.0 3.5 4.0 4.5 0.0 0.5 1.0 co 2 absorption to39 attached to a heatsink 24 o c, f=2 khz, =250 s i=250 ma wavelength ( m) normalized intensity 2.5 3.0 3.5 4.0 4.5 0.0 0.5 1.0 24 o c, f=2 khz, =50 s i=500 ma to39 without a heatsink normalized intensity wavelength ( m) 2.5 3.0 3.5 4.0 4.5 0.0 0.5 1.0 24 o c, f=2 khz, =250 s i=150 ma to39 without a heatsink wavelength ( m) normalized intensity
4 emission spectra and output power vs. temperature -20-100 1020304050 0.8 0.9 1.0 1.1 1.2 1.3 1.4 -20-100 1020304050 3.8 3.9 4.0 4.1 4.2 peak wavelength ( m) temperature (c) power at fix. current temperature (c) current-voltage (i-v) characteristics 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0 500 1000 1500 2000 2500 3000 1.21.31.41.51.61.7 0 100 200 300 400 500 current (ma) voltage (v) current (ma) voltage (v) far-field pattern -90 -60 -30 0 30 60 90 0.0 0.5 1.0 -90 -60 -30 0 30 60 90 0.0 0.5 1.0 -90 -60 -30 0 30 60 90 0.0 0.2 0.4 0.6 0.8 1.0 lens type: il fwhm=34 deg. intensity, arb. units angle, deg. lens type: mil fwhm=50 deg angle, deg. no lens fwhm=140 deg angle, deg.
5 several useful notes microimmersion lenses (mil) are made from chalcogenide glass with low melting temperature (60-70 o c). that?s why, please, try to install them vertically, pay attention to heasinking conditions and avoid any heaters close to the mil-leds. maximum operating current is defined as that producing t=10-20 k overheating of the p-n junction relative to a heatsink temperature. we recommend not exceeding 0.75 imax for long term operating devices. in certain applications it?s important to know that in addition to mid-ir radiation most optically pumped leds emit nir pumping radiation ? 0.87 m as well (see graph on the right). this ?parasitic? emission can be cut off by filters or by a detector window, e.g. by cdsb lens in to-39 packed leds. 0.80 0.85 0.90 0.95 0.0 0.5 1.0 intensity (arb.un.) wavelength ( m) don?t touch the chip, connecting wires and mil surface. answers to frequently asked questions q: what are the advantages of the il and mil package? a: op leds with immersion lenses emit radiation within small spatial angle, so it is easier to get a signal at some distance from the led. q: what is the main difference between leds with microimmersion lens (mil) and leds with immersion lens (il)? a: mil leds are brighter/smaller than the l-equipped leds and thus standard detectors with 1 1 mm 2 area can be used (spherical mirror or close ?face-to-face? schemes). however, il leds are more stable than the mil leds with respect to heating and high drive currents.
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