Laser Hair Removal: Diode vs. Alexandrite, Skin Types, Sessions & Aftercare
An evidence-based guide to selective photothermolysis, choosing the right wavelength for your Fitzpatrick skin type, and what to expect from a full course, from the certified laser technicians at Skin Blossom Pro.
Laser hair removal is a Health Canada-approved medical procedure that uses selective photothermolysis to destroy the hair follicle’s germinative cells while leaving surrounding skin intact. A concentrated wavelength of light is absorbed by melanin in the hair shaft, converted to heat, and conducted down to the bulb and bulge of the follicle, disabling future hair growth. Our professional laser hair removal treatments are performed by certified laser technicians using a clinical-grade platform suitable for Fitzpatrick skin types I through VI.
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How Laser Hair Removal Works: Selective Photothermolysis
The principle of selective photothermolysis was defined by Anderson and Parrish at the Wellman Center for Photomedicine in 1983. The laser delivers a pulse whose wavelength is preferentially absorbed by a target chromophore, in this case, melanin, while its pulse duration is shorter than the thermal relaxation time of surrounding tissue. The result is selective destruction of the follicle without burning the epidermis.
Only hairs currently in the anagen (active growth) phase contain enough melanin and a connected follicle to be permanently disabled. At any moment, only 15 to 25% of the hairs in a treatment area are in anagen, which is why a course of 6 to 10 sessions spaced 4 to 8 weeks apart is required.
Diode vs. Alexandrite vs. Nd:YAG: Choosing the Right Wavelength
Alexandrite (755 nm)
Highest melanin absorption. Best for Fitzpatrick I to III with coarse dark hair. Fast spot size; excellent for legs, back, and arms.
Diode (810 nm)
Mid-range wavelength with deeper dermal penetration. The workhorse for Fitzpatrick II to V with strong epidermal cooling.
Nd:YAG (1064 nm)
Longest wavelength, lowest melanin affinity, safest for Fitzpatrick V and VI and tanned skin.
Peer-reviewed comparisons published in Lasers in Medical Science report diode and alexandrite produce statistically equivalent long-term hair reduction (74 to 84% at 18 months) when used by trained operators, with diode showing a lower side-effect profile in skin types IV and V.
Benefits of Professional Laser Hair Removal
Permanent Reduction
Health Canada and the FDA permit the claim “permanent hair reduction” after a treatment regimen.
No More Ingrowns
Destroys the follicle, ending pseudofolliculitis barbae on bikini, neck, and underarms.
Smoother Texture
Removes razor burn, folliculitis, and post-inflammatory hyperpigmentation.
Time & Cost Savings
Eliminates daily shaving and waxing cycles. Cheaper than waxing over 10 years.
Less Irritation
No ripping of hair shafts, no wax-resin allergies, no broken capillaries.
Confidence
Long-term, low-maintenance smoothness for every body area.
Treatable Body Areas
A clinical-grade laser platform allows safe coverage of nearly every body region: upper lip, chin, sideburns, full face, neck, underarms, chest, abdomen, full back, Brazilian and bikini, full legs, full arms, and feet and toes.
A Single Session, Step by Step
- Pre-treatment shave. The client shaves the area 12 to 24 hours before the appointment so that laser energy targets the follicle, not the surface hair.
- Consultation and Fitzpatrick typing. The technician confirms skin type and recent sun exposure.
- Eyewear. Client and operator wear wavelength-specific safety goggles.
- Test pulse. A low-energy test shot calibrates fluence (J/cm²) and pulse duration.
- Treatment pulses. The handpiece glides across the area with continuous contact cooling. A snapping or warm-rubber-band sensation is normal.
- Post-treatment cooling. Aloe vera gel and zinc oxide SPF 50 are applied.
Underarms take about 10 minutes. Full legs take 45 to 60 minutes. A Brazilian takes 15 to 20 minutes.
Smooth, Stubble-Free Skin
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Why You Need Multiple Sessions: The Hair Growth Cycle
Hair grows in three phases: anagen (growth), catagen (transition), and telogen (rest). Only anagen-phase hairs respond to laser energy. Because each follicle cycles independently, a single session disables only the currently active follicles. A series of 6 to 10 sessions captures successive waves of anagen hairs across the entire treatment field. Maintenance sessions once or twice a year keep hormonally driven regrowth (PCOS, perimenopause) under control.
Pre-Treatment Preparation
- No waxing, threading, or plucking for 4 weeks before treatment. These remove the follicle target.
- Shave 12 to 24 hours before the session.
- No tanning beds, self-tanner, or sun tanning for 2 weeks before treatment.
- Stop retinoids 5 days before the appointment.
- Disclose photosensitizing medications such as doxycycline, isotretinoin, or St. John’s wort.
Aftercare and Side Effect Management
Mild redness and perifollicular edema are normal for 24 to 48 hours. Follow these aftercare rules:
- Apply zinc oxide SPF 30+ on any exposed area for 2 weeks.
- Skip hot showers, saunas, steam rooms, and intense workouts for 24 hours.
- Avoid chlorinated pools and hot tubs for 48 hours.
- Do not exfoliate the treated area for 7 days.
- Expect “shedding” hairs at days 7 to 14, the disabled follicles push out their hair shafts.
Is Laser Hair Removal Safe on Dark Skin?
Yes, with the correct wavelength and operator skill. Diode 810 nm and Nd:YAG 1064 nm are the safest choices for Fitzpatrick IV through VI because longer wavelengths bypass epidermal melanin and target the deeper follicular melanin. Aggressive cooling and lower fluences further protect against post-inflammatory hyperpigmentation.
Laser Hair Removal vs. IPL, Waxing, and Electrolysis
IPL
A broad-spectrum xenon flashlamp, not a true laser. Useful for fair skin with dark hair but less effective on dark skin and coarse hair. Our IPL photofacial treatments are used for rosacea and vascular lesions rather than hair removal.
Waxing
Mechanical avulsion. Hair regrows in 4 to 6 weeks. No permanent reduction.
Electrolysis
Treats one follicle at a time with an electric current. Only modality cleared for “permanent hair removal,” but slow for large areas.
Frequently Asked Questions
Does laser hair removal hurt?
Discomfort is rated 3 to 5 out of 10. The contact-cooled handpiece reduces sensation. Sensitive areas (Brazilian, upper lip) feel sharper than legs or arms.
How many sessions until I see results?
Visible reduction appears after 2 to 3 sessions. The full course is 6 to 10 sessions for 70 to 90% permanent reduction.
Can I shave between sessions?
Yes. Shaving is required. Do not wax, thread, or pluck.
Can I be treated while pregnant?
No. Although there is no documented fetal risk, treatments are deferred during pregnancy because of hormonal hair-growth fluctuations.
Does laser remove white, gray, red, or blond hair?
No. These hairs lack sufficient melanin chromophore. Electrolysis is the only effective option.
What about hormonal hair growth?
Clients with PCOS or perimenopausal hormonal shifts achieve excellent results but require maintenance sessions 2 to 4 times per year.
Are at-home laser devices effective?
Home IPL units deliver a fraction of the energy of a clinical diode laser and rarely produce permanent reduction.
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Sources
- Anderson RR, Parrish JA. “Selective photothermolysis: precise microsurgery by selective absorption of pulsed radiation.” Science, 1983.
- Haedersdal M, Beerwerth F, Nash JF. “Laser and intense pulsed light hair removal technologies.” Lasers in Medical Science.
- U.S. Food & Drug Administration: Laser Hair Removal Facts.
- American Academy of Dermatology: Laser Hair Removal FAQs.
- Health Canada Medical Devices Directorate.