{"id":49153,"date":"2025-06-09T13:55:24","date_gmt":"2025-06-09T13:55:24","guid":{"rendered":"https:\/\/photonics.laser2000.co.uk\/?post_type=product&#038;p=49153"},"modified":"2026-02-20T12:25:42","modified_gmt":"2026-02-20T12:25:42","slug":"picosecond-pulsed-leds","status":"publish","type":"product","link":"https:\/\/stagingphotonics.laser2000.co.uk\/?product=picosecond-pulsed-leds","title":{"rendered":"Picosecond pulsed LEDs"},"content":{"rendered":"<p><strong>Picosecond pulsed LEDs<\/strong><\/p>\n<ul>\n<li>Wavelengths from 355 to 600 nm<\/li>\n<li>Peak power up to 2.5 mW<\/li>\n<li>Pulse widths as short as 600 ps (FWHM)<\/li>\n<li>Repetition rate from single shot up to 40 MHz<\/li>\n<li>Optional bandpass filter<\/li>\n<\/ul>\n<p>The pulsed LEDs of the PLS Series are the fastest miniature sub-nanosecond pulsed LED sources commercially available. They combine short pulse widths with high repetition rates in a compact and maintenance free set-up.<\/p>\n<p>&nbsp;<\/p>\n<h2>Pulse widths down to 600\u00a0ps<\/h2>\n<p>All pulsed LEDs emit picosecond pulses with a full width at half maximum (FWHM) of less than one nanosecond \u2013 at some wavelengths even pulse widths down to 600\u00a0ps are possible. The pulse width itself cannot be controlled, but does depend on the selected power level of the LED.<\/p>\n<h2>Average power of several microwatts<\/h2>\n<p><a title=\"Pulse profile examples of the PLS Series pulsed LEDs\" href=\"https:\/\/www.picoquant.com\/?ACT=32&amp;f=merge_pls.jpg&amp;fid=27&amp;d=21\" data-fancybox-group=\"image-group0\"><img decoding=\"async\" class=\"ci-right ci-image perc30 with-border aligncenter\" title=\"Examples of pulse profile for pulsed LEDs from the PLS Series\" src=\"https:\/\/www.picoquant.com\/images\/uploads\/product_images\/21\/merge_pls__small.jpg\" alt=\"Examples of pulse profile for pulsed LEDs from the PLS Series\" \/><\/a><\/p>\n<p>All LED heads are designed to emit an about constant pulse energy at a given intensity setting. Doubling the repetition rate therefore effectively doubles the average output power. The achievable pulse energies of the LEDs in the visible spectrum can reach up to 2\u00a0pJ, which corresponds to average output powers up to 80\u00a0\u00b5W at 40\u00a0MHz repetition rate. For the UV LEDs the achievable pulse energy is lower and typically below 1\u00a0pJ. At their maximum repetition rate of 10\u00a0MHz, this corresponds to average output powers around 1\u00a0\u00b5W.<\/p>\n<h2>Spectral width down to 10 nm<\/h2>\n<p>The spectral emission profile of all pulsed LEDs is broader than for pulsed diode lasers. For the UV LEDs the spectral width is smaller than 20\u00a0nm, whereas for the LEDs in the visible it may be as large as 50\u00a0nm. A further reduction of the spectral width is possible by using suited bandpass filters.<\/p>\n<h2>Suitable for time-resolved fluorescence spectrometers<\/h2>\n<p>The most important difference between the pulsed LEDs and pulsed diode lasers is the fact that the emission of the LEDs is divergent, not coherent, not polarized and also non-uniform in its intensity distribution. Depending on the LED used, different beam shapes can be seen ranging from near-round to elliptical. Fiber coupling into single mode or multimode optical fibers has therefore only very low efficiency \u2013 a notable exception are large area fibers such as liquid light guides. However, for short range interactions, e.g., in a compact\u00a0<a href=\"https:\/\/stagingphotonics.laser2000.co.uk\/product-category\/light-detection-and-imaging\/spectroscopy-hyperspectral-imaging\/fluorescence-spectrometers\/\">time-resolved fluorescence lifetime spectrometer<\/a>\u00a0the LEDs of the PLS Series are very useful excitation sources.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sub-nanosecond pulsed LEDs<\/p>\n","protected":false},"featured_media":49226,"template":"","meta":{"_acf_changed":false,"footnotes":""},"product_brand":[],"product_cat":[120,109],"product_tag":[],"class_list":{"0":"post-49153","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-picosecond-pulsed-leds","7":"product_cat-short-pulse-ns-ps-fs-lasers","9":"first","10":"instock","11":"shipping-taxable","12":"product-type-simple"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.6 (Yoast SEO v27.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Picosecond pulsed LEDs - PLS Series - PicoQuant - Laser 2000<\/title>\n<meta name=\"description\" content=\"Picosecond pulsed LEDs: Ideal excitation sources in spectrometer systems not requiring high spatial resolution. 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